AUCTORES
Globalize your Research
Research Article | DOI: https://doi.org/10.31579/2693-7247/098
1 Mother Teresa College of Pharmacy, Hyderabad, Telangana, India.
2 Omega College of Pharmacy, Hyderabad, Telangana, India.
3 Tou PharmaBio Pvt Ltd, Hyderabad, Telangana, India.
*Corresponding Author: Rajakumar Devara
Citation: Rajakumar Devara, Jithan Aukunuru, Mohammed Habibuddin(2022). Preparation, Characterization and Evaluation of Prasugrel Hydrochloride Nanosuspensions: Its enhancement of dissolution rate and oral bioavailability. J Pharmaceutics and Pharmacology Research, 5(8); DOI:10.31579/2693-7247/098
Copyright: © 2022 Rajakumar Devara. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received: 22 June 2022 | Accepted: 08 July 2022 | Published: 11 July 2022
Keywords: prasugrel hydrochloride, dissolution rate, nanosuspension and bioavailability.
The objective of this study was to investigate nanosuspensions for enhancing the solubility and dissolution rate of Prasugrel HCl (PHCl) so as to reduce the fluctuations in its oral bioavailability. Prasugrel Hydrochloride nanosuspensions were prepared using evaporative precipitation method. After preparation, various nanosuspensions were characterized for particle size, scanning electron microscope (SEM), zeta potential, drug entrapment efficiency (EE), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). Solubility and in-vitro release of the drug from nanoparticles are determined. The formulations were characterized using techniques such as powder x-ray diffractometry, scanning electron microscopy, in-vitro dissolution and in-vivo absorption in rats. The dissolution rate and oral absorption of Prasugrel Hydrochloride in the form of nanosuspensions was significantly higher than that of oral suspension and pure drug. All the techniques investigated in this study can be used to enhance dissolution rate and oral absorption of prasugrel hydrochloride and thus can reduce the fluctuations in its oral bioavailability. Nanosuspensions demonstrated to be better and superior technique when compared to other techniques investigated in enhancing oral bioavailability of Prasugrel Hydrochloride. Prasugrel hydrochloride nanosuspension was successfully developed using and the bioavailability is 4 folds increased than its pure drug.
Prasugrel hydrochloride is a novel member of a third generation thienopyridine class of anti-platelet agents1. It is a prodrug. Formulation strategy for the hydrochloride salt of prasugrel is focused on developing an immediate-release tablet for oral administration. A reaction between Prasugrel Hydrochloride and an excipient was observed late in the development stages during manufacture and storage. This reaction leads to a partial and irreversible formation of prasugrel free base in the tablets. Analysing the samples used for clinical phase-3 study indicated that salt-to base formation of at least up to 70% had no clinical impact and a requirement has been included in the finished product specification2. Its base form had significantly lower bioavailability compared to salt form and its bioavailability is tremendously influenced by the changes in the pH3. Because of these reasons, Prasugrel Hydrochloride rather than its base form was selected for final development and marketing. Solubility determination results and permeability and metabolism information suggest that Prasugrel Hydrochloride is a BCS class-II compound4. Dissolution is affected by pH and decreases with increasing pH. The bioavailability of Prasugrel Hydrochloride exceeds 79%. The peak plasma concentration of the active metabolite occurs 30 minutes after dosing. The parent compound is not detectable in the plasma. Although the oral bioavailability is generally high, it could be variable because of its poor solubility5. Its aqueous solubility is 2.37e-03 g/L. At low pH values from pH 1 to pH 4, it is slightly soluble and above this pH value is it is insoluble6. As Prasugrel Hydrochloride is a poorly soluble compound, many problems are encountered in its systemic delivery and achievement of therapeutic action. One of the critical problems associated with poorly soluble drugs is too low bioavailability and/or erratic absorption. The oral bioavailability/erratic absorption depends, on several factors including aqueous solubility, drug permeability, dissolution rate, first pass metabolism. As a formulator, the problem of poor solublility, especially for BCS-II class compounds, can be successfully solved by enhancing aqueous solubility and dissolution rate.
Various approaches can be attempted to enhance the solubility of poorly soluble Prasugrel Hydrochloride. Different techniques are used to improve the solubility thereby increasing bioavailability of poorly soluble drugs and reducing the erratic absorption7. The approaches include aqueous pH shifted solutions (provided the drug has ionizable groups), micronization, solubilization using co-solvents, solid dispersions, oily solutions, and salt formation. These techniques for solubility enhancement have certain limitations. Excepting for pH shifted solutions, large amounts of excipients are needed to improve the solubility of the drugs using other techniques. A classical solubility approach commonly used is micronization8. In micronization, a coarse drug powder is milled to an ultrafine powder with a mean size being typically in the range of 1-10 µm. The solubility of the drugs is enhanced by increase in the surface area. However, new drugs such as Prasugrel Hydrochloride are so poorly soluble that micronization technique cannot solve the solubility issue. The various other techniques used to enhance the solubility and thereby bioavailability includes: microemulsions, nanoemulsions, liposomes, cyclodextrins. Excepting for addition of cyclodextrins, the other techniques are not practically possible because these formulations are poorly stable and also their manufacture is difficult9. Because of these reasons, there is an urgent need to find an efficient way of enhancing solubility and dissolution rate of poorly soluble drugs such as Prasugrel Hydrochloride. Recent addition to this list includes nanotechnology based nanosuspensions10. Nanotechnology can be used to solve the problems associated with various other approaches described. It is also a practically feasible methodology. Currently nine nanosuspension based formulations are available in US market and all of these formulations are approved by USFDA11. One aim of this study was to prepare Prasugrel Hydrochloride nanosuspensions, cyclodextrin inclusion complexes, SLS drug powders, characterize and evaluate the same for enhancement of dissolution rate and in-vivo absorption in rats. The second aim was to develop IVIVC for the Prasugrel Hydrochloride nanosuspensions that could aid in the further formulation development of nanosuspensions12.
A series of Prasugrel Hydrochloride nanosuspensions were developed altering the two factors: surfactant concentrations and solvent/antisolvent ratio. The oral absorption of Prasugrel Hydrochloride from these formulations was evaluated after a single dose to the rats. Further optimization development of a nano formulation involving alterations in formulation development, preparation process, equipment, batch sizes would require additional animal or human studies. These refinements would delay product development of a nanosuspension. It would be desirable to develop a relationship, referred to as an IVIVC, to predict in-vivo absorption of any refined formulation from in- vitro dissolution test as a surrogate for animal/human testing. Establishment of an in-vitro dissolution test as a surrogate for animal testing/human studies was explored in this study to support PHCl nanosuspension formulation development. Such a development for nanosuspensions was proposed and investigated for the first time 13.
Prasugrel hydrochloride were obtained as a gift sample from Suven Nishtaa. Ethanol, Tween 80 and Sodium lauryl sulphate were obtained from S.D Fine Chemicals Limited. All the other ingredients used were of analytical grade[14].
Preparation of Prasugrel Hydrochloride Nanosuspensions:
Prasugrel Hydrochloride nanosuspensions were prepared by evaporative precipitation method. Ethanol was used as a solvent and tween-80 was used as a surfactant to stabilize the nanosuspension formulation. The drug was dissolved in the solvent (ethanol). The syringe was filled with the prepared solution and injected drop wise into the anti-solvent (water containing tween-80) with constant stirring on a magnetic stirrer. Vacuum was applied while stirring till the solvent evaporates to form the product. Finally the product was filtered and centrifuged at 7000 rpm for 10 min. So as to optimize the nanosuspension formulations prepared, several nanosuspensions were prepared based on different compositions given in Table-1. The two factors: surfactant concentration and solvent-antisolvent ratio were investigated at different levels to study their effect on particle size. Several previous studies indicated that these two factors signficantly affect the particle size of the fabricated nanosuspensions [15,16,17].
Formulation | F1 | F2 | F3 | F4 | F5 |
Prasugrel Hydrochloride (mg) | 100 | 100 | 100 | 100 | 100 |
Distilled water (mL) | 100 | 100 | 100 | 100 | 100 |
Ethanol (mL) | 15 | 10 | 20 | 20 | 20 |
Tween 80 (mL) | 0.2 | 0.2 | 0.1 | 0.3 | 0.2 |
Solvent/antisolvent ratio | 1:6.67 | 1:10 | 1:5 | 1:5 | 1:5 |
Table 1: Composition of Prasugrel Hydrochloride Nanosuspensions
| Formulation | % Drug Encapsulation Efficiency |
| F1 | 83.25 |
| F2 | 92.98 |
| F3 | 79.78 |
| F4 | 89.34 |
| F5 | 88.76 |
Table 2: Drug entrapment efficiency of Prasugrel Hydrochloride Nanosuspensions
| Formulation | Particl Size in (µm) |
| F1 | 0.79 |
| F2 | 0.70 |
| F3 | 1.52 |
| F4 | 0.94 |
| F5 | 1.05 |
Table 3: Particle size determination of Prasugrel Hydrochloride Nanosuspensions by optical microscopy method
Characterization of Various Formulations of Prasugrel Nonosuspensions
Drug-excipient compatibility studies:
FTIR: Fourier Transform Infrared (FTIR) spectroscopy:
FT-IR is used for the drug-excipient compatibility samples of about 5mg was mixed thoroughly with100mg KBr IR powder and compacted under vacuum at a pressure of about 12psi, for 3min. The resultant disc was mounted in a suitable holder in Perkin Elmer IR spectrophotometer and the IR spectrum was recorded from 4000cm-1 to 400cm-1 in a scan time of 12min. these studies were done for Prasugrel Hydrochloride, physical mixture and prasugrel nanosuspension [18].
Characterization of Prasugrel Nanosuspensions:
Percentage yield:
To determine the yield, the weight of microspheres obtained at the end of preparation was determined. The total weight of raw materials used to obtain these microspheres was determined to obtain the theoretical yield.
Percentage yield was then determined using the formula:
Percentage yield = (Practical yield/theoretical yield) x 100
Drug entrapment efficiency:
Drug entrapment efficiency was determined by the dialysis method. Drug entrapment efficiency was calculated for the samples of various prasugrel nanosuspensions. Take a beaker containing 100ml of phosphate buffer medium and keep them on the magnetic stirrer for stirring. 10mg of samples was weighed and taken in a broken test tube containing 10ml of phosphate buffer medium. Bottom end of the test tube was packed with the diffusion membrane. Place the test tube inside the beaker and adjust it such that the test tube is submerged in the beaker containing phosphate buffer medium. Now collect the samples 10 ml from the beaker for every 1hr till 10 hrs and replace it with the fresh medium of buffer.
Entrapment efficiency % = Weight of the drug in nanoparticles x 100%
Weight of the nanoparticles
Particle size:
The mean particle size of nanosuspensions was determined using optical microscope. In this method size of 200 particles was determined by using stage micrometer. The average article size was determined.
Surface morphology
In order to examine the particle surface morphology and shape, scanning electron microscopy (SEM) was used. A concentrated aqueous suspension i.e Prasugrel Hydrochloride nanosuspension was spread over a slab and dried under vacuum. The sample was shadowed in a cathodic evaporator with gold layer 20 nm thick. Photographs were taken using a JSM-5200 Scanning Electron Microscope (Tokyo, Japan) operated at 20 kV [19].
Zeta Potential:
The electrophoretic mobility and zeta potential were measured using a zeta potentiometer (Malvern Zetasizer). To determine the zeta-potential various nanosuspension samples were diluted with KCl (0.1 mm) and placed in the electrophoretic cell where an electric field of 15.2 V/cm was applied. Each sample was analyzed in triplicate.
Solid State stability studies:
Differential scanning calorimetry (DSC):
Differential scanning calorimetry (DSC) is a thermo analytical method used to study thermal transitions involving energy or heat capacity changes. Thermal properties of the powder samples were investigated with differential scanning colorimetry. Approximately 10mg of samples was analyzed in an open aluminum pan and heated at scanning rate of 10oc/min between 0oC and 400oC. Magnesia was used as the standard reference materials. The thermograms of Prasugrel Hydrochloride and for the optimized formula of nanosuspension were determined for solid state stability studies [20].
Powder X-Ray Diffraction (XPRD) analysis:
The drug crystalline state in the polymer sample was evaluated by Powder X-Ray Diffraction (XPRD) analysis. Xray spectra were recorded with X’Pert-PRO multipurpose X-Ray diffractometer (PANalytical, Tokyo, Japan) using Ni-filtered, Cu Ka radiation, a voltage of 45 kV, and a current of 40 mA with a scintillation counter. The instrument was operated in the continuous scanning speed of 4°/min over a 2θ range of 5° to 40°. The samples were grinded using a wedgwood mortar and pestle, placed into the cavity of an aluminum sample holder and packed smoothly using a glass slide. The smallest size nanosuspension was used in the study.
In-vitro drug release studies:
In-vitro drug release experiments were conducted for prasugrel Hydrochloride drug. In-vitro dissolution studies of samples were carried out using USP apparatus-II paddle method by dispersed powder technique. Accurately weighed nanosuspension samples containing 50 mg of drug were added to 500 mL of buffer media at 37 + 0.5°C and stirred at 75 rpm. An aliquot of 10mL was withdrawn at different time intervals. An equal volume of fresh dissolution medium was immediately replaced. The samples withdrawn were filtered by using 0.2µ sterile filter. The amount of drug in the release medium was determined by UV-Visible spectrophotometer. The samples were assayed spectrophotometrically at 254 nm. Citro-phosphate buffer pH 4.0 was used as dissolution medium. This method is based on USFDA recommendations for Prasugrel hydrochloride tablets. The dissolution of nanosuspensions was compared with that of dissolution of equivalent amount of the pure drug. The cumulative amount of drug release over the time period was plotted [21,22].
In vivo Pharmacokinetic Studies in Rats
All the animal studies were conducted as per the guidelines of CPCSEA, India. The protocol was approved by Institutional Animal Ethics Committee of Geetanjali College of Pharmacy, Hyderabad (IAEC No. 1648/PO/a/12/CPCSEA). Wistar rats (weighted 180-220 g) were used as experimental animals. Eighteen rats randomly divided into three groups with six rats in each group. Prior to the experimentation the rats were fasted for 12 h with free access to water. The next day, Prasugrel Hydrochloride drug-complex, Prasugrel Hydrochloride nanosuspensions (F2), Prasugrel Hydrochloride oral suspension prepared using sodium CMC as suspending agent were given to the four groups of rats via the oral route. All the formulations contained 50 mg of drug. About 0.5 mL blood samples were collected via the orbit vein at 0.125, 0.25, 0.5, 1, 2, 3, 4, 6, 8, 10, 12 and 24 hr after administration. The collected blood samples were placed in heparinized tube and then separated immediately by centrifugation at 3000 rpm for 10 min and stored at -20ºC prior to the analysis. The plasma samples were then extracted and the prasugrel was analyzed using a LCMS method as described earlier. The method was validated oer a concentration range of 25-10000 ng/mL. The peak areas of all the metabolites was summed and assumed to be the active drug in the plasma that was absorbed. The plasma concentration time profile for all the batches was determined and plotted using excel [23,24].
Preformulation studies for prasugrel hydrochloride have been performed to know the drugs physicochemical properties so as to design it to a suitable formulation. Prasugrel hydrochloride is a class-II drug classified under BCS classification with low solubility and high permeability. The physicochemical properties were described. Poor solubility leads to poor dissolution, therefore to enhance the dissolution of the drug, different techniques have been employed such as particle size reduction by forming nanosuspensions which is a novel technique. Nanosuspensions of Prasugrel Hydrochloride (F1-F5) were successfully prepared using evaporative precipitation technique. Several batches of nanosuspsensions altering various parameters were prepared at the initial step. The yield and the particle size were used to draw final conclusions for further studies. Subsequently, it was identified that the surfactant levels as well as solvent:antisolvent ratio were found to have a significant influence on the size. Different parameters were thus altered so as to obtain the smallest particle size of the nanosuspensions. The different batches that were prepared for studying the influence of selected parameters is shown in Table-1. Increase in the concentration of surfactant reduced the particle size. The particle size was also reduced as the solvent/antisolvent ratio was decreased. Based on the process development studies, formulation which had the lowest particle size was considered to be the optimized batch. F2 was considered to be the optimized batch. Further studies were conducted using this batch. The particle size is identified by optical microscopy method and size ranges in micron size from 0.70 to 1.05 µm shown in table-2. SEM was used to determine the particle size and surface morphology of optimized nanosuspension of prasugrel htdrochloride F2 from the figure-1 and 2, it was concluded that the average particle size for all formulations was found to be in nano range of 257 nm to 368 nm. Surface morphology and shape were visualized. The particles were appeared as spheres. From this study it has been concluded that size reduction of particle to nanosize results in enhancing dissolution rate of Prasugrel hydrochloride. The zeta potential of optimized nanosuspension was found to be -30.40 ± 0.12 mV, which indicates the nanosuspension is physically stable which can avoid ostwald ripening. The results of percentage drug entrapment efficiency are shown in the table. 3. From the results shown in the table, it can beinferred that there is a proper distribution of prasugrel hydrochloride in the nanosuspensions. The percentage entrapment efficiency was found to be 79.78% to 92.98%. A maximum of 92.98% drug entrapment efficiency was obtained in the F2 formulation with 1:10 solvent:antisolvent ratio. From, XRPD graphs we can conclude that the crystallanity of the drug was changed in the nanosuspensions in figure 3. The peaks obtained for pure drug was very clear and sharp, the intensity of the peaks was very high when compared to peaks of Prasugrel Hydrochloride nanosuspensions. The peak intensity reduction indicates the reduction in the crystallization nature of the drug. In-vitro drug release from the Prasugrel Hydrochloride and Prasugrel Hydrochloride nanosuspensions in citro- phosphate buffer pH 4 was performed by the dissolution experiment using USP dissolution apparatus II. In dissolution studies, it was observed that the dissolution was higher and 4 fold times for nanosuspensions compared to pure drug shown in table 4 and figure 4. At the end of 1 hr, 99.88% of drug was released with nanosuspensions, while this release was only 29.34% with pure drug prasugrel hydrochloride. The in-vivo study in wistar rats was performed to demonstrate in-vivo bioavailability. DSC studies were conducted with drug cyclodextrin complexes. From the overlay of DSC thermograms, it has been observed that prasugrel is in crystalline nature in figure 5. It exhibited a broad exotherm at 134.4°C and peak onset temperature was found at 117.82°C. For cyclodextrin the DSC thermogram exhibits the peak at 150.29°C and peak onset temperature at 107.83°C. This peak was the characteristic peak for cyclodextrins. The thermograms of the complexes prepared using all the three techniques demonstrated characteristic peaks of both PHCl and cyclodextrins. However, the intensity of drug peaks was lower compared to pure drug. In co-evaporation method an additional sharp endotherm peak was found at 197.78°C. This could be because of conversion of PHCl to its base form during the process of complexation. From all the DSC peaks we can conclude that the inclusion complex was formed between the PHCl and HPβCD. It has indicated that the amorphous form of drug prasugrel hydrochloride has been changed to its crystalline form. Second evidence is obtained from FTIR results (spectrums not shown). Pure HPβCD has characteristic IR peaks at 3421 cmˉ1 (H-S moiety), 2436 cmˉ1 (pyridine group), 1757.21cmˉ1(C=O), 1689.70cm-1(C=O), 1492.95cm-1(C-C aromatic stretch), 1232.55cm-1(C-O), 758 cm-1(C-H aromatic ring). Pure HPβCD has characteristic peaks at 3421.83cm-1, 2931.90 cm-1, 1508.38cm-1, 1082.210 cm-1. In physical mixture, kneading and co- evaporation IR graphs both drug and cyclodextrin peaks were seen, however peak intensities were reduced indicating an interaction between two compounds. The results indicate a possible complex formation because of the disappearance of pyrrolidine group in IR spectra. Stretching bands at 1000-1200 cm-1 indicates the presence of ether group(C-O). The intensity of this peak appeared stronger for co-evaporation and kneading methods. Stretching region of hydroxyl group (O-H) appeared at the range of 3600-3200cm-1. Carbonyl group (C=O) appeared at the range of 1650-1620 cm-1. Inclusion complex bands formed by co-evaporation and kneading methods were shifted to higher wave number indicating the formation of complexes. FTIR results suggest the formation of inclusion complexes of PHCl with cyclodextrins with all the three techniques. It indicates that the drug prasugrel hydrochloride is compatible in the formulation. After orally administration of pure drug, oral suspensions and nanosuspensions, the plasma concentrations were obtained and compared in table 5 and figure 6. The plasma concentration profile for nanosuspension represented significant improvement in drug absorption compared with the oral suspension and pure drug prasugrel hydrochloride. The Cmax and area under the curve (AUC) 0-24 h values of nanosuspensions were approximately 4-fold, greater than that of the oral suspension, indicating a remarkable improvement in the oral absorption of prasugrel nanosuspensions. The Cmax was found to be 69.54 μg/mL at 2hr for nanosuspension. The enhancement in oral bioavailability can be attributed to the adhesiveness of the drug nanosuspension, increased surface area due to reduction in particle size, increased saturation solubility, leading to an increased concentration gradient between the gastrointestinal tract lumen and blood, and increased dissolution velocity. The different pharmacokinetic parameters are calculated given in table 6.
Time in min | Pure drug(PHCL) | F1 | F2 | F3 | F4 | F5 |
0 | 0 | 0 | 0 | 0 | 0 | 0 |
5 | 8.45 | 61.63 | 74.25 | 68.32 | 63.25 | 64.64 |
10 | 13.25 | 79.94 | 81.54 | 77.23 | 75.67 | 74.65 |
15 | 16.54 | 88.32 | 95.43 | 85.63 | 83.22 | 82.34 |
30 | 18.67 | 91.23 | 96.18 | 90.12 | 91.53 | 89.79 |
45 | 21.64 | 93.22 | 98.13 | 92.35 | 94.25 | 92.13 |
60 | 29.34 | 95.67 | 99.88 | 94.56 | 96.35 | 94.12 |
Table 4: In-vitro Dissolution profile of Prasugrel Hydrochloride nanosuspensions
Time in hrs | Pure drug μg/mL) | Oral Suspension (μg/mL) | Nanosuspension (μg/mL) |
0 | 0 | 0 | 0 |
0.25 | 0.10 | 3.01 | 16.99 |
0.5 | 2.45 | 6.01 | 22.26 |
0.75 | 4.66 | 8.32 | 32.32 |
1 | 6.12 | 15.11 | 51.01 |
2 | 10.10 | 21.69 | 65.10 |
3 | 9.82 | 18.32 | 48.12 |
4 | 7.32 | 13.21 | 33.33 |
6 | 5.63 | 9.37 | 22.12 |
8 | 4.12 | 6.33 | 17.45 |
10 | 2.31 | 4.03 | 11.23 |
12 | 1.81 | 2.13 | 3.89 |
24 | 1.20 | 0.85 | 0.99 |
Table 5: Plasma drug concentrations of pure drug, oral suspension and Prasugrel nanosuspension:
S.No | Parameter | Value | ||
Pure drug | Suspension | Nanosuspension | ||
1 | AUC | 80.51 μg.hr/mL | 133.07 μg.hr/mL | 347.75 μg.hr/Ml |
2 | K | -0.126/hr | -0.098/hr | -0.095/hr |
3 | t1/2 | 5.51 hrs | 7.06 hrs | 7.24 hrs |
4 | Cmax | 10.12 μg/mL | 23.14 μg/mL | 69.54 μg/Ml |
5 | tmax | 2.1 hrs | 1.98 hrs | 1.59 hrs |
Table 6: Pharmacokinetic parameters of various Prasugrel Hydrochloride formulations
Clearly Auctoresonline and particularly Psychology and Mental Health Care Journal is dedicated to improving health care services for individuals and populations. The editorial boards' ability to efficiently recognize and share the global importance of health literacy with a variety of stakeholders. Auctoresonline publishing platform can be used to facilitate of optimal client-based services and should be added to health care professionals' repertoire of evidence-based health care resources.
Journal of Clinical Cardiology and Cardiovascular Intervention The submission and review process was adequate. However I think that the publication total value should have been enlightened in early fases. Thank you for all.
Journal of Women Health Care and Issues By the present mail, I want to say thank to you and tour colleagues for facilitating my published article. Specially thank you for the peer review process, support from the editorial office. I appreciate positively the quality of your journal.
Journal of Clinical Research and Reports I would be very delighted to submit my testimonial regarding the reviewer board and the editorial office. The reviewer board were accurate and helpful regarding any modifications for my manuscript. And the editorial office were very helpful and supportive in contacting and monitoring with any update and offering help. It was my pleasure to contribute with your promising Journal and I am looking forward for more collaboration.
We would like to thank the Journal of Thoracic Disease and Cardiothoracic Surgery because of the services they provided us for our articles. The peer-review process was done in a very excellent time manner, and the opinions of the reviewers helped us to improve our manuscript further. The editorial office had an outstanding correspondence with us and guided us in many ways. During a hard time of the pandemic that is affecting every one of us tremendously, the editorial office helped us make everything easier for publishing scientific work. Hope for a more scientific relationship with your Journal.
The peer-review process which consisted high quality queries on the paper. I did answer six reviewers’ questions and comments before the paper was accepted. The support from the editorial office is excellent.
Journal of Neuroscience and Neurological Surgery. I had the experience of publishing a research article recently. The whole process was simple from submission to publication. The reviewers made specific and valuable recommendations and corrections that improved the quality of my publication. I strongly recommend this Journal.
Dr. Katarzyna Byczkowska My testimonial covering: "The peer review process is quick and effective. The support from the editorial office is very professional and friendly. Quality of the Clinical Cardiology and Cardiovascular Interventions is scientific and publishes ground-breaking research on cardiology that is useful for other professionals in the field.
Thank you most sincerely, with regard to the support you have given in relation to the reviewing process and the processing of my article entitled "Large Cell Neuroendocrine Carcinoma of The Prostate Gland: A Review and Update" for publication in your esteemed Journal, Journal of Cancer Research and Cellular Therapeutics". The editorial team has been very supportive.
Testimony of Journal of Clinical Otorhinolaryngology: work with your Reviews has been a educational and constructive experience. The editorial office were very helpful and supportive. It was a pleasure to contribute to your Journal.
Dr. Bernard Terkimbi Utoo, I am happy to publish my scientific work in Journal of Women Health Care and Issues (JWHCI). The manuscript submission was seamless and peer review process was top notch. I was amazed that 4 reviewers worked on the manuscript which made it a highly technical, standard and excellent quality paper. I appreciate the format and consideration for the APC as well as the speed of publication. It is my pleasure to continue with this scientific relationship with the esteem JWHCI.
This is an acknowledgment for peer reviewers, editorial board of Journal of Clinical Research and Reports. They show a lot of consideration for us as publishers for our research article “Evaluation of the different factors associated with side effects of COVID-19 vaccination on medical students, Mutah university, Al-Karak, Jordan”, in a very professional and easy way. This journal is one of outstanding medical journal.
Dear Hao Jiang, to Journal of Nutrition and Food Processing We greatly appreciate the efficient, professional and rapid processing of our paper by your team. If there is anything else we should do, please do not hesitate to let us know. On behalf of my co-authors, we would like to express our great appreciation to editor and reviewers.
As an author who has recently published in the journal "Brain and Neurological Disorders". I am delighted to provide a testimonial on the peer review process, editorial office support, and the overall quality of the journal. The peer review process at Brain and Neurological Disorders is rigorous and meticulous, ensuring that only high-quality, evidence-based research is published. The reviewers are experts in their fields, and their comments and suggestions were constructive and helped improve the quality of my manuscript. The review process was timely and efficient, with clear communication from the editorial office at each stage. The support from the editorial office was exceptional throughout the entire process. The editorial staff was responsive, professional, and always willing to help. They provided valuable guidance on formatting, structure, and ethical considerations, making the submission process seamless. Moreover, they kept me informed about the status of my manuscript and provided timely updates, which made the process less stressful. The journal Brain and Neurological Disorders is of the highest quality, with a strong focus on publishing cutting-edge research in the field of neurology. The articles published in this journal are well-researched, rigorously peer-reviewed, and written by experts in the field. The journal maintains high standards, ensuring that readers are provided with the most up-to-date and reliable information on brain and neurological disorders. In conclusion, I had a wonderful experience publishing in Brain and Neurological Disorders. The peer review process was thorough, the editorial office provided exceptional support, and the journal's quality is second to none. I would highly recommend this journal to any researcher working in the field of neurology and brain disorders.
Dear Agrippa Hilda, Journal of Neuroscience and Neurological Surgery, Editorial Coordinator, I trust this message finds you well. I want to extend my appreciation for considering my article for publication in your esteemed journal. I am pleased to provide a testimonial regarding the peer review process and the support received from your editorial office. The peer review process for my paper was carried out in a highly professional and thorough manner. The feedback and comments provided by the authors were constructive and very useful in improving the quality of the manuscript. This rigorous assessment process undoubtedly contributes to the high standards maintained by your journal.
International Journal of Clinical Case Reports and Reviews. I strongly recommend to consider submitting your work to this high-quality journal. The support and availability of the Editorial staff is outstanding and the review process was both efficient and rigorous.
Thank you very much for publishing my Research Article titled “Comparing Treatment Outcome Of Allergic Rhinitis Patients After Using Fluticasone Nasal Spray And Nasal Douching" in the Journal of Clinical Otorhinolaryngology. As Medical Professionals we are immensely benefited from study of various informative Articles and Papers published in this high quality Journal. I look forward to enriching my knowledge by regular study of the Journal and contribute my future work in the field of ENT through the Journal for use by the medical fraternity. The support from the Editorial office was excellent and very prompt. I also welcome the comments received from the readers of my Research Article.
Dear Erica Kelsey, Editorial Coordinator of Cancer Research and Cellular Therapeutics Our team is very satisfied with the processing of our paper by your journal. That was fast, efficient, rigorous, but without unnecessary complications. We appreciated the very short time between the submission of the paper and its publication on line on your site.
I am very glad to say that the peer review process is very successful and fast and support from the Editorial Office. Therefore, I would like to continue our scientific relationship for a long time. And I especially thank you for your kindly attention towards my article. Have a good day!
"We recently published an article entitled “Influence of beta-Cyclodextrins upon the Degradation of Carbofuran Derivatives under Alkaline Conditions" in the Journal of “Pesticides and Biofertilizers” to show that the cyclodextrins protect the carbamates increasing their half-life time in the presence of basic conditions This will be very helpful to understand carbofuran behaviour in the analytical, agro-environmental and food areas. We greatly appreciated the interaction with the editor and the editorial team; we were particularly well accompanied during the course of the revision process, since all various steps towards publication were short and without delay".
I would like to express my gratitude towards you process of article review and submission. I found this to be very fair and expedient. Your follow up has been excellent. I have many publications in national and international journal and your process has been one of the best so far. Keep up the great work.
We are grateful for this opportunity to provide a glowing recommendation to the Journal of Psychiatry and Psychotherapy. We found that the editorial team were very supportive, helpful, kept us abreast of timelines and over all very professional in nature. The peer review process was rigorous, efficient and constructive that really enhanced our article submission. The experience with this journal remains one of our best ever and we look forward to providing future submissions in the near future.
I am very pleased to serve as EBM of the journal, I hope many years of my experience in stem cells can help the journal from one way or another. As we know, stem cells hold great potential for regenerative medicine, which are mostly used to promote the repair response of diseased, dysfunctional or injured tissue using stem cells or their derivatives. I think Stem Cell Research and Therapeutics International is a great platform to publish and share the understanding towards the biology and translational or clinical application of stem cells.
I would like to give my testimony in the support I have got by the peer review process and to support the editorial office where they were of asset to support young author like me to be encouraged to publish their work in your respected journal and globalize and share knowledge across the globe. I really give my great gratitude to your journal and the peer review including the editorial office.
I am delighted to publish our manuscript entitled "A Perspective on Cocaine Induced Stroke - Its Mechanisms and Management" in the Journal of Neuroscience and Neurological Surgery. The peer review process, support from the editorial office, and quality of the journal are excellent. The manuscripts published are of high quality and of excellent scientific value. I recommend this journal very much to colleagues.
Dr.Tania Muñoz, My experience as researcher and author of a review article in The Journal Clinical Cardiology and Interventions has been very enriching and stimulating. The editorial team is excellent, performs its work with absolute responsibility and delivery. They are proactive, dynamic and receptive to all proposals. Supporting at all times the vast universe of authors who choose them as an option for publication. The team of review specialists, members of the editorial board, are brilliant professionals, with remarkable performance in medical research and scientific methodology. Together they form a frontline team that consolidates the JCCI as a magnificent option for the publication and review of high-level medical articles and broad collective interest. I am honored to be able to share my review article and open to receive all your comments.
“The peer review process of JPMHC is quick and effective. Authors are benefited by good and professional reviewers with huge experience in the field of psychology and mental health. The support from the editorial office is very professional. People to contact to are friendly and happy to help and assist any query authors might have. Quality of the Journal is scientific and publishes ground-breaking research on mental health that is useful for other professionals in the field”.
Dear editorial department: On behalf of our team, I hereby certify the reliability and superiority of the International Journal of Clinical Case Reports and Reviews in the peer review process, editorial support, and journal quality. Firstly, the peer review process of the International Journal of Clinical Case Reports and Reviews is rigorous, fair, transparent, fast, and of high quality. The editorial department invites experts from relevant fields as anonymous reviewers to review all submitted manuscripts. These experts have rich academic backgrounds and experience, and can accurately evaluate the academic quality, originality, and suitability of manuscripts. The editorial department is committed to ensuring the rigor of the peer review process, while also making every effort to ensure a fast review cycle to meet the needs of authors and the academic community. Secondly, the editorial team of the International Journal of Clinical Case Reports and Reviews is composed of a group of senior scholars and professionals with rich experience and professional knowledge in related fields. The editorial department is committed to assisting authors in improving their manuscripts, ensuring their academic accuracy, clarity, and completeness. Editors actively collaborate with authors, providing useful suggestions and feedback to promote the improvement and development of the manuscript. We believe that the support of the editorial department is one of the key factors in ensuring the quality of the journal. Finally, the International Journal of Clinical Case Reports and Reviews is renowned for its high- quality articles and strict academic standards. The editorial department is committed to publishing innovative and academically valuable research results to promote the development and progress of related fields. The International Journal of Clinical Case Reports and Reviews is reasonably priced and ensures excellent service and quality ratio, allowing authors to obtain high-level academic publishing opportunities in an affordable manner. I hereby solemnly declare that the International Journal of Clinical Case Reports and Reviews has a high level of credibility and superiority in terms of peer review process, editorial support, reasonable fees, and journal quality. Sincerely, Rui Tao.
Clinical Cardiology and Cardiovascular Interventions I testity the covering of the peer review process, support from the editorial office, and quality of the journal.
Clinical Cardiology and Cardiovascular Interventions, we deeply appreciate the interest shown in our work and its publication. It has been a true pleasure to collaborate with you. The peer review process, as well as the support provided by the editorial office, have been exceptional, and the quality of the journal is very high, which was a determining factor in our decision to publish with you.
The peer reviewers process is quick and effective, the supports from editorial office is excellent, the quality of journal is high. I would like to collabroate with Internatioanl journal of Clinical Case Reports and Reviews journal clinically in the future time.
Clinical Cardiology and Cardiovascular Interventions, I would like to express my sincerest gratitude for the trust placed in our team for the publication in your journal. It has been a true pleasure to collaborate with you on this project. I am pleased to inform you that both the peer review process and the attention from the editorial coordination have been excellent. Your team has worked with dedication and professionalism to ensure that your publication meets the highest standards of quality. We are confident that this collaboration will result in mutual success, and we are eager to see the fruits of this shared effort.
Dear Dr. Jessica Magne, Editorial Coordinator 0f Clinical Cardiology and Cardiovascular Interventions, I hope this message finds you well. I want to express my utmost gratitude for your excellent work and for the dedication and speed in the publication process of my article titled "Navigating Innovation: Qualitative Insights on Using Technology for Health Education in Acute Coronary Syndrome Patients." I am very satisfied with the peer review process, the support from the editorial office, and the quality of the journal. I hope we can maintain our scientific relationship in the long term.
Dear Monica Gissare, - Editorial Coordinator of Nutrition and Food Processing. ¨My testimony with you is truly professional, with a positive response regarding the follow-up of the article and its review, you took into account my qualities and the importance of the topic¨.
Dear Dr. Jessica Magne, Editorial Coordinator 0f Clinical Cardiology and Cardiovascular Interventions, The review process for the article “The Handling of Anti-aggregants and Anticoagulants in the Oncologic Heart Patient Submitted to Surgery” was extremely rigorous and detailed. From the initial submission to the final acceptance, the editorial team at the “Journal of Clinical Cardiology and Cardiovascular Interventions” demonstrated a high level of professionalism and dedication. The reviewers provided constructive and detailed feedback, which was essential for improving the quality of our work. Communication was always clear and efficient, ensuring that all our questions were promptly addressed. The quality of the “Journal of Clinical Cardiology and Cardiovascular Interventions” is undeniable. It is a peer-reviewed, open-access publication dedicated exclusively to disseminating high-quality research in the field of clinical cardiology and cardiovascular interventions. The journal's impact factor is currently under evaluation, and it is indexed in reputable databases, which further reinforces its credibility and relevance in the scientific field. I highly recommend this journal to researchers looking for a reputable platform to publish their studies.
Dear Editorial Coordinator of the Journal of Nutrition and Food Processing! "I would like to thank the Journal of Nutrition and Food Processing for including and publishing my article. The peer review process was very quick, movement and precise. The Editorial Board has done an extremely conscientious job with much help, valuable comments and advices. I find the journal very valuable from a professional point of view, thank you very much for allowing me to be part of it and I would like to participate in the future!”
Dealing with The Journal of Neurology and Neurological Surgery was very smooth and comprehensive. The office staff took time to address my needs and the response from editors and the office was prompt and fair. I certainly hope to publish with this journal again.Their professionalism is apparent and more than satisfactory. Susan Weiner
My Testimonial Covering as fellowing: Lin-Show Chin. The peer reviewers process is quick and effective, the supports from editorial office is excellent, the quality of journal is high. I would like to collabroate with Internatioanl journal of Clinical Case Reports and Reviews.
My experience publishing in Psychology and Mental Health Care was exceptional. The peer review process was rigorous and constructive, with reviewers providing valuable insights that helped enhance the quality of our work. The editorial team was highly supportive and responsive, making the submission process smooth and efficient. The journal's commitment to high standards and academic rigor makes it a respected platform for quality research. I am grateful for the opportunity to publish in such a reputable journal.
My experience publishing in International Journal of Clinical Case Reports and Reviews was exceptional. I Come forth to Provide a Testimonial Covering the Peer Review Process and the editorial office for the Professional and Impartial Evaluation of the Manuscript.
