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Mora-Castaño G, Domínguez-Robles J, Himawan A, Millán-Jiménez M, Caraballo I. Current trends in 3D printed gastroretentive floating drug delivery systems: A comprehensive review. Int J Pharm 2024:124543. [PMID: 39094921 DOI: 10.1016/j.ijpharm.2024.124543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 07/19/2024] [Accepted: 07/29/2024] [Indexed: 08/04/2024]
Abstract
Gastrointestinal (GI) environment is influenced by several factors (gender, genetics, sex, disease state, food) leading to oral drug absorption variability or to low bioavailability. In this scenario, gastroretentive drug delivery systems (GRDDS) have been developed in order to solve absorption problems, to lead to a more effective local therapy or to allow sustained drug release during a longer time period than the typical oral sustained release dosage forms. Among all GRDDS, floating systems seem to provide a promising and practical approach for achieving a long intra-gastric residence time and sustained release profile. In the last years, a novel technique is being used to manufacture this kind of systems: three-dimensional (3D) printing technology. This technique provides a versatile and easy process to manufacture personalized drug delivery systems. This work presents a systematic review of the main 3D printing based designs proposed up to date to manufacture floating systems. We have also summarized the most important parameters involved in buoyancy and sustained release of the systems, in order to facilitate the scale up of this technology to industrial level. Finally, a section discussing about the influence of materials in drug release, their biocompatibility and safety considerations have been included.
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Affiliation(s)
- Gloria Mora-Castaño
- Department of Pharmacy and Pharmaceutical Technology, Universidad de Sevilla, C/Profesor García González 2, 41012 Seville, Spain
| | - Juan Domínguez-Robles
- Department of Pharmacy and Pharmaceutical Technology, Universidad de Sevilla, C/Profesor García González 2, 41012 Seville, Spain
| | - Achmad Himawan
- Faculty of Pharmacy, Hasanuddin University, Makassar 90245, Indonesia; School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, United Kingdom
| | - Mónica Millán-Jiménez
- Department of Pharmacy and Pharmaceutical Technology, Universidad de Sevilla, C/Profesor García González 2, 41012 Seville, Spain.
| | - Isidoro Caraballo
- Department of Pharmacy and Pharmaceutical Technology, Universidad de Sevilla, C/Profesor García González 2, 41012 Seville, Spain
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Alqahtani AA, Mohammed AA, Fatima F, Ahmed MM. Fused Deposition Modelling 3D-Printed Gastro-Retentive Floating Device for Propranolol Hcl Tablets. Polymers (Basel) 2023; 15:3554. [PMID: 37688178 PMCID: PMC10490505 DOI: 10.3390/polym15173554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/09/2023] [Accepted: 08/23/2023] [Indexed: 09/10/2023] Open
Abstract
Three-dimensional printing has revolutionized drug manufacturing and has provided a solution to the limitations associated with the conventional manufacturing method by designing complex drug delivery systems with customized drug release profiles for personalized therapies. The present investigation aims to design a gastric floating tablet with prolonged gastric floating time and sustained drug release profile. In the present study, a gastro retentive floating device (GRFD) was designed and fabricated using a fused deposition modelling (FDM)-based 3D printing technique. This device acts as a multifunctional dosage form exhibiting prolonged gastric retention time and sustained drug release profile with improved oral bioavailability in the upper gastrointestinal tract. Commercial polyvinyl alcohol (PVA) and polylactic acid (PLA) filaments were used to design GRFD, which was comprised of dual compartments. The outer sealed compartment acts as an air-filled chamber that imparts buoyancy to the device and the inner compartment is filled with a commercial propranolol hydrochloride immediate-release tablet. The device is designed as a round-shaped shell with a central opening of varying size (1 mm, 2 mm, 3 mm, and 4 mm), which acts as a drug release window. Scanning electron microscope (SEM) images were used to determine morphological characterization. The in vitro buoyancy and drug release were evaluated using the USP type II dissolution apparatus. All the designed GRFDs exhibit good floating ability and sustained drug release profiles. GRFDs fabricated using PLA filament show maximum buoyancy (>24 h) and sustained drug release for up to 10 h. The floating ability and drug release from the developed devices were governed by the drug release window opening size and the filament material affinity towards the gastric fluid. The designed GRFDs show great prospects in modifying the drug release characteristics and could be applied to any conventional immediate-release product.
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Affiliation(s)
- Abdulsalam A. Alqahtani
- Department of Pharmaceutics, College of Pharmacy, Najran University, Najran 11001, Saudi Arabia
| | - Abdul Aleem Mohammed
- Department of Pharmaceutics, College of Pharmacy, Najran University, Najran 11001, Saudi Arabia
| | - Farhat Fatima
- Department of Pharmaceutics, College of Pharmacy, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
| | - Mohammed Muqtader Ahmed
- Department of Pharmaceutics, College of Pharmacy, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
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Sikandar M, Shoaib MH, Yousuf RI, Ahmed FR, Ali FR, Saleem MT, Ahmed K, Sarfaraz S, Jabeen S, Siddiqui F, Husain T, Qazi F, Imtiaz MS. Nanoclay-Based Composite Films for Transdermal Drug Delivery: Development, Characterization, and in silico Modeling and Simulation. Int J Nanomedicine 2022; 17:3463-3481. [PMID: 35959283 PMCID: PMC9359522 DOI: 10.2147/ijn.s367540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 07/24/2022] [Indexed: 11/26/2022] Open
Abstract
Purpose Halloysite nanotubes (HNTs) are a versatile and highly investigated clay mineral due to their natural availability, low cost, strong mechanical strength, biocompatibility, and binding properties. The present work explores its role for retarding and controlling the drug release from the composite polymer matrix material. Methods For this purpose, nanocomposite films comprising propranolol HCl and different concentrations of HNTs were formulated using the “solution casting method”. The menthol in a concentration of 1% w/v was used as a permeation enhancer, and its effect on release and permeation was also determined. Quality characteristics of the nanocomposite were determined, and in vitro release and permeation studies were performed using the Franz diffusion system. The data was analyzed using various mathematical models and permeation parameters. Optimized formulation was also subjected to skin irritation test, FTIR, DSC, and SEM study. Systemic absorption and disposition of propranolol HCl from the nanocomposites were predicted using the GastroPlus TCAT® model. Results The control in drug release rate was associated with the higher concentration of HNTs. F8 released 50% of propranolol within 8 hours (drug, HNTs ratio, 1:2). The optimized formulation (F6) with drug: HNTs (2:1), exhibited drug release 80% in 4 hours, with maximum flux of 145.812 µg/cm2hr. The optimized formulation was found to be a non-irritant for skin with a shelf life of 35.46 months (28–30 ℃). The in silico model predicted Cmax, Tmax, AUCt, and AUCinf as 32.113 ng/mL, 16.58 h, 942.34 ng/mL×h, and 1102.9 ng/mL×h, respectively. Conclusion The study demonstrated that HNTs could be effectively used as rate controlling agent in matrix type transdermal formulations.
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Affiliation(s)
- Muhammad Sikandar
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Muhammad Harris Shoaib
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
- Correspondence: Muhammad Harris Shoaib, Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan, Email ;
| | - Rabia Ismail Yousuf
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Farrukh Rafiq Ahmed
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Fatima Ramzan Ali
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
- Jinnah College of Pharmacy, Sohail University, Karachi, 74000, Pakistan
| | - Muhammad Talha Saleem
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Kamran Ahmed
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Sana Sarfaraz
- Department of Pharmacology, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Sabahat Jabeen
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Fahad Siddiqui
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Tazeen Husain
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Faaiza Qazi
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Muhammad Suleman Imtiaz
- Department of Pharmaceutics, Faculty of Pharmacy and Pharmaceutical Sciences, University of Karachi, Karachi, 75270, Pakistan
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Samala ML, Janga RB. Design, statistical optimization of Nizatidine floating tablets using natural polymer. FUTURE JOURNAL OF PHARMACEUTICAL SCIENCES 2021. [DOI: 10.1186/s43094-020-00140-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
The present research was aimed in developing gastroretentive tablets of Nizatidine, in order to increase the bioavailability of the drug. Nizatidine belongs to BCS class 3 and thus formulating into gastroretentive tablets helps to achieve a better therapeutic effect. There were no reports available on the use of Mimosa gum in the design of gastroretentive drug delivery systems. Response surface methodology was employed to optimize the formulation with suitable experimental design. The goal of the response surface methodology was to obtain a regression model and to find a suitable approximation for the true functional relationship between the response and the set of independent variables. Hence, the statistical approach like full factorial design was utilized to obtain optimized formulation with a smaller number of experiments.
Results
DSC study justified no interaction of the drug with excipients. The floating lag time was observed to be less than 20 s, total floating time was in the range of 8–24 h, hardness ranges from 4 to 5 kg/cm2, and friability was less than 1%. Dissolution data indicated that the higher viscosity of Mimosa (2%) delayed the drug release for extended period of time up to 23 h when compared to lower viscosity Mimosa (1%), which controlled the release of the drug up to 12 h only. The ‘n’ values of all the prepared formulations were found to be 0.59 to 0.81 indicating that the release mechanism followed anomalous (non-Fickian) diffusion. The optimal values of independent test variables were obtained from the overlay plots. The optimized formulation of Mimosa gum (2%) (M2%opt) contained 170 mg of polymer and 25.5 mg (15%) of sodium bicarbonate. Similarly, the optimized formulation of Mimosa (1%) (M1%opt) contained 255 mg of polymer and 34 mg (10%) of sodium bicarbonate.
Conclusion
The results clearly indicated that the optimized formulations followed zero-order release kinetics with diffusion mechanism as per the predicted theoretical release rate confirming the suitability of the predicted theoretical release profile.
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Kurćubić I, Vajić UJ, Cvijić S, Crevar-Sakač M, Bogavac-Stanojević N, Miloradović Z, Mihajlović-Stanojević N, Ivanov M, Karanović D, Jovović Đ, Djuriš J. Mucoadhesive buccal tablets with propranolol hydrochloride: Formulation development and in vivo performances in experimental essential hypertension. Int J Pharm 2021; 610:121266. [PMID: 34752918 DOI: 10.1016/j.ijpharm.2021.121266] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 10/30/2021] [Accepted: 11/01/2021] [Indexed: 11/28/2022]
Abstract
The objective of this study was to formulate extended-release mucoadhesive buccal tablets of propranolol hydrochloride in order to provide a prolonged absorption of propranolol hydrochloride from the buccal mucosa and to reduce presystemic metabolism and thus provide a better therapeutic effect. Besides, the aim was to perform comparative in vivo pharmacokinetic and hemodynamic studies of the developed extended-release (ER) propranolol hydrochloride 10 mg mucoadhesive buccal tablets and commercial immediate-release (IR) propranolol hydrochloride 10 mg tablets in spontaneously hypertensive rats. Formulation with 15% polyethylene oxide showed the highest degree of propranolol hydrochloride permeation, satisfactory mucoadhesiveness, and extended-release of propranolol hydrochloride, thus it was selected for further in vivo study. The pharmacokinetic study in rats showed the superiority of ER mucoadhesive buccal tablets over IR tablets in terms of propranolol hydrochloride absorption extent (AUC values: 70.32 ± 19.56 versus 31.69 ± 6.97 µg·h/mL), although lower maximum plasma propranolol hydrochloride concentration (Cmax) was achieved. However, no statistically significant difference was observed in Cmax between these treatments. The hemodynamic study showed that ER mucoadhesive buccal tablets provide a more pronounced decrease primarily in heart rate, but also in systolic and diastolic arterial pressure, as well as a longer heart rate reduction compared to IR tablets.
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Affiliation(s)
- Ivana Kurćubić
- Department of Pharmaceutical Technology and Cosmetology, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia.
| | - Una-Jovana Vajić
- University of Belgrade, Institute for Medical Research, National Institute of Republic of Serbia, Dr Subotića 4, 11000 Belgrade, Serbia
| | - Sandra Cvijić
- Department of Pharmaceutical Technology and Cosmetology, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Milkica Crevar-Sakač
- Department of Pharmaceutical Technology and Cosmetology, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Nataša Bogavac-Stanojević
- Department of Pharmaceutical Technology and Cosmetology, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Zoran Miloradović
- University of Belgrade, Institute for Medical Research, National Institute of Republic of Serbia, Dr Subotića 4, 11000 Belgrade, Serbia
| | - Nevena Mihajlović-Stanojević
- University of Belgrade, Institute for Medical Research, National Institute of Republic of Serbia, Dr Subotića 4, 11000 Belgrade, Serbia
| | - Milan Ivanov
- University of Belgrade, Institute for Medical Research, National Institute of Republic of Serbia, Dr Subotića 4, 11000 Belgrade, Serbia
| | - Danijela Karanović
- University of Belgrade, Institute for Medical Research, National Institute of Republic of Serbia, Dr Subotića 4, 11000 Belgrade, Serbia
| | - Đurđica Jovović
- University of Belgrade, Institute for Medical Research, National Institute of Republic of Serbia, Dr Subotića 4, 11000 Belgrade, Serbia
| | - Jelena Djuriš
- Department of Pharmaceutical Technology and Cosmetology, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia
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Rahamathulla M, Saisivam S, Alshetaili A, Hani U, Gangadharappa HV, Alshehri S, Ghoneim MM, Shakeel F. Design and Evaluation of Losartan Potassium Effervescent Floating Matrix Tablets: In Vivo X-ray Imaging and Pharmacokinetic Studies in Albino Rabbits. Polymers (Basel) 2021; 13:3476. [PMID: 34685235 PMCID: PMC8538939 DOI: 10.3390/polym13203476] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 10/06/2021] [Accepted: 10/07/2021] [Indexed: 02/07/2023] Open
Abstract
Losartan potassium (LP) is an angiotensin receptor blocker used to treat hypertension. At higher pH, it shows poor aqueous solubility, which leads to poor bioavailability and lowers its therapeutic effectiveness. The main aim of this research was to develop a direct compressed effervescent floating matrix tablet (EFMT) of LP using hydroxyl propyl methylcellulose 90SH 15,000 (HPMC-90SH 15,000), karaya gum (KG), and an effervescent agent, such as sodium bicarbonate (SB). Therefore, an EFMT has been developed to prolong the stomach residence time (GRT) of a drug to several hours and improve its bioavailability in the stomach region. The blended powder was evaluated for pre-compression characteristics, followed by post-compression characteristics, in vitro floating, water uptake studies, and in vitro studies. The optimized formulation of EFMT was investigated for in vivo buoyancy by X-ray imaging and pharmacokinetic studies in Albino rabbits. The results revealed that the parameters of pre- and post-compression were within the USP limits. All tablets showed good floating capabilities (short floating lag time <1 min and floated for >24 h), good swelling characteristics, and controlled release for over 24 h. The Fourier-transform infrared (FTIR) and differential scanning calorimetry (DSC) spectra showed drug-polymer compatibility. The optimized formulation F3 (HPMC-90SH 15,000-KG) exhibited non-Fickian diffusion and showed 100% drug release at the end of 24 h. In addition, with the optimized formulation F3, we observed that the EFMT floated continuously in the rabbit's stomach area; thus, the GRT could be extended to more than 12 h. The pharmacokinetic profiling in Albino rabbits revealed that the relative bioavailability of the optimized LP-EFMT was enhanced compared to an oral solution of LP. We conclude that this a potential method for improving the oral bioavailability of LP to treat hypertension effectively.
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Affiliation(s)
- Mohamed Rahamathulla
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Abha 61421, Saudi Arabia;
| | - Srinivasan Saisivam
- Department of Pharmaceutics, N.R. Vikaria Institute of Pharmacy, Junegad 362001, Gujrat, India;
| | - Abdullah Alshetaili
- Department of Pharmaceutics, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia;
| | - Umme Hani
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Abha 61421, Saudi Arabia;
| | | | - Sultan Alshehri
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; (S.A.); (F.S.)
| | - Mohammed M. Ghoneim
- Department of Pharmacy Practice, College of Pharmacy, AlMaarefa University, Ad Diriyah 13713, Saudi Arabia;
| | - Faiyaz Shakeel
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; (S.A.); (F.S.)
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Formulation of Tablets in Capsule system: Statistical optimization for chronotherapeutic drug delivery of propranolol hydrochloride. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2021.102398] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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陈 迪, 徐 翔, 汪 明, 李 芮, 臧 根, 张 悦, 钱 浩, 闫 光, 范 田. [Preparation and in vitro evaluation of fused deposition modeling 3D printed verapa-mil hydrochloride gastric floating formulations]. BEIJING DA XUE XUE BAO. YI XUE BAN = JOURNAL OF PEKING UNIVERSITY. HEALTH SCIENCES 2021; 53:348-354. [PMID: 33879910 PMCID: PMC8072436 DOI: 10.19723/j.issn.1671-167x.2021.02.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Indexed: 06/12/2023]
Abstract
OBJECTIVE To explore the feasibility of preparing gastric floating formulations by fused de-position modeling (FDM) 3D printing technology, to evaluate the in vitro properties of the prepared FDM 3D printed gastric floating formulations, and to compare the influence of different external shapes of the formulation with their in vitro properties. METHODS Verapamil hydrochloride and polyvinyl alcohol (PVA) were used as the model drug and the excipient, respectively. The capsule-shaped and hemisphere-shaped gastric floating formulations were then prepared by FDM 3D printing. The infill percentages were 15%, the layer heights were 0.2 mm, and the roof or floor thicknesses were 0.8 mm for both the 3D printed formulations, while the number of shells was 3 and 4 for capsule-shaped and hemisphere-shaped formulation, respectively. Scanning electron microscopy (SEM) was used to observe the morpho-logy of the surface and cross section of the formulations. Gravimetric method was adopted to measure the weights of the formulations. Texture analyzer was employed to evaluate the hardness of the formulations. High performance liquid chromatography method was used to determine the drug contents of the formulations. The in vitro floating and drug release behavior of the formulations were also characterized. RESULTS SEM showed that the appearance of the FDM 3D printed gastric floating formulations were both intact and free from defects with the filling structure which was consistent with the design. The weight variations of the two formulations were relatively low, indicating a high reproducibility of the 3D printing fabrication. Above 800.0 N of hardness was obtained in two mutually perpendicular directions for the two formulations. The drug contents of the two formulations approached to 100%, showing no drug loss during the 3D printing process. The two formulations floated in vitro without any lag time, and the in vitro floating time of the capsule-shaped and hemisphere-shaped formulation were (3.97±0.41) h and (4.48±0.21) h, respectively. The in vitro release of the two formulations was significantly slower than that of the commercially available immediate-release tablets. CONCLUSION The capsule-shaped and hemisphere-shaped verapamil hydrochloride gastric floating formulations were prepared by FDM 3D printing technology successfully. Only the floating time was found to be influenced by the external shape of the 3D printed formulations in this study.
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Affiliation(s)
- 迪 陈
- 北京大学药学院药剂学系, 北京大学药学院分子药剂学与新释药系统北京市重点实验室, 北京 100191Department of Pharmaceutics, Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, Peking University School of Pharmaceutical Sciences, Beijing 100191, China
| | - 翔宇 徐
- 北京航空航天大学机械工程及自动化学院, 北京 100191School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
| | - 明睿 汪
- 北京大学药学院药剂学系, 北京大学药学院分子药剂学与新释药系统北京市重点实验室, 北京 100191Department of Pharmaceutics, Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, Peking University School of Pharmaceutical Sciences, Beijing 100191, China
| | - 芮 李
- 北京大学药学院药剂学系, 北京大学药学院分子药剂学与新释药系统北京市重点实验室, 北京 100191Department of Pharmaceutics, Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, Peking University School of Pharmaceutical Sciences, Beijing 100191, China
| | - 根奥 臧
- 北京航空航天大学机械工程及自动化学院, 北京 100191School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
| | - 悦 张
- 北京大学药学院药剂学系, 北京大学药学院分子药剂学与新释药系统北京市重点实验室, 北京 100191Department of Pharmaceutics, Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, Peking University School of Pharmaceutical Sciences, Beijing 100191, China
| | - 浩楠 钱
- 北京大学药学院药剂学系, 北京大学药学院分子药剂学与新释药系统北京市重点实验室, 北京 100191Department of Pharmaceutics, Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, Peking University School of Pharmaceutical Sciences, Beijing 100191, China
| | - 光荣 闫
- 北京航空航天大学机械工程及自动化学院, 北京 100191School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
| | - 田园 范
- 北京大学药学院药剂学系, 北京大学药学院分子药剂学与新释药系统北京市重点实验室, 北京 100191Department of Pharmaceutics, Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, Peking University School of Pharmaceutical Sciences, Beijing 100191, China
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Wook Huh H, Na YG, Kang H, Kim M, Han M, Mai Anh Pham T, Lee H, Baek JS, Lee HK, Cho CW. Novel self-floating tablet for enhanced oral bioavailability of metformin based on cellulose. Int J Pharm 2021; 592:120113. [PMID: 33246050 DOI: 10.1016/j.ijpharm.2020.120113] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 11/02/2020] [Accepted: 11/20/2020] [Indexed: 12/25/2022]
Abstract
Metformin has several problems such as low bioavailability, short half-life, and narrow absorption window, sustained and site-specific drug delivery system is required. Floating drug delivery systems are very useful to achieve these purposes. However, conventional floating systems have several limitations; lag time, a high proportion of excipient in the tablet, using non-biocompatible excipient, and requirement of a complicated procedure. To overcome these obstacles, we developed a hollow-core floating tablet (HCFT). The HCFT immediately floated in pH 1.2, 4.0, 6.8 medium, and even distilled water. The floating duration time of HCFT was>24 h. From the in vitro release study, it was confirmed that HCFT showed the sustain release profile of metformin for 12 h. Water uptake and matrix erosion were evaluated for predicting the buoyancy and drug release kinetics of HCFT in the body. Factor analysis was applied to optimize the formulation. There were significant (p < 0.05) differences in metformin plasma concentration of 4 h and 6 h between two groups. Compared with Glucophage® XR, the relative bioavailability of metformin HCFT was 123.81 ± 3.52%. The X-ray imaging of optimized formulation revealed that HCFT was constantly floating in the stomach region of the rabbit, thereby indicating improved gastric retention for>6 h. Consequently, all the findings indicate that HCFT could be an effective gastric retention system and applied extensively to other drugs with narrow absorption windows.
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Affiliation(s)
- Hyun Wook Huh
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Young-Guk Na
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - HeeChol Kang
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Minki Kim
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Mingu Han
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Thi Mai Anh Pham
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Hyeonmin Lee
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Jong-Suep Baek
- Department of Bio-Health Convergence, Kangwon National Univerisity, Chucheon, Gangwon-do 25949, Republic of Korea.
| | - Hong-Ki Lee
- Animal Model Research Group, Jeonbuk Branch, Korea Institute of Toxicology (KIT), Jeongeup, Jeollabuk-do 53212, Republic of Korea.
| | - Cheong-Weon Cho
- College of Pharmacy and Institute of Drug Research and Development, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea.
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10
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Singh MP, Kumar M, Shankar R. Development and Optimization of Methscopolamine Bromide Gastroretentive Floating Tablets Using 32 Factorial Design. Drug Res (Stuttg) 2020; 70:576-582. [PMID: 32992345 DOI: 10.1055/a-1249-8186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE The aim of this study was to formulate methscopolamine floating drug delivery system to increase its gastro retention for further enhancement of absorption and overall bioavailability. METHOD Direct compression method was used to formulate floating drug delivery system of methscopolamine bromide.: Different amount of HPMC, PVP K25, and MCC were used for preparation of tablets. RESULT The prepared tablets were evaluated for thickness, hardness, weight variation, floating lag time, swelling index and in-vitro drug release. All the formulations showed less than 10% of weight variation. The hardness and thickness of all the formulations were within the range of 3.7-4.2 kg/cm2 and 3.63-3.83 mm respectively. Floating lag time for all the formulations was reported in seconds. The degree of swelling was reported in range of 82.10-85.83%. In vitro release was carried out for 24 h. The maximum release was shown by F1 (93.947%) while the minimum release was observed for F4 (90.420%). The best formulation was optimized on the basis of percentage cumulative drug release, floating lag time and swelling index. F1 found to be the best formulation. Further on analyzing the drug release mechanism, F1 found to exhibit korsmeyer peppas model of drug release. CONCLUSION Floating gastroretentive tablet of methscopolamine bromide was successfully developed using direct compression method with potential to enhance the drug absorption and effective treatment of peptic ulcer.
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Affiliation(s)
- Maninder Pal Singh
- CT Institute of Pharmaceutical Sciences, Shahpur, Jalandhar Punjab.,MM College of Pharmacy, Maharishi Markandeshwar (Deemed to be University) Mullana -Ambala
| | - Manish Kumar
- MM College of Pharmacy, Maharishi Markandeshwar (Deemed to be University) Mullana -Ambala
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11
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Maheen S, Rasul A, Hanif M, Khan HU. Lipospheres for Simultaneous Controlled Release and Improved Pharmacokinetic Profiles of Saxagliptin-Enalapril: Formulation, Optimization, and Comparative In Vitro-In Vivo Evaluation. AAPS PharmSciTech 2020; 21:188. [PMID: 32651896 DOI: 10.1208/s12249-020-01733-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Accepted: 06/17/2020] [Indexed: 12/14/2022] Open
Abstract
The current study aims at formulating and optimizing lipospheres (LS) by the Box-Behnken design (BBD) from safe biodegradable carnauba wax (CW) to co-administer saxagliptin (SG) and enalapril (EP) for co-existing chronic hypertensive diabetes in order to overcome inadequacies of conventional modes of drug administration. Optimized liposphere formulation (OLF) was selected by a numerical optimization procedure and a comparative in vivo pharmacokinetic study of OLF and commercial brands was also performed. Discrete, free-flowing, spherical, smooth-surface LS having a size range of 5-10 μm and zeta potential of - 20 to - 30 mV were successfully formulated. Compatibility studies by FTIR and DSC proved the lack of interaction of components while XRD suggested the transformation of crystalline drugs to amorphous form. Outcomes of dependent optimizing variables like percentage yield (30-90%), EP-release (32-92%), and SG-release (28-95%) followed a polynomial quadratic model. Pharmacokinetics studies indicated a significantly lower Cmax of EP (125.22 ± 6.32) and SG (75.63 ± 3.85) and higher mean Tmax values (9.4 h for EP and 10.73 h for SG) from OLF in comparison with reference brands of EP (257.54 ± 8.23 ng/mL) and SG (393.66 ± 2.97 ng/mL). Additionally, a potential rise in half-life and MRT of SG and EP was achieved reaching approximately 2- to 3-fold higher than noted for reference brands. Importantly, the enhanced Tmax and AUC0-24 specified the achievement of enhanced bioavailability of both drugs from LS. Consequently, such an innovative approach could not only control drug release in both in vitro and in vivo analyses but also maintain plasma drug concentration for a longer time without maximizing Cmax leading towards effective management of chronic illnesses.
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12
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Porwal A, Dwivedi H, Pathak K. Gastroretentive bilayer film for sustained release of atorvastatin calcium and immediate release of amlodipine besylate: pharmaceutical, pharmacokinetic evaluation, and IVIVC. Pharm Dev Technol 2019; 25:416-431. [PMID: 31852330 DOI: 10.1080/10837450.2019.1705486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The present study was aimed to optimize capsulated unfolding type gastroretentive bilayer film constituting immediate release (IR) layer of amlodipine besylate and sustained release (SR) layer of atorvastatin calcium. A three-factor, three-level Box-Behnken-design was used to optimize bilayer film with dual-release characteristics. The selected independent variables were HPMC-K3, Eudragit RSPO, and Carbopol 934P and the responses were floating duration, swelling index, and in vitro release from SR layer in 8 h. The films were also assessed for pharmacotechnical characteristics, release kinetics, DSC, FTIR, and SEM. The pharmacokinetics of the drugs from the optimized formulation was compared with the marketed formulation in rabbits. The capsulated accordion film unfolded and provided SR of atorvastatin for 8 h (96.76% ± 0.71) and IR of amlodipine within 25 min (98.07% ± 0.62) for the optimized formulation (F14). The swelling index and floating duration for the optimized formulation were 140.48 ± 0.57 and 8.53 ± 0.10 h, respectively. Results of pharmacokinetics showed that faster absorption of amlodipine and improved bioavailability (2.16-fold) of atorvastatin in blood was made available through bilayer film. In vitro-in vivo correlation was established using numerical deconvolution method. It can be concluded that the capsulated gastroretentive system provided site specific simultaneous SR of antihyperlidemic drug and IR of antihypertensive drug as single pill that has therapeutic potential to manage cardiovascular risk.
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Affiliation(s)
- Amit Porwal
- Department of Pharmaceutics, Pharmacy College Saifai, Uttar Pradesh University of Medical Sciences, Etawah, India.,School of Pharmacy, Babu Banarasi Das University, Lucknow, India
| | - Harinath Dwivedi
- School of Pharmacy, Babu Banarasi Das University, Lucknow, India
| | - Kamla Pathak
- Department of Pharmaceutics, Pharmacy College Saifai, Uttar Pradesh University of Medical Sciences, Etawah, India
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13
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Chen D, Xu XY, Li R, Zang GA, Zhang Y, Wang MR, Xiong MF, Xu JR, Wang T, Fu H, Hu Q, Wu B, Yan GR, Fan TY. Preparation and In vitro Evaluation of FDM 3D-Printed Ellipsoid-Shaped Gastric Floating Tablets with Low Infill Percentages. AAPS PharmSciTech 2019; 21:6. [PMID: 31754916 DOI: 10.1208/s12249-019-1521-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Accepted: 08/26/2019] [Indexed: 02/04/2023] Open
Abstract
The aim of the study is to investigate the feasibility of fabricating FDM 3D-printed gastric floating tablets with low infill percentages and the effect of infill percentage on the properties of gastric floating tablets in vitro. Propranolol hydrochloride was selected as a model drug, and drug-loaded polyvinyl alcohol (PVA) filaments were produced by hot melt extrusion (HME). Ellipsoid-shaped gastric floating tablets with low infill percentage of 15% and 25% (namely E-15 and E-25) were then prepared respectively by feeding the extruded filaments to FDM 3D printer. Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM) were employed to characterize the filaments and 3D-printed tablets, and a series of evaluations were performed to the 3D-printed tablets, including the weight variation, drug content, hardness, in vitro floating behavior, and drug release of the tablets. The SEM results showed that the drug-loaded filaments and 3D-printed tablets appeared intact without defects, and the printed tablets were composed of filaments deposited uniformly layer by layer. The model drug and the excipients were thermally stable under the process temperature of extruding and printing, with a small amount of drug crystals dispersing in the drug-loaded filaments and 3D-printed tablets. Both E-15 and E-25 could float on artificial gastric fluids without any lag time and released in a sustained manner. Compared with E-15, the E-25 presented less weight variation, higher tablet hardness, shorter floating time, and longer drug release time.
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14
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Fernandes JBM, Celestino MT, Tavares MIB, Freitas ZMF, Santos EPD, Ricci Júnior E, Monteiro MSSB. The development and characterization of Propranolol Tablets using Tapioca starch as excipient. AN ACAD BRAS CIENC 2019; 91:e20180094. [PMID: 30994758 DOI: 10.1590/0001-3765201920180094] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 05/11/2018] [Indexed: 11/22/2022] Open
Abstract
Tapioca starch (TS) is produced from Cassaca roots and it is differentiated from other starches because it contains about 17-20% amylase and low amount of residual substances. Propranolol (POP) is a non-selective beta-adrenergic blocking agent and it is in the World Health Organization's List of Essential Medicines. The aim of this work was to investigate the potential of TS in the development of POP tablets by means of direct compression. Its evaluation was performed by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR) relaxometry, scanning electron microscopy (SEM), uniformity of weight, drug content, disintegration, friability, hardness, dissolution test and drug release kinetics. The TS granules were spherical with mean diameter of 10.09 ± 1.85 µm. The XRD, FTIR and NMR suggested physical interaction between TS and POP. The tablets presented average diameter of 1.1 ± 0.0 cm, 0.24 ± 0.02 cm thickness and average weight of 0.544 ± 0.003 g. The hardness of tablets was 10.98 ± 0.31 N and the percentage of friability was 25.74 ± 0.08%. POP was released after 45 min and the release kinetics properly fitted the Hixson-Crowell equation.
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Affiliation(s)
- Julyane B M Fernandes
- Departamento de Fármacos e Medicamentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Bloco L, Avenida Carlos Chagas Filho, 373, Cidade Universitária, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, Brazil
| | - Maísa T Celestino
- Departamento de Fármacos e Medicamentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Bloco L, Avenida Carlos Chagas Filho, 373, Cidade Universitária, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, Brazil
| | - Maria I B Tavares
- Instituto de Macromoléculas, Centro de Tecnologia, Universidade Federal do Rio de Janeiro, Avenida Horácio Macedo, 2030, Prédio J, Ilha do Fundão, 21941-598 Rio de Janeiro, RJ, Brazil
| | - Zaida M F Freitas
- Departamento de Fármacos e Medicamentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Bloco L, Avenida Carlos Chagas Filho, 373, Cidade Universitária, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, Brazil
| | - Elisabete P Dos Santos
- Departamento de Fármacos e Medicamentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Bloco L, Avenida Carlos Chagas Filho, 373, Cidade Universitária, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, Brazil
| | - Eduardo Ricci Júnior
- Departamento de Fármacos e Medicamentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Bloco L, Avenida Carlos Chagas Filho, 373, Cidade Universitária, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, Brazil
| | - Mariana S S B Monteiro
- Departamento de Fármacos e Medicamentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Bloco L, Avenida Carlos Chagas Filho, 373, Cidade Universitária, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, Brazil
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15
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Rahamathulla M, Saisivam S, Gangadharappa HV. Development of Valsartan Floating Matrix Tablets Using Low Density Polypropylene Foam Powder: In vitro and In vivo Evaluation. AAPS PharmSciTech 2019; 20:35. [PMID: 30604045 DOI: 10.1208/s12249-018-1265-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 11/26/2018] [Indexed: 11/30/2022] Open
Abstract
The main purpose of the study was to develop valsartan floating tablets (VFT) via non-effervescent technique using low density polypropylene foam powder, carbopol, and xanthan gum by direct compression. Before compression, the particulate powdered mixture was evaluated for pre-compression parameters. The prepared valsartan tablets were evaluated for post-compression parameters, swelling index, floating lag time, in vitro buoyancy studies, and in vitro and in vivo X-ray imaging studies in albino rabbits. The result of all formulations for pre- and post-compression parameters were within the limits of USP. FTIR and DSC studies revealed no interaction between the drug and polymers used. The prepared floating tablets had good swelling and floating capabilities for more than 12 h with zero floating lag time. The release of valsartan from optimized formulation NF-2 showed sustained release up to 12 h; which was found to be non-Fickian release. Moreover, the X-ray imaging of optimized formulation (NF-2) revealed that tablet was constantly floating in the stomach region of the rabbit, thereby indicating improved gastric retention time for more than 12 h. Consequently, all the findings and outcomes have showed that developed valsartan matrix tablets could be effectively used for floating drug delivery system.
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16
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Zhang Y, Zhang XT, Zhang Q, Wang B, Zhang T. Formulation development and evaluation of gastroretentive floating beads with Brucea javanica oil using ionotropic gelation technology. Chin J Nat Med 2018; 16:293-301. [PMID: 29703329 DOI: 10.1016/s1875-5364(18)30059-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Indexed: 11/29/2022]
Abstract
In the present study, a gastric retention floating system for Brucea javanica oil, composed of alginate and carrageenan, was prepared using ionotropic gelation. Parameters for floatability, drug load, encapsulation efficiency, bead morphology, in vitro release, and in vivo gastric retention were evaluated. The optimized formulation via Box-Behnken design consisted of 1.7% alginate (W/V), 1.02% carrageenan (W/V), 1.4% CaCO3 (W/V), and a gelling bath of pH 0.8. The alginate-carrageenan-Brucea javanica oil beads had a porous structure and exhibited up to 24 h of in vitro floatability with a load capacity of 45%-55% and an encapsulation efficiency of 70%-80%. A 6-h sustained release was observed in vitro. The beads had a prolonged gastric retention (> 60% at 6 h) in fasted rats, compared to non-floating beads (15% at 6 h), as measured by gamma scintigraphy with single-photon emission tomography/computed tomography (SPET/CT). In conclusion, the alginate-carrageenan-Brucea javanica oil system showed enhanced oil encapsulation efficiency, excellent floating and gastric retention abilities, and a favorable release behavior.
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Affiliation(s)
- Yue Zhang
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Xi-Tong Zhang
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Qi Zhang
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Bing Wang
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
| | - Tong Zhang
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
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17
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HPMC-Eudragit-Based Gastro-retentive Hydrodynamically Balanced System—Suitable for Sparingly Soluble and Freely Soluble Drugs: an In Vitro Study. J Pharm Innov 2018. [DOI: 10.1007/s12247-018-9330-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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18
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Martins SM, Müller V, Galan V, Souza FPD, Andreazza IF, Rosa MFD. Development and evaluation of multiparticulate biphasic system for the treatment of circadian diseases. BRAZ J PHARM SCI 2018. [DOI: 10.1590/s2175-97902018000417167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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19
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Afrasiabi Garekani H, Sanadgol N, Dehghan Nayyeri N, Nokhodchi A, Sadeghi F. Peculiar effect of polyethylene glycol in comparison with triethyl citrate or diethyl phthalate on properties of ethyl cellulose microcapsules containing propranolol hydrochloride in process of emulsion-solvent evaporation. Drug Dev Ind Pharm 2017; 44:421-431. [PMID: 29098888 DOI: 10.1080/03639045.2017.1395460] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Plasticizers play a crucial role in various process of microencapsulation. In this study, the effect of incorporation of plasticizer in process of emulsion solvent evaporation was investigated on properties of ethyl cellulose (EC) microcapsules containing propranolol hydrochloride. The effect of plasticizer type and concentration were investigated on characteristics of microcapsules prepared from different viscosity grades of EC. Product yield, encapsulation efficiency, mean particle size, shape, surface characteristics, solid state of drug, and drug release profiles were evaluated. Product yield and encapsulation efficiency were not dependent on plasticizer type and concentration. However, encapsulation efficiency decreased with increase in EC viscosity grade in the most of the cases. The mean particle size was in the range of 724-797 μm and was not dependent on plasticizer type. Microcapsules formed in the presence of PEG had a very smooth surface with few pores. XRD and DSC studies revealed a reduction of drug crystallinity after microencapsulation especially in presence of PEG. The results showed that the presence of TEC and DEP with different concentrations had no marked effect on drug release from microcapsules containing different viscosity grades of EC. This was not the case when PEG was used, and despite its water solubility it reduced the drug release rate noticeably. The reduction in the drug release in the presence of PEG was concentration-dependent. The use of PEG as a plasticizer in process of emulsion solvent evaporation highly improved the EC microcapsule structure and retarded the drug release rate and therefore is recommended.
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Affiliation(s)
- Hadi Afrasiabi Garekani
- a Pharmaceutical Research center , Mashhad University of Medical Sciences , Mashhad , Iran.,b Department of Pharmaceutics, School of pharmacy , Mashhad University of Medical Sciences , Mashhad , Iran
| | - Nasim Sanadgol
- b Department of Pharmaceutics, School of pharmacy , Mashhad University of Medical Sciences , Mashhad , Iran
| | - Nafiseh Dehghan Nayyeri
- b Department of Pharmaceutics, School of pharmacy , Mashhad University of Medical Sciences , Mashhad , Iran
| | - Ali Nokhodchi
- c Pharmaceutics Research Laboratory, School of Life Sciences , Arundel Building, University of Sussex , Brighton , UK.,d Applied Drug Research Center and Faculty of Pharmacy , Tabriz University of Medical Sciences , Tabriz, Iran
| | - Fatemeh Sadeghi
- b Department of Pharmaceutics, School of pharmacy , Mashhad University of Medical Sciences , Mashhad , Iran.,e Targeted Drug Delivery Research Center , Mashhad University of Medical Sciences , Mashhad , Iran
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20
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Porwal A, Dwivedi H, Pathak K. Decades of research in drug targeting using gastroretentive drug delivery systems for antihypertensive therapy. BRAZ J PHARM SCI 2017. [DOI: 10.1590/s2175-97902017000300173] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Amit Porwal
- Uttar Pradesh University of Medical Sciences, India
| | | | - Kamla Pathak
- Uttar Pradesh University of Medical Sciences, India
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21
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WITHDRAWN: A fractional factorial design to study the effect of process variables on preparation of methotrexate loaded chitosan nanoparticles. OPENNANO 2017. [DOI: 10.1016/j.onano.2017.04.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Ganguly A, Ian CK, Sheshala R, Sahu PS, Al-Waeli H, Meka VS. Application of diverse natural polymers in the design of oral gels for the treatment of periodontal diseases. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:39. [PMID: 28144851 DOI: 10.1007/s10856-017-5852-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 01/10/2017] [Indexed: 06/06/2023]
Abstract
The objective of this study was to prepare periodontal gels using natural polymers such as badam gum, karaya gum and chitosan. These gels were tested for their physical and biochemical properties and assessed for their antibacterial activity against Aggregatibacter actinomycetemcomitans and Streptococcus mutans, two pathogens associated with periodontal disease. Badam gum, karaya gum and chitosan were used to prepare gels of varying concentrations. Moxifloxacin hydrochloride, a known antimicrobial drug was choosen in the present study and it was added to the above gels. The gels were then run through a battery of tests in order to determine their physical properties such as pH and viscosity. Diffusion studies were carried out on the gels containing the drug. Antimicrobial testing of the gels against various bacteria was then carried out to determine the effectiveness of the gels against these pathogens. The results showed that natural polymers can be used to produce gels. These gels do not have inherent antimicrobial properties against A. actinomycetemcomitans and S. mutans. However, they can be used as a transport vehicle to carry and release antimicrobial drugs.
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Affiliation(s)
- Auleep Ganguly
- School of Dentistry, International Medical University, Kuala Lumpur, 57000, Malaysia
| | - Cheng Kang Ian
- School of Dentistry, International Medical University, Kuala Lumpur, 57000, Malaysia
| | - Ravi Sheshala
- School of Medicine, International Medical University, Kuala Lumpur, 57000, Malaysia
| | | | - Haider Al-Waeli
- School of Dentistry, International Medical University, Kuala Lumpur, 57000, Malaysia
| | - Venkata Srikanth Meka
- School of Medicine, International Medical University, Kuala Lumpur, 57000, Malaysia.
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23
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Zhang X, Zhang Y, Han H, Yang J, Xu B, Wang B, Zhang T. Formulation Optimization of Gastro-Retention Tablets of Paeonol and Efficacy in Treatment of Experimental Gastric Ulcer. Chem Pharm Bull (Tokyo) 2017; 65:706-713. [DOI: 10.1248/cpb.c16-00993] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Xitong Zhang
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine
- Shanghai Xiangshan Hospital of Traditional Chinese Medicine
| | - Yue Zhang
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine
| | - Han Han
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine
| | - Jun Yang
- Shanghai Xiangshan Hospital of Traditional Chinese Medicine
| | - Benliang Xu
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine
| | - Bing Wang
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine
| | - Tong Zhang
- Experiment Center for Teaching and Learning, Shanghai University of Traditional Chinese Medicine
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine
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24
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Diós P, Szigeti K, Budán F, Pócsik M, Veres DS, Máthé D, Pál S, Dévay A, Nagy S. Influence of barium sulfate X-ray imaging contrast material on properties of floating drug delivery tablets. Eur J Pharm Sci 2016; 95:46-53. [PMID: 27687639 DOI: 10.1016/j.ejps.2016.09.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Revised: 09/16/2016] [Accepted: 09/25/2016] [Indexed: 11/27/2022]
Abstract
The objective of the study was to reveal the influence of necessarily added barium sulfate (BaSO4) X-ray contrast material on floating drug delivery tablets. Based on literature survey, a chosen floating tablet composition was determined containing HPMC and carbopol 943P as matrix polymers. One-factor factorial design with five levels was created for evaluation of BaSO4 (X1) effects on experimental parameters of tablets including: floating lag time, total floating time, swelling-, erosion-, dissolution-, release kinetics parameters and X-ray detected volume changes of tablets. Applied concentrations of BaSO4 were between 0 and 20.0% resulting in remarkable alteration of experimental parameters related especially to flotation. Drastic deterioration of floating lag time and total floating time could be observed above 15.0% BaSO4. Furthermore, BaSO4 showed to increase the integrity of tablet matrix by reducing eroding properties. A novel evaluation of dissolutions from floating drug delivery systems was introduced, which could assess the quantity of drug dissolved from dosage form in floating state. In the cases of tablets containing 20.0% BaSO4, only the 40% of total API amount could be dissolved in floating state. In vitro fine resolution X-ray CT imagings were performed to study the volume change and the voxel distributions as a function of HU attenuations by histogram analysis of the images. X-ray detected relative volume change results did not show significant difference between samples. After 24h, all tablets containing BaSO4 could be segmented, which highlighted the fact that enough BaSO4 remained in the tablets for their identification.
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Affiliation(s)
- Péter Diós
- Institute of Pharmaceutical Technology and Biopharmacy, University of Pécs, Rókus str. 2, H-7624 Pécs, Hungary.
| | - Krisztián Szigeti
- Department of Biophysics and Radiation Biology, Semmelweis University, Tűzoltó utca 37-47, H-1094 Budapest, Hungary
| | - Ferenc Budán
- CROmed Translational Research Centers, Baross str. 91-95, H-1047 Budapest, Hungary; Department of Public Health Medicine, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
| | - Márta Pócsik
- CROmed Translational Research Centers, Baross str. 91-95, H-1047 Budapest, Hungary
| | - Dániel S Veres
- Department of Biophysics and Radiation Biology, Semmelweis University, Tűzoltó utca 37-47, H-1094 Budapest, Hungary
| | - Domokos Máthé
- Department of Biophysics and Radiation Biology, Semmelweis University, Tűzoltó utca 37-47, H-1094 Budapest, Hungary; CROmed Translational Research Centers, Baross str. 91-95, H-1047 Budapest, Hungary
| | - Szilárd Pál
- Institute of Pharmaceutical Technology and Biopharmacy, University of Pécs, Rókus str. 2, H-7624 Pécs, Hungary
| | - Attila Dévay
- Institute of Pharmaceutical Technology and Biopharmacy, University of Pécs, Rókus str. 2, H-7624 Pécs, Hungary
| | - Sándor Nagy
- Institute of Pharmaceutical Technology and Biopharmacy, University of Pécs, Rókus str. 2, H-7624 Pécs, Hungary
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Vakili H, Nyman JO, Genina N, Preis M, Sandler N. Application of a colorimetric technique in quality control for printed pediatric orodispersible drug delivery systems containing propranolol hydrochloride. Int J Pharm 2016; 511:606-618. [DOI: 10.1016/j.ijpharm.2016.07.032] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 07/04/2016] [Accepted: 07/15/2016] [Indexed: 10/21/2022]
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Recent progresses in bioadhesive microspheres via transmucosal administration. Colloids Surf B Biointerfaces 2015; 140:361-372. [PMID: 26774569 DOI: 10.1016/j.colsurfb.2015.12.049] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 12/05/2015] [Accepted: 12/26/2015] [Indexed: 01/04/2023]
Abstract
Based on the advantages of adhesion preparations and the application status of microspheres (MSs) in mucous delivery, this paper primarily reviews the bioadhesive MSs via transmucosal administration routes, including the mucosa in alimentary tract and other lumens. Particularly, the detailed researches about of celladhesive MSs and some new-style bioadhesive MSs are mentioned. Furthermore, this review attempts to reveal the advances of bioadhesive MSs as cell-selective bioadhesion systems and the stimuli-responsive MSs as location-specific drug delivery systems. Although these MSs show powerful strength, some far-sighted ideas should be brought on agendas. In the future, mechanisms should be put under tight scrutiny and more attention should be focused on the excellent bioadhesive materials and the 'second generation mucoadhesives'. Meaningful clinical applications of these novel MSs are also of current concerns and need more detailed researches.
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Li J, Wang H, Li H, Xu L, Guo Y, Lu F, Pan W, Li S. Mutual interaction between guest drug molecules and host nanoporous silica xerogel studied using central composite design. Int J Pharm 2015; 498:32-9. [PMID: 26657276 DOI: 10.1016/j.ijpharm.2015.12.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 11/11/2015] [Accepted: 12/03/2015] [Indexed: 11/16/2022]
Abstract
In the present study, three water-soluble drugs (propranolol hydrochloride, PNH; diltiazem hydrochloride, DZH; levofloxacin hydrochloride, LFH) with different number of hydrogen bonding acceptors were used as guest drug molecules, and three kinds of biomimetic synthesized nanoporous silica@poly(ethyleneimine)s xerogel (NS@P xerogel, 25%NS@P xerogel and 75%NS@P xerogel) were taken as host drug carriers. Mutural interaction formed between guest drug molecules and host drug carriers were investigated using a two-level three-factorial central composite design. The results confirmed that water-soluble drug loaded three nanoporous silica carriers presented the same regular controlled release effect, which was 75%NS@P xerogel>25%NS@P xerogel>NS@P xerogel. The main contribution to burst release was the pore diameter of host carrier. Accomplishment of cumulative release in 24h can be obtained when loading guest drug molecules with small number of hydrogen bonding acceptors to host carriers with either quite small or large pore diameter. The present work can favor to explore the mutural interaction between host carrier and guest drug molecules and thus promoted the development of nanoporous silica in pharmaceutical application.
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Affiliation(s)
- Jing Li
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China
| | - Hongyu Wang
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China
| | - Heran Li
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China
| | - Lu Xu
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China
| | - Yingyu Guo
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China
| | - Fangzheng Lu
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China
| | - Weisan Pan
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China
| | - Sanming Li
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China.
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Gao Y, Gao Y, Yin F, Wang M, Wang Z, Ye T, Yang Y, Pan WS, Yang X. Preparation and pharmacokinetics study on gastro-floating sustained-release tablets of troxipide. Drug Dev Ind Pharm 2014; 41:1443-51. [PMID: 25190152 DOI: 10.3109/03639045.2014.956113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The purpose of this research aimed at preparing gastro-floating sustained-release tablets of troxipide and a further study on in vitro release and in vivo bioavailability. Under the circumstances of direct powder compression, the floating tablets were successfully prepared with HPMC as main matrix material, Carbopol as assistant matrix material, octadecanol as floating agent and sodium bicarbonate as foaming agent to float by gas-forming. The floating time and accumulative release amount as evaluation indexes were utilized to perform pre-experiment screening and single-factor test, respectively, while central composite design response surface method was applied for formulation optimization, followed by in vivo pharmacokinetic study in beagles after oral administration for floating tablets and commercial tablets used as the control. The results indicated that the floating sustained-release tablets held a better capability for floating and drug release and more satisfactory pharmacokinetic parameters, such as a lower Cmax, a prolonged Tmax, but an equivalent bioavailability calculated by AUC0-24 compared to commercial tablets. So a conclusion was finally drawn that the floating sustained-release tablets possessing a good release property could be suitable for demands of design.
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Affiliation(s)
- Yunyun Gao
- a Department of Pharmaceutics, School of Pharmacy , Shenyang Pharmaceutical University , Shenyang , Liaoning , China
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Meka VS, Dharmanlingam SR, Kolapalli VRM. Formulation of gastroretentive floating drug delivery system using hydrophilic polymers and its in vitro characterization. BRAZ J PHARM SCI 2014. [DOI: 10.1590/s1984-82502014000200023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of the present research is to formulate and evaluate the gastroretentive floating drug delivery system of antihypertensive drug, propranolol HCl. Gastroretentive floating tablets (GRFT) were prepared by using a synthetic hydrophilic polymer polyethylene oxide of different grades such as PEO WSR N-12 K and PEO 18 NF as release retarding polymers and calcium carbonate as gas generating agent. The GRFT were compressed by direct compression strategy and the tablets were evaluated for physico-chemical properties, in vitro buoyancy, swelling studies, in vitro dissolution studies and release mechanism studies. From the dissolution and buoyancy studies, F 9 was selected as an optimized formulation. The optimized formulation followed zero order rate kinetics with non-Fickian diffusion mechanism. The optimized formulation was characterised with FTIR studies and observed no interaction between the drug and the polymers.
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The use of Hibiscus esculentus (Okra) gum in sustaining the release of propranolol hydrochloride in a solid oral dosage form. BIOMED RESEARCH INTERNATIONAL 2014; 2014:735891. [PMID: 24678512 PMCID: PMC3942280 DOI: 10.1155/2014/735891] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Revised: 12/12/2013] [Accepted: 12/30/2013] [Indexed: 11/22/2022]
Abstract
The effectiveness of Okra gum in sustaining the release of propranolol hydrochloride in a tablet was studied. Okra gum was extracted from the pods of Hibiscus esculentus using acetone as a drying agent. Dried Okra gum was made into powder form and its physical and chemical characteristics such as solubility, pH, moisture content, viscosity, morphology study using SEM, infrared study using FTIR, crystallinity study using XRD, and thermal study using DSC and TGA were carried out. The powder was used in the preparation of tablet using granulation and compression methods. Propranolol hydrochloride was used as a model drug and the activity of Okra gum as a binder was compared by preparing tablets using a synthetic and a semisynthetic binder which are hydroxylmethylpropyl cellulose (HPMC) and sodium alginate, respectively. Evaluation of drug release kinetics that was attained from dissolution studies showed that Okra gum retarded the release up to 24 hours and exhibited the longest release as compared to HPMC and sodium alginate. The tensile and crushing strength of tablets was also evaluated by conducting hardness and friability tests. Okra gum was observed to produce tablets with the highest hardness value and lowest friability. Hence, Okra gum was testified as an effective adjuvant to produce favourable sustained release tablets with strong tensile and crushing strength.
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31
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Bhardwaj P, Singh R, Swarup A. Development and characterization of newer floating film bearing 5-fluorouracil as a model drug. J Drug Deliv Sci Technol 2014. [DOI: 10.1016/s1773-2247(14)50092-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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32
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Sonar PA, Behera AL, Banerjee SK, Gaikwad DD, Harer SL. Preparation and characterization of Simvastatin solid dispersion using skimmed milk. Drug Dev Ind Pharm 2013; 41:22-7. [PMID: 24160569 DOI: 10.3109/03639045.2013.845836] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- P A Sonar
- Department of Pharmaceutics, Vishal Institute of Pharmaceutical Education & Research , Ale, Pune, Maharashtra , India and
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Saisivam S, Rahamath Ulla M, Shakeel F. Development of Floating Matrix Tablets of Losartan Potassium: In Vitro and in Vivo Evaluation. J Drug Deliv Sci Technol 2013. [DOI: 10.1016/s1773-2247(13)50093-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Meka VS, Nali SR, Songa AS, Kolapalli VRM. Characterization and in vitro drug release studies of a natural polysaccharide Terminalia catappa gum (Badam gum). AAPS PharmSciTech 2012; 13:1451-64. [PMID: 23090110 PMCID: PMC3513443 DOI: 10.1208/s12249-012-9873-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Accepted: 10/05/2012] [Indexed: 11/30/2022] Open
Abstract
The main objective of the present study is the physicochemical characterization of naturally available Terminalia catappa gum (Badam gum [BG]) as a novel pharmaceutical excipient and its suitability in the development of gastroretentive floating drug delivery systems (GRFDDS) to retard the drug for 12 h when the dosage form is exposed to gastrointestinal fluids in the gastric environment. As BG was being explored for the first time for its pharmaceutical application, physicochemical, microbiological, rheological, and stability studies were carried out on this gum. In the present investigation, the physicochemical properties, such as micromeritic, rheological, melting point, moisture content, pH, swelling index, water absorption, and volatile acidity, were evaluated. The gum was characterized by scanning electron microscopy, differential scanning calorimetry (DSC), powder X-ray diffraction studies (PXRD), and Fourier transform infrared spectroscopy (FTIR). Gastroretentive floating tablets of BG were prepared with the model drug propranolol HCl by direct compression methods. The prepared tablets were evaluated for all their physicochemical properties, in vitro buoyancy, in vitro drug release, and rate order kinetics. PBG 04 was selected as an optimized formulation based on its 12-h drug release and good buoyancy characteristics. The optimized formulation was characterized with FTIR, DSC, and PXRD studies, and no interaction between the drug and BG was found. Thus, the study confirmed that BG might be used in the gastroretentive drug delivery system as a release-retarding polymer.
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Affiliation(s)
- Venkata Srikanth Meka
- School of Pharmacy, International Medical University, Kuala Lumpur, 57000, Malaysia.
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Mishra M, Mishra B. Mucoadhesive microparticles as potential carriers in inhalation delivery of doxycycline hyclate: a comparative study. Acta Pharm Sin B 2012. [DOI: 10.1016/j.apsb.2012.05.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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36
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Darandale SS, Vavia PR. Design of a gastroretentive mucoadhesive dosage form of furosemide for controlled release. Acta Pharm Sin B 2012. [DOI: 10.1016/j.apsb.2012.05.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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37
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Modified chitosan hydrogels as drug delivery and tissue engineering systems: present status and applications. Acta Pharm Sin B 2012. [DOI: 10.1016/j.apsb.2012.07.004] [Citation(s) in RCA: 217] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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38
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Choudhary A, Rana AC, Aggarwal G, Kumar V, Zakir F. Development and characterization of an atorvastatin solid dispersion formulation using skimmed milk for improved oral bioavailability. Acta Pharm Sin B 2012. [DOI: 10.1016/j.apsb.2012.05.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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