1
|
Malik MK, Kumar V, Kumarasamy V, Singh OP, Kumar M, Dixit R, Subramaniyan V, Singh J. Film Coating of Phosphorylated Mandua Starch on Matrix Tablets for pH-Sensitive Release of Mesalamine. Molecules 2024; 29:3208. [PMID: 38999160 PMCID: PMC11243319 DOI: 10.3390/molecules29133208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 12/04/2023] [Accepted: 12/12/2023] [Indexed: 07/14/2024] Open
Abstract
Chemically modified mandua starch was successfully synthesized and applied to coat mesalamine-loaded matrix tablets. The coating material was an aqueous dispersion of mandua starch modified by sodium trimetaphosphate and sodium tripolyphosphate. To investigate the colon-targeting release competence, chemically modified mandua starch film-coated mesalamine tablets were produced using the wet granulation method followed by dip coating. The effect of the coating on the colon-targeted release of the resultant delivery system was inspected in healthy human volunteers and rabbits using roentgenography. The results show that drug release was controlled when the coating level was 10% w/w. The release percentage in the upper gastric phase (pH 1.2, simulated gastric fluid) was less than 6% and reached up to 59.51% w/w after 14 h in simulated colonic fluid. In addition to in vivo roentgenographic studies in healthy rabbits, human volunteer studies proved the colon targeting efficiency of the formulation. These results clearly demonstrated that chemically modified mandua starch has high effectiveness as a novel aqueous coating material for controlled release or colon targeting.
Collapse
Affiliation(s)
- Mayank Kumar Malik
- Department of Chemistry, Gurukula Kangri (Deemed to be University), Haridwar 249407, India; (M.K.M.); (J.S.)
| | - Vipin Kumar
- Department of Pharmaceutical Sciences, Gurukula Kangri (Deemed to be University), Haridwar 249407, India;
| | - Vinoth Kumarasamy
- Department of Parasitology and Medical Entomology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaacob Latif, Cheras, Kuala Lumpur 56000, Malaysia
| | - Om Prakash Singh
- Department of Kaya Chikitsa, Rishikul Campus, Haridwar, Uttarakhand Ayurved University, Dehradun 248001, India;
| | - Mukesh Kumar
- Department of Botany and Microbiology, Gurukula Kangri (Deemed to be University), Haridwar 249407, India;
| | - Raghav Dixit
- Department of Pharmaceutical Sciences, Gurukula Kangri (Deemed to be University), Haridwar 249407, India;
| | - Vetriselvan Subramaniyan
- Pharmacology Unit, Jeffrey Cheah School of Medicine and Health Sciences, Monash University, Jalan Lagoon Selatan, Bandar Sunway, Selangor Darul Ehsan 47500, Malaysia
- School of Bioengineering and Biosciences, Lovely Professional University, Phagwara 144001, India
| | - Jaspal Singh
- Department of Chemistry, Gurukula Kangri (Deemed to be University), Haridwar 249407, India; (M.K.M.); (J.S.)
| |
Collapse
|
2
|
Ojsteršek T, Vrečer F, Hudovornik G. Comparative Fitting of Mathematical Models to Carvedilol Release Profiles Obtained from Hypromellose Matrix Tablets. Pharmaceutics 2024; 16:498. [PMID: 38675159 PMCID: PMC11053526 DOI: 10.3390/pharmaceutics16040498] [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: 03/11/2024] [Revised: 03/31/2024] [Accepted: 04/02/2024] [Indexed: 04/28/2024] Open
Abstract
The mathematical models available in DDSolver were applied to experimental dissolution data obtained by analysing carvedilol release from hypromellose (HPMC)-based matrix tablets. Different carvedilol release profiles were generated by varying a comprehensive selection of fillers and carvedilol release modifiers in the formulation. Model fitting was conducted for the entire relevant dissolution data, as determined by using a paired t-test, and independently for dissolution data up to approximately 60% of carvedilol released. The best models were selected based on the residual sum of squares (RSS) results used as a general measure of goodness of fit, along with the utilization of various criteria for visual assessment of model fit and determination of the acceptability of estimated model parameters indicating burst release or lag time concerning experimental dissolution results and previous research. In addition, a model-dependent analysis of carvedilol release mechanisms was carried out.
Collapse
Affiliation(s)
- Tadej Ojsteršek
- KRKA, d. d., 8501 Novo Mesto, Slovenia
- Faculty of Pharmacy, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Franc Vrečer
- KRKA, d. d., 8501 Novo Mesto, Slovenia
- Faculty of Pharmacy, University of Ljubljana, 1000 Ljubljana, Slovenia
| | | |
Collapse
|
3
|
Li Y, Wurster DE. The Effects of Curing and Casting Methods on the Physicochemical Properties of Polymer Films. AAPS PharmSciTech 2018; 19:2740-2749. [PMID: 29978291 DOI: 10.1208/s12249-018-1113-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 06/20/2018] [Indexed: 11/30/2022] Open
Abstract
Most film coatings in the pharmaceutical industry are prepared using organic solvents or aqueous solvents. Due to different film-formation mechanisms, their properties are significantly different from each other. Curing can alter the microstructure of films by improving the coalescence of polymer particles for aqueous dispersion-based films or accelerating macromolecule relaxation for organic solvent-based films. The aim of this study was to investigate the effects of preparation methods and curing on the physicochemical properties of Kollicoat® SR30D and Kollicoat® MAE100P films. The film's properties, including water diffusion coefficient, mechanical properties, plasticizer loss, swelling behavior, and contact angle, were measured for uncured or cured aqueous dispersion-based or organic solvent-based films. The results indicated that curing decreased water diffusivities in films and increased film's tensile strength. Curing resulted in plasticizer loss from SR30D films but not from MAE100P films due to strong interaction between plasticizer and MAE100P. The surface of organic solvent-based films was more hydrophobic than that of aqueous dispersion-based films. The contact angle of organic solvent-based films was increased after curing possibly because curing decreased roughness of the film surface. Organic solvent-based SR30D films had better mechanical properties than the corresponding aqueous dispersion-based films because of higher degree of polymer-polymer entanglement in the organic solvent-based films. However, contradictory phenomena were observed in MAE100P films possibly due to a "core-shell" structure reserved in the aqueous dispersion-based MAE100P films. In summary, casting methods and curing have significant impact on the film properties due to different film structures, coalescence, or film relaxation, and other concurrent effects including evaporation of residue solvent and plasticizers.
Collapse
|
4
|
Delivery of oat-derived phytoceramides into the stratum corneum of the skin using nanocarriers: Formulation, characterization and in vitro and ex-vivo penetration studies. Eur J Pharm Biopharm 2018; 127:260-269. [DOI: 10.1016/j.ejpb.2018.02.037] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Revised: 02/27/2018] [Accepted: 02/27/2018] [Indexed: 01/02/2023]
|
5
|
Pantelić I, Savić S, Milić J, Vuleta G. Film-forming materials in contemporary formulations of cosmetic products. ARHIV ZA FARMACIJU 2018. [DOI: 10.5937/arhfarm1801046p] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
|
6
|
Khairuddin N, Siddique BM, Muhamad II. Physicochemical Properties and Antibacterial Effect of Lysozyme Incorporated in a Wheat-Based Active Packaging Film. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2017. [DOI: 10.1007/s13369-017-2444-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
7
|
A novel photo-grafting of acrylamide onto carboxymethyl starch. 1. Utilization of CMS-g-PAAm in easy care finishing of cotton fabrics. Carbohydr Polym 2016; 152:105-118. [DOI: 10.1016/j.carbpol.2016.06.088] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 06/18/2016] [Accepted: 06/21/2016] [Indexed: 11/22/2022]
|
8
|
Korhonen K, Poikolainen M, Korhonen O, Ketolainen J, Laitinen R. Systematic evaluation of a spraying method for preparing thin Eudragit-drug films by Design of Experiments. J Drug Deliv Sci Technol 2016. [DOI: 10.1016/j.jddst.2016.04.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
|
9
|
Versino F, Lopez OV, Garcia MA, Zaritzky NE. Starch-based films and food coatings: An overview. STARCH-STARKE 2016. [DOI: 10.1002/star.201600095] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Florencia Versino
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos); Facultad de Ciencias Exactas; UNLP - CONICET; Calle 47 y 116 La Plata (B1900AJJ); Buenos Aires Argentina
- Facultad de Ingeniería; UNLP; Argentina
| | - Olivia V. Lopez
- PLAPIQUI (UNS-CONICET), Departamento de Ingeniería Química; UNS; Camino La Carrindanga; Bahía Blanca Argentina
| | - Maria A. Garcia
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos); Facultad de Ciencias Exactas; UNLP - CONICET; Calle 47 y 116 La Plata (B1900AJJ); Buenos Aires Argentina
| | - Noemi E. Zaritzky
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos); Facultad de Ciencias Exactas; UNLP - CONICET; Calle 47 y 116 La Plata (B1900AJJ); Buenos Aires Argentina
- Facultad de Ingeniería; UNLP; Argentina
| |
Collapse
|
10
|
Novel Starch-PVA Polymer for Microparticle Preparation and Optimization Using Factorial Design Study. INTERNATIONAL SCHOLARLY RESEARCH NOTICES 2015; 2015:261476. [PMID: 27347511 PMCID: PMC4897262 DOI: 10.1155/2015/261476] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 10/21/2014] [Accepted: 10/27/2014] [Indexed: 12/18/2022]
Abstract
The aim of our present work was to optimize the ratio of a very novel polymer, starch-polyvinyl alcohol (PVA), for controlled delivery of Ornidazole. Polymer-coated drug microparticles were prepared by emulsion method. Microscopic study, scanning electron microscopic study, and atomic force microscopic study revealed that the microparticles were within 10 micrometers of size with smooth spherical shape. The Fourier transform infrared spectroscopy showed absence of drug polymer interaction. A statistical 3(2) full factorial design was used to study the effect of different concentration of starch and PVA on the drug release profile. The three-dimensional plots gave us an idea about the contribution of each factor on the release kinetics. Hence this novel polymer of starch and polyvinyl alcohol can be utilized for control release of the drug from a targeted delivery device.
Collapse
|
11
|
Choi DH, Lim JY, Shin S, Choi WJ, Jeong SH, Lee S. A Novel Experimental Design Method to Optimize Hydrophilic Matrix Formulations with Drug Release Profiles and Mechanical Properties. J Pharm Sci 2014; 103:3083-94. [DOI: 10.1002/jps.24080] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Revised: 06/03/2014] [Accepted: 06/05/2014] [Indexed: 11/10/2022]
|
12
|
Jafar Mazumder MA. Polyelectrolyte complexation between cationic and anionic polyelectrolytes with complementary polymer-bound reactive groups of amine and acetoacetate: effect of mono- and divalent salts. IRANIAN POLYMER JOURNAL 2014. [DOI: 10.1007/s13726-014-0239-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
13
|
Niu Y, Li H. Controlled Release of Urea Encapsulated by Starch-g-poly(vinyl acetate). Ind Eng Chem Res 2012. [DOI: 10.1021/ie301684p] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
|
14
|
Silk fibroin as a vehicle for drug delivery applications. J Control Release 2011; 150:128-41. [DOI: 10.1016/j.jconrel.2010.11.007] [Citation(s) in RCA: 369] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2010] [Accepted: 11/02/2010] [Indexed: 11/20/2022]
|
15
|
Zhang Y, Huo M, Zhou J, Zou A, Li W, Yao C, Xie S. DDSolver: an add-in program for modeling and comparison of drug dissolution profiles. AAPS J 2010; 12:263-71. [PMID: 20373062 PMCID: PMC2895453 DOI: 10.1208/s12248-010-9185-1] [Citation(s) in RCA: 953] [Impact Index Per Article: 68.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2009] [Accepted: 03/08/2010] [Indexed: 11/30/2022] Open
Abstract
In recent years, several mathematical models have been developed for analysis of drug dissolution data, and many different mathematical approaches have been proposed to assess the similarity between two drug dissolution profiles. However, until now, no computer program has been reported for simplifying the calculations involved in the modeling and comparison of dissolution profiles. The purposes of this article are: (1) to describe the development of a software program, called DDSolver, for facilitating the assessment of similarity between drug dissolution data; (2) to establish a model library for fitting dissolution data using a nonlinear optimization method; and (3) to provide a brief review of available approaches for comparing drug dissolution profiles. DDSolver is a freely available program which is capable of performing most existing techniques for comparing drug release data, including exploratory data analysis, univariate ANOVA, ratio test procedures, the difference factor f (1), the similarity factor f (2), the Rescigno indices, the 90% confidence interval (CI) of difference method, the multivariate statistical distance method, the model-dependent method, the bootstrap f (2) method, and Chow and Ki's time series method. Sample runs of the program demonstrated that the results were satisfactory, and DDSolver could be served as a useful tool for dissolution data analysis.
Collapse
Affiliation(s)
- Yong Zhang
- />Department of Pharmaceutics, China Pharmaceutical University, No. 24, Tongjiaxiang, 210009 Nanjing, China
| | - Meirong Huo
- />Department of Pharmaceutics, China Pharmaceutical University, No. 24, Tongjiaxiang, 210009 Nanjing, China
| | - Jianping Zhou
- />Department of Pharmaceutics, China Pharmaceutical University, No. 24, Tongjiaxiang, 210009 Nanjing, China
| | - Aifeng Zou
- />Department of Pharmaceutics, China Pharmaceutical University, No. 24, Tongjiaxiang, 210009 Nanjing, China
| | - Weize Li
- />Department of Pharmaceutics, China Pharmaceutical University, No. 24, Tongjiaxiang, 210009 Nanjing, China
| | - Chengli Yao
- />Department of Pharmaceutics, China Pharmaceutical University, No. 24, Tongjiaxiang, 210009 Nanjing, China
| | - Shaofei Xie
- />Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education, Center for Instrumental Analysis, China Pharmaceutical University, No.24, Tongjiaxiang, 210009 Nanjing, China
| |
Collapse
|
16
|
Li X, Guo H, Heinamaki J. Aqueous coating dispersion (pseudolatex) of zein improves formulation of sustained-release tablets containing very water-soluble drug. J Colloid Interface Sci 2010; 345:46-53. [DOI: 10.1016/j.jcis.2010.01.029] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2009] [Revised: 01/10/2010] [Accepted: 01/13/2010] [Indexed: 11/17/2022]
|
17
|
Ramírez-Arreola DE, Robledo-Ortiz JR, Arellano M, González-Núñez R, Rodrigue D. Rapid Starch Acetylation at Low Temperature Using Iodine as Catalyst. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/masy.200950923] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
18
|
Xu W, Yang Y. Drug release and its relationship with kinetic and thermodynamic parameters of drug sorption onto starch acetate fibers. Biotechnol Bioeng 2009; 105:814-22. [DOI: 10.1002/bit.22594] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
19
|
Knezevic Z, Gosak D, Hraste M, Rausl D, Khan MZI. Application of Hot-Melt Coating Process for Designing a Lipid Based Controlled Release Drug Delivery System for Highly Aqueous Soluble Drugs. Chem Pharm Bull (Tokyo) 2009; 57:464-71. [DOI: 10.1248/cpb.57.464] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Zdravka Knezevic
- Faculty of Chemical Engineering and Technology, University of Zagreb
| | | | - Marin Hraste
- Faculty of Chemical Engineering and Technology, University of Zagreb
| | | | | |
Collapse
|
20
|
Xu W, Yang W, Yang Y. Electrospun starch acetate nanofibers: Development, properties, and potential application in drug delivery. Biotechnol Prog 2009; 25:1788-95. [DOI: 10.1002/btpr.242] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
21
|
Nutan MTH, Vaithiyalingam SR, Khan MA. Controlled Release Multiparticulate Beads Coated with Starch Acetate: Material Characterization, and Identification of Critical Formulation and Process Variables. Pharm Dev Technol 2008; 12:307-20. [PMID: 17613894 DOI: 10.1080/10837450701247483] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The objectives of the present investigation were to prepare and characterize starch acetate (SA) with high degree of substitution (dS) and to study its prospect as film-forming agent in a controlled-release multiparticulate drug delivery system. As a part of the development process by quality by design, the objectives also included identification of critical formulation and process variables that affect the release of a drug. SA, a relatively new polymer, was characterized because it showed good film-forming properties. SA with dS 2.9 was synthesized from corn starch by paste disruption technique. It was compared with the raw material, starch, by Fourier transform infrared spectroscopy, X-ray diffraction, and molecular mass analysis. Viscosity of SA solution increased logarithmically with the polymer concentration. At higher polymer concentrations (1.5-5.0%), the solutions showed pseudoplastic behavior. Among the plasticizers tested, triacetin and triethyl citrate yielded free films with acceptable mechanical properties. The glass transition temperature (Tg) of the films could be well controlled by these plasticizers. Unplasticized film showed a Tg of 31.8 degrees C. A trend was found that increase in triacetin concentration in SA films resulted in increase in permeability coefficient for tritiated water. Scanning electron microscopic photographs showed a clear and smooth plasticized film compared to rough unplasticized film. Dyphylline-loaded beads were coated with highly substituted SA to evaluate the main effects of the formulation and process variables on the release of the drug and to figure out the reliability of the screening design. A seven-factor, twelve-run Plackett-Burman screening design was used. The response variables were cumulative percent of drug released in 0.5, 1, 4, 8, and 12 hr. Quantitative evaluation of the design revealed that coating weight gain, plasticizer concentration, and post-drying temperature had greater influence on the drug release than the others. The main effects on drug release after 12 hr decreased in the following order: coating weight gain (-7.81), plasticizer concentration (4.96), postdrying temperature (-2.51), SA concentration (-0.80), inlet temperature (0.51), postdrying time (-0.31), and atomizing pressure (-0.28).
Collapse
Affiliation(s)
- Mohammad T H Nutan
- Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M University Health Science Center, Kingsville, TX, USA
| | | | | |
Collapse
|
22
|
López OV, García MA, Zaritzky NE. Film forming capacity of chemically modified corn starches. Carbohydr Polym 2008; 73:573-81. [DOI: 10.1016/j.carbpol.2007.12.023] [Citation(s) in RCA: 137] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Revised: 12/21/2007] [Accepted: 12/27/2007] [Indexed: 11/30/2022]
|
23
|
El-Tahlawy K, Venditti R, Pawlak J. Effect of alkyl ketene dimer reacted starch on the properties of starch microcellular foam using a solvent exchange technique. Carbohydr Polym 2008. [DOI: 10.1016/j.carbpol.2007.11.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
24
|
Dissolution kinetics and physical characterization of three-layered tablet with poly(ethylene oxide) core matrix capped by Carbopol. Int J Pharm 2008; 356:121-9. [DOI: 10.1016/j.ijpharm.2008.01.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2007] [Revised: 12/11/2007] [Accepted: 01/02/2008] [Indexed: 11/17/2022]
|
25
|
Chen L, Xie Z, Zhuang X, Chen X, Jing X. Controlled release of urea encapsulated by starch-g-poly(l-lactide). Carbohydr Polym 2008. [DOI: 10.1016/j.carbpol.2007.09.003] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
26
|
Stress of pH and acetate on product formation of fermenting polysaccharide-rich organic waste. Biochem Eng J 2008. [DOI: 10.1016/j.bej.2007.08.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
27
|
Strübing S, Metz H, Syrowatka F, Mäder K. Monitoring of dissolution induced changes in film coat composition by 1H NMR spectroscopy and SEM. J Control Release 2007; 119:190-6. [PMID: 17434640 DOI: 10.1016/j.jconrel.2007.03.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2006] [Revised: 03/01/2007] [Accepted: 03/05/2007] [Indexed: 10/23/2022]
Abstract
In our study we investigated the release mechanisms of coated oral dosage forms more deeply. The aim of the study was to monitor the buffer induced leaching out of water soluble compounds from Kollicoat SR films and to relate this process to the film properties and the release kinetics. Propranolol HCl tablets were coated with different amounts and ratios of polyvinyl acetate (Kollicoat SR) and poly(vinyl alcohol)-poly(ethylene glycol)-graft-copolymer (Kollicoat IR). Polyvinyl pyrrolidone (Kollidon 30) was added as a second water soluble polymer and triacetin as a plasticizer. In addition to kinetics of the drug release, the films were studied by SEM and 1H NMR spectroscopy. SEM micrographs revealed morphological changes of the tablet surface that were related to an alteration in film coat composition. The described 1H NMR method provided the opportunity to quantify the leaching of Kollicoat IR, Kollidon 30 and triacetin. Drug release kinetics were related to dissolution induced changes in coating composition. Permeability of the film coat increased, when about 90% of the water soluble polymers and plasticizer triacetin were leached out of the film coat.
Collapse
Affiliation(s)
- Sandra Strübing
- Martin-Luther-University Halle-Wittenberg, Department of Pharmaceutics and Biopharmaceutics, Wolfgang-Langenbeck-Str. 4, 06114 Halle/Saale, Germany
| | | | | | | |
Collapse
|
28
|
Bolivar AI, Venditti RA, Pawlak JJ, El-Tahlawy K. Development and characterization of novel starch and alkyl ketene dimer microcellular foam particles. Carbohydr Polym 2007. [DOI: 10.1016/j.carbpol.2006.10.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
29
|
de Vasconcelos CL, Bezerril PM, dos Santos DES, Dantas TNC, Pereira MR, Fonseca JLC. Effect of Molecular Weight and Ionic Strength on the Formation of Polyelectrolyte Complexes Based on Poly(methacrylic acid) and Chitosan. Biomacromolecules 2006; 7:1245-52. [PMID: 16602745 DOI: 10.1021/bm050963w] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chitosan/poly(methacrylic acid) complexes, CS/PMAA, were prepared via dropwise addition of a solution of PMAA to a solution of chitosan in acetic acid 2 wt %. The increase in molecular weight of PMAA inhibited the formation of insoluble complexes, while the increase in ionic strength first favored the formation of the complex followed by inhibiting it at higher concentrations. These observations were related to a description of polyelectrolyte complexation that was strongly dependent on macromolecular dimensions, both in terms of molecular weight and of coil expansion/contraction driven by polyelectrolyte effect.
Collapse
Affiliation(s)
- C L de Vasconcelos
- Departamento de Química, Universidade Federal do Rio Grande do Norte, Campus Universitario, Lagoa Nova, RN 59078-970, Brazil
| | | | | | | | | | | |
Collapse
|