1
|
Zhang Q, Mao J, Liao Y, Xu T, Zhang H, Du A, Yang X, Lin C, Mao J. Evaluation of temperature resistance of non chemical crosslinked double-tailed hydrophobically associating polymer fracturing fluid. REACT FUNCT POLYM 2022. [DOI: 10.1016/j.reactfunctpolym.2022.105268] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
2
|
Huang C, Sun F, Ma X, Gao C, Yang N, Nishinari K. Hydrophobically modified chitosan microgels stabilize high internal phase emulsions with high compliance. Carbohydr Polym 2022; 288:119277. [DOI: 10.1016/j.carbpol.2022.119277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 01/16/2022] [Accepted: 02/18/2022] [Indexed: 11/02/2022]
|
3
|
Silvestre J, Delattre C, Michaud P, de Baynast H. Optimization of Chitosan Properties with the Aim of a Water Resistant Adhesive Development. Polymers (Basel) 2021; 13:polym13224031. [PMID: 34833330 PMCID: PMC8622511 DOI: 10.3390/polym13224031] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 11/15/2021] [Accepted: 11/19/2021] [Indexed: 11/16/2022] Open
Abstract
Chitosan is a bio-sourced polysaccharide widely used in different fields from health to wastewater treatment through food supplements. Another important use of this polymer is adhesion. Indeed, the current demand to replace non-natural and hazardous polymers by greener ones is well present in the adhesive field and open good opportunities for chitosan and its derivatives. However, chitosan is water soluble and exhibits a poor water-resistance in the field of adhesion which reduces the possibilities of its utilization within the paste field. This review focuses on exploration of different ways available to modify the chitosan and transform it into a water-resistant adhesive. The first part concerns the chitosan itself and gives important information from the discovery of chitin to the pure chitosan ready to use. The second part reviews the background information relative to adhesion theories, ideal properties of adhesives and the characteristics of chitosan as an adhesive. The last part focuses on exploration of the possible modification of chitosan to make it a water-resistant chemical adhesive.
Collapse
Affiliation(s)
- Jeanne Silvestre
- Université Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, 63000 Clermont-Ferrand, France; (J.S.); (C.D.); (P.M.)
| | - Cédric Delattre
- Université Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, 63000 Clermont-Ferrand, France; (J.S.); (C.D.); (P.M.)
- Institut Universitaire de France (IUF), 1 Rue Descartes, 75005 Paris, France
| | - Philippe Michaud
- Université Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, 63000 Clermont-Ferrand, France; (J.S.); (C.D.); (P.M.)
| | - Hélène de Baynast
- Université Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, 63000 Clermont-Ferrand, France; (J.S.); (C.D.); (P.M.)
- Correspondence: ; Tel.: +33-473-405-265
| |
Collapse
|
4
|
Dan S, Kalantari M, Kamyabi A, Soltani M. Synthesis of chitosan-g-itaconic acid hydrogel as an antibacterial drug carrier: optimization through RSM-CCD. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-021-03903-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
5
|
Paula HCB, Silva RBC, Santos CM, Dantas FDS, de Paula RCM, de Lima LRM, de Oliveira EF, Figueiredo EAT, Dias FGB. Eco-friendly synthesis of an alkyl chitosan derivative. Int J Biol Macromol 2020; 163:1591-1598. [PMID: 32791282 DOI: 10.1016/j.ijbiomac.2020.08.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 08/04/2020] [Accepted: 08/05/2020] [Indexed: 02/06/2023]
Abstract
Chitosan (CH) was N-alkylated via Schiff base formation and further reduced via sodium borohydride. The reaction was carried out at room temperature, in a homogeneous aqueous medium, using as a source of alkyl group an essential oil (Eucalyptus staigeriana) containing an unsaturated aldehyde (3,7-dimethylocta-2,6-dienal). Derivatives were characterized by Infrared Spectroscopy, proton and carbon Nuclear Magnetic Resonance, XRD, particle size distribution and zeta potential. Chitosan hydrophobization evidence was given by FTIR as new bands at 2929 cm-1 due to methyl groups, along with the presence of strong band at 1580 cm-1 owing to N substitution. Moreover, carbon and proton NMR corroborated the insertion of methyl groups in chitosan backbone. The degree of substitution was found to be in the range 0.69-1.44. X-ray diffractograms revealed that the insertion of alkyl substituents in chitosan backbone led to a less crystalline material. Data from antibacterial activity revealed that chitosan and derivatives were effective against Gram-positive bacteria, whereby derivatives exhibited greater inhibitory effect than CH. Derivatives are likely candidates for use as carriers for active principles of interest of food, pharmacy and medicine.
Collapse
Affiliation(s)
- Haroldo C B Paula
- Post-Graduation in Chemistry Program, Building 940, Federal University of Ceará, Fortaleza 60455-760, Ceará, Brazil.
| | - Rudson B C Silva
- Department of Organic and Inorganic Chemistry, Building 940, Federal University of Ceará, Fortaleza 60455-760, Ceará, Brazil
| | - Clara M Santos
- Department of Organic and Inorganic Chemistry, Building 940, Federal University of Ceará, Fortaleza 60455-760, Ceará, Brazil
| | - Francisco D S Dantas
- Department of Organic and Inorganic Chemistry, Building 940, Federal University of Ceará, Fortaleza 60455-760, Ceará, Brazil
| | - Regina C M de Paula
- Department of Organic and Inorganic Chemistry, Building 940, Federal University of Ceará, Fortaleza 60455-760, Ceará, Brazil
| | - Laís R M de Lima
- Department of Organic and Inorganic Chemistry, Building 940, Federal University of Ceará, Fortaleza 60455-760, Ceará, Brazil
| | - Erick F de Oliveira
- Department of Organic and Inorganic Chemistry, Building 940, Federal University of Ceará, Fortaleza 60455-760, Ceará, Brazil
| | - Evânia A T Figueiredo
- Department of Food Science and Technology-DETAL, Building 858, Federal University of Ceará, Fortaleza 60356-000, Ceará, Brazil
| | - Flayanna G B Dias
- Department of Food Science and Technology-DETAL, Building 858, Federal University of Ceará, Fortaleza 60356-000, Ceará, Brazil
| |
Collapse
|
6
|
Fantou C, Comesse S, Renou F, Grisel M. Impact of backbone stiffness and hydrophobic chain length of modified xanthan on oil in water emulsion stabilization. Carbohydr Polym 2019; 216:352-359. [DOI: 10.1016/j.carbpol.2019.03.079] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 02/27/2019] [Accepted: 03/23/2019] [Indexed: 10/27/2022]
|
7
|
Alkyl-Chitosan-Based Adhesive: Water Resistance Improvement. Molecules 2019; 24:molecules24101987. [PMID: 31126129 PMCID: PMC6572013 DOI: 10.3390/molecules24101987] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 05/21/2019] [Accepted: 05/21/2019] [Indexed: 11/17/2022] Open
Abstract
A chemical modification by grafting alkyl chains using an octanal (C8) on chitosan was conducted with the aim to improve its water resistance for bonding applications. The chemical structure of the modified polymers was determined by NMR analyses revealing two alkylation degrees (10 and 15%). In this study, the flow properties of alkyl-chitosans were also evaluated. An increase in the viscosity was observed in alkyl-chitosan solutions compared with solutions of the same concentration based on native chitosan. Moreover, the evaluation of the adhesive strength (bond strength and shear stress) of both native and alkyl-chitosans was performed on two different double-lap adherends (aluminum and wood). Alkyl-chitosans (10 and 15%) maintain sufficient adhesive properties on wood and exhibit better water resistance compared to native chitosan.
Collapse
|
8
|
Zuñiga A, Forte Nerán R, Albertengo L, Rodríguez MS. Synthesis, characterization and evaluation of reactional parameters on substitution degree of N-hexyl-N-methylene phosphonic chitosan. Carbohydr Polym 2018; 202:1-10. [DOI: 10.1016/j.carbpol.2018.08.126] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 08/22/2018] [Accepted: 08/28/2018] [Indexed: 11/15/2022]
|
9
|
Wang X, Guan J, Zhuang X, Li Z, Huang S, Yang J, Liu C, Li F, Tian F, Wu J, Shu Z. Exploration of Blood Coagulation of N-Alkyl Chitosan Nanofiber Membrane in Vitro. Biomacromolecules 2018; 19:731-739. [PMID: 29309730 DOI: 10.1021/acs.biomac.7b01492] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
N-Alkylated chitosan (NACS) may improve the blood clotting efficiency of chitosan (CS). To study its blood coagulation capability, a series of NACSs with various carbon chain lengths and degrees of substitution (DS) of alkyl groups were synthesized and characterized by FTIR, NMR, elemental analysis, and X-ray diffraction (XRD). The corresponding NACS nanofiber membranes (NACS-NM) were subsequently fabricated by electronic spinning technique. SEM, XRD, DSC, surface area, porosity, contact angle, blood absorption, and mechanical properties were used to characterize the CS-NM/NACS-NM. Moreover, cytotoxicity, coagulation, activated partial thromboplastin time, plasma prothrombin time, thrombin time, and platelet aggregation tests were performed to evaluate the biocompatibility and blood coagulation properties of NACS-NM. The results showed that NACS-NM was not cytotoxic. NACS-NM with DS of 19.25% for N-hexane CS (CS6b), 17.87% for N-dodecane CS (CS12b), and 8.97% for N-octadecane CS (CS18a) exhibited good blood clotting performance. Moreover, NACS-NMs favored the activation of coagulation factors and platelets. In addition, intracellular Ca2+ was not related to platelet activation. The above results suggested that NACS-NM would be an effective hemostatic agent.
Collapse
Affiliation(s)
- Xiaoyan Wang
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China.,Department of Textile , Tianjin Polytechnic University , No. 399 Binshui West Road , Xiqing District, Tianjin 300387 , China
| | - Jing Guan
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China
| | - Xupin Zhuang
- Department of Textile , Tianjin Polytechnic University , No. 399 Binshui West Road , Xiqing District, Tianjin 300387 , China
| | - Zhihong Li
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China
| | - Shujie Huang
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China
| | - Jian Yang
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China
| | - Changjun Liu
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China
| | - Fan Li
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China
| | - Feng Tian
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China
| | - Jimin Wu
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China
| | - Zhan Shu
- Key laboratory of Medical Equipment , Academy of Military Medical Sciences , No. 106 Wandong Road , Hedong District, Tianjin 300161 , China
| |
Collapse
|
10
|
Wiącek AE, Gozdecka A, Jurak M. Physicochemical Characteristics of Chitosan–TiO2 Biomaterial. 1. Stability and Swelling Properties. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.7b04257] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Agnieszka E. Wiącek
- Department of Interfacial
Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
| | - Agata Gozdecka
- Department of Interfacial
Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
| | - Małgorzata Jurak
- Department of Interfacial
Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
| |
Collapse
|
11
|
Hybrid films of chitosan, cellulose nanofibrils and boric acid: Flame retardancy, optical and thermo-mechanical properties. Carbohydr Polym 2017; 177:13-21. [PMID: 28962751 DOI: 10.1016/j.carbpol.2017.08.116] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Revised: 07/16/2017] [Accepted: 08/27/2017] [Indexed: 11/22/2022]
Abstract
Chitosan (CS), cellulose nanofibrils (CNF) and boric acid, the latter of which was used as flame retardant, were combined in transparent, hybrid films that were produced by solvent casting. The flammability and the thermal stability of the films were studied with respect to the loading of the inorganic component. Chitosan films displayed fire retardancy properties, which were enhanced in the presence of boric acid. CNF films, in contrast to those from chitosan, were readily flammable; however, when combined with boric acid (30w%), they became self-extinguishing. Most remarkably, bicomponent films comprising CNF and chitosan, displayed better fire retardancy than that of neat CS films. Moreover, boric acid improved the thermal stability of the bicomponent films. The tensile strength and Young's modulus of CS, CNF and CS-CNF films improved at intermediate boric acid addition, although a negative effect on elongation was observed.
Collapse
|
12
|
Zammali M, Mahjoub H, Hanafi M, Ducouret G, Othman T, Narita T. A microrheological study of physical gelation of hydrophobically modified associating polymers: Effects of temperature. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.06.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
13
|
|
14
|
Chiappisi L, Gradzielski M. Co-assembly in chitosan-surfactant mixtures: thermodynamics, structures, interfacial properties and applications. Adv Colloid Interface Sci 2015; 220:92-107. [PMID: 25865361 DOI: 10.1016/j.cis.2015.03.003] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 03/23/2015] [Accepted: 03/23/2015] [Indexed: 01/23/2023]
Abstract
In this review, different aspects characterizing chitosan-surfactant mixtures are summarized and compared. Chitosan is a bioderived cationic polysaccharide that finds wide-ranged applications in various field, e.g., medical or food industry, in which synergistic effects with surfactant can play a fundamental role. In particular, the behavior of chitosan interacting with strong and weak anionic, nonionic as well as cationic surfactants is reviewed. We put a focus on oppositely charged systems, as they exhibit the most interesting features. In that context, we discuss the thermodynamic description of the interaction and in particular the structural changes as they occur as a function of the mixed systems and external parameters. Moreover, peculiar properties of chitosan coated phospholipid vesicles are summarized. Finally, their co-assembly at interfaces is briefly reviewed. Despite the behavior of the mentioned systems might strongly differ, resulting in a high variety of properties, few general rules can be pointed out which improve the understanding of such complex systems.
Collapse
|
15
|
Petit C, Reynaud S, Desbrieres J. Amphiphilic derivatives of chitosan using microwave irradiation. Toward an eco-friendly process to chitosan derivatives. Carbohydr Polym 2015; 116:26-33. [DOI: 10.1016/j.carbpol.2014.04.083] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 04/08/2014] [Accepted: 04/21/2014] [Indexed: 11/26/2022]
|
16
|
Deng Q, Li H, Cao X, Yang Y, Song X, Li Y. Synergistic mechanism between laurel alkanolamide and hydrophobically associating polyacrylamide in solutions with high salinity. RSC Adv 2015. [DOI: 10.1039/c4ra14884c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The hydrophobic interaction between laurel alkanolamide micelles and hydrophobically associating polyacrylamide enhances the formation of network structure and the viscosity of the mixed solution increases in a large electrolyte concentration range.
Collapse
Affiliation(s)
- Quanhua Deng
- Key Laboratory for Colloid and Interface Chemistry of Education Ministry
- Shandong University
- Jinan 250100
- P.R. China
| | - Haiping Li
- National Engineering Technology Research Center for Colloidal Materials
- Shandong University
- Jinan 250100
- P.R. China
| | - Xulong Cao
- Geological Scientific Research Institute
- Shengli Oilfield
- Dongying 257015
- P.R. China
| | - Yong Yang
- Geological Scientific Research Institute
- Shengli Oilfield
- Dongying 257015
- P.R. China
| | - Xinwang Song
- Geological Scientific Research Institute
- Shengli Oilfield
- Dongying 257015
- P.R. China
| | - Ying Li
- Key Laboratory for Colloid and Interface Chemistry of Education Ministry
- Shandong University
- Jinan 250100
- P.R. China
| |
Collapse
|
17
|
Abstract
Abstract
Polysaccharides are a natural and renewable feed stock for synthesizing high performance macromolecular materials. However, their structure does not allow reaching all properties required for specific applications and chemical modifications are necessary to reach such objectives. Despite the use of natural polymers, the chemistry and processes employed are not environment-friendly due to the nature of chemicals, solvents or because the conventional chemical process are energy-consuming. On the other hand, microwave assisted processes were developed in organic chemistry since the 1980s and more recently for polymer chemistry (polymer formation and modification). Within the chemistry of natural polymers, the use of microwave irradiation has been exploited in the past two decades to alleviate limitations in the synthesis of graft modified polysaccharide materials. Microwave heating is described as more homogeneous, selective and efficient as compared to conventional heating resulting in faster reactions with fewer or no side products as example. Different results reported within the recent literature will be discussed considering the role of microwave irradiation and its consequence on the reaction parameters and properties of final materials. Grafting of polysaccharides, specific modification of polysaccharides or fibers particularly for preparing smart textiles or medical products as well as reactions of polysaccharides to valuable bio-platform molecule will be discussed.
Collapse
|
18
|
Yang Y, Wang S, Wang Y, Wang X, Wang Q, Chen M. Advances in self-assembled chitosan nanomaterials for drug delivery. Biotechnol Adv 2014; 32:1301-1316. [PMID: 25109677 DOI: 10.1016/j.biotechadv.2014.07.007] [Citation(s) in RCA: 188] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 06/24/2014] [Accepted: 07/30/2014] [Indexed: 02/06/2023]
Abstract
Nanomaterials based on chitosan have emerged as promising carriers of therapeutic agents for drug delivery due to good biocompatibility, biodegradability, and low toxicity. Chitosan originated nanocarriers have been prepared by mini-emulsion, chemical or ionic gelation, coacervation/precipitation, and spray-drying methods. As alternatives to these traditional fabrication methods, self-assembled chitosan nanomaterials show significant advantages and have received growing scientific attention in recent years. Self-assembly is a spontaneous process by which organized structures with particular functions and properties could be obtained without additional complicated processing or modification steps. In this review, we focus on recent progress in the design, fabrication and physicochemical aspects of chitosan-based self-assembled nanomaterials. Their applications in drug delivery of different therapeutic agents are also discussed in details.
Collapse
Affiliation(s)
- Yu Yang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Shengpeng Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Yitao Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Xiaohui Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Qun Wang
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA; Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA 50011, USA.
| | - Meiwan Chen
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China.
| |
Collapse
|
19
|
Rheological and antioxidant power studies of enzymatically grafted chitosan with a hydrophobic alkyl side chain. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2013.12.030] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
20
|
Deng Q, Li H, Li Y, Cao X, Yang Y, Song X. Rheological Properties and Salt Resistance of a Hydrophobically Associating Polyacrylamide. Aust J Chem 2014. [DOI: 10.1071/ch14204] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The rheological properties of electrolyte solution of a hydrophobically associating acrylamide-based copolymer (HA-PAM) containing hydrophobically modified monomer and sodium 2-acrylamido-2-methylpropanesulfonic sulfonate were investigated in this paper. The study mainly focussed on effects of electrolyte concentration, temperature, and shear rate on the solution rheological properties. HA-PAM exhibited much stronger salt tolerance and shearing resistance than the commonly used partially hydrolyzed polyacrylamide, and has great potential for application in tertiary oil recovery of oilfields with high salinity. The salt resistance mechanism of HA-PAM in solution was investigated by combining molecular simulation and experimental methods. The structure–performance relationship of the salt-resisting polymer may provide useful guidance for design and synthesis of novel water-soluble polymers with high salt resistance.
Collapse
|
21
|
Alginate grafted with poly(ε-caprolactone): effect of enzymatic degradation on physicochemical properties. POLYM INT 2012. [DOI: 10.1002/pi.4232] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
22
|
Sanoop PK, Mahesh KV, Nampoothiri KM, Mangalaraja RV, Ananthakumar S. Multifunctional ZnO-biopolymer nanocomposite coatings for health-care polymer foams and fabrics. J Appl Polym Sci 2012. [DOI: 10.1002/app.36831] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
23
|
Laufer G, Kirkland C, Cain AA, Grunlan JC. Clay-chitosan nanobrick walls: completely renewable gas barrier and flame-retardant nanocoatings. ACS APPLIED MATERIALS & INTERFACES 2012; 4:1643-9. [PMID: 22339671 DOI: 10.1021/am2017915] [Citation(s) in RCA: 171] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Thin films prepared via a layer-by-layer (LbL) assembly of renewable materials exhibit exceptional oxygen barrier and flame-retardant properties. Positively charged chitosan (CH), at two different pH levels (pH 3 and pH 6), was paired with anionic montmorillonite (MMT) clay nanoplatelets. Thin-film assemblies prepared with CH at high pH are thicker, because if the low polymer charge density. A 30-bilayer (CH pH 6-MMT) nanocoating (~100 nm thick) reduces the oxygen permeability of a 0.5-mm-thick polylactic acid film by four orders of magnitude. This same coating system completely stops the melting of a flexible polyurethane foam, when exposed to direct flame from a butane torch, with just 10 bilayers (~30 nm thick). Cone calorimetry confirms that this coated foam exhibited a reduced peak heat-release rate, by as much as 52%, relative to the uncoated control. These environmentally benign nanocoatings could prove beneficial for new types of food packaging or a replacement for environmentally persistent antiflammable compounds.
Collapse
Affiliation(s)
- Galina Laufer
- Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843, USA
| | | | | | | |
Collapse
|
24
|
Lupu M, Macocinschi D, Epure V, Ioanid A, Grigoras CV, Ioan S. Micellization Process in Poly(Ether Urethane) Solutions. J MACROMOL SCI B 2011. [DOI: 10.1080/00222340600639670] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Mihaela Lupu
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
| | - Doina Macocinschi
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
| | - Virginia Epure
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
| | - Aurelia Ioanid
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
| | | | - Silvia Ioan
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
| |
Collapse
|
25
|
Cruz M, Freitas F, Torres CA, Reis MA, Alves VD. Influence of temperature on the rheological behavior of a new fucose-containing bacterial exopolysaccharide. Int J Biol Macromol 2011; 48:695-9. [DOI: 10.1016/j.ijbiomac.2011.02.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 02/15/2011] [Accepted: 02/21/2011] [Indexed: 10/18/2022]
|
26
|
Mocanu G, Mihai D, Dulong V, Picton L, Lecerf D. New anionic amphiphilic thermosensitive pullulan derivatives. Carbohydr Polym 2011. [DOI: 10.1016/j.carbpol.2010.11.034] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
27
|
Payet L, Ponton A, Grossiord JL, Agnely F. Structural and rheological properties of chitosan semi-interpenetrated networks. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2010; 32:109-118. [PMID: 20526647 DOI: 10.1140/epje/i2010-10602-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 05/04/2010] [Indexed: 05/29/2023]
Abstract
The local structure and the viscoelastic properties of semi-interpenetrated biopolymer networks based on cross-linked chitosan and poly(ethylene oxide) (PEO) were investigated by Small Angle Neutron Scattering and rheological measurements. The specific viscosity and the entanglement concentration of chitosan were first determined, respectively, by capillary viscosimetry and steady-state shear rheology experiments performed at different polymer concentrations. Mechanical spectroscopy was then used to study the gelation process of chitosan/PEO semi-interpenetrated networks. By fitting the frequency dependence of the elastic and loss moduli with extended relations of relaxation shear modulus around the sol-gel transition, it was shown that the addition of PEO chains had a significant effect on the viscoelastic properties of aqueous chitosan networks but no effect on the gelation time. The improvement of mechanical properties was in accordance with the correlation length decrease deduced from Small Angle Neutron Scattering experiments.
Collapse
Affiliation(s)
- L Payet
- Matière et Systèmes Complexes UMR 7057 CNRS & Université Paris Diderot-Paris 7, Paris, France
| | | | | | | |
Collapse
|
28
|
Sajomsang W. Synthetic methods and applications of chitosan containing pyridylmethyl moiety and its quaternized derivatives: A review. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2009.12.037] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
29
|
Ghimici L, Bercea M, Dragan ES. Rheological Behavior of Some Cationic Polyelectrolytes. J MACROMOL SCI B 2009. [DOI: 10.1080/00222340903035618] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Luminita Ghimici
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
| | - Maria Bercea
- a “Petru Poni” Institute of Macromolecular Chemistry , Iasi, Romania
| | | |
Collapse
|
30
|
|
31
|
Liang S, Liu L, Huang Q, Yam KL. Unique Rheological Behavior of Chitosan-Modified Nanoclay at Highly Hydrated State. J Phys Chem B 2009; 113:5823-8. [DOI: 10.1021/jp8107304] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Songmiao Liang
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, Eastern Regional Research Center, United States Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038
| | - Linshu Liu
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, Eastern Regional Research Center, United States Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038
| | - Qingrong Huang
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, Eastern Regional Research Center, United States Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038
| | - Kit L. Yam
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, Eastern Regional Research Center, United States Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038
| |
Collapse
|
32
|
Chitosan derivatives with thickening properties obtained by reductive alkylation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2009. [DOI: 10.1016/j.msec.2008.11.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
33
|
Ghimici L, Nichifor M. Transport properties of some cationic amphiphilic polysaccharides: Effects of the side-chain length and solvent polarity. J Appl Polym Sci 2009. [DOI: 10.1002/app.29370] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
34
|
Durand A. Viscosity of dilute colloidal dispersions involving polysaccharide-based stabilizers. Colloid Polym Sci 2008. [DOI: 10.1007/s00396-008-1923-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
35
|
Synthesis and characterization of N-aryl chitosan derivatives. Int J Biol Macromol 2008; 43:79-87. [DOI: 10.1016/j.ijbiomac.2008.03.010] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2008] [Revised: 03/10/2008] [Accepted: 03/25/2008] [Indexed: 11/18/2022]
|
36
|
Bonacucina G, Cespi M, Misici-Falzi M, Palmieri GF. Rheological evaluation of silicon/carbopol hydrophilic gel systems as a vehicle for delivery of water insoluble drugs. AAPS JOURNAL 2008; 10:84-91. [PMID: 18446508 DOI: 10.1208/s12248-008-9008-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2007] [Accepted: 01/02/2008] [Indexed: 11/30/2022]
Abstract
The present study analyzed the thickening properties of Carbopol 974 and 971 in a 50:50 mixture of water/Silsense A-21, a new cationic silicon miscible in any proportion with water. Samples were prepared by simply dispersing different Carbopol amounts (0.5-4%) at room temperature or at 70 degrees C without neutralizing. Temperature sweep and time sweep analysis did not reveal significant structural changes at increasing temperature in the samples prepared following the first procedure. On the other hand systems obtained at 70 degrees C possessed higher elastic character particularly at polymer concentration higher than 2% (w/v). Analysis of the G' and G'' vs frequency curves by using different fitting equations (linear fitting, power law) gave information about the viscoelastic properties of the systems. The fitting of the frequency spectra and the calculation of the relaxation times from the master curves outlined the structural differences within the samples prepared with the two different procedures, confirming stronger gel-like behaviour for the samples prepared by the heating procedure. High preparation temperature promoted the polymer-solvent interactions, aiding the solvation of Carbopol. Heating facilitated polymer-solvent and polymer-polymer interaction, giving rise to a better organised structure typical of gel-like systems. Furthermore this preparation method provided good stability properties as shown by the stress sweeps tests performed during the three months of storage. The interpretation of the rheological results was supported by statistical analysis. A design methodology (screening and optimisation) was also applied in order evaluate the influence on dynamic rheological moduli of several parameters (polymer type and concentration, preparation method, temperature of the tests). This last method showed the relevance of the interaction of two main factors: polymer concentration and preparation procedure. Thus, statistical analysis confirmed that temperature increased the polymer-solvent interaction and improved the viscoelastic properties of the systems, particularly when Carbopols were present in considerable amounts.
Collapse
Affiliation(s)
- Giulia Bonacucina
- Department of Chemical Sciences, University of Camerino, via S. Agostino 1, 62032 Camerino, Italy
| | | | | | | |
Collapse
|
37
|
Charlot A, Auzély-Velty R. Novel Hyaluronic Acid Based Supramolecular Assemblies Stabilized by Multivalent Specific Interactions: Rheological Behavior in Aqueous Solution. Macromolecules 2007. [DOI: 10.1021/ma071631h] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aurélia Charlot
- Centre de Recherches sur les Macromolécules Végétales (CERMAV−CNRS), affiliated with Université Joseph Fourier and member of the Institut de Chimie Moléculaire de Grenoble, BP53, 38041 Grenoble Cedex 9, France
| | - Rachel Auzély-Velty
- Centre de Recherches sur les Macromolécules Végétales (CERMAV−CNRS), affiliated with Université Joseph Fourier and member of the Institut de Chimie Moléculaire de Grenoble, BP53, 38041 Grenoble Cedex 9, France
| |
Collapse
|
38
|
From polymeric surfactants to colloidal systems (3): Neutral and anionic polymeric surfactants derived from dextran. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2006.12.062] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
39
|
Hu Y, Du Y, Yang J, Tang Y, Li J, Wang X. Self-aggregation and antibacterial activity of N-acylated chitosan. POLYMER 2007. [DOI: 10.1016/j.polymer.2007.03.063] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
40
|
Durand A. Aqueous solutions of amphiphilic polysaccharides: Concentration and temperature effect on viscosity. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2007.02.031] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
41
|
Ioan S, Lupu M, Epure V, Ioanid A, Macocinschi D. Macromolecular assemblies of segmented poly(ester urethane)s and poly(ether urethane)s. J Appl Polym Sci 2007. [DOI: 10.1002/app.24562] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
42
|
Durand A. Semiempirical equations for the viscosity of amphiphilic polymer solutions: A critical examination. POLYM ENG SCI 2007. [DOI: 10.1002/pen.20722] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
43
|
Chemical modification of chitosan: synthesis and biological activity of new heterocyclic chitosan derivatives. POLYM INT 2007. [DOI: 10.1002/pi.2333] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
44
|
Rotureau E, Leonard M, Marie E, Dellacherie E, Camesano T, Durand A. From polymeric surfactants to colloidal systems (1): Amphiphilic dextrans for emulsion preparation. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2006.01.044] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
45
|
Rotureau E, Dellacherie E, Durand A. Viscosity of aqueous solutions of polysaccharides and hydrophobically modified polysaccharides: Application of Fedors equation. Eur Polym J 2006. [DOI: 10.1016/j.eurpolymj.2005.11.019] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
46
|
New associative systems based on alkylated hyaluronic acid. Synthesis and aqueous solution properties. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.02.052] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
47
|
Bonacucina G, Palmieri GF. Acrylic polymers as thickening agents for tetraglycol cosolvent. J Pharm Sci 2006; 95:726-36. [PMID: 16435364 DOI: 10.1002/jps.20567] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
This article evaluated the thickening properties of two different Eudragits, L and RS, in tetraglycol cosolvent in order to obtain high viscosity systems characterized by controlled release properties. Tetraglycol was chosen for its ability to dissolve a wide range of water insoluble drugs, while Eudragit RS and L for their specific dissolution and permeability properties under physiological conditions. Study of the rheological properties was performed to characterize elastic and viscous properties of Eudragit/tetraglycol samples in function of frequency and temperature. For all systems, the results outlined a liquid like behavior, as observed for dilute polymer solutions. In fact the fitting of the log G'-log G'' versus frequency curves showed a good agreement with the Rouse or Zimm models. So despite the increase in viscosity, samples still behaved like liquid systems. After the addition of paracetamol the release characteristics were defined pointing out the great release control properties of both Eudragit L and RS, which showed different release kinetics depending on the pH of the environment. Semisolid Eudragits/tetraglycol systems can be considered as a new alterative for the sustained release of insoluble or poorly water-soluble drugs.
Collapse
Affiliation(s)
- Giulia Bonacucina
- University of Camerino, Department of Chemical Sciences, via S. Agostino 1, 62032 Camerino, Italy
| | | |
Collapse
|
48
|
Zhu C, Lee JH, Raghavan SR, Payne GF. Bioinspired vesicle restraint and mobilization using a biopolymer scaffold. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:2951-5. [PMID: 16548539 DOI: 10.1021/la053475i] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Biology employs vesicles to package molecules (e.g., neurotransmitters) for their targeted delivery in response to specific spatiotemporal stimuli. Biology is also capable of employing localized stimuli to exert an additional control on vesicle trafficking; intact vesicles can be restrained (or mobilized) by association with (or release from) a cytoskeletal scaffold. We mimic these capabilities by tethering vesicles to a biopolymer scaffold that can undergo (i) stimuli-responsive network formation (for vesicle restraint) and (ii) enzyme-catalyzed network cleavage (for vesicle mobilization). Specifically, we use the aminopolysaccharide chitosan as our scaffold and graft a small number of hydrophobic moieties onto its backbone. These grafted hydrophobes can insert into the bilayer to tether vesicles to the scaffold. Under acidic conditions, the vesicles are not restrained by the hydrophobically modified chitosan (hm-chitosan) because this scaffold is soluble. Increasing the pH to neutral or basic conditions allows chitosan to form interpolymer associations that yield a strong, insoluble restraining network. Enzymatic hydrolysis of this scaffold by chitosanase cleaves the network and mobilizes intact vesicles. Potentially, this approach will provide a controllable means to store and liberate vesicle-based reagents/therapeutics for microfluidic/medical applications.
Collapse
Affiliation(s)
- Chao Zhu
- Center for Biosystems Research, University of Maryland Biotechnology Institute, College Park, Maryland 20742, USA
| | | | | | | |
Collapse
|
49
|
Durand A, Dellacherie E. Aqueous Solutions of Native and Hydrophobically Modified Polysaccharides: Temperature Effect. Biomacromolecules 2006; 7:958-64. [PMID: 16529437 DOI: 10.1021/bm0509063] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Amphiphilic polysaccharides, obtained by the attachment of various hydrocarbon groups onto dextran, are studied in aqueous solutions. The viscosity of their aqueous solutions is examined as a function of concentration and temperature in the range 25-65 degrees C. Varying polymer concentration, viscosity follows a polynomial development of Huggins equation in which the coefficients can be calculated from the Huggins constant determined in the dilute domain (Matsuoka-Cowman equation). For all polymers, the solution viscosity follows an Arrhenius-like variation with temperature. The activation energy of the aqueous solutions is determined as a function of polymer concentration and structural characteristics (nature and amount of grafted hydrocarbon groups). The variation of activation energy with polymer concentration is shown to be consistent with predictions based on the Matsuoka-Cowman equation combined with the equation of Andrade. This conclusion is extended to other polysaccharides using data from the literature.
Collapse
Affiliation(s)
- A Durand
- Laboratoire de Chimie Physique Macromoléculaire, UMR CNRS-INPL 7568, Groupe ENSIC, BP 20451, 54001 Nancy Cedex, France.
| | | |
Collapse
|
50
|
Bonacucina G, Cespi M, Misici-Falzi M, Palmieri GF. Rheological, adhesive and release characterisation of semisolid Carbopol/tetraglycol systems. Int J Pharm 2006; 307:129-40. [PMID: 16297581 DOI: 10.1016/j.ijpharm.2005.09.034] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2005] [Revised: 08/30/2005] [Accepted: 09/12/2005] [Indexed: 11/16/2022]
Abstract
Gels dosage forms are successfully used as drug delivery systems considering their ability to control drug release and to protect medicaments from an hostile environment. This study deals with the gelation properties of Carbopol 971 e 974 polymeric systems in tetraglycol, a water-miscible cosolvent. In this paper, the attention was noted of the thickening properties of the different Carbopol in tetraglycol solvent at increasing temperatures, in order to obtain gels avoiding neutralisation and, at the same time, to make possible the dissolution in these gels of insoluble or poorly soluble water drugs. Samples were prepared by simply dispersing different Carbopols amount (0.5-4%) were added to tetraglycol and different systems were prepared at room temperature and by heating at 70 degrees C. All these systems were then characterised rheologically. Frequency sweep, creep-recovery, temperature sweep and time sweep analyses outlined that Carbopol 971 and 974 in tetraglycol gave rise after heating to gels with satisfactory rheological behaviour: the elastic modulus was greater than the viscous one and a remarkable elastic character was found to be present. Systems obtained by heating procedure were examined also from a mechanical point of view using a texture profile analysis. Besides, being Carbopols well known mucoadhesive polymers, gels adhesive properties were also studied using the ex vivo method. Texture and adhesion characterisation confirmed rheological results pointing out a certain greater elasticity and adhesiveness of Carbopol 974 systems. Then, the possible cutaneous irritation was also tested using the in vivo method (Draize test). No signs of cutaneous irritation were obtained for all the samples that were analysed. After rheological and mucoadhesive properties were set, paracetamol as a model drug was inserted in the composition of the gels and the release characteristics were defined. Dissolution tests pointed out the greater release control properties of tetraglycol/Carbopol 971 samples. These studies showed tetraglycol/Carbopol systems as a first-rate alternative to traditional water gels when low water-soluble drugs have to be added.
Collapse
Affiliation(s)
- Giulia Bonacucina
- University of Camerino, Department of Chemical Sciences, via S. Agostino 1, 62032 Camerino, Italy
| | | | | | | |
Collapse
|