51
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Dai Y, Yan H, Zhang B, Wu W, Yang L, Li S, Li W, Li H, Yan L, Shan D, Feng Y, Terui N, Tanaka S. A novel adsorbent obtained by caging activated carbon by konjac glucomannan gel for elimination of organic compounds. J Appl Polym Sci 2014. [DOI: 10.1002/app.40542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yingjie Dai
- Laboratory of Environmental Remediation; School of Resources Environment; Northeast Agricultural University; Harbin 150030 China
- State Key Laboratory of Urban Water Resource and Environment; Harbin Institute of Technology; Harbin 150090 China
- Key Laboratory of National Education Department; Soybean Research Institute; Northeast Agricultural University; Harbin 150030 China
| | - Hong Yan
- College of Chemistry and Environmental Engineering; Harbin University of Science and Technology, Key Laboratory of Green Chemical Technology of College of Heilongjiang Province; Harbin 150080 China
| | - Binbin Zhang
- Key Laboratory of National Education Department; Soybean Research Institute; Northeast Agricultural University; Harbin 150030 China
| | - Wenting Wu
- Laboratory of Environmental Remediation; School of Resources Environment; Northeast Agricultural University; Harbin 150030 China
| | - Liqiong Yang
- School of Biology and Environment Engineering; Shenyang University; Shenyang 110044 China
| | - Shufeng Li
- College of Life Science; Northeast Agricultural University; Harbin 150030 China
| | - Wenbin Li
- Key Laboratory of National Education Department; Soybean Research Institute; Northeast Agricultural University; Harbin 150030 China
| | - Hongtao Li
- Laboratory of Environmental Remediation; School of Resources Environment; Northeast Agricultural University; Harbin 150030 China
| | - Lilong Yan
- Laboratory of Environmental Remediation; School of Resources Environment; Northeast Agricultural University; Harbin 150030 China
| | - Dexin Shan
- Laboratory of Environmental Remediation; School of Resources Environment; Northeast Agricultural University; Harbin 150030 China
| | - Yujie Feng
- State Key Laboratory of Urban Water Resource and Environment; Harbin Institute of Technology; Harbin 150090 China
| | - Norifumi Terui
- Ichinoseki National College of Technology; Ichinoseki 021-8511 Japan
| | - Shunitz Tanaka
- Graduate School of Environmental Earth Science; Hokkaido University; Sapporo 060-0810 Japan
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52
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Wang S, Wu X, Wang Y, Li Y, Wang L, Chen Y, Li B. Dissolution behavior of deacetylated konjac glucomannan in aqueous potassium thiocyanate solution at low temperature. RSC Adv 2014. [DOI: 10.1039/c4ra01491j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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53
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Wang S, Zhan Y, Wu X, Ye T, Li Y, Wang L, Chen Y, Li B. Dissolution and rheological behavior of deacetylated konjac glucomannan in urea aqueous solution. Carbohydr Polym 2014; 101:499-504. [DOI: 10.1016/j.carbpol.2013.09.090] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 09/13/2013] [Accepted: 09/24/2013] [Indexed: 11/16/2022]
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54
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Zheng K, Zhang J, Cheng J. Morphology, Structure, Miscibility, and Properties of Wholly Soy-Based Semi-interpenetrating Polymer Networks from Soy–Oil–Polyol-Based Polyurethane and Modified Soy Protein Isolate. Ind Eng Chem Res 2013. [DOI: 10.1021/ie401791v] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kaiwen Zheng
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry
of Education, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Junying Zhang
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry
of Education, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Jue Cheng
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry
of Education, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
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55
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KGM and PMAA based pH-sensitive interpenetrating polymer network hydrogel for controlled drug release. Carbohydr Polym 2013; 97:565-70. [DOI: 10.1016/j.carbpol.2013.05.007] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2013] [Revised: 05/01/2013] [Accepted: 05/07/2013] [Indexed: 11/22/2022]
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56
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Percolation and gel-like behavior of multiwalled carbon nanotube/polypropylene composites influenced by nanotube aspect ratio. POLYMER 2013. [DOI: 10.1016/j.polymer.2012.12.058] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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57
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58
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Influence of measurement temperature on the rheological and microstructural properties of glucomannan gels with different thermal histories. Food Res Int 2012. [DOI: 10.1016/j.foodres.2012.07.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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59
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Shi X, Lu A, Cai J, Zhang L, Zhang H, Li J, Wang X. Rheological Behaviors and Miscibility of Mixture Solution of Polyaniline and Cellulose Dissolved in an Aqueous System. Biomacromolecules 2012; 13:2370-8. [DOI: 10.1021/bm3006243] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xingwei Shi
- Department of Chemistry, Wuhan University, 430072, China
| | - Ang Lu
- Department of Chemistry, Wuhan University, 430072, China
| | - Jie Cai
- Department of Chemistry, Wuhan University, 430072, China
| | - Lina Zhang
- Department of Chemistry, Wuhan University, 430072, China
| | - Hongming Zhang
- Key Lab of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, China
| | - Ji Li
- Key Lab of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, China
| | - Xianhong Wang
- Key Lab of Polymer
Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, China
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60
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Alissandratos A, Halling PJ. Enzymatic acylation of starch. BIORESOURCE TECHNOLOGY 2012; 115:41-47. [PMID: 22138593 DOI: 10.1016/j.biortech.2011.11.030] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Revised: 11/02/2011] [Accepted: 11/06/2011] [Indexed: 05/31/2023]
Abstract
Starch a cheap, abundant and renewable natural material has been chemically modified for many years. The popular modification acylation has been used to adjust rheological properties as well as deliver polymers with internal plasticizers and other potential uses. However the harsh reaction conditions required to produce these esters may limit their use, especially in sensitive applications (foods, pharmaceuticals, etc.). The use of enzymes to catalyse acylation may provide a suitable alternative due to high selectivities and mild reaction conditions. Traditional hydrolase-catalysed synthesis in non-aqueous apolar media is hard due to lack of polysaccharide solubility. However, acylated starch derivatives have recently been successfully produced in other non-conventional systems: (a) surfactant-solubilised subtilisin and suspended amylose in organic media; (b) starch nanoparticles dispersed in organic medium with immobilised lipase; (c) aqueous starch gels with lipase and dispersed fatty acids. We attempt a systematic review that draws parallels between the seemingly unrelated approaches described.
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61
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Liu JY, Wang HC, Yin Y, Li N, Cai PL, Yang SL. Controlled acetylation of water-soluble glucomannan from Bletilla striata. Carbohydr Polym 2012; 89:158-62. [DOI: 10.1016/j.carbpol.2012.02.065] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 02/17/2012] [Accepted: 02/24/2012] [Indexed: 10/28/2022]
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62
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Effect of degree of deacetylation on physicochemical and gelation properties of konjac glucomannan. Food Res Int 2012. [DOI: 10.1016/j.foodres.2011.12.015] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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63
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Chua M, Chan K, Hocking TJ, Williams PA, Perry CJ, Baldwin TC. Methodologies for the extraction and analysis of konjac glucomannan from corms of Amorphophallus konjac K. Koch. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.10.053] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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64
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Tatirat O, Charoenrein S, Kerr WL. Physicochemical properties of extrusion-modified konjac glucomannan. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.09.052] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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65
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Synthesis of cyanoethyl konjac glucomannan and its liquid crystalline behavior in an ionic liquid. JOURNAL OF POLYMER RESEARCH 2011. [DOI: 10.1007/s10965-011-9758-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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66
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Tatirat O, Charoenrein S. Physicochemical properties of konjac glucomannan extracted from konjac flour by a simple centrifugation process. Lebensm Wiss Technol 2011. [DOI: 10.1016/j.lwt.2011.07.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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67
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Alissandratos A, Baudendistel N, Flitsch SL, Hauer B, Halling PJ. Lipase-catalysed acylation of starch and determination of the degree of substitution by methanolysis and GC. BMC Biotechnol 2010; 10:82. [PMID: 21114817 PMCID: PMC3006361 DOI: 10.1186/1472-6750-10-82] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Accepted: 11/29/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Natural polysaccharides such as starch are becoming increasingly interesting as renewable starting materials for the synthesis of biodegradable polymers using chemical or enzymatic methods. Given the complexity of polysaccharides, the analysis of reaction products is challenging. RESULTS Esterification of starch with fatty acids has traditionally been monitored by saponification and back-titration, but in our experience this method is unreliable. Here we report a novel GC-based method for the fast and reliable quantitative determination of esterification. The method was used to monitor the enzymatic esterification of different starches with decanoic acid, using lipase from Thermomyces lanuginosus. The reaction showed a pronounced optimal water content of 1.25 mL per g starch, where a degree of substitution (DS) of 0.018 was obtained. Incomplete gelatinization probably accounts for lower conversion with less water. CONCLUSIONS Lipase-catalysed esterification of starch is feasible in aqueous gel systems, but attention to analytical methods is important to obtain correct DS values.
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Affiliation(s)
- Apostolos Alissandratos
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, UK.
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68
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Yang L, Fu S, Zhu X, Zhang LM, Yang Y, Yang X, Liu H. Hyperbranched acidic polysaccharide from green tea. Biomacromolecules 2010; 11:3395-405. [PMID: 21028801 DOI: 10.1021/bm100902d] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An acidic tea polysaccharide (ALTPS), isolated from green tea ( Camellia sinensis ), was characterized as a hyperbranched glycoprotein containing the acidic heteropolysaccharide chains and the protein residues from the results of UV-vis, FTIR, one- and two-dimensional NMR, GC, GC-MS, and amino acid analyses. Solution properties of ALTPS were investigated by static and dynamic light scattering analyses and viscometry. The results indicated that the viscosity behavior of ALTPS exhibited a typical polyelectrolyte effect in distilled water, which may be avoided by adding salts. The low intrinsic viscosity of ALTPS in the solutions (8-15 mL/g) is attributed to its hyperbranched structure. By application of the polymer solution theory, it was revealed that ALTPS was present in a sphere-like conformation in the solutions as a result of the hyperbranched structure. The TEM image further confirmed that ALTPS existed in a spherical conformation in aqueous NaCl solution. Glucose was absorbed by ALTPS, which may be one of blood glucose lowering mechanisms of tea polysaccharides.
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Affiliation(s)
- Liqun Yang
- Institute of Polymer Science, School of Chemistry and Chemical Engineering, BME Center, State Key Laboratory of Optoelectronic Materials and Technologies, DSAPM Lab and PCFM Lab, Sun Yat-sen University, Guangzhou 510275, China.
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69
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Effect of degree of acetylation on thermoplastic and melt rheological properties of acetylated konjac glucomannan. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2010.04.053] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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70
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Lue A, Zhang L. Effects of carbon nanotubes on rheological behavior in cellulose solution dissolved at low temperature. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.03.059] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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71
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Maafi EM, Tighzert L, Malek F. Elaboration and characterization of composites of castor oil-based polyurethane and fibers from alfa stems. J Appl Polym Sci 2010. [DOI: 10.1002/app.32464] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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72
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Shen D, Wan C, Gao S. Molecular weight effects on gelation and rheological properties of konjac glucomannan-xanthan mixtures. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/polb.21890] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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73
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Kondo T, Shinozaki T, Oku H, Takigami S, Takagishi K. Konjac glucomannan-based hydrogel with hyaluronic acid as a candidate for a novel scaffold for chondrocyte culture. J Tissue Eng Regen Med 2009; 3:361-7. [PMID: 19399729 DOI: 10.1002/term.170] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Chondrocytes were cultured using konjac glucomannan (KGM) and hyaluronic acid (HA) as a scaffold for cartilage regeneration. They were subsequently compared with scaffolds produced using agarose hydrogels. Chondrocytes derived from Japanese white rabbits were cultured: 2.0 x 10(5) cells were seeded on KGM containing hyaluronic acid (KGM/HA) and agarose and cultured for 5 days. Their viability was assayed using WST-8 procedures; the ultimate stress and modulus of elasticity of each construct was calculated. After 3 days of cultivation, mRNA in chondrocytes, such as collagen types I and II and aggrecan, were measured using RT-PCR. Both chondrocyte-seeded constructs were stained with safranin O/fast green and were evaluated histologically. Chondrocyte viability decreased concomitantly with increasing KGM/HA or agarose concentration and with culture time. Cell viability in 2% agarose was significantly lower than that in 2% KGM/HA on the third and fifth days (p < 0.05). The primary elastic modulus increased concomitantly with increasing polysaccharide concentration. Elastic moduli of 2% KGM/HA with chondrocytes (0.389 +/- 0.119 N/mm(2)) showed little difference from those without chondrocytes (0.283 +/- 0.243 N/mm(2)), although those of 2% agarose with chondrocytes (0.403 +/- 0.094 N/mm(2)) were significantly lower than those without chondrocytes (0.736 +/- 0.227 N/mm(2); p < 0.05). Collagen type II mRNA expression was higher in KGM/HA and agarose than in monolayer cultures, although KGM/HA had lower aggrecan mRNA expression levels than did agarose. Histological tests of KGM/HA-chondrocyte constructs revealed chondrocyte aggregation and proteoglycan production in the pericellular region. The results show that KGM/HA might be useful for chondrocyte culture.
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Affiliation(s)
- Takayuki Kondo
- Department of Orthopaedic Surgery, Gunma University Graduate School of Medicine, Japan
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74
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Wang Y, Lue A, Zhang L. Rheological behavior of waterborne polyurethane/starch aqueous dispersions during cure. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.05.057] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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75
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Kök MS, Abdelhameed AS, Ang S, Morris GA, Harding SE. A novel global hydrodynamic analysis of the molecular flexibility of the dietary fibre polysaccharide konjac glucomannan. Food Hydrocoll 2009. [DOI: 10.1016/j.foodhyd.2009.02.002] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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76
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Wen X, Cao X, Yin Z, Wang T, Zhao C. Preparation and characterization of konjac glucomannan–poly(acrylic acid) IPN hydrogels for controlled release. Carbohydr Polym 2009. [DOI: 10.1016/j.carbpol.2009.04.001] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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77
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78
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Xu C, Willför S, Holmlund P, Holmbom B. Rheological properties of water-soluble spruce O-acetyl galactoglucomannans. Carbohydr Polym 2009. [DOI: 10.1016/j.carbpol.2008.08.016] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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79
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NISHINARI K. Texture and Rheology in Food and Health. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2009. [DOI: 10.3136/fstr.15.99] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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80
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Liu M, Fan J, Wang K, He Z. Synthesis, Characterization, and Evaluation of Phosphated Cross-Linked Konjac Glucomannan Hydrogels for Colon-Targeted Drug Delivery. Drug Deliv 2008; 14:397-402. [PMID: 17701529 DOI: 10.1080/10717540701202887] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
Hydrogel systems of konjac glucomannan (KGM) cross-linked with trisodium trimetaphosphate (STMP) were prepared for colon-targeting drug delivery. Swelling degrees of the hydrogels were measured in artificial gastrointestinal fluids and in sodium chloride solution with different concentrations to study their dependence on the cross-linking density and the ionic strength. The absorption of methylene blue was used to characterize the degree of the KGM cross-linking. In vitro release of model drug hydrocortisone was studied in presence and absence of beta -mannanase. KGM cross-linked with STMP was able to retard the release of the poorly water-soluble drug and could be biodegraded enzymatically. Hydrocortisone release was cross-linking density dependent and controlled by degradation of the hydrogles.
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Affiliation(s)
- Meimei Liu
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin, PR China
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81
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Rheological study on thermal-induced gelation behavior of polyacrylonitrile solution. JOURNAL OF POLYMER RESEARCH 2008. [DOI: 10.1007/s10965-008-9234-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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82
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83
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84
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Gao S, Wu C, Nishinari K. In situ pH-decrease-induced gelation of sodium alginate/carboxymethylated konjac glucomannan. J Appl Polym Sci 2008. [DOI: 10.1002/app.27591] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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85
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Huang Y, Fan Q, Xiao C. Miscibility and properties of semi-interpenetrating polymer networks based on polyurethane and nitroguar gum. J Appl Polym Sci 2007. [DOI: 10.1002/app.25686] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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86
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Rinaudo M. Characterization and Properties of Some Polysaccharides Used as Biomaterials. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/masy.200651379] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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87
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Alvarez-Manceñido F, Braeckmans K, De Smedt SC, Demeester J, Landin M, Martínez-Pacheco R. Characterization of diffusion of macromolecules in konjac glucomannan solutions and gels by fluorescence recovery after photobleaching technique. Int J Pharm 2006; 316:37-46. [PMID: 16574355 DOI: 10.1016/j.ijpharm.2006.02.029] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2005] [Revised: 02/14/2006] [Accepted: 02/15/2006] [Indexed: 10/24/2022]
Abstract
Konjac glucomannan (KGM) is a neutral polysaccharide with interesting properties as gelling agent and thickener. Its peculiar biodegradability, being not degradable in the small intestine but degradable by the anaerobic human intestinal bacteria, turn it into a promising candidate for colonic drug delivery systems. In this study aqueous systems (0.5%, w/v,) of KGM from three different origins and their mixtures with xanthan gum (XG) (1:1) were evaluated as regards their rheological properties and the diffusion coefficients and mobile fraction of macromolecules (dextrans of different molecular weight). Rheological data illustrate the synergism between KGM and XG at a stoichiometric relationship 1:1. Moreover, fluorescence recovery after photobleaching (FRAP) data indicate that diffusion of probes through the polysaccharide systems cannot be completely explained by the macroscopic properties of the medium but it is related to their molecular size and as a consequence to a sieving mechanism. The strong differences between KGM from different suppliers suggest the convenience of establishing specifications for this material in order to use it as pharmaceutical excipient.
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Affiliation(s)
- Felipe Alvarez-Manceñido
- Departamento Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
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88
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Effect of konjac glucomannan deacetylation on the properties of gels formed from mixtures of kappa carrageenan and konjac glucomannan. Carbohydr Polym 2005. [DOI: 10.1016/j.carbpol.2004.10.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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89
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90
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Cao X, Zhang L. Miscibility and properties of polyurethane/benzyl starch semi-interpenetrating polymer networks. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/polb.20356] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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91
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Nishinari K, Zhang H. Recent advances in the understanding of heat set gelling polysaccharides. Trends Food Sci Technol 2004. [DOI: 10.1016/j.tifs.2003.05.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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