Blend films from chitosan and konjac glucomannan solutions

Abstract

Blend films were prepared by blending 7 wt % konjac glucomannan (KGM) aqueous solution with 2 wt % chitosan (CH) in acetate solution and dried at 40°C for 4 h to obtain the transparent films. Their structure and properties were studied by infrared (IR), wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential thermal analysis (DTA). Crystallinities of the blend films decreased with the increase of konjac glucomannan. The thermostability, tensile strength, and breaking elongation of the blend films in dry state were obviously higher than those of both konjac glucomannan and chitosan films. Tensile strength of the dry blend film achieved 73.0MPa when the weight ratio of chitosan to konjac glucomannan was 7:3. The structure analysis indicated that there is a strong interaction between konjac glucomannan and chitosan resulted from intermolecular hydrogen bonds. The water solubility of the blend films was improved by blending with konjac glucomannan, so they have promising applications to soluble antiseptic coating of pills.

Preparation and characterization of konjac glucomannan and sodium carboxymethylcellulose blend films

“…Konjac glucomannan was extracted and purified from the tuber of Amorphophallus konjac (supplied by the Zhuxi Konjac Institute, Hubei) according to our previous work. 12 The viscosity average molecular weight of KGM was calculated to be 2.5 ϫ 10 5 by using viscometry according to the Mark-Houwink equation 15 : [] ϭ 3.8 ϫ 10 Ϫ2 M 0.723 . Other chemical agents used were analytically pure.…”

Effect of gamma irradiation on the condensed state structure and mechanical properties of konjac glucomannan/chitosan blend films

“…It is the N-deacetylated derivative of chitin, a cationic polysaccharide composed of d-glucosamine and N-acetyld-glucosamine residues with 1,4-linkages (Majeti & Ravi, 2002;Xiao, Gao, Wang, & Zhang, 2000). Chitosan and its derivatives have been identified as hydrophilic, non-toxic, biodegradable, antibacterial and suitable as scaffold for tissue engineering Madihally & Matthew, 1999;Shanmugasundaram et al, 2001;Zhang & Zhang, 2001).…”

Single molecular chain geometry of konjac glucomannan as a high quality dietary fiber in East Asia

“…The introduction of KGM fiber in a diet might improve metabolic control in human beings (Vuksan et al, 1999(Vuksan et al, , 2000 and low levels of KGM exhibited lower plasma cholesterol in rats (Levrat-Verny, Behr, Mustad, Remesy, & Demigne, 2000). Additionally, KGM could be extruded into films (Dave, Sheth, McCarthy, Ratto, & Kaplan, 1998) or form blend membranes (Cheng, Karim, Norziah, & Seow, 2002;Xiao, Gao, Wang, & Zhang, 2000;Yang et al, 1998) for coating and packaging applications in food Industry, and KGM gels had the promising applications to a controlled release matrix (Perols, Piffaut, Scher, Ramet, & Poncelet, 1997). Maeda, Shimahara, and Sugiyama (1980) different species as 1.12 · 10 6 or 2.619 · 10 5 by using light scattering, moreover, viscosity-average molecular weight (M g ) of KGM measured by Xu and Yang (1990) was 8.09 · 10 5 .…”