Results 91 to 100 of about 745 (126)

Determination of the degree of the substitution of hydroxyethyl guar gum

Carbohydrate Polymers, 2008
Abstract An improved chemical method for the determination of the degree of the substitution of hydroxyethyl guar gum by mixed p -toluenesulfonic-acetic anhydride has been described. The hydroxyethyl groups are cleaved from modified galactomannans at 130 °C in the presence of excess mixed p -toluenesulfonic-acetic anhydride for 14 h, and then the ...
Ling-Sa He, Bo Jiang, Ke Wang
openaire   +1 more source

Guar gum: a cheap substitute for agar in microbial culture media

Letters in Applied Microbiology, 2005
To determine the possibility of using guar gum, a colloidal polysaccharide, as a cheap alternative to agar for gelling microbial culture media.As illustrative examples, 12 fungi and 11 bacteria were cultured on media solidified with either guar gum or agar. All fungi and bacteria exhibited normal growth and differentiation on the media gelled with guar
R, Jain, V, Anjaiah, S B, Babbar
openaire   +2 more sources

Intrinsic viscosity and rheological properties of natural and substituted guar gums in seawater

International Journal of Biological Macromolecules, 2015
The intrinsic viscosity and rheological properties of guar gum (GG), hydroxypropyl guar (HPG) and carboxymethyl guar (CMG) in seawater and the effects of shear rate, concentration, temperature and pH on these properties were investigated. An intrinsic viscosity-increasing effect was observed with GG and HPG in seawater (SW) compared to deionized water (
Shibin Wang, Le He, Jianchun Guo, Jinzhou Zhao, Hongbiao Tang   +4 more
openaire   +2 more sources

Selective oxidation and determination of the substitution pattern of hydroxypropyl guar gum

Carbohydrate Polymers, 2010
Abstract The substituent distribution in hydroxypropyl guar gums was characterized by chemical methods in this study. A new method based on periodate oxidation combined with probability analysis was proposed to determine the degree of substitution at secondary hydroxyl groups.
Xiaoyan Wu, Yingqing Ye, Yannan Chen, Bin Ding, Junjie Cui, Bo Jiang   +5 more
openaire   +1 more source

Effects of guar gum as a fat substitute in low fat meat emulsions

Journal of Food Processing and Preservation, 2017
The physicochemical, oxidative, and sensory properties were determined for low fat meat emulsions containing varying levels of guar gum (0.5, 1.0, and 1.5%) as a fat substitute. Reduction of fat and incorporation of guar gum resulted in higher emulsion stability and cooking yield but lower penetration force.
Sajad A. Rather, F. A. Masoodi, Rehana Akhter, Jahangir A. Rather, Furheen Amin   +4 more
openaire   +1 more source

Rheological properties of hydroxypropyl- and sodium carboxymethyl-substituted guar gums in aqueous solution

Journal of Applied Polymer Science, 1982
The aqueous solutions of guar gum and its hydroxypropyl (HP) and sodium carboxymethyl (sod CM) derivatives are pseudoplastic, and the transition from Newtonian to pseudoplastic occurs in the low-shear-rate range at the concentrations of interest to industries.
S. Venkataiah, E. G. Mahadevan
openaire   +1 more source

Determination of the Degree of Substitution of Cationic Guar Gum by Headspace-Based Gas Chromatography during Its Synthesis

Journal of Agricultural and Food Chemistry, 2017
This study reports on a headspace-based gas chromatography (HS-GC) technique for determining the degree of substitution (DS) of cationic guar gum during the synthesis process. The method is based on the determination of 2,3-epoxypropyltrimethylammonium chloride in the process medium.
Xiaofang Wan, Congbao Guo, Jiarui Feng, Teng Yu, Xin-Sheng Chai, Guangxue Chen, Wei-Qi Xie   +6 more
openaire   +2 more sources

Isolation and characterization of galactomannan from Dimorphandra gardneriana Tul. seeds as a potential guar gum substitute

Food Hydrocolloids, 2009
Abstract A galactomannan was obtained from mature seeds of Dimorphandra gardneriana Tul., the plant from which rutin is extracted. The galactomannan extraction was based on manual separation of the endosperm, water dissolution, centrifugation and precipitation with ethanol.
Pablyana L.R. Cunha, Ícaro G.P. Vieira, Ângela M.C. Arriaga, R.C.M. de Paula, Judith P.A. Feitosa   +4 more
openaire   +1 more source

Synergistic viscosity characteristics of aqueous mixed solutions of hydroxypropyl- and carboxymethyl hydroxypropyl-substituted guar gums

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2006
Abstract The viscosity characteristics of aqueous mixed solutions of two important guar gum derivatives, hydroxypropyl-substituted guar (HPG) and carboxymethyl hydroxypropyl-substituted guar (CMHPG), were studied at different mixing ratios, shear rates and temperatures.
Li-Ming Zhang, Jian-Fang Zhou
openaire   +1 more source

Determination of the degree of substitution of hydroxypropyl guar gum at C-6 by Pyrolysis-Gas Chromatography spectrometry

Carbohydrate Polymers, 2010
Abstract Determination of the degree of substitution of hydroxypropyl guar gum is important as it provides information about the inhomogeneous substitution that may seriously affect the properties in various applications. In this study, the pyrolysis products of guar gum and hydroxypropyl guar gums were examined by gas chromatography and GC–MS ...
Yannan Chen, Xiaoyan Wu, Xia Miao, Jia Luo, Bo Jiang   +4 more
openaire   +1 more source