Researches on the Properties of Stearate-Carboxymethyl Konjac Glucomannan Ester Prepared by Microwave Method

2011 ◽  
Vol 295-297 ◽  
pp. 117-125
Author(s):  
Xiao Man Zeng ◽  
Bei Yu Liu ◽  
Jian Wang ◽  
Geng Zhong ◽  
Yu Hong Xia
Keyword(s):  
Ambient Temperature ◽  
Microwave Heating ◽  
Chemical Properties ◽  
Konjac Glucomannan ◽  
Microwave Method ◽  
Physico Chemical ◽  
Substitution Degree ◽  
Oil Water ◽  
Carboxymethyl Konjac Glucomannan ◽  
Thermal Stable

In this study, microwave heating was used for the preparation of stearate-carboxymethyl konjac glucomannan ester (SCMK), which introduced hydrophilic carboxymethyl and hydrophobic stearate groups on konjac glucomannan (KMG) backbone. The physico-chemical properties and structure of SCMK were investigated. Results show that the viscosity of SCMK is much lower than that of KGM, but larger slightly than the carboxymethyl konjac glucomannan (CMK) and the viscosity is still stable after being placed for 48 h at ambient temperature. Its transmittance decreases and the resistance ability of SCMK solution to salt/sugar as well as base have been significantly promoted. Moreover, SCMK with substitution degree (DS) of 0.02 is proved to be a sound oil/water emulsifier which its HLB value is 13.01. In FTIR spectrum, the absorption peak of SCMK decreases at 2161.84 cm-1 and 2360.74 cm-1. Meanwhile, TGA indicates that SCMK is less thermal stable than KGM and CMK, but is still good.

scholarly journals Effects of deacetylation of konjac glucomannan on the physico-chemical properties of surimi gels from silver carp (Hypophthalmichthys molitrix)

RSC Advances ◽  
2019 ◽  
Vol 9 (34) ◽  
pp. 19828-19836 ◽  
Author(s):  
Li Yuan ◽  
Jiamei Yu ◽  
Jianlou Mu ◽  
Tong Shi ◽  
Quancai Sun ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Silver Carp ◽  
Chemical Properties ◽  
Konjac Glucomannan ◽  
Hypophthalmichthys Molitrix ◽  
Physico Chemical

This work studied the effects of KGM with different degrees of deacetylation (DDs) on the physicochemical properties of silver carp (Hypophthalmichthys molitrix) surimi gels.

scholarly journals Controllable synthesis of pomelo peel-based aerogel and its application in adsorption of oil/organic pollutants

2019 ◽  
Vol 6 (2) ◽  
pp. 181823 ◽  
Author(s):  
Guangyu Shi ◽  
Yizhu Qian ◽  
Fengzhi Tan ◽  
Weijie Cai ◽  
Yuan Li ◽  
...  
Keyword(s):  
High Speed ◽  
Chemical Properties ◽  
Absorption Capacity ◽  
High Porosity ◽  
X Ray Diffraction ◽  
Water Separation ◽  
Physico Chemical ◽  
Wide Range ◽  
Oil Water Separation ◽  
Oil Water

Oil/water separation is a field of high significance as it might efficiently resolve the contamination of industrial oily wastewater and other oil/water pollution. In this paper, an environmentally-friendly hydrophobic aerogel with high porosity and low density was successfully synthesized with renewable pomelo peels (PPs) as precursors. Typically, a series of sponge aerogels (HPSA-0, HPSA-1 and HPSA-2) were facilely prepared via high-speed dispersion, freeze-drying and silanization with methyltrimethoxysilane. Indeed, the physical properties of aerogel such as density and pore diameter could be tailored by different additives (filter paper fibre and polyvinyl alcohol). Hence, their physico-chemical properties including internal morphology and chemical structure were characterized in detail by Fourier transform infrared, Brunauer–Emmett–Teller, X-ray diffraction, scanning electron microscope, Thermal gravimetric analyzer (TG) etc. Moreover, the adsorption capacity was further determined and the results revealed that the PP-based aerogels presented excellent adsorption performance for a wide range of oil products and/or organic solvents (crude oil 49.8 g g −1 , soya bean oil 62.3 g g −1 , chloroform 71.3 g g −1 etc.). The corresponding cyclic tests showed the absorption capacity decreased slightly from 94.66% to 93.82% after 10 consecutive cycles, indicating a high recyclability.

Characterization of Physico-Chemical Properties of Oil/Water Systems: Interfacial Behavior Prediction

2004 ◽  
Vol 22 (9-10) ◽  
pp. 1199-1211 ◽  
Author(s):  
Luciana S. Spinelli ◽  
Dilon L. P. Machado ◽  
Elizabete F. Lucas ◽  
Ana M. T. Louvisse
Keyword(s):  
Chemical Properties ◽  
Water Systems ◽  
Behavior Prediction ◽  
Interfacial Behavior ◽  
Physico Chemical ◽  
Oil Water

scholarly journals Electrical Properties of Multilayer Systems Composed of Foundry Tooling and Moulding Sand

2017 ◽  
Vol 17 (2) ◽  
pp. 21-24
Author(s):  
B. Gal ◽  
K. Granat
Keyword(s):  
Electrical Properties ◽  
Microwave Heating ◽  
Structural Changes ◽  
Chemical Properties ◽  
Heating Power ◽  
Real Component ◽  
Multilayer Systems ◽  
Empirical Modelling ◽  
Physico Chemical ◽  
Moulding Sand

Abstract Within the research, selected multilayer technological systems created as combinations of water-glass containing moulding sand with foundry tooling, were characterised on the grounds of their electrical properties. By measuring resonance frequency and quality factor of a waveguide resonance cavity, real component of permittivity εr’ and loss tangent tgδ were determined for multilayer foundry systems with various qualitative and quantitative compositions. It was demonstrated that combination of a sandmix and foundry tooling with known dielectric properties results in a system with different physico-chemical properties, whose relation to the parameters of individual components of the system is undefined at this research stage. On the grounds of measurement results, theoretical value of microwave heating power, dissipated in unit volume of the selected multilayer foundry system, was determined. Knowledge of theoretical heating power and evaluation of physical, chemical and structural changes occurring in moulding sands exposed to microwaves in such a technological system makes a ground for empirical modelling of the process of microwave heating of foundry moulds and cores.

Physico-Chemical Properties of Konjac Glucomannan

2020 ◽  
pp. 189-207
Author(s):  
Patricia Le Bail ◽  
Céline Lafarge ◽  
Nathalie Cayot
Keyword(s):  
Chemical Properties ◽  
Konjac Glucomannan ◽  
Physico Chemical

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

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