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Effects of pH and temperature on colloidal properties and molecular characteristics of Konjac glucomannan.

Published on Dec 1, 2015in Carbohydrate Polymers6.04
· DOI :10.1016/j.carbpol.2015.07.050
Wenjie Jian2
Estimated H-index: 2
(PolyU: Hong Kong Polytechnic University),
Ka-Chai Siu8
Estimated H-index: 8
(PolyU: Hong Kong Polytechnic University),
Jian-Yong Wu44
Estimated H-index: 44
(PolyU: Hong Kong Polytechnic University)
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Abstract
Abstract The hydrocolloidal characteristics of Konjac glucomannan (KGM) are important for its application as a thickening and gelling agent for liquid foods. In this study, the rheological behavior and molecular properties such as molar mass, hydrodynamic radius and chain conformation of KGM in water were determined at various pH levels (4.0–10.0) during heating from 20 to 80 °C. Acidic and neutral conditions (pH 4.0–7.0) promoted the dispersion of KGM, and alkaline condition at pH 10 favored its aggregation in water, while KGM maintained a random coil conformation in the whole pH range. Associated with the pH effects were changes in the rheological behavior during heating from 20 to 80 °C. The significant differences in the colloidal and rheological characteristics were mainly attributed to alteration of intermolecular interaction (attractive or repulsive) rather than deacetylation at various pH levels. Deacetylation occurred in both acidic and alkaline condition. The second virial value was positive in acidic and negative in alkaline condition. The results showed that hydrocolloidal characteristics of KGM in water were significantly affected by pH.
  • References (38)
  • Citations (25)
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References38
Newest
Farage Al-Ghazzewi10
Estimated H-index: 10
,
A. Elamir1
Estimated H-index: 1
(University of Tripoli)
+ 1 AuthorsA. Elzagoze1
Estimated H-index: 1
(University of Tripoli)
The objective of this work was to determine the effects of ingested depolymerised glucomannans on wound healing. Mice were divided into four groups of twenty each: control – drinking water; control – drinking water containing 5% (w/v) glucomannan hydrolysate (GMH); test – drinking water with punched ear and; test – drinking water containing 5% (w/v) GMH with punched ear. Healing scores were recorded over eight days while body weight was taken four times over the trial period. There was faster he...
Published on Jan 1, 2015in Journal of Biological Physics0.86
Yingfang Ma2
Estimated H-index: 2
(Case Western Reserve University),
Diana Maria Acosta1
Estimated H-index: 1
(Case Western Reserve University)
+ 4 AuthorsV. Adrian Parsegian40
Estimated H-index: 40
(UMass: University of Massachusetts Amherst)
Composition-gradient multi-angle static light scattering (CG-MALS) is an emerging technique for the determination of intermolecular interactions via the second virial coefficient B22. With CG-MALS, detailed studies of the second virial coefficient can be carried out more accurately and effectively than with traditional methods. In addition, automated mixing, delivery and measurement enable high speed, continuous, fluctuation-free sample delivery and accurate results. Using CG-MALS we measure the...
Published on Jun 1, 2014in Carbohydrate Polymers6.04
Xia Chen7
Estimated H-index: 7
(PolyU: Hong Kong Polytechnic University),
Ka-Chai Siu8
Estimated H-index: 8
(PolyU: Hong Kong Polytechnic University)
+ 1 AuthorsJian-Yong Wu44
Estimated H-index: 44
(PolyU: Hong Kong Polytechnic University)
Abstract A high molecular weight (MW) exopolysaccaride (EPS) fraction EPS1 was isolated from the fermentation broth of a medicinal fungus Cordyceps sinensis Cs-HK1 and partially degraded by high-intensity ultrasound (US) into a lower MW fraction EPS1U. EPS1U exhibited a single, symmetric peak on size exclusion chromatography with an average MW of 730 kDa by light scattering analysis. It had a much lower intrinsic viscosity (1.7 versus 15.6 dL/g) but a much higher solubility in water (77.5 versus...
Published on May 1, 2014in Food Hydrocolloids5.84
Weiping Jin13
Estimated H-index: 13
,
Wei Xu14
Estimated H-index: 14
+ 4 AuthorsBin Li21
Estimated H-index: 21
(MOE: Chinese Ministry of Education)
Abstract 60 Co γ-ray irradiation assisted with ethanol pretreatment was utilized to prepare degraded konjac glucomannan products with well-dispersed low molecular fractions and white color. The molecular weight decreased from 1.4 × 10 6 to 6 × 10 5 at the dose of 3.6 kGy irradiation with 50% ethanol pretreatment. The properties and structure were analyzed by Fourier-transform infrared spectroscopy (FT-IR), colorimeter, dynamic light scattering (DLS), differential scanning calorimetry (DSC) and r...
Published on Apr 1, 2014in Carbohydrate Polymers6.04
Cui Zhang1
Estimated H-index: 1
(Chongqing University),
Jida Chen2
Estimated H-index: 2
(Chongqing University),
Feng-Qing Yang24
Estimated H-index: 24
(Chongqing University)
Abstract Oral colon targeting drug delivery system (OCDDS) is a highly effective formulation for drugs absorbed by colon, or to treat colonic diseases specifically. To obtain colon targeting, many pharmaceutical approaches have been studied, among which, taking advantage of specific degradation of excipients by colon enzymes is one of the most promising strategies. With properties of specific colon β-mannanase degradation, biocompatibility, gel-forming, low toxicity and high stability, konjac gl...
Published on Mar 1, 2014in Food Hydrocolloids5.84
Beatriz Solo-de-Zaldívar6
Estimated H-index: 6
(CSIC: Spanish National Research Council),
Clara A. Tovar20
Estimated H-index: 20
(University of Vigo)
+ 1 AuthorsBeatriz Herranz10
Estimated H-index: 10
(CSIC: Spanish National Research Council)
Abstract This paper focuses on the relationship between network structure and physicochemical and rheological properties of aqueous glucomannan dispersions (AGD) as a function of pH, to establish optimal conditions of glucomannan gelation for making restructured seafood products. Various lots of AGD were prepared from 3% (L1) and 5% (L2) konjac glucomannan adding different amounts (0.5–5%) of 0.6 N KOH to obtain samples with successively increasing degrees of alkalinity, from pH = 8.9 to = 11.9 ...
Published on Jan 1, 2014in Food Science and Technology Research0.45
Marta Tomczyńska-Mleko6
Estimated H-index: 6
,
Tom Brenner5
Estimated H-index: 5
(OCU: Osaka City University)
+ 4 AuthorsM. Wesołowska-Trojanowska4
Estimated H-index: 4
(University of Life Sciences in Lublin)
Jean-Pierre S. Sagou2
Estimated H-index: 2
(University of Lorraine),
Elise Rotureau12
Estimated H-index: 12
(University of Lorraine)
+ 1 AuthorsJérôme F. L. Duval30
Estimated H-index: 30
(University of Lorraine)
Abstract Electrostatic and hydrodynamic properties of carboxymethyldextran (CMD), a charged and well-defined polysaccharide, were evaluated in the presence and in the absence of divalent cations (calcium and cadmium) in aqueous NaNO 3 solution. For that purpose, size, electrophoretic mobility and protolytic features of CMD macromolecules were derived from dynamic light scattering, electrophoresis and proton titration measurements. Electrokinetic properties evaluated in the absence of metal ions ...
Published on May 1, 2013in Pharmaceutical Research3.90
Shuntaro Saito2
Estimated H-index: 2
(Osaka University),
Jun Hasegawa16
Estimated H-index: 16
(Daiichi Sankyo)
+ 3 AuthorsKiichi Fukui43
Estimated H-index: 43
(Osaka University)
Purpose To develop a general strategy for optimizing monoclonal antibody (MAb) formulations.
Published on May 1, 2013in Carbohydrate Polymers6.04
Surina Bo1
Estimated H-index: 1
(Kitami Institute of Technology),
Tegshi Muschin5
Estimated H-index: 5
(Kitami Institute of Technology)
+ 2 AuthorsTakashi Yoshida6
Estimated H-index: 6
(Kitami Institute of Technology)
Abstract The sulfation of konjac glucomannan and its anti-HIV and blood anticoagulant activities were investigated. Konjac glucomannan is a polysaccharide occurring naturally in konjac plant tubers and has high molecular weights. Solubility in water is very low, and the aqueous solutions at low concentrations have high viscosity. Before sulfation, hydrolysis by diluted sulfuric acid was carried out to decrease the molecular weights of M ¯ n = 19 .2 × 1 0 4 − 0 .2 × 1 0 4 . Sulfation with piperid...
Cited By25
Newest
Published on May 1, 2019in International Journal of Biological Macromolecules4.78
Wenjie Jian4
Estimated H-index: 4
,
Ying Ma (JMU: Jimei University)+ 5 AuthorsLanlan Wu2
Estimated H-index: 2
Abstract Silver nanoparticles (AgNPs) are eco-friendly antibacterial agents, yet their use is limited by their facile aggregation and precipitation. Therefore, the development of highly stable AgNPs is desirable. Herein, a polysaccharide–protein complex (PSP) was successfully obtained from viscera of abalone through a combination of enzymatic hydrolysis, membrane filtration, and gel permeation chromatography. Furthermore, highly stable AgNPs were successfully synthesized by using PSP as a reduci...
Published on Apr 11, 2019in Materials2.97
Yo Seph Lee1
Estimated H-index: 1
,
Yong Taek Lim2
Estimated H-index: 2
,
Won San Choi17
Estimated H-index: 17
Environmentally friendly superhydrophilic and superhydrophobic sponges were synthesized using a one-step approach for oil/water separation. A superhydrophilic or superhydrophobic sponge (MFS/CC-DKGM or MFS/CC-PDMS) was synthesized by one-step coating of melamine formaldehyde sponge (MFS) with a mixture of calcium carbonate (CC) rods and deacetylized Konjac glucomannan (DKGM) [or polydimethylsiloxane (PDMS)]. The MFS/CC-PDMS showed excellent absorption capacity, which reached 52–76 g/g following ...
Published on Jan 1, 2019in RSC Advances3.05
Li Yuan3
Estimated H-index: 3
(Jiangsu University),
Jiamei Yu (Jiangsu University)+ 4 AuthorsRuichang Gao5
Estimated H-index: 5
(Jiangsu University)
This work studied the effects of KGM with different degrees of deacetylation (DDs) on the physicochemical properties of silver carp (Hypophthalmichthys molitrix) surimi gels. Compared with KGM, deacetylated KGM (DKGM) weakened the water-holding capacity, but increased the gel strength of surimi gels. The storage modulus (G′) and loss modulus (G′′) of surimi showed an upward trend, and the aggregation rate of surimi with DKGM changed. The number of ionic bonds of mixed surimi gels increased on th...
Published on Dec 1, 2018in Food Chemistry5.40
Yun Zhou3
Estimated H-index: 3
(CAU: China Agricultural University),
Runsheng Jiang1
Estimated H-index: 1
(CAS: Chinese Academy of Sciences)
+ 1 AuthorsYongqiang Cheng10
Estimated H-index: 10
(CAU: China Agricultural University)
Abstract A molecular-level mechanism of alkali induced konjac glucomannan (KGM) hydrogel gelation processing is considered with the application of nuclear magnetic resonance (NMR) spectroscopy and atomic force microscopy (AFM) as complementary methods to diffusive wave spectroscopy (DWS) microrheology and thermoanalysis. It is shown that deacetylation of KGM chains occurs immediately upon mixing with Na 2 CO 3 , inducing self-packaging. Partial unfolding of the packed loose structure of dehydrat...
Published on Oct 1, 2018in International Journal of Biological Macromolecules4.78
Xuanbo Liu1
Estimated H-index: 1
(CAU: China Agricultural University),
Jing Gan4
Estimated H-index: 4
(CAU: China Agricultural University)
+ 3 AuthorsYongqiang Cheng10
Estimated H-index: 10
(CAU: China Agricultural University)
Abstract When konjac glucomannan (KGM) molecules are deacetylated under alkaline conditions, the aqueous KGM solution is transformed into a thermally stable gel. In this study, series of Na 2 CO 3 -induced and K 2 CO 3 -induced KGM hydrogels were prepared by deacetylation using different concentrations (0.1, 0.2, 0.3, and 0.4 M) of alkali. The hydrogels were characterized using texture profile analysis, scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy, X-ray diffractio...
Published on Sep 1, 2018in European Journal of Nutrition4.45
Alexandra L. Jenkins41
Estimated H-index: 41
(St. Michael's Hospital),
Linda M. Morgan45
Estimated H-index: 45
(University of Surrey)
+ 3 AuthorsVladimir Vuksan50
Estimated H-index: 50
(U of T: University of Toronto)
Purpose Use of polypharmacy in the treatment of diabetes is the norm; nonetheless, optimal control is often not achieved. Konjac-glucomannan-based fibre blend (KGB) and American ginseng (AG) have individually been shown to improve glycaemia and CVD risk factors in type 2 diabetes. The aim of this study was to determine whether co-administration of KGB and AG could improve diabetes control beyond conventional treatment.
Published on Sep 1, 2018in Applied Energy8.43
Wanwu Li2
Estimated H-index: 2
(Huada: Beijing University of Chemical Technology),
Habiba Khalid3
Estimated H-index: 3
(Huada: Beijing University of Chemical Technology)
+ 4 AuthorsEva Thorin18
Estimated H-index: 18
(MDH: Mälardalen University College)
Abstract Lignocellulosic biomass is the most abundant natural resource with high biomethane potential. However, complex structure of lignocellulosic biomass has hampered the efficient utilization of this bioresource. Previous studies have investigated the overall anaerobic digestion performance of lignocellulosic biomass, but the individual participation of each lignocellulosic component during anaerobic digestion remained unclear. Thus, this study investigated the methane production characteris...
Published on Aug 1, 2018in Regenerative Biomaterials
Jiayuan Tang1
Estimated H-index: 1
(Sichuan University),
Jinlin Chen1
Estimated H-index: 1
(Sichuan University)
+ 2 AuthorsHongsong Fan21
Estimated H-index: 21
(Sichuan University)
Published on Jun 1, 2018in Food Hydrocolloids5.84
Kao Wu7
Estimated H-index: 7
(HBUT: Hubei University of Technology),
Qian Zhu1
Estimated H-index: 1
(HBUT: Hubei University of Technology)
+ 4 AuthorsFatang Jiang13
Estimated H-index: 13
(HBUT: Hubei University of Technology)
Abstract An improved preparation method of konjac glucomannan-ethyl cellulose (KGM-EC) composite film was adopted to allow hydrophobic contents (EC) varying from 0% to 85.7% in the films, and may be explained by emulsification effect of both KGM and EC. Scanning electron microscopy images supported that all blend films had homogenous microstructures without phase separation. Moisture adsorption, water contact angle, swelling test, water vapor transmission, and mechanical tests were performed to ...
Published on May 1, 2018in Food Research International3.58
Wenjie Jian4
Estimated H-index: 4
(SCAU: South China Agricultural University),
Yung-Husan Chen + 3 AuthorsYuanming Sun20
Estimated H-index: 20
(SCAU: South China Agricultural University)
Abstract Konjac glucomannan (KGM) is an important source for preparation of Konjac oligo-glucomannan (KOG), but high molecular weight and viscosity in KGM inhibited its full degradation into KOG. In this study, KOG with a degree of polymerization between 2 and 9 was obtained by combining γ-irradiation and enzymatic hydrolysis in high yield. We investigated the protective effect of KOG against H 2 O 2 - induced oxidative damage in vitro, using human hepatic cell line (LO2) as a cell model. Our re...
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