Effects of γ-irradiation on molar mass and properties of Konjac mannan

Prawitwong, Panida; Takigami, Shoji; Phillips, Glyn O.

doi:10.1016/j.foodhyd.2006.10.015

Cited by 41 publications

(17 citation statements)

References 18 publications

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“…The low aqueous solubility of KM has been attributed to strong structural hydrogen bonding [6] and high molar mass of 1.17 10 6 Da having α value of 0.78 in Mark-Houwink-Sakurada equation [3]. Water is probably first sorbed in the amorphous region where there is less hydrogen bonding and is first in the form of W nf and then as glassy water.…”

Section: Resultsmentioning

confidence: 99%

“…The absorbed dose was varied from 0.5 to 100 kGy and the dose rate was from 0.5 to 3.33 kGy/h. The molar masses of original KM and irradiated KM samples determined by the SEC-MALS method were 1.17 10 6 and from 2.07 10 5 to 4.86 10 4 , respectively [3]. The KM samples were dissolved in distilled water and centrifuged at 15,000 g for 30 min to remove cell wall debris before freeze-drying.…”

Section: Methodsmentioning

confidence: 99%

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Effects of Molar Mass on Water Binding Properties of γ-irradiated Konjac Glucomannan

Takigami

Prawitwong²,

Phillips

2009

Trans. Mat. Res. Soc. Japan

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effects of Molar Mass on Water Binding Properties of γ-irradiated Konjac Glucomannan

Takigami

Prawitwong²,

Phillips

2009

Trans. Mat. Res. Soc. Japan

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“…There was an interaction between the amino and hydroxyl groups of KGM and CS, and hydrogen bonding occurred between the hydroxyl groups. PVOH, KGM, and CS contain a large amount of hydroxyl groups, with the latter two containing amino groups (Chen et al 2015a, b;Prawitwong et al 2007). There was evidence of hydrogen bonding between KGM and PVOH, CS and PVOH, and KGM and CS.…”

Section: Infrared Spectrum Analysismentioning

confidence: 99%

Bond Performance and Structural Characterization of Polysaccharide Wood Adhesive Made from Konjac Glucomannan/Chitosan/Polyvinyl Alcohol

Gu¹,

Mu²,

Yang³

2016

BioResources

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aThe bond performance and bonding mechanism were evaluated for a Konjac glucomannan (KGM), Chitosan (CS), and polyvinyl alcohol (PVOH) blended wood adhesive. An optimized experimental strategy was used to investigate the effects of the formula parameters of adhesives on the bonding strength of plywood using a Box-Behnken design and response surface methodology (RSM). The microstructure of the blended adhesives was analyzed by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). An optimum bonding strength (3.42 ± 0.31 MPa) was achieved with concentrations of KGM, CS, and 10% PVOH of 2.3%, 2.3%, and 5.0%, respectively. There was strong hydrogen bonding between the KGM, CS, and 10% PVOH adhesives and the interface. SEM observations indicated that the blended adhesive exhibited a net-like structure that increased the overall bonding strength. These results provided the scientific basis for the continual development of environmentally friendly wood adhesives and the improvement of processing conditions.

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“…From our previous studies [7,8], the γ-irradiation led to chain scission of KM, but introduced no significant new chemical groups into the structure, apart from a small increase in content of carbonyl groups. The intrinsic viscosity, molar mass and radius of gyration decreased rapidly with increasing dose up to 10 kGy and then at a slower rate.…”

Section: Introductionmentioning

confidence: 99%

Characterization of γ-irradiated Konjac Glucomannan by Light Scattering and Scanning Probe Microscope

Makabe

Komiya

Prawitwong

et al. 2009

Trans. Mat. Res. Soc. Japan

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Konjac glucomannan (KM) is a water soluble glucomannan with high molar mass. KM aqueous solution shows extremely high viscosity. KM can be depolymerized by γ-rays irradiation. The molar mass of original KM was 1020 kDa. The molar mass of irradiated KM decreased significantly with increase of absorbed dose up to 2 kGy and then decreased gradually. The molar mass of 10 kGy irradiated KM was 236 kDa. The radius of gyration (R G ) of original KM was 98.0 nm. The R G value decreased significantly with increase of the dose up to 2 kGy and then reached to 46.4 nm at 10 kGy of absorbed dose. KM molecules were solvated in the form of random coils in water. The flexibility of molecular chain increased with increasing temperature. SPM image of original KM molecular chain showed rod-like pattern. The chain length and thickness of original KM was 1150 nm and 1.04 nm, respectively. The chain length decreased significantly with decrease of molar mass. However, the chain height scarcely changed regardless of molar mass. The chain lengths of low molar mass KM with 507 kDa and 236 kDa were 440 nm and 250 nm, respectively.

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Effects of γ-irradiation on molar mass and properties of Konjac mannan

Cited by 41 publications

References 18 publications

Effects of Molar Mass on Water Binding Properties of γ-irradiated Konjac Glucomannan

Effects of Molar Mass on Water Binding Properties of γ-irradiated Konjac Glucomannan

Bond Performance and Structural Characterization of Polysaccharide Wood Adhesive Made from Konjac Glucomannan/Chitosan/Polyvinyl Alcohol

Characterization of γ-irradiated Konjac Glucomannan by Light Scattering and Scanning Probe Microscope

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