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RISS 인기검색어
- 검색키워드
- 저자 : 西成勝好 (검색결과 2 건)
- 무료
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Solution Properties of Glucomannan(Ⅰ)
金南姬,西成勝好,金敬伊 성신여자대학교기초과학연구소 1987 基礎科學硏究誌 Vol.4 No.-
Glucomannan isolated from the tuber of Amophophallus Konjac C. Koch. It was washed by methanol and was fractionated into four fractions using methanol as a precipitant. Intrinsic viscosity was determined by Ubbelohde viscometer at 25.4±0.02℃. The fraction of higher molecular weight showed a deviation from linearity in the plot of reduced viscosity against concentration at lower concentrations with comparison to the fraction of lower molecular weight. The viscosity of glucomannan solution was observed by a low shear viscometer. The plot of the logarithm of the zero shear specific viscosity against the logarithm of the concentration of the glucomannan solution showed a inflection point. It was attributed to the commencement of the coil overlap of glucomannan molecules as has been observed for many polysaccharide solutions.
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Subfractionated Dextran의 流動學的 性質에 關한 硏究 : 점성도 측정을 中心으로
金南姬,西成勝好,李香愛 성신여자대학교기초과학연구소 1987 基礎科學硏究誌 Vol.4 No.-
Some rheological properties of subfractions for Dextran in the molecular weight range of 3×10⁴∼?? was investigated at room temperature. The dependence of the viscosity for concentration, shear rate, pH & ionic strength, temperature and solvent effect was observed. From the experimental data the Mark-Houwink viscosity equation in water at 25℃ was determined for samples having the molecular weight ranging from 3×10⁴∼?? as [η]=??(in dl/g). The intrinsic stiffness of the Dextran backbone was estimated by evaluating the "characteristic ratio"??, which is below the 0.082. The transition from dilute to concentrated solutions behavior occurs at a critical concentration c*=0.4/[η], ηsp varies as ?? for dilute solutions and as ?? for concentrate solutions. In the concentrated region, the viscosity of the Dextran was decreased with increasing shear rate and was exponentially decreased with raising temperature, the viscosity showed the maximum value at neutral state. From the experimental data, it was concluded that Dextran chain linked by the α-1, 6-glucosidic linkage, behaves like a flexible random coil chain in aqueous solution, Dextran solutions are pseudoplastic power law fluids among the empirical models of non-Newtonian behavior. Urea is an active reagent which increases the viscosity and swells of dextran while Pyridine & Glycerol are inactive reagents. Also, it could be estimated that the formation of gel structure is promote to the neutral state, and the molecular weight larger than ??, when electrolytic concentration is 1N and urea is use to solvent.
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