Gel Filtration Fractionation of the Whole Water-Extractable Soybean Proteins

SUMMARY— The water-extractable soybean proteins (WESP) were fractionated into five fractions by gel filtration with Sephadex G-200 column. Four of the five fractions were protein fractions, while the fifth fraction was nonprotein fraction. The first two fractions were heterogeneous by sedimentation analysis, while the third and fourth fractions give homogeneous fractions with 7s and 2s respectively. The trypsin inhibitor activity was found only in the fourth fraction.     

Curdlan: Properties and Application to Foods

Gel formation of curdlan at 100–130°C and behaviors of curdlan gels under frozen state were investigated by measuring gel strength and syneresis. Even when aqueous suspensions of curdlan were heated to 100°C or higher, they formed a gel, and gel strength increased with temperature. Curdlan gel was also stable against freezing and thawing. The syneresis of a 4% curdlan gel after freezing and thawing was reduced from 20.6% to about 2.1% by addition of 5% waxy corn starch and to 8.9% by addition of 20% sucrose. Suggested by these findings, new applications to foods have been developed, especially those subject to retorting and/or freezing.     

防屈曲支撑的研究进展及其工程应用

简要介绍了防屈曲支撑的组成及工作机理,详细介绍了防屈曲支撑的发展和近年来中国学者在理论研究和类型创新方面取得的研究成果;着重讨论了三重钢管、端部铰式、中部接触环式等新型防屈曲支撑的性能;最后给出了防屈曲支撑在中国的应用情况.研究结果表明:防屈曲支撑以其良好的耗能性能会有很好的发展潜力;防屈曲支撑应该向着低屈服点设计、适用于大跨结构、便于安装等方向发展,并在实际工程中推广应用.     

TENSIPRESSER PRECISION IN MEASURING COOKED RICE ADHESIVENESS

Precision in measuring cooked rice adhesiveness was studied using a Tensipresser and the "full cup" method. To determine the optimum adhesiveness parameter, 14 samples each from rice harvests in 1992 and 1993 were used. Out of the 42 parameters derived from a force-distance curve, the ratio of cumulative adhesiveness to cumulative hardness,     was used as the optimum because of its high correlation (r >0.9) with sensory adhesiveness, high precision (mean coefficient of variation (CV) of 14 samples <15% and maximum CV of 14 samples <25 %), and high resolution based on Kruskal-Wallis test statistic H. For parameter     , the maximum CV decreased with the increasing number of bites, and statistic H indicated that increasing the number of bites from 1 to 5 increased resolution, but bites exceeding 5 did not clearly do so.