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多酚-蛋白质络合反应的影响因素研究 被引量:20
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作者 黄惠华 王志 陈建新 《食品科学》 EI CAS CSCD 北大核心 2003年第2期22-25,共4页
本实验根据游离蛋白质含量的变化,以其在595nm的波长下的吸光度为指标,研究多酚物质与蛋白质的络合起混反应。在研究影响多酚-蛋白质反应的各种因素中,发现温度,体系的pH值,有机溶剂乙醇,反应中多酚-蛋白质的比例等都对多酚-蛋白质络合... 本实验根据游离蛋白质含量的变化,以其在595nm的波长下的吸光度为指标,研究多酚物质与蛋白质的络合起混反应。在研究影响多酚-蛋白质反应的各种因素中,发现温度,体系的pH值,有机溶剂乙醇,反应中多酚-蛋白质的比例等都对多酚-蛋白质络合物的生成量有一定的影响。在40℃,pH值为3.5,乙醇浓度为6%,明胶与单宁酸的质量比例为5∶1时,产生的多酚-蛋白质络合物的量最大。 展开更多
关键词 多酚-蛋白质络合反应 温度 PH值 饮料 稳定技术 混浊量
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Seasonal distribution and relationship of water mass and suspended load in North Yellow Sea 被引量:4
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作者 李真 鲍献文 +2 位作者 王勇智 李娜 乔璐璐 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2009年第4期907-918,共12页
The concentration of suspended load can be determined by its linear relationship to turbidity. Our results present the basic distribution of suspended load in North Yellow Sea. In summer, the suspended load concentrat... The concentration of suspended load can be determined by its linear relationship to turbidity. Our results present the basic distribution of suspended load in North Yellow Sea. In summer, the suspended load concentration is high along the coast and low in the center of the sea. There are four regions of high concentration in the surface layer: Penglai and Chengshantou along the north of the Shandong Peninsula, and the coastal areas of Ltishun and Changshan Islands. There is a 2 mg/L contour at 124°E that separates the North Yellow Sea from regions of lower concentrations in the open sea to the west. And there is a 2 mg/L contour at 124°E that separates the North Yellow Sea from regions of lower concentrations in the open sea to the west. The distribution features in the 10 m and bottom layer are similar to the surface layer, however, the suspended load concentration declines in the 10 m layer while it increases in the bottom layer. And in the bottom layer there is a low suspended load concentration water mass at the region south of 38°N and east of 123°E extending to the southeast. In general, the lowest suspended load concentration in a vertical profile is at a depth of 10 to 20 m, the highest suspended load concentration is in the bottom near Chengshantou area. In winter, the distribution of suspended load is similar to summer, but the average concentrations are three times higher. There are two tongue-shaped high suspended load concentration belt, one occurring from surface to seafloor, extends to the north near Chengshantou and the other invades north to south along the east margin of Dalian Bay. They separate the low suspended load concentration water masses in the center of North Yellow Sea into east and west parts, Vertical distribution is quite uniform in the whole North Yellow Sea because of the cooling effect and strong northeast winds. The distribution of suspended load has a very close relationship to the current circulation and wind-induced waves in the North Yellow Sea. Because of this, we have been able to show for the first time that the distribution of suspended load can be used to identify water masses. 展开更多
关键词 North Yellow Sea suspended load TURBIDITY CURRENT Yellow Sea cold mass
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