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化学学报
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化学学报 ›› 2002, Vol. 60 ›› Issue (8): 1374-1378. 上一篇    下一篇

研究论文

丙氨酸在蔗糖-水混合溶剂中的焓对相互作用

李淑芹;林瑞森   

  1. 中国科学院植物研究所光合作用研究中心.北京(100093);浙江大学化学系,杭 州(310027)
  • 发布日期:2002-08-15

Pairwise Interaction of Enthalpies of Alanine in Sucrose-Water Mixed Solvents at 298.15 K

Li Shuqin;Lin Ruisen   

  1. Photosynthesis Research Center, Institute of Botany, Chinese Academy of Sciences.Beijing(100093);Department of Chemistry, Zhejiang University,Hangzhou(310027)
  • Published:2002-08-15

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被引次数

15 | 2

利用LKB2277生物活性检测仪测定了298.15 K时丙氨酸分别在不同组成的蔗糖- 水混合溶剂中的稀释焓，利用McMillan-Mayer理论，计算了丙氨酸在不同组成的蔗 糖-水混合溶剂中的焓对相互作用系数h_2，并与其在葡萄糖-水混合溶剂中的焓对 相互作用系数h_2进行了比较。结果表明，丙氨酸的h_2分别在葡萄糖和蔗糖的摩尔 分数为0.1009和0.05843处出现极大值，极值点位置的不同与糖分子所含羟基数目 的多少有关，根据溶质-溶质相互作用和溶质-溶剂相互作用对结果进行了解释。

关键词: 丙氨酸, 蔗糖, 生物活性, 相互作用, 葡萄糖, 水

The dilution enthalpies of L-alanine in sucrose-water mixed solvents at 298.15 K were measured by using LKB2277 flow microcalorimetry. Using the McMillan-Mayer theory, the enthalpic pair interaction coefficients (h_2) of alanine over the whole range of sucrose-water mixed solvents have been calculated and compared with the enthalpic pair interaction coefficients of alanine in glucose- water mixed solvents. It is found that h_2 alanine passes through a maximum at molar fractions 0.05843 and 0.1009 of sucrose and glucose respectively. The position of maximum of h_2 is is related to the number of the hydroxyl groups. The results are discussed n terms of solute-solute and solute-solvent interactions.

Key words: alanine, sucrose, BIOLOGICAL ACTIVITY, INTERACTIONS, GLUCOSE, WATER

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