物理化学学报 >> 2002, Vol. 18 >> Issue (09): 825-829.doi: 10.3866/PKU.WHXB20020912

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丝氨酸在蔗糖水溶液中的稀释焓

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
  • 收稿日期:2002-01-11 修回日期:2002-03-08 发布日期:2002-09-15
  • 通讯作者: 李淑芹 E-mail:lishuqin1965@yahoo.com.cn

The Dilution Enthalpies of Serine in Aqueous Sucrose Solutions at 298.15 K

Li Shu-Qin;Lin Rui-Sen   

  1. Photosynthesis Research Center, Institute of Botany, Chinese Academy of Sciences, Beijing　100093;Department of Chemistry, Zhejiang University, Hangzhou　310027
  • Received:2002-01-11 Revised:2002-03-08 Published:2002-09-15
  • Contact: Li Shu-Qin E-mail:lishuqin1965@yahoo.com.cn

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摘要： 利用LKB 2277生物活性检测仪分别测定了298.15 K时丝氨酸在不同组成的蔗糖水溶液中的稀释焓, 利用McMillan-Mayer理论,计算了丝氨酸在不同组成的蔗糖水溶液中的焓对相互作用系数,并与其在葡萄糖水溶液中的焓对相互作用系数h2进行了比较.结果表明,丝氨酸在蔗糖和葡萄糖水溶液中的焓对相互作用系数h2都是负值,并且随着糖浓度的增加,h2系数的绝对值逐渐减少.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: 丝氨酸, 蔗糖水溶液, 葡萄糖水溶液, 稀释焓, 结构相互作用

Abstract: The dilution enthalpies of serine in aqueous sucrose solutions at 298.15 K were measured by LKB 2277 flow microcalorimetry. Using the McMillan-Mayer theory, the enthalpic pair interaction coefficients (h2) of serine over whole range of aqueous sucrose solutions have been calculated and compared with the enthalpic pair interaction coefficients of serine in aqueous glucose solutions. It is found that h2 of serine in aqueous sucrose and h2 in glucose solutions are negative and become less negative with increasing the concentration of sucrose and glucose. The results are discussed in terms of solute-solute and solute-solvent interactions.

Key words: Serine, Aqueous sucrose solutions, Aqueous glucose solutions, Dilution enthalpy, Structural interactions