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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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丝氨酸在醇-水溶液中的溶解焓
, PP. 2238-2240
Keywords: 溶解焓,L-丝氨酸,醇,结构相互作用
Abstract:
用RD-496Ⅲ双热流精密微热量计测量了L-丝氨酸在纯水以及异丙醇、1,2-丙二醇和丙三醇水溶液中的溶解焓,并计算了从水到醇-水溶液中的迁移焓.实验发现,L-丝氨酸在水及醇-水溶液中的溶解焓都是正值,它从水到醇-水溶液中的迁移焓也都是正值,并且基本上随着醇浓度的增加而增加,说明在溶解过程中,溶质与混合溶剂分子的部分去水化吸热过程占主要地位.另外,实验还发现L-丝氨酸从水到异丙醇水溶液中的迁移焓大于在1,2-丙二醇水溶液中的,更大于在丙三醇水溶液中的,这是由于羟基的减少导致了疏水-亲水作用的增加和亲水-亲水作用的减弱.
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