中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
DSC study of phase transition of anhydrous phospholipid DHPC and influence of water content

文献类型:期刊论文

作者Wang, BN; Tan, F
刊名SCIENCE IN CHINA SERIES B-CHEMISTRY
出版日期1997-08-01
卷号40期号:4页码:412-418
关键词Phase Transition Differential Scanning Calorimetry 1 2-di-n-heptadecanoyl Phosphatidylcholine
ISSN号1001-652X
英文摘要The phase transition behavior of 1,2-di-n-heptadecanoyl phosphatidylcholine (DHPC) with and without water has been studied by use of differential scanning calorimetry. It was found by experiment that the glass transition occurred at first during the first heating of a sample of DHPC without water and then the sample underwent melting as an ordinary crystal. Therefore the sample of DHPC without water was a glassy crystal. However, the DHPC sample crystallizing from melt was an ordinary crystal. From the relationship between the total melting enthalpy Q(f) of freezable water and the water content h, it was concluded that the water contained in the DHPC samples might exist in three states recognizable thermodynamically. The water in the first state was an unfreezable water. It was the water bound directly with the head groups of the phospholipid, i.e. the primary hydration water. Every head group might bind seven such molecules of water. The water in the second state was the secondary hydration water, its melting point was close to that of pure water and its specific melting enthalpy dQ(f)/dh was lower than that of pure water. Every molecule of DHPC might possess at most about six such molecules of water. With the further increasing of the water content, the bulk water appeared in the system, its melting point and specific melting enthalpy were close to those of pure water. The experiments demonstrated that the melting peak of DHPC shifted toward the side of lower temperature with the increasing of water content. At h > 16.2 (percent by weight), the temperature T-tr and the enthalpy Delta H-tr of the gel-liquid crystal phase transition of the lipid were unchanged substantially with the increasing of water content. The experimental values of the quantities, T-tr and Delta H-tr, and phase transition entropy Delta S-tr were in good agreement with those calculated by the set of Huang equations (1981).
语种英语
WOS记录号WOS:A1997XR16500011
出版者SCIENCE CHINA PRESS
源URL[http://ir.iccas.ac.cn/handle/121111/44807]  
专题中国科学院化学研究所
通讯作者Wang, BN
推荐引用方式
GB/T 7714
Wang, BN,Tan, F. DSC study of phase transition of anhydrous phospholipid DHPC and influence of water content[J]. SCIENCE IN CHINA SERIES B-CHEMISTRY,1997,40(4):412-418.
APA Wang, BN,&Tan, F.(1997).DSC study of phase transition of anhydrous phospholipid DHPC and influence of water content.SCIENCE IN CHINA SERIES B-CHEMISTRY,40(4),412-418.
MLA Wang, BN,et al."DSC study of phase transition of anhydrous phospholipid DHPC and influence of water content".SCIENCE IN CHINA SERIES B-CHEMISTRY 40.4(1997):412-418.

入库方式: OAI收割

来源:化学研究所

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