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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