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题名: Nonequilibrium thermodynamic separation model in capillary electrophoresis
作者: Liang, H;  Wang, ZG;  Lin, BC;  Xu, CG;  Fu, RN
关键词: separation optimization ;  nonequilibrium thermodynamics
刊名: JOURNAL OF CHROMATOGRAPHY A
发表日期: 1997-02-28
卷: 763, 期:1-2, 页:237-251
收录类别: SCI ;  ISTP
文章类型: Article
WOS标题词: Science & Technology ;  Life Sciences & Biomedicine ;  Physical Sciences
类目[WOS]: Biochemical Research Methods ;  Chemistry, Analytical
研究领域[WOS]: Biochemistry & Molecular Biology ;  Chemistry
英文摘要: This paper describes a separation model in capillary electrophoresis (CE) based on the entropy equation of nonequilibrium thermodynamics. We first related Delta S, the mixed entropy change of the solute system, to plate height (H) and Delta S-s, the contribution of Delta S only due to the net separation process, to resolution (R-s) and resolution product (Pi R-s). In particular, we determined the entropy flow of the solute system, which is composed of both energetic and material exchange terms relating to capillary cooling and relative migrations among solute zones, respectively. It is just the CE separation system, as exterior surroundings, that contributes to the enhanced separation efficiency. The more the CE system (except the solute system) provides the solute system with negative entropy flow, the better the separation efficiency of the CE system. We also determined six thermodynamic forces and their thermodynamic fluxes corresponding to six irreversible processes; heat conduction, four kinds of diffusion (electrical field, axial concentration gradient, electrophoretic dispersion and wall adsorption) and viscous flow, respectively. Entropy production is thus composed of the six terms corresponding to time-dependent CE efficiency loss factors. The bigger the entropy production, the greater the loss of separation efficiency. The objective functions were built based on the entropy equation of solute systems developed between CE separation efficiency (Delta S-S) and the optimizing parameters (electrical strength, coolant temperature; the composition and concentration of buffer; the radius, length and wall adsorption of the capillary; the concentration, charge, molecular weight and conformation of solutes; injection conditions, etc.). The more negative Delta S-s is, the better the separation efficiency. This model was supported by the results of our experiments and data in the literature.
关键词[WOS]: ZONE ELECTROPHORESIS
语种: 英语
WOS记录号: WOS:A1997WT45500026
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142802
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.BEIJING INST TECHNOL, COLL CHEM ENGN & MAT SCI, BEIJING 100081, PEOPLES R CHINA
2.CHINESE ACAD SCI, DALIAN INST CHEM PHYS, DALIAN 116012, PEOPLES R CHINA

Recommended Citation:
Liang, H,Wang, ZG,Lin, BC,et al. Nonequilibrium thermodynamic separation model in capillary electrophoresis[J]. JOURNAL OF CHROMATOGRAPHY A,1997,763(1-2):237-251.
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