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ISSN : 1225-0112(Print)
ISSN : 2288-4505(Online)
Applied Chemistry for Engineering Vol.14 No.5 pp.629-633
DOI :

Research Papers : Backward Extraction Efficiency of BSA from AOT Reverse Micellar Solution Using the Phase-Transfer Method

Sin Jae Sun

Abstract

Micellar aggregates are known to be useful for the selective isolation of biologically active materials such as amino acids, proteins, and enzymes sparsely dispersed in aqueous mixtures. In this work, the effects of pH, the type of added salt and its concentration in the excess aqueous phase on the back extraction efficiency of bovine serum albumin (BSA) using a reverse micellar system, of which the organic phase contains sodium di-(2-ethylexyl) sulfosuccinate (AOT) and iso-octane, were extensively examined. In this effort, BSA solubilized in the reverse micelles by means of the phase-transfer method was back-extracted by bringing an excess aqueous phase into contact. When 1 : 1 salt such as KCL or NaCl was added, BSA effectively back-extracted to the excess aqueous phase at higher pH values than its isoelectric point pI. In case of NaCl, the molar ratio of water to surfactant in the organic phase W_(0) slightly decreased and thereafter increased with pH of the excess aqueous phase. In contrast, he resulting values of W_(0) upon the back-extraction were independent of the excess aqueous phase pH for KCl, MgCl₂, and CaCl₂.

연구논문 : 상접촉법을 이용한 AOT 역미셀 용액으로부터 BSA 역추출 효율

신재순,강춘형

초록

역미셀은 수용성 혼합물로부터 단백질, 아미노산, 효소 등과 같은 생물학적 물질들을 선택적으로 분리하는데 사용될 수 있다. 본 연구에서는 sodium di-(2-ethyl hexyl) sulfosuccinate (AOT)와 iso-octane으로 형성된 역미셀을 이용하여 수용액상에 녹아있는 수용성 단백질인 bovine serum albumin (BSA)를 유기상으로 추출한 후 새로운 과잉 수용액상으로 회수하는 실험을 수행하였다. KCI이나 NaCl과 같은 1:1 염을 수용액에 첨가하면 BSA의 등전점 이상의 pH에서 높은 역추출 효율을 보였다. 유기상의 수분함량은 NaCl의 경우 pH 변화에 따라 약간 감소하다가 다시 증가하는 경향을 보인데 반해 나머지 KCI와 MgCl₂, 그리고 CaCl₂의 경우에는 pH 변화와 관계없이 거의 일정한 값을 보임을 알 수 있었다.

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