ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Preparation and properties of surfactant-bacillolysin ion-pair in organic solvents
Ying Zhang, Jiadong Gu, Shugen Wang, and Xuerong Fan
Key Laboratory of Eco-Textiles, School of Textiles and Clothing, Jiangnan University, Wuxi, 214122, China
Received: 29 June 2009 Revised: 5 November 2009 Accepted: 1 December 2009
Abstract: The transesterification-active enzyme bacillolysin was extracted into organic solvents such as isooctane by enzyme-AOT (bis
(2-ethylhexyl) sulfosuccinate) ion-pairing preserving its natural second structure and catalytic activity. Extraction efficiency
was affected by the interaction mode of the two phases, ionic strength, and pH of aqueous phase, surfactant and enzyme concentration.
Magnetic stirring with phase mixing was favorable for the enzyme extraction. Optimal ionic strength and pH were 8 mM CaCl2 and 5.0, respectively. Critical number of AOT molecule for an enzyme molecule to be extracted into isooctane was 89. Optimal
initial enzyme concentration in the aqueous phase was 7 mg mL−1 while the initial AOT concentration in isooctane was 3 mM. Within CMC (critical micellar concentration) of AOT in isooctane,
the increase of initial AOT concentration enhanced the extraction efficiency.
Keywords: bacillolysin - AOT - ion-pair - solvent - transesterification
Full paper is available at www.springerlink.com.
Chemical Papers 64 (4) 443–449 (2010)