title: Effect of lipase immobilization on resolution of (R, S)-2-octanol in nonaqueous media using modified ultrastable-Y molecular sieve as support.
abstract: The lipase from Penicillium expansum PED-03 (PEL) was immobilized onto modified ultrastable-Y (USY) molecular sieve and the resolution of (R, S)- 2-octanol was carried out in a bioreactor in nonaqueous media by the immobilized lipase. It was found that the conversion rate, enantiomeric excess (ee) value, and enantioselectivity (E) value of the resolution catalyzed by PEL immobilized on modified USY molecular sieve were much higher than those of the reaction catalyzed by free PEL and PEL immobilized on other supports. Immobilized on modified USY molecular sieve, the PEL exhibited obvious activity within a wider pH range and at a much higher temperature and showed a markedly enhanced stability against thermal inactivation, by which the suitable pH of the buffer used for immobilization could be "memorized." The conversion rate of the reaction catalyzed by PEL immobilized on modified USY molecular sieve reached 48.84%, with excellent enantioselectivity (average E value of eight batches >460) in nonaqueous media at "memorial" pH 9.5, 50 degrees C for 24 h, demonstrating a good application potential in the production of optically pure (R, S)-2-octanol.
authors.affiliation: Department of Chemical Engineering and Bioengineering, Zhejiang University, Hangzhou 310027, The People's Republic of China.
authors.forename: Dazhang
authors.initials: D
authors.lastname: Dai
authors.forename: Liming
authors.initials: L
authors.lastname: Xia
mesh_terms: D019149:Bioreactors; D001709:Biotechnology; D004795:Enzyme Stability; D004800:Enzymes, Immobilized; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008049:Lipase; D000442:Octanols / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D010407:Penicillium / Q000201:enzymology; D012996:Solutions; D013237:Stereoisomerism; D013696:Temperature
chemical_list: D004800:Enzymes, Immobilized; D007477:Ions; D000442:Octanols; D012996:Solutions; C067943:2-octanol; D008049:Lipase