Publications (4)2.6 Total impact
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ABSTRACT: Candida sp.99-125 lipase was suitable for transesterification of fats and oils to produce fatty acid methyl ester. The adsorption of Candida sp.99-125 lipase onto the fiber-like SBA-15 mesoporous material has been studied. The unaltered structural order of the fiber-like SBA-15 before and after the adsorption has been confirmed by FT-IR, SEM and N2 adsorption. The amount of adsorbed Candida sp.99-125 lipase depends both on the solution pH and reaction time. Good adsorption capacity of Candida sp.99-125 lipase on fiber-like SBA-15 may be due to solution pH from 5.0 to 9.0 especially at 7.0 (93.99 mg enzyme per gram silica is obtained and the activity recovery is 281.05%). A high lipase loading (135.9 mg enzyme per gram silica) was obtained, but it did not produce a proportionate level of catalytic activity. The immobilized Candida sp.99-125 lipase showed increased adaptability in the hydrolysis of p-nitrophenyl acetate compared to free Candida sp.99-125 lipase at pH 5.0-9.0. Meanwhile, the immobilized Candida sp.99-125 lipase showed higher thermal stability than that of free Candida sp.99-125 lipase. And the synthesis of retinyl palmitate in organic solvent with the immobilized Candida sp.99-125 lipase was investigated. The influence factors, such as: the solvent used, the molar ratio and concentrations of substrates, the reaction time and the amount of lipase were studied and optimized. In the conditions of transesterificating 0.164 g retinyl acetate and 0.32 g palmitic acid, 10 mL of solvent hexane, 1:4 of mass ratio of lipase to retinyl acetate, and 6 hours of reaction time, 74.6% of retinyl acetate was converted into retinyl plamitate.
Article: 2-Nitrobenzyl 2-chloroacetate[Show abstract] [Hide abstract]
ABSTRACT: In the molecule of the title compound, C9H8ClNO4, an intramolecular C—H...O interaction results in the formation of a near-planar (r.m.s. deviation 0.002 Å) five-membered ring, which is oriented at a dihedral angle of 4.07 (4)° with respect to the adjacent aromatic ring. In the crystal structure, intermolecular C—H...O interactions link the molecules into a two-dimensional network.
Article: 4-Nitrobenzyl 2-bromoacetate[Show abstract] [Hide abstract]
ABSTRACT: In the molecule of the title compound, C9H8BrNO4, the acetate group is close to planar [maximum deviation = 0.042 (3) Å] and is oriented at a dihedral angle of 73.24 (3)° with respect to the aromatic ring. In the crystal structure, intermolecular C—H...O interactions link the molecules into a three-dimensional network, forming R22(10) ring motifs.
Article: 4-Nitrobenzyl 2-chloroacetate[Show abstract] [Hide abstract]
ABSTRACT: In the molecule of the title compound, C9H8ClNO4, the nearly planar acetate moiety [maximum deviation = 0.015 (3) Å for an O atom] is oriented with respect to the plane of the aromatic ring at a dihedral angle of 73.03 (3)°. In the crystal structure, intermolecular C—H...O interactions link molecules into a network. π–π contacts between benzene rings [centroid–centroid distance = 4.000 (1) Å] may further stabilize the structure.
Nanjing University of Technology
Nan-ching, Jiangsu Sheng, China
- College of Biotechnology and Pharmaceutical Engineering