Covalent Coupling Method for Lipase Immobilization on Controlled Pore Silica in the Presence of Nonenzymatic Proteins

• Published in: Biotechnology progress Vol. 19; no. 3; pp. 803 - 807
• Main Authors: Soares, Cleide M. F, Santana, M. Helena A., Zanin, Gisella M., de Castro, Heizir F.
• Format: Journal Article
• Language: English
• Published: USA American Chemical Society 01-05-2003; American Institute of Chemical Engineers
• Subjects: Biological and medical sciences; Biotechnology; Butanols - chemistry; Butyrates - chemical synthesis; Butyric Acid - chemistry; Candida - chemistry; Candida - enzymology; Coenzymes - chemistry; Enzyme Activation; Enzymes, Immobilized - chemistry; Fundamental and applied biological sciences. Psychology; Membranes, Artificial; Phosphatidylcholines - chemistry; Porosity; Protein Binding; Proteins - chemistry; Quality Control; Serum Albumin - chemistry; Serum Albumin, Human; Silicon Dioxide - chemistry; Enzyme; Immobilization; Triacylglycerol lipase; Hydrolases; Esterases; Method; Silica; Protein; Carboxylic ester hydrolases
• ISSN: 8756-7938; 1520-6033
• DOI: 10.1021/bp025779q

Candida rugosa lipase was covalently immobilized on silanized controlled pore silica previously activated with glutaraldehyde in the presence of nonenzymatic proteins. This strategy is suggested to protect the enzyme from aggregation effects or denaturation that occurs as a result of the presence of silane precursors used in the formation of the silica matrix. The immobilization yield was evaluated as a function of the lipase loading and the additive type (albumin and lecithin) using statistical concepts. In agreement with the mathematical model, the maximum coupling yield (32.2%) can be achieved working at high lipase loading (450 units·g‐1 support) using albumin as an additive. In these conditions, the resulting immobilized lipase exhibits high hydrolytic (153.2 U·mg‐1) and esterification (337.6 mmol·g‐1·min) activities. The enhanced activity of the final lipase derivative is the sum of the benefits of the immobilization (that prevents enzyme aggregation) and the lipase coating by additives that increases the accessibility of active sites to the substrate.