Studies on crystallization and cross-linking of lipase for biocatalysis.
The development of robust biocatalysts with increased stability and activity is a major challenge to industry. A major breakthrough in this field was the development of cross-linked enzyme crystals with high specificity and stability. A method is described to produce micro crystals of CLEC lipase, which is thermostable and solvent stable. Lipase from Burkholderia cepacia was crystallized using ammonium sulfate and cross-linked with glutaraldehyde to produce catalytically active enzyme. The maximum yield of CLEC was obtained with 70% ammonium sulfate and cross-linked with 5% (v/v) glutaraldehyde. SEM studies showed small hexagonal-shaped crystals of 2-5 microm size. CLEC lipase had improved thermal and reuse stability. It is versatile, having good activity in both polar and nonpolar organic solvents. CLEC lipase was coated using beta cyclodextrin for improving the storage and reuse stability. CLEC was successfully used for esterification of Ibuprofen and synthesis of ethyl butyrate.
Rajan
Akhila
A
Chemical Science and Technology Division, NIST (Regional Research Laboratory) CSIR, Trivandrum, 695 019, India.
Emilia Abraham
T
T
D002384:Catalysis; D003432:Cross-Linking Reagents / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004789:Enzyme Activation; D004795:Enzyme Stability; D008049:Lipase / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D011487:Protein Conformation
D003432:Cross-Linking Reagents; D008049:Lipase