Optical resolution of racemic 2-hydroxy octanoic acid by lipase-catalyzed hydrolysis in a biphasic membrane reactor

High yield expression of Lipase A from Candida antarctica in the methylotrophic yeast Pichia pastoris and its purification and characterisation

The current investigation focuses on shedding further light on the characteristics of lipase A from Candida antarctica (CalA), which has attracted growing attention in its suitability for industrial applications. CalA was functionally expressed in the methylotrophic yeast Pichia pastoris, purified and characterised. A classical fed-batch process and a semi-continuous process were developed and tested with regard to their yield capacity. Lipase concentrations of 0.88 and 0.55 g l(-1) were obtained using the fed-batch and semi-continuous processes, respectively. The semi-continuous process reaches a total activity of 10,233,000 U and so surpasses the fed-batch process reaching 7,530,000 U. The purified enzyme showed highest activity between 50 and 70 degrees C at pH 7.0 and a preference for short-chain triglycerides (C4-C8). Significantly reduced activity was observed in the presence of hydrophilic esters.