Pretreatment of an Induced Mycelium-Bound Lipase from Aspergillus niger MYA 135 Improves Its Hydrolytic and Synthetic Activity

Exploring novel Penicillium lipolytic activity from the Paranaense rainforest

In this study, we evaluated the presence of lipases in twenty fungal strains of the genus Penicillium using an efficient and low-cost method with a view to an application in the treatment of cooking oil residues. The Paranaense rainforest is one of the most biodiverse places on the planet, making it the most likely site to find new fungal strains with lipolytic potential. The objective of this study was to determine the lipolytic potential and the isoenzyme profile of fungi belonging to the Penicillium genus isolated from the Paranaense rainforest. Seven fungal strains were selected using qualitative screening. Quantitative analysis revealed that the isolate Penicillium sp. LBM 088 was the best producer of lipase, reaching 1224 U mL^-1 of lipolytic activity. Zymogram gels of the seven selected strains showed different enzymatic profiles: In general, the molecular mass of proteins varied from 26 to 42 kDa. Also, proteins from fungi grown on olive oil showed a higher variation in their molecular mass than proteins from fungi grown without the oil. The search for new lipase-secreting organisms should lead to the exploitation of biodiversity in the region.

Nutritional targeting modification of silkworm pupae oil catalyzed by a smart hydrogel immobilized lipase

To prepare a nutritional supplement using silkworm pupae oil (SPO) as a feedstock, a microfluidic reactor with a smart hydrogel immobilized lipase was first constructed to reduce the relative content of palmitic acid at sn-1,3 and improve the nutritional function. The effects of flow rate, reaction temperature, and substrate molar ratio were investigated. In vitro digestion and pH-stat models were employed to analyze the digestion feature after the modification of SPO, while HPLC-ELSD, zeta potential, DSC, and TGA were used to evaluate the nutritional function. The relative content of "OOO" and "OPO" type triglycerides was increased by 49.48% and 107.67%, and that of palmitic acid at sn-1,3 was decreased by 49.61% in 10 s. After the verification of the in vitro digestion model, the fatty acid release rate of the modified SPO was significantly improved by 22.07%, indicating the nutritional function improvement of SPO. Therefore, the nutritional function of SPO has been improved successfully by the application of a microchannel reactor with photo-immobilized lipase, which could set a reference for the utilization of insect oil resources.