Algae oil contains polyunsaturated fatty acids (PUFAs) that are beneficial to human health and development. Enzymatic refining is a sustainable approach that can improve the quality and nutritional value of algae oil. However, this approach involves the use of specific enzymes to remove unwanted impurities such as phospholipids (PLs) and free fatty acids (FFAs). This study proposes a novel immobilized phospholipase, immobilized phospholipase A1 (PLA1@MCM-41-C 8 ), which serves a dual purpose: it is effective for both degumming arachidonic acid (ARA)-enriched algal oil and its subsequent deacidification. The use of PLA1@MCM-41-C 8 achieved a degumming rate of 95.9% for crude algal oil, with an ARA retention rate of up to 97.3%. The acidity of the degummed oil decreased from 14.5 to 1.1 mg KOH∙g −1 , while simultaneously producing 29.2% high-value diacylglycerol (DAG). By comparing enzymatically degummed and deacidified ARA-enriched algae oil (EDDO) with crude ARA-enriched algae oil (CO), commercialized refining algae oil (CRO), it was found that enzymatic refining had minimal impact on antioxidant stability, fatty acid composition, and oil content. In particular, the flavor characteristics of algal oil before and after enzymatic refining with PLA1@MCM-41-C 8 remained unchanged and were dominated by the main volatile compounds: alcohols and aldehydes. Compared with free phospholipase A1 (PLA1), PLA1@MCM-41-C 8 exhibited significantly improved thermostability, pH tolerance, solvent tolerance, and long-term reusability. These characteristics make it a promising candidate for complex oil refining in industrial applications.
Rapeseed oil is a widely consumed edible oil that contains varieties of beneficial micronutrients such as tocopherols and phytosterols; however, the high acid value due to increased free fatty acid can imperil the oil quality and safety. This paper proposed the enzymatic deacidification for high-acid rapeseed oil and simultaneous production of functional diacylglycerols (DAGs) catalyzed by self-made immobilized lipase CALB@MCM-41-C8. The results indicate that the carrier of molecular sieve MCM-41 exhibited a sufficient surface area of 1439.9 m2/g and a proper pore size of 3.5 nm, promoting the immobilization of lipase CLAB. Under the optimal reaction conditions, the acid value of rapeseed oil was largely decreased from 15.3 mg KOH/g to 1.7 mg KOH/g within 3 h, while DAG content was increased from 1.2% to 40.2%. The antioxidant stability of rapeseed oil was also increased from 4.3 h to 7.6 h after enzymatic deacidification. Besides, the deacidified rapeseed oil exhibited fatty, bitter almond aromas, compared to the picked-vegetable, spicy, and pungent aromas for high-acid oil. Finally, the catalytic stability and applicability of CALB@MCM-41-C8was validated, thus demonstrating the great potential of CALB@MCM-41-C8in green refining of edible oils and sustainable synthesis of functional lipids.
危险品化学品经营许可证（带存储）