Development of a Tailored Sol-Gel Immobilized Biocatalyst for Sustainable Synthesis of the Food Aroma Ester n-Amyl Caproate in Continuous Solventless System

• Published in: Foods
• Main Authors: Vasilescu, Corina, Paul, Cristina, Marc, Simona, Hulka, Iosif, Péter, Francisc
• Other Authors: orcid:0000-0002-3436-8327, orcid:0000-0001-5570-8418, orcid:0000-0003-1099-331X, orcid:0000-0001-5442-0631, orcid:0000-0001-7248-2641, BU-ING
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2022
• Subjects: 3206 Ciencias de la nutrición; Candida antarctica B lipase (CalB); Sol-gel entrapment; Response surface methodology (RSM); Green biocatalysis; Food aroma ester production; Continuous flow synthesis; Antarc*; Antarctica
• Online Access: http://hdl.handle.net/10553/118803; https://doi.org/10.3390/foods11162485

This study reports the synthesis of a hybrid sol-gel material, based on organically modified silanes (ORMOSILs) with epoxy functional groups, and its application in the stabilization of lipase type B from Candida antarctica (CalB) through sol-gel entrapment. The key immobilization parameters in the sol-gel entrapment of lipase using epoxysilanes were optimized by the design of numerous experiments, demonstrating that glycidoxypropyl-trimethoxysilane can allow the formation of a matrix with excellent properties in view of the biocatalytic esterifications catalyzed by this lipase, at an enzyme loading of 25 g/mol of silane. The characterization of the immobilized biocatalyst and the correlation of its catalytic efficiency with the morphological and physicochemical properties of the sol-gel matrix was accomplished through scanning electron microscopy (SEM), fluorescence microscopy (FM), as well as thermogravimetric and differential thermal analysis (TGA/DTA). The operational and thermal stability of lipase were increased as a result of immobilization, with the entrapped lipase retaining 99% activity after 10 successive reaction cycles in the batch solventless synthesis of n-amyl caproate. A possible correlation of optimal productivity and yield was attempted for this immobilized lipase via the continuous flow synthesis of n-amyl caproate in a solventless system. The robustness and excellent biocatalytic efficiency of the optimized biocatalyst provide a promising solution for the synthesis of food-grade flavor esters, even at larger scales. 0,774 4,35 Q1 Q2 SCIE 10,5