Abstract Purpose This work studies the immobilization of two enzymes, alcohol dehydrogenase (ADH) and aldehyde (AldDH) both from Saccharomyces cerevisiae , which could be used to produce high value-added molecules carboxylic acids embedded in anaerobic digestate. Methods In particular, three mesoporous siliceous materials, with different specific surface areas pore sizes, (MSU-H, MSU-F MCF 0.75...