Abstract
AbstractBACKGROUNDThe natural gamma‐decalactone (GDL) produced by microbial fermentation is an essential lactone compound as a generally recognized as safe food additive. Effective control of the substrate ricinoleic acid (RA) concentration in the biotransformation medium is a bottleneck for the industrial manufacture of GDL. In this study, porous starch (P‐S) was utilized as a carrier of RA to control its distribution in the medium. The effect of P‐S on the biotransformation was evaluated and the mechanism was revealed.RESULTSScanning electron microscopy, Fourier‐transform infrared spectroscopy, and thermogravimetric analysis indicated that the RA layer was formed on the surface of P‐S, which increased the opportunity for interaction between microorganisms and the substrate. With P‐S‐embedded RA as a substrate, the yield of GDL increased to 3.36 g L‐1 which was 17.5% higher than in the control. In addition, the presence of P‐S in this system had no negative effect on the viability of the microorganism.CONCLUSIONThis study is a new attempt to apply P‐S as a delivery system in the biotransformation of GDL to increase its yield which indicates that the P‐S‐controlled release is a potential method of improving natural GDL production in industrial scale. © 2017 Society of Chemical Industry
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