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Applied Biochemistry and Biotechnology

, Volume 82, Issue 3, pp 185–198 | Cite as

Lipase-catalyzed production of short-chain acids terpenyl esters of interest to the food industry

  • Françoise Laboret
  • Robert PerraudEmail author
Article

Abstract

The production of low molecular weight esters as flavor compounds by biotechnological processes has a potential interest for the food industry. The use of natural available substrates and enzymes is an essential part of the process design, because the products may obtain natural label. In this study, direct esterification of citronellol and geraniol with short-chain fatty acids catalyzed by free lipase from Mucor miehei was performed with high yields in n-hexane. The effects of the acid:alcohol ratio on the bioconversion rate of increasing chain length esters was investigated. To reach the optimum yield, substrates and enzyme concentration were determined. The inhibiting effects of acid are strongly attenuated by reducing the quantity of acid and increasing the amount of enzyme in media following the optimum values. Improvements have been made to increase the ester purity. The consumption of excess substrate by adding calculated amounts of acid gives a 10% yield enhancement, and leads to 100% pure terpenyl esters. The first steps to a scale-up application were attempted using a reactor that allowed us to produce ester quantities up to 100 cm3. Separation and purification of the products were treated with success, underlining the lipase stability and efficiency under the conditions of this study. The ability to recover the enzyme, and reusing it in bioconversions, plays a major role in reducing the cost of the overall process.

Index Entries

Lipase Mucor miehei direct esterification enzymatic synthesis organic solvents terpenyl esters 

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Copyright information

© Humana Press Inc. 1999

Authors and Affiliations

  1. 1.Groupe de Recherche sur l’Environnement et la Chimie AppliquéeUniversité Joseph FourierGrenobleFrance

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