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J Agric Food Chem. 2017 Mar 15;65(10):2120-2128. doi: 10.1021/acs.jafc.6b05799. Epub 2017 Feb 28.

Whole-Cell Biocatalytic Synthesis of Cinnamyl Acetate with a Novel Esterase from the DNA Library of Acinetobacter hemolyticus.

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College of Food Science and Engineering, Ocean University of China , Qingdao 266003, China.
Istituto di Chimica del Riconoscimento Molecolare, CNR , v. Mario Bianco 9, 20131 Milan, Italy.


Cinnamyl acetate has a wide application in the flavor and fragrance industry because of its sweet, balsamic, and floral odor. Up to now, lipases have been mainly used in enzyme-mediated synthesis of cinnamyl acetate, whereas esterases are used in only a few cases. Moreover, the use of purified enzymes is often a disadvantage, which leads to increases of the production costs. In this paper, a genomic DNA library of Acinetobacter hemolyticus was constructed, and a novel esterase (EstK1) was identified. After expression in Escherichia coli, the whole-cell catalyst of EstK1 displayed high transesterification activity to produce cinnamyl acetate in nonaqueous systems. Furthermore, under optimal conditions (vinyl acetate as acyl donor, isooctane as solvent, molar ratio 1:4, temperature 40 °C), the conversion ratio of cinnamyl alcohol could be up to 94.1% at 1 h, and it reached an even higher level (97.1%) at 2 h.


acetic esters; cinnamyl acetate; esterase; genomic DNA library; transesterification; whole-cell biocatalyst

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