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  • Enzymatic synthesis of rose aromatic ester (2-phenylethyl acetate) by lipase.

Enzymatic synthesis of rose aromatic ester (2-phenylethyl acetate) by lipase.

Journal of the science of food and agriculture (2012-03-08)
Chia-Hung Kuo, Shu-Hua Chiang, Hen-Yi Ju, Yu-Min Chen, Ming-Yuan Liao, Yung-Chuan Liu, Chwen-Jen Shieh
ABSTRACT

2-Phenylethyl acetate (2-PEAc) is a highly valued natural volatile ester with a rose-like odour that is widely used to add scent or flavour to cosmetics, soaps, foods and drinks. In this study, 2-PEAc was synthesised enzymatically by transesterification of vinyl acetate with 2-phenethyl alcohol catalysed by immobilised lipase (Novozym(®) 435) from Candida antarctic Response surface methodology and a three-level/three-factor Box-Behnken design were used to evaluate the effects of time, temperature and enzyme amount on the molar conversion % of 2-PEAc. The results showed that temperature was the most important variable. Based on the ridge max analysis results, optimum enzymatic synthesis conditions were predicted as a reaction time of 79 min, a temperature of 57.8 °C and an enzyme amount of 122.5 mg. The predicted and experimental yields were 86.4 and 85.4% respectively. Three immobilised lipases were screened and 15 reaction conditions were tested in order to find the combination for maximum yield. The optimisation of 2-PEAc synthesis catalysed by Novozym(®) 435 was successfully developed. The kinetic study of this transesterification reaction showed that it followed an ordered ping-pong bi-bi mechanism without any inhibition by reactants.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Phenethyl acetate, natural, ≥98%, FCC, FG
Sigma-Aldrich
Phenethyl acetate, ≥98%, FCC, FG
Sigma-Aldrich
2-Phenethyl acetate, 99%