Abstract
Borneol esters have attracted increasing interest due to their potential application in the food industry. In this study, the extraction of d-borneol from Cinnamomum camphora chvar. borneol seed was carried out via steam distillation to gain highly purified d-borneol (99.66%). The lipase-catalyzed lipophilization of extracted d-borneol with oleic acid was performed in a solvent-free system. The influences of lipase type, substrate molar ratio, lipase loading, reaction temperature and reaction time on d-bornyl oleate yield were evaluated. Among four kinds of commercial lipases screened for their esterification efficiency, CRL (lipase from Candida rugose) displayed the highest catalytic activity in the synthesis of d-bornyl oleate. The yield of more than 95% was obtained under the optimal conditions: substrate molar ratio 1:2 (d-borneol/oleic acid), lipase loading 8%, reaction temperature 45 °C, reaction time 48 h. The structural identification of d-borneol and product d-bornyl oleate was performed by gas chromatography mass spectrometry (GC-MS) and proton nuclear magnetic resonance spectroscopy (1H NMR). The results showed that the product was confirmed to be d-bornyl oleate and the purity of which was 97.51%. This study will pave the way for d-borneol and its esters application in food industry.
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