Study of Surfactant-enhanced-hydrodistillation of Lemon Oil and its Applications

Abstract

Recently due to the good biological properties the wide applications of lemon oil (LO) increase its demand Thus the efficiency of extracting lemon oil becomes a concerning topic In this study surfactant-enhanced-hydrodistillation with a mixture of Tween 40 and Tween 85 was employed to speed up the rate of LO extraction as well as to separate LO easily Also response surface methodology (RSM) was applied to systematically optimize the parameters of extracting process which were surfactant concentration extracting time and liquid/solid ratio in this study The solubility and stability of LO emulsion were investigated for the application of LO-added polymer films as active packaging Moreover the antibacterial property of LO was evaluated Results showed that the optimal condition was 1545 5 ppm as the concentration of surfactant Tween 40/Tween 85 mixed in 3/1 156 3 min for extraction time and liquid/solid ratio at 15 Under these conditions according to the fitted second-order polynomial model the response Y was predicted to be 30 14 A kinetics model simulated the extraction process and displayed a higher mass transfer coefficient in the presence of surfactant assisting Composition analysis by GC-FID and HPLC indicated no difference between LOs from the two hydrodistillation processes The solubility of LO appeared linear increasing with surfactant concentration and is was higher than commercial lemon oil (CLO) due to the different compositions A microemulsion formed when 0 3% LO in 5% surfactant solution and can maintain its stability for more than 28 days The antibacterial test illustrated the good activity of LO against E coli and S aureus even better than CLO in addition the chitosan/surfactant film with LO showed antibacterial activity against S aureus

Date of Award	2020
Original language	English
Supervisor	Bing-Hung Chen (Supervisor)