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Chemistry and Industry of Forest Products ›› 2021, Vol. 41 ›› Issue (1): 67-76.doi: 10.3969/j.issn.0253-2417.2021.01.010

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Preparation Conditions and Properties of O/W Type Litsea cubeba Oil Microemulsion

Chen CHENG, Hongyan SI(), Zongde WANG, Shengliang LIAO, Chenyang ZOU, Peng WANG   

  1. College of Forestry, Jiangxi Agricultural University; East China Woody Fragrance and Flavor Engineering Research Center, National Forestry and Grassland Administration, Nanchang 330045, China
  • Received:2020-02-20 Online:2021-02-28 Published:2021-03-03
  • Contact: Hongyan SI E-mail:hongyansi16@163.com


A microemulsion of Litsea cubeba(Lour.) Pers. oil was prepared by adding water. The influence of different surfactant and cosurfactant-types, the mass ratio of surfactant to cosurfactant(Km), and preparation temperature on the formation of water-in-oil(O/W) type microemulsion of L. cubeba oil were investigated using a single factor method, and through orthogonal experiments, the optimum preparation process of O/W type L. cubeba oil microemulsion was determined as follows: Triton X-100 as surfactant, absolute alcohol as cosurfactant, Kmvalue was equal to 1, and preparation temperature was set to 25 ℃. Under the best preparation conditions, the ratio of the mixed surfactant and the essential oil of L. cubeba was 9∶1, and the water content was 70% for sample 1. The average particle diameter, polydispersion coefficient, conductivity and pH value of sample 1 were 13.43 nm, 0.125, 83 mS/m, and 5.82, respectively. The performance test and analysis of sample 1 showed that there was no change in the appearance of the microemulsion when it was centrifuged at the rate of 1 000 to 4 000 r/min, which could prove that the centrifugal stability was better than essential oil. Adding the same amount of methylene blue aqueous solution to sample 1 and essential oil, its diffusion rate in sample 1 was significantly faster than that in the essential oil, which proved that the water solubility of microemulsion was significantly better than that of the essential oil.After 12 h of sustained-release, the content of sustained-release citral in the microemulsion was significantly less than that of the sustained-release citral in the essential oil, indicating that the sustained release of the microemulsion was better than that of the essential oil itself. The results of 1, 1-diphenyl-2-picrylhydrazyl free radical(DPPH·) and 2, 2'-azinobis-(3-ethylbenzthiazoline-6-sulphonate) radical(·ABTS+) scavenging experiments indicated that DPPH· and·ABTS+ scavenging rates of sample 1 of L. cubeba essential oil microemulsion were significantly higher than those of essential oil in the concentration range of 10-30 g/L. The DPPH·and·ABTS+ scavenging rates of the L. cubeba essential oil microemulsion sample 1 at 30 g/L concentration were 95% and 54.7%, while those of L. cubeba essential oil were only 44.79% and 16.4%, respectively, indicating that L. cubeba essential oil prepared as microemulsion could significantly improve its antioxidant property, and the anti-oxidation property of microemulsion to DPPH· was significantly better than that of·ABTS+.

Key words: Litsea cubeba essential oil, microemulsion, preparation conditions, antioxidant activity

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