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China Surfactant Detergent & Cosmetics ›› 2025, Vol. 55 ›› Issue (9): 1120-1128.doi: 10.3969/j.issn.2097-2806.2025.09.005

• Basic research • Previous Articles     Next Articles

Study on the construction, stability and antifungal activity of microemulsion system of Noni essential oil

Xuefeng Wang1,2,Qian Jiang1,Zuowang Fan3,Xiaoli Xie1,Fulai Yu1,*(),Dan Wang1,*()   

  1. 1. Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences/Key Laboratory of Biology and Cultivation of Herb Medicine, Ministry of Agriculture and Rural Affairs, P.R. China/Hainan Provincial Engineering Research Center for Tropical Medicinal Plants, Haikou, Hainan 571101, China
    2. College of Tropical Crops, Yunnan Agricultural University, Pu’er, Yunnan 665000, China
    3. Sanming Medical and Polytechnic Vocational College, Sanming, Fujian 365000, China
  • Received:2024-09-29 Revised:2025-08-22 Online:2025-09-22 Published:2025-10-11
  • Contact: *E-mail: wang_dan1414@163.com (Dan Wang); fulai.yu@163.com (Fulai Yu). E-mail:fulai.yu@163.com;wang_dan1414@163.com

Abstract:

In order to obtain stable oil-in-water (O/W) microemulsion of Noni essential oil (NEO), the water titration method and the pseudo ternary phase diagram method were used to investigate the effects of polyoxyethylene nonionic surfactants, co-surfactants, Km value (the mass ratio of surfactant to co-surfactant), components, and proportions on the microemulsion formation. Meanwhile, the particle size, morphology, electrical conductivity, water solubility, stability, and antifungal activity of the NEO microemulsion were measured to determine their characteristics and physicochemical properties. The results show that castor oil polyethylene glycol 40 as the surfactant, propylene glycol as the co-surfactant, and Km with 3 when the mass ratio of NEO to the mixed surfactant is 7∶3, the water content of the O/W type aqueous phase is 70%, and the NEO microemulsion can be formed. The microemulsion is stable, transparent, and clear with a blue tint. The average particle size is (25.88±4.82) nm with the PDI of 0.177±0.030, and the microemulsion particles are more uniformly dispersed, spherical, and nearly spherical. At the same time, NEO microemulsion has good storage stability, centrifugal stability, and ion concentration stability, and is suitable for use at temperatures below 40 ℃ and in slightly acidic environments. The antifungal effect of NEO microemulsion on Candida tropicalis is better than that of NEO. This study shows that the microemulsion can achieve nanoparticle encapsulation of NEO, providing a good foundation for the widespread application of NEO.

Key words: Noni essential oil, microemulsion, pseudo ternary phase diagram, stability, Candida tropicalis, antifungal activity

CLC Number: 

  • TQ658