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China Surfactant Detergent & Cosmetics ›› 2019, Vol. 49 ›› Issue (12): 805-810.doi: 10.3969/j.issn.1001-1803.2019.12.007

• Development and application • Previous Articles     Next Articles

Effects of sodium chloride on the multiple emulsion encapsulating Vitamin C

CHEN Kai-li1,LIU Dong2,ZHANG Yun2,NI Xin-jiong1,CAO Yu-hua1(),CAO Guang-qun1   

  1. 1. The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering,Jiangnan University, Wuxi, Jiangsu 214122, China
    2. Suzhou Greenleaf Daily Commodity Co., Ltd., Suzhou, Jiangsu 215000, China
  • Received:2019-03-19 Revised:2019-11-20 Online:2019-12-22 Published:2019-12-24
  • Contact: Yu-hua CAO E-mail:yuhuacao64@gmail.com

Abstract:

Water-in-oil-in-water(W1/O/W2)multiple emulsion was prepared by two-step method with caprylic/capric triglyceride as oil phase, lauryl PEG-9 polydimethylsiloxyethyl dimethicone as oleophilic emulsifier and the amphiphilic random copolymer as hydrophilic emulsifier. The multiple emulsion was used to encapsulate Vitamin C in internal aqueous phase(W1). Sodium chloride(NaCl)regulated the osmotic pressure between the internal and external aqueous phases to improve the stability of the multiple emulsion. The effects of the amount of NaCl on the interfacial tension, droplet size of emulsion and viscosity were investigated. The stability of the multiple emulsion was evaluated by optical microscope and emulsion appearance. The results show that, the addition of NaCl in W1 lead to significant decrease of W1/O interfacial tension, smaller size of the emulsion droplets, and higher viscosity of the emulsion. The interfacial tension at O/W2 interface would be obviously increased if the content of NaCl in W2 is higher than 0.2%. In contrast to NaCl, the addition of Vitamin C merely slightly decrease the interfacial tension between W1/O interface. Thus, in this work the amount of NaCl is kept at 0.2% both in internal and external aqueous phases of W1/O/W2, and the effects of Vitamin C concentration in W1 on the microscopic states and appearance of the multiple emulsion are investigated. A homogeneous and stable multiple emulsion could be obtained with the encapsulation of Vitamin C at 0.75%.

Key words: W1/O/W2 multiple emulsion, interfacial tension, droplet size, viscosity, encapsulation

CLC Number: 

  • O648.2 +3