Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (9): 2164.doi: 10.7503/cjcu20130299

• Physical Chemistry • Previous Articles     Next Articles

Stability and Release Properties of Drug-loaded Pickering Emulsions by the Modified Sodium Alginate Activated SiO2 Nanoparticles

YAN Hui-Qiong1, LI Jia-Cheng1, FENG Yu-Hong1, HU Wen-Tao1, LIU Ruo-Lin1, LIN Qiang1,2   

  1. 1. Department of Chemistry, College of Materials and Chemical Engineering, Hainan University, Haikou 570228, China;
    2. Department of Chemistry, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571100, China
  • Received:2013-04-01 Online:2013-09-10 Published:2013-08-30

Abstract:

Pickering emulsions(W/O) loaded cyhalothrins were prepared by SiO2 nanoparticles whose surface were activated using amphiphilic alginate derivative hydrophobically modified by cholesterol under the conditions of high speed stirring. And they were characterized by means of Fourier transform infrared spectroscopy(FTIR),1H nuclear magnetic resonance(1H NMR), fluorescence spectrum, dynamic light scattering, optical microscope and release studies. Experimental results showed that cholesterol groups had successfully grafted to the alginate molecular chains. The critical aggregation concentration of modified alginate was reduced from 1.26 mg/L to 0.28 mg/L, which showed good amphipathy. Alginate derivative(CSAD) and surfactant CTAB could be also adsorbed on the surface of SiO2 nanoparticles with the corresponding zeta potential which were 16.4 and -30.7 mV, respectively. And the particle sizes were 583.3 and 438.4 nm, respectively. The release rate of the Pickering emulsions prepared by the SiO2 particles activated by CSAD was more slowly. That may be the cross-linking action of CSAD which made the activated SiO2 particles adsorbed on the oil-water interface form the relatively stable network structures or the interface membranes.

Key words: Cyhalothrin, Sodium alginate, Cholesterol, Amphipathic, Pickering emulsion, SiO2 nano-particles, Cholesteryl grafted sodium alginate derivative(CSAD)

CLC Number: 

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