Welcome to China Surfactant Detergent & Cosmetics, Today is

China Surfactant Detergent & Cosmetics ›› 2025, Vol. 55 ›› Issue (7): 861-870.doi: 10.3969/j.issn.2097-2806.2025.07.006

• Development and application • Previous Articles     Next Articles

Study on the phase behavior of mixed systems of cocoyl glycinate surfactants

Xin Duan1,2,Yanan Zhang1,2,Jiajia Gao1,2,Wanping Zhang1,2,Qianjie Zhang1,2,*()   

  1. 1. Division of Perfume and Cosmetics, Shanghai Institute of Technology, Shanghai 201418, China
    2. Collaborative Innovation Center of Fragrance Flavour and Cosmetics, Shanghai 201418, China
  • Received:2024-10-07 Revised:2025-06-12 Online:2025-07-22 Published:2025-07-23
  • Contact: *E-mail: zhangqj_sit@126.com

Abstract:

The phase behaviors of single systems of sodium cocoyl glycinate (SCG) and potassium cocoyl glycinate (GCK), as well as the mixed systems of SCG/GCK and SCG/GCK/cocamidopropyl hydroxysultaine (CHSB), were investigated at pH 6.5. The results of binary phase diagram showed that the Krafft temperature of GCK was significantly lower than that of SCG, and the micellar region for GCK was considerably larger than SCG. When SCG and GCK were mixed at a mass ratio of 1:1, the phase behavior of the mixed system was similar to that of single GCK, indicating that the addition of GCK had improved the solubility of SCG. The results of ternary phase diagram showed that the addition of CHSB made the phase behavior of the mixed system more diverse. The addition of CHSB resulted in a further shrink of the undissolved region. There were regions of spherical, rod-like, worm-like and hexagonal micellar phases in the phase diagram of mixed system of SCG/GCK/CHSB. An in-depth study on the self-assembly behavior of cocoyl glycinate surfactants could provide theoretical support for the development of new amino acid-based cleansing and care products.

Key words: sodium cocoyl glycinate, potassium cocoyl glycinate, mixed system, phase behavior

CLC Number: 

  • TQ423