Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (8): 1262-1273.DOI: 10.19894/j.issn.1000-0518.210185

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Synergistic Effect of Ternary Compound System of Sodium N‑Lauroyl Methylalanine

Ying LI2, Yun ZHANG1, Liang-Liang LIN2, Hu-Jun XU2()   

  1. 1.Suzhou Greenleaf Daily Commodity Co. ,Ltd,Suzhou 215151,China
    2.School of Chemistry and Materials Engineering,Jiangnan University,Wuxi 214122,China
  • Received:2021-04-13 Accepted:2021-08-28 Published:2022-08-01 Online:2022-08-04
  • Contact: Hu-Jun XU
  • About
  • Supported by:
    the National Natural Science Foundation of China(52004102);the Natural Science Foundation of Jiangsu Province(BK20190605)


Sodium N?lauroyl methylalanine (SLMA) was mixed with lauramide propyl betaine (LAB) and alkyl glycosides (APG1214) in binary and ternary compounds, respectively. The synergistic effect and the influence of solution composition on its micropolarity, average hydrodynamic radius and the number of micelles between SLMA/LAB binary compound system and SLMA/LAB/APG ternary compound system were studied, through the hanger method, steady-state fluorescence probe method, dynamic light scattering and steady-state fluorescence quenching method. The interaction parameters of the binary and ternary compound systems were calculated using the normal solution theory. The results show that both SLMA/LAB binary compound system and SLMA/LAB/APG ternary compound system have a comprehensive synergistic effect, and the best molar ratios are 3∶7 for both SLMA∶LAB and SLMA/LAB∶APG1214, corresponding to 1.054×10-3 mol/L and 1.595×10-4 mol/L of the critical micelle concentration (CMC). The SLMA/LAB binary compound system tends to form concentrated single-morph aggregates, and the overall size is small. The SLMA/LAB/APG ternary compound system has a wider distribution than the single system, and its micelle volume is obviously greater than that of binary compound system. The aggregate number of micelles formed by the two compound systems is less than that of the single system, forming a more compact, stable and smaller micelle structure. The interaction force between the surfactant molecules in the SLMA/LAB binary compound system and the SLMA/LAB/APG ternary compound system accelerates the formation of stable micelles. The micelles have a wide size distribution and exist in the form of spherical and non-spherical micelles, and the compound system forms a tighter micelle structure.

Key words: Amino acid surfactant, Compound system, Ternary compound, Synergistic effect

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