天然环保型油茶皂苷与椰油酰甘氨酸钠二元复配体系协同作用性能研究

doi:10.3969/j.issn.2097-2806.2025.07.003

Abstract

Abstract:

Sodium cocoyl glycinate （SCG）, an environmentally friendly anionic amino acid surfactant, is widely used in daily chemical products as an upgraded alternative to traditional surfactants. In this study, crude Camellia oleifera saponin （COS） was purified using AB-8 macroporous adsorption resin, and its composition and structure were analyzed. The effects of different mole fractions of COS （α_COS） on surface tension （γ）, oil-water interfacial tension （IFT）, emulsification, and foam properties of COS-SCG binary mixed systems were investigated in mixtures of SCG with purified COS. The stability of γ and foamability under diverse environmental conditions were also discussed. The results indicated that the COS-SCG system exhibited remarkable surface-active synergism. The minimum critical micelle concentration （cmc） of the mixed system was lower than that of SCG, and adding a small mole fraction of COS （1%-2%） induced a synergistic reduction of γ. Specifically, the cmc and γ were 2.50×10^-4 mol/L and 23.1 mN/m for α_COS=1%, respectively. The system exhibited exceptional IFT reduction capacity, achieving a minimum value of 1.42 mN/mat α_COS=10%. The mixed system reached a foaming volume （at α_COS=50%） and foam stability （at α_COS=75%） were 51.0 mL and 97.37%, respectively. Microscopic analysis further confirmed these outstanding foam properties. Moreover, the COS-SCG system displayed reduced γ with enhanced foaming volume under elevated temperatures （35-75 ℃） and salinity （0-20 g/L）. However, acidic conditions and hard water compromised both γ stability and foamability.

Key words: saponin, sodium cocoyl glycinate, binary mixed system, synergism, interfacial tension, foam properties

CLC Number:

TQ423

Yawen Li, Weixin Li, Fenglun Zhang, Shihong Ma, Jianxin Jiang, Liwei Zhu. Synergistic properties of the binary mixed system of natural green surfactants: Camellia oleifera saponin and sodium cocoyl glycinate[J].China Surfactant Detergent & Cosmetics, 2025, 55(7): 831-843.

Figures/Tables 12

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References 27

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Sample	Crude COS	Purified COS
Glucose/%	3.72±0.26	4.48±0.24
Xylose/%	4.90±0.26	30.58±0.56
Arabinose/%	2.63±0.13	—
Rhamnose/%	3.26±0.17	—
Sapogenins/%	28.90±0.22	54.81±0.42
Purity/%	43.41±1.05	89.87±1.22

α_COS/%	γ_cmc/ （mN/m）	cmc₃/ （mol/L）	x_m	β^m	ln （cmc₁/cmc₂）
0	24.2	2.50×10^-2	—	—	—
1	23.1	2.50×10^-4	0.48	-17.46	-3.69
2	23.5	5.00×10^-4	0.49	-13.36	-3.69
5	25.9	1.25×10^-3	0.54	-7.87	-3.69
8	24.7	2.00×10^-3	0.59	-4.95	-3.69
10	26.3	2.50×10^-3	0.64	-3.47	-3.69
30	32.6	1.38×10^-3	0.77	-2.99	-3.69
50	36.0	1.00×10^-3	0.85	-2.77	-3.69
75	38.0	7.58×10^-4	0.92	-2.70	-3.69
100	40.7	6.25×10^-4	—	—	—

Time/min	Diameter/μm
Time/min	SCG	α_COS=1%	α_COS=50%	COS
0	62.97	47.56	78.01	74.50
30		74.47	96.09	81.06

Synergistic properties of the binary mixed system of natural green surfactants: Camellia oleifera saponin and sodium cocoyl glycinate

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