结晶型氨基酸洁面膏稳定性的条件和机理——多元醇的作用

doi:10.3969/j.issn.1001-1803.2021.05.006

Abstract

Abstract:

The influences of four polyols （glycerin, 1,3-butylene glycol, PEG-400 and dipropylene glycol） on the stability of crystalline facial cleansing cream based on potassium cocoyl glycinate were investigated. SAXS results displayed lamellar liquid crystal structure of N-cocoyl glycine/potassium N-cocoyl glycinate in aqueous phase. The addition of glycerin increased the interlayer spacing of lamellar, transferring the microstructure towards lamellar liquid crystal structure with broader interlayer spacing. No obvious increasing of the interlayer spacing of lamellar structure was observed with the addition of dipropylene glycol. PEG-400 destroyed the lamellar liquid crystal structure. DSC results revealed that the addition of polyols could elevate the crystallizing temperature. The sequence of impacts was 1,3-butylene glycol>glycerin>PEG-400>dipropylene glycol. In contrast to the rough broad peak of 1,3-butylene glycol system in DSC, the formulation with glycerin showed narrow and clean peak, which indicated that the crystal structure formed with glycerin was uniform and fine. Therefore, glycerin promoted the formation of a more stable layered gel phase and promoted uniform solid crystallization in the system, and the stable coexistence of the two maintained the stability of the crystal-type facial cleansing cream based on potassium cocoyl glycinate.

Key words: potassium N-cocoyl glycinate, polyol, lamellar liquid crystal, stability

CLC Number:

TQ658

TANG Xiao-qin,CHEN Ming-hua. Conditions and mechanism for stability of crystalline N-cocoyl glycinate-based facial cleansing cream: Effects of polyols[J].China Surfactant Detergent & Cosmetics, 2021, 51(5): 408-412.

Figures/Tables 8

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References 6

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相	原料名称	w/%
相	原料名称	P-1	P-2	P-3	P-4	P-5
A	去离子水	至100	至100	至100	至100	至100
	EDTA-2Na	0.1	0.1	0.1	0.1	0.1
	柠檬酸	2.8	2.8	2.8	2.8	2.8
B	椰油酰甘氨酸钾	30	30	30	30	30
C	甘油	—	45	—	—	—
	PEG-400	—	—	45	—	—
	二丙二醇	—	—	—	45	—
	丁二醇	—	—	—	—	45

缔合结构		偏光显微镜表征	层间距之比
六角棱形			1：$\frac{1}{\sqrt{3}}$：$\frac{1}{\sqrt{4}}$：$\frac{1}{\sqrt{7}}$
层状			1∶$\frac{1}{2}$∶$\frac{1}{3}$∶$\frac{1}{4}$
反向六角棱形			1：$\frac{1}{\sqrt{3}}$：$\frac{1}{\sqrt{4}}$：$\frac{1}{\sqrt{7}}$

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Conditions and mechanism for stability of crystalline N-cocoyl glycinate-based facial cleansing cream: Effects of polyols

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