Vesiculation of Sodium Conjugated Linoleate in Alkaline Conditions Induced by Oligomerization†

doi:10.7503/cjcu20180099

Abstract

Abstract:

The vesiculation of sodium conjugated linoleate(SCL) performed in alkaline pH range was induced by pre-oligomerization, and the average crosslinking degree of double bond within SCL molecules was controlled by UV irradiation. Oligo-SCL assembling fatty acid vesicles(FAV) were observed by transmission electron microscope(TEM) in diameter of 10—20 nm. The performance results indicated that the oligo-SCL assembling FAV had better low temperature solubility and stronger resistance to acidic and calcium conditions in comparison with SCL micelles. Moreover, sizes of the oligo-SCL assembling FAV were calcium ion responsive. Therefore, it is great theoretical significant in self-assembly of FAV and shows a good application prospect in domestic detergents and personal care products.

Key words: Conjugated linoleic acid, Fatty acid vesicle, Oligomerization, Hard water resistance, Acid resistance

CLC Number:

O648

TrendMD:

FAN Ye, ZHENG Yizhou, FANG Yun, XIA Yongmei, GAO Di, WANG Jie. Vesiculation of Sodium Conjugated Linoleate in Alkaline Conditions Induced by Oligomerization^†[J]. Chem. J. Chinese Universities, 2018, 39(7): 1483.

Figures/Tables 8

Fig.1 Effect of reaction conditions on oligomerization of SCL(10 mmol/L, pH=8.6) by UV irradiation^(A) Types of initiator; a. initial; b. BP; c. 1173; d. ITX. (B) Mass fraction of ITX(%): a. initial; b. 4.3; c. 8.2; d. 11.7; e: 23. (C) Irradiation time/h: a. initial; b. 0.5; c. 1.5; d. 2.5. (D) Oligomerization temperature/℃: a. initial; b. 25; c. 30; d. 40. All reactions were irradiated for 2.5 h except for spectra(C).

Fig.2 Average crosslinking degree of double bonds within SCL molecules in different concentrations of SCL initiated by ITX at pH=13 and 25 ℃ for 2.5 h

Fig.3 TEM images of oligo-SCL assembling FAV in different concentrations of SCL at pH=13 and the resultant crosslinking degrees data(in brackets)^c(SCL)/(mmol·L-1): (A1, A2) 30(35%); (B1, B2) 40(34.5%); (C1, C2) 50(30%); (D1, D2) 60(26%);(E1, E2) 70(25%); (F1, F2) 80(23%); (G1, G2) 90(22.6%); (H1, H2) 100(22.3%).

Fig.4 Schematic illustration of relationship between packing parameters(P) and the oligo-SCL assembling FAV

Fig.5 Acid resistance comparison of SCL solutions(10 mmol/L) pre(a) and post(b) oligomerization(A) and TEM images of oligo-SCL(100 mmol/L) assembling FAV at pH=8.6(B), pH=10.5(C) and pH=13(D)

Fig.6 Digital photographs of SCL solutions post(A—C) and pre(D—G) oligomerization by adding different dosages of SDS^c(SDS)/(g·L-1): (A) 0.47(clear); (B) 0.24(clear); (C) 0.12(cloudy); (D) 0.94(semitransparent);(E) 0.71(semitransparent); (F) 0.47(cloudy); (G) 0.24(cloudy).

Fig.7 Size distribution of CLA assembling FAV(A) and Ca2+-responsive size variation of oligo-SCL assembling FAV with an average crosslinking degree of 30%(B) at pH=8.6^c(Ca2+)/(mmol·L-1): a. 0.2; b. 0.6; c. 1.2.

Fig.8 Schematic illustration of the enhanced mechanism of acid resistance, lime soap resistance and calcium responsiveness

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