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

doi:10.19894/j.issn.1000-0518.210185

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.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 author:xu6209@163.com
Supported by:
the National Natural Science Foundation of China(52004102);the Natural Science Foundation of Jiangsu Province(BK20190605)

Abstract

Abstract:

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

CLC Number:

O647.1

Ying LI, Yun ZHANG, Liang-Liang LIN, Hu-Jun XU. Synergistic Effect of Ternary Compound System of Sodium N‑Lauroyl Methylalanine[J]. Chinese Journal of Applied Chemistry, 2022, 39(8): 1262-1273.

Figures/Tables 12

Fig.1 γ-lgc curves of SLMA/LAB binary compound system in different proportions at 25 ℃x1 is the molar fraction of SLMA in the solution phase； SLMA is N?lauroyl methylalanine sodium； LAB is lauramide propyl betaine

Table 1 Surface activity parameters of the SLMA/LAB binary compound system

x₁	CMC/（mol·L^-1）	γ_CMC/（mN·m^-1）	pc₂₀	CMC/c₂₀	Γ_max/（μmol·m^-2）	A_min/nm²	A_ideal，min/nm²
0	1.066×10^-3	35.80	3.69	5.22	3.95	0.42	0.42
0.1	1.065×10^-3	28.10	3.86	7.71	4.72	0.35	0.44
0.3	1.054×10^-3	28.00	3.88	8.00	4.65	0.36	0.44
0.5	9.139×10^-4	29.50	3.98	8.63	4.21	0.39	0.45
0.7	1.060×10^-3	29.60	3.91	8.52	4.22	0.39	0.45
0.9	1.827×10^-3	29.50	3.82	12.15	3.63	0.46	0.46
1	7.913×10^-3	32.40	3.10	9.98	3.43	0.48	0.48

Table 2 Intermolecular interaction parameters of the SLMA/LAB binary compound system

x₁	x₁^m	β^m	$l n c 1 m / c 2 m$	x₁^σ	β^σ	$l n c 10 / c 20$	β^σ-β^m	$l n c 10 / c 20 / c 1 m / c 2 m$
0.1	0.09	-2.21	2.00	0.23	-4.37	1.36	-2.15	0.65
0.3	0.20	-2.52	2.00	0.32	-4.01	1.36	-1.50	0.65
0.5	0.33	-3.95	2.00	0.40	-5.08	1.36	-1.12	0.65
0.7	0.41	-4.16	2.00	0.46	-5.01	1.36	-0.84	0.65
0.9	0.52	-3.89	2.00	0.55	-5.89	1.36	-2.00	0.65

Table 2 Intermolecular interaction parameters of the SLMA/LAB binary compound system

x₁	x₁^m	β^m	$l n c 1 m / c 2 m$	x₁^σ	β^σ	$l n c 10 / c 20$	β^σ-β^m	$l n c 10 / c 20 / c 1 m / c 2 m$
0.1	0.09	-2.21	2.00	0.23	-4.37	1.36	-2.15	0.65
0.3	0.20	-2.52	2.00	0.32	-4.01	1.36	-1.50	0.65
0.5	0.33	-3.95	2.00	0.40	-5.08	1.36	-1.12	0.65
0.7	0.41	-4.16	2.00	0.46	-5.01	1.36	-0.84	0.65
0.9	0.52	-3.89	2.00	0.55	-5.89	1.36	-2.00	0.65

Fig.2 γ-lgc curves of SLMA/LAB/APG ternary compound system in different proportions at 25 ℃Note：x1' is the molar fraction of SLMA/LAB with molar ratio of 3∶7 in the solution phase； APG is alkyl glycoside

Table 3 Surface activity parameters of the SLMA/LAB/APG ternary compound system

$x 1'$	CMC/（mol·L^-1）	γ_CMC/（mN·m^-1）	pc₂₀	CMC/c₂₀	Γ_max/（μmol·m^-2）	A_min/nm²	A_ideal，min/nm²
0	1.812×10^-4	28.90	4.42	4.81	5.93	0.28	0.28
0.1	1.293×10^-4	28.60	4.71	6.63	4.99	0.33	0.30
0.3	1.595×10^-4	28.50	4.61	6.57	5.04	0.33	0.31
0.5	2.166×10^-4	28.60	4.50	6.90	4.89	0.34	0.31
0.7	2.740×10^-4	28.60	4.42	7.17	4.79	0.35	0.32
0.9	5.793×10^-4	28.60	4.18	8.73	4.36	0.38	0.33
1	1.040×10^-3	28.00	3.93	8.79	4.65	0.36	0.36

Table 3 Surface activity parameters of the SLMA/LAB/APG ternary compound system

$x 1'$	CMC/（mol·L^-1）	γ_CMC/（mN·m^-1）	pc₂₀	CMC/c₂₀	Γ_max/（μmol·m^-2）	A_min/nm²	A_ideal，min/nm²
0	1.812×10^-4	28.90	4.42	4.81	5.93	0.28	0.28
0.1	1.293×10^-4	28.60	4.71	6.63	4.99	0.33	0.30
0.3	1.595×10^-4	28.50	4.61	6.57	5.04	0.33	0.31
0.5	2.166×10^-4	28.60	4.50	6.90	4.89	0.34	0.31
0.7	2.740×10^-4	28.60	4.42	7.17	4.79	0.35	0.32
0.9	5.793×10^-4	28.60	4.18	8.73	4.36	0.38	0.33
1	1.040×10^-3	28.00	3.93	8.79	4.65	0.36	0.36

Table 4 Intermolecular interaction parameters of the SLMA/LAB/APG ternary compound system

$x 1'$	$x 1 m$	$β m$	$l n c 1 m / c 2 m$	$x 1 σ$	$β σ$	$l n c 10 / c 20$	$β σ - β m$	$l n c 10 / c 20 / c 1 m / c 2 m$
0.1	0.21	-4.56	1.75	0.28	-5.49	1.14	-0.93	0.60
0.3	0.25	-3.04	1.75	0.33	-3.65	1.14	-0.61	0.60
0.5	0.29	-2.04	1.75	0.38	-2.71	1.14	-0.68	0.60
0.7	0.39	-1.99	1.75	0.47	-2.58	1.14	-0.59	0.60
0.9	0.58	-0.82	1.75	0.64	-1.79	1.14	-0.98	0.60

Table 4 Intermolecular interaction parameters of the SLMA/LAB/APG ternary compound system

$x 1'$	$x 1 m$	$β m$	$l n c 1 m / c 2 m$	$x 1 σ$	$β σ$	$l n c 10 / c 20$	$β σ - β m$	$l n c 10 / c 20 / c 1 m / c 2 m$
0.1	0.21	-4.56	1.75	0.28	-5.49	1.14	-0.93	0.60
0.3	0.25	-3.04	1.75	0.33	-3.65	1.14	-0.61	0.60
0.5	0.29	-2.04	1.75	0.38	-2.71	1.14	-0.68	0.60
0.7	0.39	-1.99	1.75	0.47	-2.58	1.14	-0.59	0.60
0.9	0.58	-0.82	1.75	0.64	-1.79	1.14	-0.98	0.60

Fig.3 Micro-polarity curves of the SLMA/LAB binary compound system in different proportions at 25 ℃Note：x1 is the molar fraction of SLMA in the solution phase

Fig.4 Micro-polarity curves of SLMA/LAB/APG ternary compound system in different proportions at 25 ℃Note：x1' is the molar fraction of SLMA/LAB with molar ratio of 3∶7 in the solution phase

Fig.5 The average hydrodynamic radius and micelle distribution of the SLMA/LAB binary compound system and single components at 25 ℃ （x1 is the molar fraction of SLMA in the solution phase）

Fig.6 The average hydrodynamic radius and micelle distribution of the SLMA/LAB/APG ternary compound system and single components at 25 ℃ （x1' is the molar fraction of SLMA/LAB with molar ratio of 3∶7 in the solution phase）

Table 5 The number of micelle aggregation in the SLMA/LAB binary compound system

x₁	0	0.1	0.3	0.5	0.7	0.9	1
N_m	45	40	44	41	38	35	47

Table 6 The number of micelle aggregation in the SLMA/LAB/APG ternary compound system

$x 1'$	0	0.1	0.3	0.5	0.7	0.9	1
N_m	49	31	34	42	37	35	44

Table 6 The number of micelle aggregation in the SLMA/LAB/APG ternary compound system

$x 1'$	0	0.1	0.3	0.5	0.7	0.9	1
N_m	49	31	34	42	37	35	44

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

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