Amino acid-based surfactants are emerging as important biocompatible and eco-friendly surfactants. This work explores C₁₂ and C₁₄ γ-alkyl aspartic acid surfactants to understand their preparation, micellization, and surface properties, including critical micelle concentration (CMC), surface tension at CMC, thermodynamic properties, and biodegradation. A duration of 24 h produced the highest yield for the synthesis of γ-alkyl aspartate from C₁₂ and C₁₄ fatty alcohols and aspartic acid. Their chemical structures were identified using elemental analysis, FT-IR, and ¹H and ¹³C-NMR. Synthesized sodium γ-tetradecyl aspartate (SGTdA) possessed a lower CMC value than synthesized sodium γ-dodecyl aspartate (SGDdA). However, a higher biodegradability was observed for the shorter-chain surfactant (SGDdA)_, that is, 84.6% in 7 days using activated sludge as a secondary effluent. In addition, the effect of inorganic and organic salts on the interfacial properties of surfactants was studied. It was observed that salts are very effective and active in reducing the CMC of surfactants.

中文翻译：

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无机和有机电解质对合成 γ-烷基（C12 和 C14）天冬氨酸胶束化的影响

氨基酸类表面活性剂正在成为重要的生物相容性和生态友好型表面活性剂。这项工作探索了 C ₁₂和 C ₁₄ γ-烷基天冬氨酸表面活性剂，以了解它们的制备、胶束化和表面性质，包括临界胶束浓度 (CMC)、CMC 的表面张力、热力学性质和生物降解。_{对于由 C 12}和 C ₁₄脂肪醇和天冬氨酸合成 γ-烷基天冬氨酸，24 小时的持续时间产生了最高产率。^{使用元素分析、FT-IR 和1} H 和¹³鉴定了它们的化学结构C-核磁共振。合成的γ-十四烷基天冬氨酸钠（SGTdA）的CMC值低于合成的γ-十二烷基天冬氨酸钠（SGDdA）。然而，对于短链表面活性剂 (SGDdA) _，观察到更高的生物降解性，即使用活性污泥作为二级出水在 7 天内可降解 84.6%。此外，还研究了无机盐和有机盐对表面活性剂界面性质的影响。据观察，盐在降低表面活性剂的 CMC 方面非常有效且具有活性。