With 4,4'-diaminostilbene-2,2'-disulfphonic acid, 2,4,6-trichloro-1,3,5-triazine and N,N-dimethyldodecylamine as main raw materials, a stilbene quaternary ammonium salt intermediate was synthesised by condensation and quaternisation reaction under the catalysis of sodium hydroxide, and then reacted with two different amino acids to prepare novel amino acid-stilbene quaternary ammonium salt fluorescent whitening agents. The structures of target compounds were characterized by Fourier Transform–infrared and proton nuclear magnetic resonance spectroscopy. Their photophysical properties, whitening performance and firmness in aqueous solution were assessed by means of ultraviolet absorption spectra, fluorescence emission spectra and a cotton fibre application test. The results showed that the two amino acid-stilbene quaternary ammonium salt fluorescent whitening agents had a good whitening effect on cotton fibres and displayed strong acid resistance. Compared with the traditional fluorescent whitening agent C186, their firmness was greatly improved. The anti-bacterial activities against three strains were evaluated in vitro. The results showed that they exhibited significant anti-bacterial activity against the selected strains, and the respective minimum inhibitory concentration values against Candida albicans and Escherichia coli were 16.8 and 8.16 μg/ml.

中文翻译：

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新型氨基酸-芪季铵盐荧光增白剂：合成、光学性质、耐酸性和抗菌活性

以4,4'-二氨基芪-2,2'-二磺酸、2,4,6-三氯-1,3,5-三嗪和N,N-二甲基十二胺为主要原料合成二苯乙烯季铵盐中间体通过在氢氧化钠催化下缩合季铵化反应，再与两种不同的氨基酸反应制备新型氨基酸-茋季铵盐荧光增白剂。目标化合物的结构通过傅里叶变换红外和质子核磁共振光谱进行表征。通过紫外吸收光谱、荧光发射光谱和棉纤维应用试验对其在水溶液中的光物理性能、增白性能和牢固度进行了评价。结果表明，两种氨基酸-芪季铵盐荧光增白剂对棉纤维具有良好的增白效果，并表现出较强的耐酸性。与传统荧光增白剂C186相比，其牢固度大大提高。在体外评估了对三种菌株的抗菌活性。结果表明，它们对所选择的菌株表现出显着的抗菌活性，并且各自的最小抑菌浓度值对白色念珠菌和大肠杆菌分别为 16.8 和 8.16 μg/ml。