Interaction of 4-aminosalicylic Acid and Surfactants in Aqueous Solutions Using UV-Vis Spectra and Steady-state Fluorescence Spectroscopy

• Published in: Journal of Wuhan University of Technology. Materials science edition 2011-10, Vol.26 (5), p.879-882
• Main Authors: Xu, Dongying, Ren, Jiaoyan, Liao, Zhengfu, Wang, Hui, Zhao, Mouming, Li, Guangji
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Chemistry and Materials Science; Doppler effect; Electrostatics; Fluorescence; Materials Science; Red shift; Spectra; Spectroscopy; Surfactants; 可见光谱; 氨基水杨酸; 水溶液; 相互作用; 稳态; 紫外; 荧光光谱; 阳离子表面活性剂
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-011-0329-7

The interactions of 4-aminosalicylic acid （4-ASA） and surfactants in aqueous solutions were investigated by using UV-Vis spectra and steady-state fluorescence spectroscopy.The results showed that the strongest peak at UV-vis spectra of 4-ASA aqueous solution in the presence of cationic surfactant and cetyltrimethyl ammonium bromide （CTAB） appeared at 206 nm and took a red shift from 206 nm to 221 nm with the increase of 4-ASA concentrations from 0.8×10-5 to 4.4×10-4 mol/L.Similarly,the strongest peak at UV-vis spectra of 4-ASA aqueous solution in the presence of nonionic surfactant and polyvinylpyrrolidone （PVP） appeared at 206 nm and took a red shift from 206 nm to 219 nm with the increase of 4-ASA concentrations from 0.8×10-5 to 4.4×10-4 mol/L.However,the similar phenomena did not appeared in the presence of anion surfactant,sodium dodecyl sulfate （SDS）,the UV-vis spectra of 4-ASA aqueous solution remained the same peak position and the peak value increased with the 4-ASA concentration increase.The results could be attributed to the electrostatic attraction between 4-ASA and CTAB or PVP,as well as the electrostatic repulsion between 4-ASA and SDS.Furthermore,the value of critical micelle concentration （CMC） of surfactants in the presence of 4-ASA was determined with Fluorescence method.The first and second CMC of CTAB was 1.2×10-4 M and 2.4×10-4 M,respectively.The first and second CMC of PVP was 1.2×10-4 M and 2.8×10-4 M.SDS realized the multiple micellizations to form multiple CMC.