Determination of Critical Micelle Concentration of Alkyl Polyglucoside(APG) Nonionic Surfactant Aqueous System By Multi-Peaks Gaussian Fitting of Visible Absorption Spectra Line Shape
Abstract：A multi-peaks Gaussian fitting on the line shape of visible spectra was used to determine the critical micelle concentration (CMC) of alkyl polyglucoside(APG) nonionic surfactant aqueous system such as octyl beta D mono-glucoside(C8G1) and decyl beta D mono-glucoside(C10G1). Visible electronic absorption spectra of a series of different concentration C8G1 or C10G1 with crystal violet(CV) used as a probe were measured respectively and characterized by the overlap of the principal peak with λmax at 598-609 nm and a shoulder at 538-569 nm assigned to monomer and dimer CV respectively. A multi-peaks Gaussian fitting was used to interpret the spectra and give relative integrating absorbance(A2/A1) of two peaks,red-shift(Δλ) and half-width. A sudden change occurred at CMC in the curves of the relative integrating absorbance(A2/A1),red-shift(Δλ) and half-width (w1,w2) versus the C8G1 or C10G1 surfactant concentrations. Significantly the dependence of the CMC upon the half-width was observed for the first time and successfully used to determine CMC of nonionic surfactant such as APG.
[1] Mukerjee P,Mysels K. Critical Micelle Concentrations of Aqueous Surfactant Systems. National Standards Reference Data Series，Vol. 36,National Bureau of Standards(U.S.)，1971. 8,79. [2] Laurier L Schramm. Surfactants.London： Cambridge University Press，2000. 3. [3] ZHAO Guo-xi(赵国玺). Principles of Surfactant Action(表面活性剂作用原理). Beijing： Light Industry Press(北京： 轻工业出版社)，2003. 242. [4] HUANG Chuan-jing(黄传敬). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2000，20(2)： 252. [5] Dipankar Bhadra，Sulekha Bhadra，Jain N K. J. Pharm. Pharaceut. Sci.,2005，8(3)： 467. [6] DONG Shu-li，et al(董姝丽,等). Analysis and Testing Technology and Instruments(分析测试技术与仪器)，1996，2(4)： 33. [7] William Spivak，Chet Morrison，Dana Devinuto,et al. Biochemical Journal，1988，252： 275. [8] SUN Gui-ling，LIU Bo，LI Wei-xiang,et al(孙桂玲,刘 波,李维祥，等). Acta Scientiarun Naturaltium Universitatis Nankaiensis(南开大学学报·自然科学版)，2004，37(4)： 115. [9] ZHOU Jian-ping(周剑平). Proficiency in Origin7.0(精通Origin7.0). Beijing： Beijing University of Aeronautics and Astronautics Press(北京： 北京航空航天大学出版社)，2004. 211. [10] HE Ying-hong,CHENG Juan,ZUO Yi,et al(贺应红,程 娟,左 毅,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2005，25(5)： 648.
