AOT/正庚烷、环己烷、四氢呋喃/水体系存在下Î²-胡萝卜素的紫外-可见研究

Journal of Applied Solution Chemistry and Modeling Pub Date : 2013-11-25 DOI:10.6000/1929-5030.2013.02.04.7

A. Bhattarai, H. Wilczura-Wachnik

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引用次数: 2

摘要

本文报道了在AOT/溶剂/水体系存在下，用紫外-可见技术在25℃下精确测量I² -胡萝卜素吸光度。溶剂选择:正庚烷、环己烷、四氢呋喃。AOT[气溶胶- ot(二(2-乙基己基)磺基琥珀酸钠)]的浓度在0.01 ~ 0.2mol/kg之间变化。在紫外-可见光谱配准过程中，由于不同溶剂的吸收强度不同，在各种溶剂中的I² -胡萝卜素浓度不相同。研究体系中的水浓度用R参数定义，R=[h2o]/[AOT]，等于0;5;正庚烷和环己烷中均为10,0;10和20在四氢呋喃中。得到的结果表明，随着AOT浓度的增加，I² -胡萝卜素吸光度明显降低。根据溶剂的不同，I² -胡萝卜素的吸光度有红移，其顺序如下:四氢呋喃b>环己烷b>正庚烷。结果表明，I² -胡萝卜素吸光度随体系中水浓度的增加而降低。这是因为位于胶束核心的水分子使其曲率更大，并且在AOT反胶束中形成栅栏层的烃链获得了更大的空间。因此，与没有水的系统相比，I² -胡萝卜素分子穿透了这一层。正常0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table。mso-style-name:"Table Normal";mso-tstyle-rowband-size: 0;mso-tstyle-colband-size: 0;mso-style-noshow:是的;mso-style-priority: 99;mso-style-qformat:是的;mso-style-parent:“”;mso- font - family:宋体;mso-para-margin: 0;mso-para-margin-bottom: .0001pt;mso-pagination: widow-orphan;字体大小:11.0分;字体类型:“Calibri”、“无衬线”;mso-ascii-font-family: Calibri;mso-ascii-theme-font: minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family: Calibri;mso-hansi-theme-font: minor-latin;mso-bidi-font-family:宋体;mso-bidi-theme-font: minor-bidi;}

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UV-vis Investigation of Î²-Carotene in Presence of AOT/n-Heptane, Cyclohexane, Tetrahydrofuran/Water System

The precise measurements of I²â€“carotene absorbance in presence of AOT/solvent/water systems at 25 o C by UV-vis technique are reported. The solvents selected were: n-heptane, cyclohexane, and tetrahydrofuran. The concentrations of AOT [Aerosol-OT (sodium bis (2-ethylhexyl) sulfosuccinate)] were varied from 0.01 to 0.2mol/kg. I²â€“carotene concentration in quvette during UV-vis spectrum registration was not the same in each solvents because of different absorption intensity depending on the solvent. Water concentration in the studied systems was defined by R parameter according to relation: R=[H 2 O]/[AOT] and was equal 0; 5; 10 both in n-heptane and cyclohexane, and 0; 10 and 20 in tetrahydrofuran. Obtained results showed a noticeable decreasing of I²â€“carotene absorbance as a function of AOT concentration. There is evidenced red shift of I²â€“carotene absorbance depending on the solvent in the following order: tetrahydrofuran >cyclohexane>n-heptane. Presented results show that I²â€“carotene absorbance decreased with water concentration in the system. It had been happened because the water molecules located in the core of micelles make its curvature bigger and the hydrocarbon chains forming palisade layer in AOT reversed micelles get more space. As a consequence I²â€“carotene molecules penetrated this layer dipper comparing to systems without water. Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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Journal of Applied Solution Chemistry and Modeling

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