Document Details

Document Type : Thesis 
Document Title :
Analysis of Some Food Colorants and Some Selected Oxyions in Different Environmental Samples
تحليل بعض ملونات ألأطعمة وبعض ايونات الأوكسي في الأوساط البيئية المختلفة
 
Subject : Chemistry department 
Document Language : Arabic 
Abstract : Within the frame work of the present thesis, the work can be summarized as follow: i. Separation and subsequent determination of some selected food colorants (Tartrazine,Sunset yellow and Allura red ) by high temperature liquid chromatography (HPLC) were achieved successfully. The developed method was based on the modification of a C18 column with Triton X-100 –aqueous solution (0.025 v/v) and usage of the same surfactant solution as a mobile phase without any organic solvent as modifier. The developed method could be classified as green chemistry. ii. Various analytical parameters that controlled HPLC performance e.g. pH, which affects the performance of chromatographic separation as retention time, peak width, area under peak and symmetry factor of peak separation were critically studied and properly assigned. iii. High temperature (70°C) has improved the separation of the food colorants by Triton X-100 at pH 6.4 as an efficient mobile phase. However, the tested food colorants were decomposed at 120 °C due to their instabilities at high temperature. iv. Pure water was successfully used as a mobile phase at optimized temperature to reduce the medium viscosity and back pressure and enhancing mass transfer. v. Nonlinear Van’t Hoff plot was achieved due to change in retention mechanism, stationary phase and mobile phase properties.. vi. The figures of merits of the tested food colorants by the developed HPLC were determined. vii. An excellent spectrophotometric method for the determination of the oxyions tungstate in water has been developed. The proposed method was based upon formation of the binary ion associate of tungstate (WO42-) with the ion pairing reagent procaine hydrochloride (PQH+•.Cl−.) and measuring the subsequent quenching. The effect parameters that control the associate formation was critically assigned and optimized. The data was successfully validated by comparison with inductively coupled plasma-optical emission spectrometry. 
Supervisor : Dr.Lateefa Al Khateeb 
Thesis Type : Master Thesis 
Publishing Year : 1433 AH
2012 AD 
Added Date : Saturday, July 14, 2012 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
وعـد سليمان الحربيAl Harbi, Waad SulimanResearcherMaster 

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