TY  - BOOK
AU  - Safaa Hussein Salah Eldin Hussein
AU  - Amal Mahmoud Aboualalamein , 
AU  - Fawzi Alanwar , 
AU  - Hanan Mohamed Elwy , 
TI  - Analytical and stability study of some unstable materials used in cosmetic preparations with toxic or harmful degradation products / 
PY  - 2018///
CY  - Cairo : 
PB  - Safaa Hussein Salah Eldin Hussein , 
KW  - Avobenzone
KW  - Imidazolidinyl urea
KW  - Octinoxate
N1  - Thesis (M.Sc.) - Cairo University - Faculty of Pharmacy - Department of Analytical Chemistry; Issued also as CD
N2  - This thesis includes five parts:  Part Ї: General introduction and literature review Part ЇЇ: Spectrophotometric methods for simultaneous determination of Avobenzone and Octinoxate in a mixture. This part includes four sections 1- Derivative spectrophotometry technique which involves two methods -First derivative spectrophotometry  -First derivative of ratio spectra spectrophotometry 2- Ratio difference spectrophotometry. 3- Mean Centering Spectrophotometry  4- Modified Vierordt{u2019}s method  Part ЇЇЇ: Chemometric methods for simultaneous determination of Avobenzone and Octinoxate in a mixture. Part ЇV: Chromatographic techniques, this part includes two sections Section A. Thin Layer Chromatographic Methods A.1. TLC{u2013} densitometric method for determination of Imidazolidinyl urea / Diazolidinyl urea in presence of its toxic degradation product; Formaldehyde. A.2. HPTLC- densitometric method for determination of Avobenzone / Octinoxate simultaneously by in presence of Paraben. Section B. High Performance Liquid Chromatographic Methods B.1. Stability indicating method for determination of Imidazolidinyl urea / Diazolidinyl urea in mixture with other preservatives by RP-HPLC method. B.2. Determination of Avobenzone and Octinoxate simultaneously in presence of their alkaline, acidic and photo-degradation products by RP-HPLC. Part V: Electrochemical techniques -Kinetic study of Chlorhexidine using ion selective electrode The thesis refers to 202 references, contains 77 tables and 69 figures
UR  - http://172.23.153.220/th.pdf
ER  -