Eman Adel Hassan Rend  <br/><br/>
Production and evaluation of caffeine certified reference materials for its assessment in milk chocolate and coffee /  
 إنتاج وتقييم مواد مرجعية للكافيين لإستخدامها فى تقييم شيكولاتة الحليب والقهوة 
Eman Adel Hassan Rend ; Supervised Mahmoud Sabry Mohamed Rizk  , Adel Bassiouny Elsayed Shehata  
 - Cairo :   Eman Adel Hassan Rend  ,   2015 
 - 109 P. :   charts ;   25cm 
<br/><br/>Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Analytical chemistry 
<br/><br/> Reference materials are important tool in chemical analysis in terms of  provision of traceability of the measurement results to the SI units. A Pure  substance certified reference material from caffeine and matrix certified  reference material of milk chocolate were developed for the content of  caffeine and theobromine, theophylline and caffeine respectively.  Homogeneity and stability of the prepared reference materials were studied  and characterization was done by two independent analytical methods. The  measurement results were statistically treated and the certified values of  caffeine is 99.862 %±0.649 in pure substance certified reference material  (caffeine) and they were 1393.2± 21.569, 0.499 ±0.054 and 112.48±3.897  mg/kg for theobromine, theophylline and caffeine in milk chocolate  certified reference material which makes the candidate reference materials  very useful as a calibrant and for quality achievement in chemical analysis  
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<br/><br/><label>Subjects--Topical Terms: </label><br/>Referenc material and Homogeneity Study
<br/><br/><label>Subjects--Index Terms: </label>Caffeine Milk chocolate