TY  - BOOK
AU  - Eman Adel Hassan Rend 
AU  - Adel Bassiouny Elsayed Shehata , 
AU  - Mahmoud Sabry Mohamed Rizk , 
TI  - Production and evaluation of caffeine certified reference materials for its assessment in milk chocolate and coffee / 
PY  - 2015///
CY  - Cairo : 
PB  - Eman Adel Hassan Rend  , 
KW  - Referenc material and Homogeneity Study
KW  - Caffeine
KW  - Milk chocolate
N1  - Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Analytical chemistry; Issued also as CD
N2  - 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
ER  -