Norhamizah Johari creator text theses my Kuantan, Pahang UMP 2012 monographic eng

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xiii, 38 p. : ill. ; 30 cm. + 1 CD-ROM 1,3,7- trymethylxanthine (caffeine) is a naturally occurring substance found in cocoa seeds. The purpose of this research is to extract caffeine from Klon Koko Malaysia (KKM)22, to investigate the effect of particle size, solvent/feed ratio and extraction time, and also to determine the kinetic model for extraction of 1,3,7-trymethylxantine. The sample was prepared by grinding and sieving, followed by solid-liquid extraction using water by heat reflux extracting technique, liquid-liquid extraction with ethyl acetate, drying of caffeine by rotary evaporator, and finally analysis of the caffeine yield. The analysis of the caffeine yield was done using UV/Vis Spectrophotometric method. The caffeine yield was highest at sample particle size of 315 μm (0.22 % w/w caffeine or 2.1724 mg/g cocoa), solvent/feed ratio of 1:1 (0.22 % w/w caffeine or 2,2102 mg/g cocoa), and extraction time of 90 minutes (0.23 % w/w caffeine or 2.288 mg/g cocoa). The best conditions for the highest yield of caffeine from KKM22 were 315 μm of sample particle size, 1:1 of solvent/feed ratio, and 90 minutes of extraction time. specialized Norhamizah Johari Project paper (Bachelor of Chemical Engineering) -- Universiti Malaysia Pahang - 2012 Bibliography : p. 27-29 Extraction (Chemistry) Caffeine THE0004057(Local) UMP 121219 20251114204526.0 vtls000067873