Evaluasi Kadar Vitamin C Pada Buah Naga Putih (Hylocereus Undatus) Dan Buah Naga Kuning (Selenicereus Megalanthus) Dengan 2,6 Diklorofenolindofenol

Dragon fruit is a popular newcomer in Indonesia, beside of its interesting look, also contains various beneficial compounds such as Vitamin C. The most popular is Hylocereus undatus (white dragon fruit), and Selenicereus megalanthus (yellow dragon fruit). Those two species might contain different total concentration of vitamin C. This research was to determine the vitamin C concentration of White Dragon Fruit and Yellow Dragon Fruit. Vitamin C concentration was determined using 2,6 diclorofenolindophenol titration for three times replication. The data was then analyzed by T-test. The result showed that there was significant different of vitamin C content between white dragon fruit (mean 10,71403 mg/100g with SD=0,5270612) and yellow dragon fruit (mean 12,54929mg/100g with SD=1,0806851). Keywords: Vitamin C, White Dragon Fruit (Hylocereus undatus), Yellow Dragon Fruit (Selenicereus undatus), 2,6 diclorofenolindopheno

Penetapan Kadar Besi (Fe) Total Dalam Susu Formula Dengan Menggunakan Metode Atomic Absorbtion Spectrophotometry

Atomic absorption spectrophotometry can be used to determine iron in milk by wet ashing destruction method at wave length 248.3 nm. There research is aimed to know iron in formula milk it is based on the label and validation of the analytical method. According to validation is linearity test, precision test, accurate test, limit of detection and limit of quantitation. Linearity test showed with correlation (r) 0.998 (> 0.878 r table). Toll precision test with Standard Deviation (SD) 0.012%, Relative Standard Deviation (RSD) 1.835% and detection tool 98.165 %. The sample A of Accurate test with recovery 91.317% (standard 80 – 120 %) dan systematic error 8.683 %. Limited of detection according to the research is much 1.75 ppm, this valid method. At this iron research, it has been got different with the label. The compare result is smaller than label. Key words : iron, atomic absorption spectrophotometry, milk