Caffeine, colour and water soluble extract of commercial tea samples packaged in Egyptian factories

ABSTRACT

26 tea samples that packaged in Egyptian factories were collected from Giza and Cairo governorates. A comparative analysis was determined for caffeine, color and water soluble extract. The comments of Food and Drug Administration [FDA] and National Food Consumption Survey [NFCS] were specially considered for comparing the caffeine content of the tested tea samples. The Egyptian standard for tea [559/1991] was also used for assuring the response analyses of the samples. However, the investigated tea samples could be ordered in 3 main groups. Group A from which the normal consumer could easily have 5 cups/day, while the heaviest one reached 11 cups/day. In case of groups [B] and [C] the corresponding values are 4 and 9 cups/day for the former group and from 3 to 7 cups/day for the latter one