and shown in Table 1. On the other hand
for comparison with HPLC, which is powerful in quantifi-
cation the samples were analyzed and similar results were
obtained. The summarized results of HPLC are shown in
Table 2. The literature report also indicated by Farah,
Monteiro, Calado, Franca, and Trugo (2006) also indicated
that the highest caffeine content observed in Arabic
green coffee beans was 1.23 ± 0.06% and the lowest was
0.96 ± 0.01%. Moreover, it was also proposed by Illy
(2002) that the percentage of caffeine for Arabic coffees
was on the average less than 1.5%. Using derivative spectrophotometer
it was also reported by Alpdogan et al.
(2002) that the percentage of caffeine in coffee seeds was
1.36 ± 0.03%