Table 3.

Content of caffeine identified by HPLC.

Sample	Concentration (mg/ml)
C1	0.689
C2	0.605
C3	0.701
C4	0.545
C5	0.434
C6	0.709
C7	0.828
C8	0.902
E1	0.508
E2	0.571
E3	0.620
E4	0.548
E5	0.605
E6	0.527