Varieties Of P.betle Leaves Concentration(μg/ml) % Of Inhibition ± SD, n=3  Regression Equation
A 10 8.83 ± 1.322  y=13.42x-15.62
r2=0.602
50 12.87 ± 0.000
100 9.87 ± 1.027
250 18.57 ± 0.740
1000 73.11 ± 0.848
B 10 2.59 ± 0.385  y=10.83x-16.34,
r2=0.625
50 6.49 ± 0.555
100 6.23 ± 0.623
250 10.90 ± 0.286
1000 54.54 ± 1.210
C 10 8.31 ± 0.734  y=16.11x-20.53
r2=0.699
50 8.96 ± 1.314
100 16.10 ± 0.787
250 24.67 ± 1.438
1000 81.03 ± 0.634
D 10 4.54 ± 0.287  y=1.352x+2.824,
r2=0.972
50 5.32 ± 0.522
100 6.62 ± 1.510
250 7.92 ± 0.156
1000 10.00 ± 0.257
E 10 3.76 ± 0.244  y=4.89x-3.654,
r2=0.864
50 5.97 ± 0.124
100 7.40 ± 0.249
250 13.63 ± 0.216
1000 24.41 ± 0.616
F 10 9.48 ± 0.990  y=8.985x-8.569,
r2=0.560
50 8.44 ± 0.620
100 8.96 ± 1.070
250 12.85 ± 0.739
1000 52.20 ± 0.662
G 10 0  y=9.817x-16.44,
r2=0.778
50 2.46 ± 0.353
100 4.67 ± 0.317
250 15.19 ± 1.039
1000 42.72 ± 0.714
H 10 5.06 ± 0.283  y=3.519x-0.145,
r2=0.743
50 7.14 ± 0.388
100 8.96 ± 0.808
250 9.35 ± 0.560
1000 21.55 ± 0.670
I 10 4.93 ± 0.194  y=6.61x-4.978,
r2=0.823
50 7.53 ± 0.400
100 12.46 ± 0.389
250 15.19 ± 0.883
1000 34.15 ± 0.845
Table 1: DPPH Scavenging Activities of P.betle leaf.