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Figure 1: Antibacterial activity of ethanolic extracts of green tea and black tea

against four different bacterial strains
The measurements of the diameter of zone of inhibition are given in Table 1.

Sl. Concentrations Diameter(cm) Diameter (cm) Diameter (cm) Diameter (cm)

(%)
E. coli S. aureus K. pneumoniae P. aeruginosa
No.

Green Black Green tea lack tea Green tea lack tea Green Black
B
B
tea tea tea tea
1 0.2 1.05 1.1 0.9 1 0.95 1.1 1.15 1.4

2 0.3 1.1 1.1 1.05 1.1 1.1 1.1 1.6 1.65

3 0.4 1.15 1.2 1.25 1.15 1.2 1.15 1.7 1.8

4 0.5 1.3 1.25 1.45 1.3 1.35 1.4 2 2

Table 1: Values for zone of inhibition of Green tea and black tea against the

four bacterial strains.

These values are represented in the form of a graph as shown in Figures 2 and 3.

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