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  Indian J Med Microbiol
 

Figure 7: Linear caffeine calibration graphs for each standard concentrations (μg/mL) against the peak areas GA, Cf, C, EC, EGC, EGCG, and ECG to obtain the slope and intercept value

Figure 7: Linear caffeine calibration graphs for each standard concentrations (μg/mL) against the peak areas GA, Cf, C, EC, EGC, EGCG, and ECG to obtain the slope and intercept value