Samples Amt. of ascorbic acid obtained in amla /mg in 100g Amt. of ascorbic acid obtained in lemon /mg in 100g Colorimetric Electrochemical Colorimetric Electrochemical 1 610.75 664.54 53.42 56.93 2 610.75 666.58 53.42 57.44 3 605.77 665.1 58.39 62.69 4 610.75 662.5 53.42 53.53 5 610.77 662.88 53.42 56.67

Table 4: Analysis of amount of ascorbic acid in lemon (Citrus Limon) and amla (Phyllanthus Emblica) samples using DPV on ZnO-RGO-GCE and colorimetry. (Note: NIN ICMR [63] Standard value of Vitamin C in amla has been reported to be around 600 mg/100 gm of edible portion, and in lemon it has been reported to be 53-64 mg/100 gm of edible portion)