Concentration of corncob in water (%, w/v)

Concentration of citric acid (μg/mL) (mean ± SD, n = 2)

6

56.6 ± 8.65

12

176.61 ± 40.24

18

327.3 ± 3.26

24

459.6 ± 2.17

30

137.3 ± 14.14

40

143.5 ± 19.57

60

142.7 ± 6.52