FC was measured by a colorimetric assay developed by Zhishen,
Mengcheng, and Jianming (1999). Extracts crude of jackfruit,
papaya and araticum were diluted at a concentration of 20 mg/mL
in water distilled. 1.27 mL of diluted crude extract and 5 mL of
distilled water were homogenized and 0.3 mL 5% NaNO2 was
added. After 5 min, 0.3 mL 10% AlCl3 was added. After 6 min, 2 mL
1 M NaOH was added to the mixture.