Oxalate content was determined using the method of Nwinuka et al. (2005). The flour sample (1.0g)was extracted thrice by warming (40oC - 50oC)and stirring with a magnetic stirrer for 1 h with 20 ml of 0.3 N HCl.
The combined extracts was diluted to 100 ml with water and used for the total oxalate estimation.