The vitamin C content in the sample was
determined by spectrophotometric method as
described by AOAC (2005) and Rahman et al.,
(2007) using 2, 4-dinitrophenylhydrazine. 10 g of
the potato tubers was homogenized with 50 ml of
distilled water. 2 ml of each sample homogenate
was pipetted into test tubes; 38 ml of 0.5% oxalic
acid was added, mixed and incubated at 50o
C for
an hour