VI treatment of whole potatoes
was carried out in a 10% ascorbic acid solution. A mass ratio, of
the solution to potato, of 3% w/w was used to ensure adequate
immersion and minimise the dilution effect on the concentration
of VI solution. A vacuum
pressure of 9.33 kPa was applied to the system for 0–60 min,
and atmospheric pressure restoration for 3 h.Whole potatoes were
drained, rinsed with distilled water to remove the attached solution,
and gently blotted with tissue papers. Ascorbic acid contents
of impregnated and untreated potatoes were analysed
immediately.