Several types of extraction solvent; 100%
methanol, 100% acetonitrile, methanol: water
(60:40, (v/v)), acetonitrile: 20 mM sodium
acetate (50:50, (v/v)) and 1.0 N NaOH were
investigated. A blank noodle sample was
spiked with a standard mixture solution
containing 50 μg/mL of benzoic acid
and 10 μg/mL of sorbic acid, mixed and
prepared as previous above. The recovery
and standard deviation were calculated and
compared. The average recovery rate for
benzoic acid ranged from 66-78% using
100% methanol, 100% acetonitrile, acetonitrile:
20 mM sodium acetate (50:50, (v/v)) and
1.0 N NaOH while for sorbic acid ranged
from 89-105%. The mixture of methanol and
water (60:40, v/v) was found to be the most
suitable extracting solvent in this study with
the average recovery between 96% and 103%.
The result achieved indicated that there were
no matrix effects on benzoic acid and sorbic
acid determination.