100 mg/mL were added separately with distilled water to
prepare a serial dilution. Each dilution was mixed with
0.1 mL 0.1% 2-pentanol for methanol quantification and
1 mL 5% acetonitrile for ethanol quantification, and
then subjected to GC analysis. Limit of quantification
(LOQ) was determined when coefficient of variation of
recovery was higher than 15%.