Page 225 - Analytical method for food addtives

E310–12: Gallates 149

15 16 17

M perchloric acid and 0.1 mL MeOH added to aliquot and transferred to electrochemical cell and diluted to 10 mL with water. Stirred for 60 s after 2 s pause, a linear potential scan taken from 1–1300 mV at the glass carbon electrode (vs Ag–AgCl) with scan rate of 75 mV/s. The obtained linear sweep voltammograms (LSV) showed well

1.0 mL of 1.0 599 mV TLC

For vegetable oil samples: equal volume of MeOH added, shaken, centrifuged. MeOH extracts made to volume, 1.0 mL aliquot used. For solid samples: ground to powder, shaken with petroleum ether and extracted as for oil samples 100 mg/g BHA, BHT and PG added in fat Dissolve in petroleum ether and extract with aqueous ammonium ace

Hydrogenated vegetable fat

Foods Food

Voltammetric UV, TLC–UV, colorimetry, TLC– colorimetry Colorimetric PG = propyl gallate OG = octyl gallate DG = dodecyl gallate