Page 224 - Analytical method for food addtives

reagent blank. Calculate amount of PG from standard curve
exactly 4 mL H 2 O and pipette 1 mL ferrous tartrate reagent
into flask. Mix well and measure A at 540 nm against
extract and transfer aliquot to
ammonium acetate solution.
For vegetable oil samples: 15 M perchloric acid and 0.1 mL MeOH added 1.0 mL of 1.0 to aliquot and transferred to electrochemical cell and equal volume of MeOH added, diluted to 10 mL with water. Stirred for 60 s after 2 s pause, shaken, centrifuged. MeOH a linear potential scan taken from 1–1300 mV at the glass extracts made t
Filter ammonium acetate
and extract with aqueous
conical flask

Hydrogenated vegetable fat

Foods Food

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