Page 269 - Analytical method for food addtives

4
5
6
Indirect UV absorbance
and direct conductivity
simultaneously
FID at 370 ºC
GC–MS
decyltrimethylammonium bromide
programmed 100–360 ºC. Carrier
BPX5 0.25 µm film. Temperature
min. Column:
Di(2-ethylhexyl)adipate (DEHA)
Adipic acid esters migrated into
mM 4-aminobenzoic acid,
mM tetra-
gas: helium. Cold on column
mM trihydroxymethyl-
(pH 7.0) with LiOH
aminomethane, 0.1
Retention time 8.6
n-heptane
injector
10.5
7.5
n-heptane. Other simulants not diluted
After drying the ether layer was
Olive oil simulant diluted with
Summary of methods for adipic acid in foods Reference Detection Method conditions Sample preparation Matrix 1 FID The adipic acid in the concentrate An alkaline solution of sample was Crackling was methylated using the extracted with ethyl ether. H 2 SO 4 was candy and diazomethane method added to water layer (pH<2). The soft
concentrated
simulants
wrapping
Wine
Food
Food
Table 14.1 (a) Method GC Capillary zone electrophoresis (CZE) GC GC–MS