GC Analysis of FAMEs in Cookies on SLB®-IL111 after SPE Fractionation using Discovery® Ag-Ion
Materials
analytical column
SPE tube or plate
CONDITIONS
sample preparation
SPE (Solid Phase Extraction)
sample/matrix
1 g of commercially purchased cookies was ground and subjected to acid digestion and alkali hydrolysis followed by methylation as described in AOCS Official Method Ce 1k-09
SPE tube/cartridge
Discovery Ag-Ion SPE tubes, 750 mg/6 mL (54225-U)
condition
4 mL of acetone; allow solvent to gravity drip completely through tube; discard eluant; 4 mL of hexane; allow solvent to gravity drip completely through tube; discard eluant
sample addition
1 mL of extract; discard any eluant that drips through tube
elution
(Fraction 1) 6 mL of hexane:acetone (96:4); collect eluant in a fresh container with slight vacuum; ((Fraction 2) 4 mL of hexane: acetone (90:10); collect eluant in a fresh container with slight vacuum; (Fraction 3) 4 mL of 100% acetone; collect eluant in a fresh container with slight vacuum)
eluate post-treatment
evaporate each fraction at room temperature using nitrogen; reconstitute each fraction to 1 mL of hexane
column
SLB-IL111, 100 m x 0.25 mm I.D., 0.20 μm (29647-U)
oven
168 °C
inj. temp.
250 °C
detector
FID, 250 °C
carrier gas
1 μL, 10:1 split
injection
1 μL, 10:1 split
liner
4 mm I.D., split type, single taper wool packed FocusLiner™ design
Description
Analysis Note
A sample of commercially purchased cookies was ground, and fatty acids were extracted, methylated, fractionated, and analyzed with GC-FID using the SLB-IL111. The nutritional label for the cookies included partially hydrogenated cottonseed and soybean oils as ingredients. Based on this information, the fatty acid profile obtained for this sample was as expected; with cottonseed oil accounting for the small amount of C14:0 FAME, and the soybean oil as the source of the small amount of C22:0 FAME detected. Both oils contributed to the higher levels of the C16:0, C18:0 and C18:1 FAMEs. Note the presence of the C18:1 trans isomers in fraction 1. These are the result of the partial hydrogenation of these oils.
Legal Information
Discovery is a registered trademark of Merck KGaA, Darmstadt, Germany
FocusLiner is a trademark of SGE Analytical Science Pty Ltd.
SLB is a registered trademark of Merck KGaA, Darmstadt, Germany