GC Analysis of FAMEs in Popcorn Oil on SP®-2560 (75 m x 0.18 mm I.D., 0.14 μm) after SPE Fractionation using Discovery® Ag-Ion, Fast GC Analysis
CONDITIONS
sample preparation
SPE (Solid Phase Extraction)
sample/matrix
1 g of popcorn oil FAME′s in Hexane
SPE tube/cartridge
Discovery Ag-Ion, 750 mg/6 mL (54225-U)
condition
4 mL acetone and 4 mL hexane
sample addition
1 mL of the hexane FAME extract
elution
6 mL hexane:acetone (96:4, v/v) followed by 4 mL hexane:acetone (90:10, v/v)
column
SP-2560, 75 m x 0.18mm I.D., 0.14 μm (23348-U)
oven
180 °C isothermal
inj. temp.
220 °C
detector
FID, 220 °C
carrier gas
hydrogen, 40 cm/sec. at 180 °C
injection
(0.5 μL, 100:1 split)
liner
0.5 μL, 100:1 split
Opis
Uwaga dotycząca przygotowania
Sample pretreatment: A 1 g sample of popcorn oil was scraped from the inside of a popped microwave oven popcorn bag and mixed with 8 mL deionized water (DI) and 4 mL petroleum ether, centrifuged to remove particulates. The ether layer (upper layer) was collected. This petroleum ether extraction step was repeated four times. The upper ether layers were combined, evaporated, and reconstituted in 16 mL toluene. A 1 mL aliquot was transferred to conical reaction vial and 2 mL 7% boron triflluoride in methanol were added. The reaction was incubated at 80 °C for 15 minutes using a heating block, then cooled to room temperature. 1 mL DI water was added and FAMEs were extracted twice using 1 mL hexane each time. The upper hexane layers were combined into a fresh vial, evaporated, and reconstituted in 5 mL hexane and 50 mg anhydrous sodium sulfate.
Komentarz do analizy
Discovery Ag-Ion działa w oparciu o chromatografię argentacyjną, która jest potężną techniką analityczną i przygotowywania próbek do separacji lub frakcjonowania cis i trans geometrycznych i pozycyjnych kwasów tłuszczowych (FA), estrów metylowych kwasów tłuszczowych (FAME), diacylogliceroli (DAG) i izomerów triacylogliceroli (TAG). Discovery Ag-Ion SPE pokazano w tym zastosowaniu do oddzielania FAME z próbki oleju jadalnego.
Informacje prawne
Discovery is a registered trademark of Merck KGaA, Darmstadt, Germany
SP is a registered trademark of Sigma-Aldrich Co. LLC