Method for determining earthy smell substances in freshwater fish
A method of determination, a technology of earthy smell, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of unsatisfactory sensitivity and selectivity, unsatisfactory effect, complicated devices, etc., to avoid interference of impurities and easy simultaneous determination , the effect of high accuracy
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[0047] Example 1
[0048] The method of n-hexane extraction-solid phase extraction concentration-gas chromatography-mass spectrometry for the determination of earthy smell substances geosmin and 2-methylisobornol in freshwater fish, comprising the following steps:
[0049] Crucian carp, descaled, gutted, and skinned, take the muscle along the back, homogenize and mix well.
[0050] The first step, extraction: Weigh 5 g of minced crucian carp meat, add 15 mL of n-hexane, fully shake, ultrasonicate for 15 minutes, centrifuge at 4500 r / min for 8 minutes, take the supernatant into a 50-mL centrifuge tube; then add 10 mL of n-hexane to the fish, fully shake, ultrasonically Centrifuge at 4500r / min for 15min for 8min, take the supernatant and add it to a 50mL centrifuge tube.
[0051] The second step, purification: add 0.5g C18 powder, 0.5g graphitized carbon black, and 2g anhydrous magnesium sulfate to the centrifuge tube in the first step, shake for 7 minutes, and centrifuge at 25...
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