Method for detecting alkaloids and nitrosamines in tobaccos simultaneously
A detection method and alkaloid technology, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as unsatisfactory detection results of Mesmin, unsystematic research on the composition and content of alkaloids and nitrosamines, etc. Sample preparation time, simplified pre-treatment process, quantitative and accurate effect
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Embodiment 1
[0050] ——Determination of alkaloid and nitrosamine content in flue-cured tobacco leaf samples and determination of conversion ratio of alkaloid to nitrosamine
[0051] Experimental materials: 10 groups of prepared flue-cured tobacco leaf samples.
[0052] experimental method:
[0053] Accurately weigh 100 mg of prepared flue-cured tobacco leaf powder passed through a 40-mesh sieve, transfer it into a 50 ml glass conical flask, add 1 ml of 1 μg / ml internal standard solution, and the internal standard solution contains D4-NNN, D4-NAT, D4-NAB and D4-NNK, then add 9ml to ultrapure water. Then, ultrasonically extract for 20min under the condition of 20Hz, pass the extract through a 0.22μm filter membrane, pipette 500μl into a 1.5ml centrifuge tube, add 1ml of methanol, vortex shake for 30s, and centrifuge at 9000r / min for 4min Finally, take 1ml of the supernatant and transfer it into a 1.5ml injection vial for liquid chromatography-tandem mass spectrometry analysis.
[0054] Th...
Embodiment 2
[0063] ——Determination of alkaloid and nitrosamine content in Burley tobacco leaf samples and determination of conversion ratio of alkaloid to nitrosamine
[0064] Experimental materials: 10 groups of Burley tobacco leaf samples.
[0065] experimental method:
[0066] Accurately weigh 90 mg of prepared flue-cured tobacco leaf powder passed through a 50-mesh sieve, transfer it into a 50 ml glass conical flask, add 0.9 ml of 1 μg / ml internal standard solution, and the internal standard solution contains D4-NNN, D4-NAT, and D4-NAB respectively and D4-NNK, then add 9.1ml to ultrapure water. Then, ultrasonically extract at 20Hz for 18min, pass the extract through a 0.22μm filter membrane, pipette 450μl into a 1.5ml centrifuge tube, add 0.9ml methanol, vortex shake for 25s, and centrifuge at a speed of 8000r / min After 5 minutes, take 1ml of the supernatant and transfer it into a 1.5ml injection vial for liquid chromatography-tandem mass spectrometry analysis.
[0067] The analys...
Embodiment 3
[0072] ——Determination of alkaloid and nitrosamine content in oriental tobacco leaf samples and determination of conversion ratio of alkaloid to nitrosamine
[0073] Experimental materials: 10 groups of oriental tobacco leaf samples.
[0074] experimental method:
[0075] Accurately weigh 110 mg of prepared flue-cured tobacco leaf powder that has passed through a 60-mesh sieve, transfer it into a 50 ml glass conical flask, add 1.1 ml of 1 μg / ml internal standard solution, and the internal standard solution contains D4-NNN, D4-NAT, and D4-NAB respectively and D4-NNK, then add 8.9ml to ultrapure water. Then, ultrasonically extract at 20Hz for 22min, pass the extract through a 0.22μm filter membrane, pipette 550μl into a 1.5ml centrifuge tube, add 1.1ml of methanol, vortex shake for 35s, and centrifuge at a speed of 10000r / min After 3 minutes, take 1ml of the supernatant and transfer it into a 1.5ml injection vial for liquid chromatography-tandem mass spectrometry analysis.
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