Method for detecting secondary metabolites in fresh tobacco leaves by using derivatization GC-MS
A secondary metabolite, GC-MS technology, applied in the field of derivatized GC-MS for detecting secondary metabolites in fresh tobacco leaves
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Embodiment 1
[0030] Collect 6 pieces of fresh tobacco leaves from long-term tobacco plants in the laboratory (Honghua Dajinyuan variety), quickly remove the trunk and wrap them in tin foil, and freeze them with liquid nitrogen. Take out the tinfoil bag from the liquid nitrogen, pat it into pieces, and immediately freeze it in a freeze dryer for 24 hours to remove the water, and grind it to 40-60 mesh. Weigh 10mg smoke powder into a 1.5ml centrifuge tube, add 200μl deuterated hexadecanoic acid internal standard solution, 1.0ml 5:2:2 methanol-water-chloroform solution, ultrasonically extract for 30min, centrifuge at 10000r / min for 10min, Take 200 μl of the supernatant in another 1.5ml centrifuge tube, and dry it with a nitrogen blower at 40°C. Add 30 μl of methoxyamine hydrochloride solution (in pyridine) with a concentration of 20 mg / ml, mediate and shake for 1 min, then keep in a 37°C water bath for 90 min, then add 30 μl of TFMSA, mediate and shake for 1 min, then place in a 37°C water ba...
Embodiment 2
[0040] Method investigation on the recovery rate: 3 mature tobacco leaves of variety nc297 in Zunyi, Guizhou were collected, the stems were quickly removed, wrapped in tinfoil, and quick-frozen in liquid nitrogen. The tinfoil package was taken out of the liquid nitrogen, embedded in dry ice, air-expressed to the laboratory, and placed in a -80°C refrigerator. Take out the tinfoil package from the refrigerator, pat it into pieces, immediately freeze it in a freeze dryer for 24 hours to remove the water, and grind it to 40-60 mesh. Weigh 20mg smoke powder into a 1.5ml centrifuge tube, add 200μl deuterated hexadecanoic acid internal standard solution, 1.0ml 5:2:2 methanol-water-chloroform solution, 100μl mixed standard solution (each standard is added Concentrations are 20μg / ml, 100μg / ml, 200μg / ml, see Table 2), ultrasonic extraction for 30min, centrifugation at 10000r / min for 10min, transfer 0.4ml supernatant to a 5ml centrifuge tube, and store at 40℃ Blow dry with a nitrogen b...
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