Monomer flavor mal-val for tobacco, preparation method and application thereof
A monomer and cigarette technology, applied in the field of flavors and fragrances and tobacco processing, can solve the problems of maintaining the moisture content of cut tobacco and improving the sensory comfort, etc. high rate effect
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Embodiment 1
[0026] A preparation method for tobacco monomer spice Mal-Va, which comprises the steps of:
[0027] Add 1 gram of maltose, 1.3 mL of dimethylformamide, and 3.3 mL of anhydrous methanol into a three-necked flask with a thermometer and a condenser tube, reflux at 73°C for 20 minutes, then add 0.130 gram of valine and reflux for another 20 minutes, and finally Add 0.035 g of strong acidic ion-exchange resin and 0.168 g of quercetin for reflux reaction for 1 h; after the reaction, separate and recrystallize through silica gel column chromatography to obtain 0.371 g of the target product in the form of white crystals. Among them, the eluent used for column chromatography separation is a mixed solution composed of n-butanol, glacial acetic acid and water, the volume ratio of the three is 4:1:1, and the chromogenic agent is ninhydrin ethanol solution; the solvent used for recrystallization It is a mixed solution of absolute ethanol and absolute methanol with a volume ratio of 1:1. ...
Embodiment 2
[0029] A preparation method for tobacco monomer spice Mal-Va, which comprises the steps of:
[0030] Add 1 gram of maltose, 3.2 mL of dimethylformamide, and 2.0 mL of anhydrous methanol into a three-necked flask with a thermometer and a condenser tube, reflux at 81°C for 28 minutes, then add 0.286 grams of valine and reflux for another 28 minutes, and finally 0.05 g of strong acidic ion exchange resin and 0.662 g of quercetin were added for reflux reaction for 4 h; after the reaction, 0.848 g of the target product in the form of white crystals was obtained by silica gel column chromatography and recrystallization. Wherein, the operation process of column chromatography separation and recrystallization is the same as that of Example 1.
Embodiment 3
[0032] A preparation method for tobacco monomer spice Mal-Va, which comprises the steps of:
[0033] Add 1 gram of maltose, 3.6 mL of propylene glycol and 1.8 mL of anhydrous methanol into a three-necked flask with a thermometer and a condenser tube, reflux at 88°C for 40 minutes, then add 0.325 grams of valine and reflux for another 40 minutes, and finally add 0.067 grams of strong Acidic ion exchange resin and 0.838 g of quercetin were refluxed for 7 hours; after the reaction, separated by silica gel column chromatography and recrystallized to obtain 0.597 g of the target product in the form of white crystals. Wherein, the operation process of column chromatography separation and recrystallization is the same as that of Example 1.
[0034] (1) Structural characterization of the target product
[0035] Through infrared spectroscopy (IR), high-resolution mass spectrometry (HR-MS), carbon nuclear magnetic resonance spectroscopy ( 13 C-NMR) carried out structural characterizat...
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