Method for selective degradation of condensed tannin through hydroxyl radicals assisted by ultrasound and control on degree of degradation of condensed tannin
An ultrasonic-assisted and controlled technology, applied in chemical instruments and methods, preparation of sugar derivatives, esterified saccharides, etc., can solve the problems of inability to achieve selective degradation of condensed tannins and control of the degree of degradation, and avoid excessive Degradation, high oxidation efficiency, uniform dispersion effect
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Embodiment 1
[0043] The steps of the method for controlling the degree of degradation of condensed tannins of the present embodiment are as follows:
[0044] 1) Processing of raw materials rich in condensed tannins
[0045] 1-1) Take the black wattle bark that has been cleaned to remove impurities and air-dried to a moisture content of 12%, and crush it into 100-mesh plant powder with a plant grinder, and place the plant powder at 50%, 60%, and 70% in sequence, In 80% methanol aqueous solution, the mixing ratio of plant powder and methanol aqueous solution is 1:10;
[0046] 1-2) The soaking time is 2 hours each time, leaching once under the assistance of ultrasonic power 100W, the leaching temperature is controlled at 30°C, and the ultrasonic leaching time is 0.5h each time. Liquor, each extraction solution is combined, after the solvent is evaporated by a rotary evaporator, vacuum freeze-drying obtains black wattle bark tannin;
[0047] 2) Degradation and control of condensed tannins
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Embodiment 2
[0054] The present embodiment is basically the same as Example 1, except that the step 1-1) first prepares the acacia bark with a moisture content of 10% and pulverizes it to obtain 110 mesh plant powders, and the mixing ratio of the plant powder and methanol aqueous solution is 1 : 60; said 1-2) each time of wetting and swelling is 5h, and the ultrasonic conditions are: the ultrasonic power is 500W, the extraction temperature is controlled at 90°C, and the ultrasonic extraction time is 1.5h each time.
[0055] In said step 2), the acacia bark tannin is formulated into an aqueous solution of 20% concentration, placed in a quartz reactor with an ultrasonic generator and a temperature controller, the ultrasonic power is 2000W, and the quartz reactor is placed in a 2000W ultraviolet lamp Under irradiation, ozone (O 3 ), the inlet pressure is 0.5MPa, and the reaction temperature is controlled at 100°C to carry out the degradation reaction;
[0056] After 13 hours of reaction, the...
Embodiment 3
[0058] This embodiment is basically the same as Example 1, except that: in the step 1-1), first prepare larch bark with a moisture content of 8% and pulverize it to obtain 120 mesh plant powder, and the mixing ratio of plant powder and methanol aqueous solution is 1 : 20; in the above 1-2), each moistening time is 2.5h, and the ultrasonic conditions are: the ultrasonic power is 200W, the extraction temperature is controlled at 40°C, and each ultrasonic extraction time is 40min.
[0059] In said step 2), the larch bark tannin is formulated into an aqueous solution of 4% concentration, placed in a quartz reactor with an ultrasonic generator and a temperature controller, the ultrasonic power is 600W, and the quartz reactor is placed in a 700W ultraviolet lamp Under irradiation, continue to add the hydrogen peroxide (H 2 o 2 ), the concentration of hydrogen peroxide is 30%, added once every 1h, the reaction temperature is controlled at 30°C, and the hydroxyl radical degradation r...
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