Subcritical water extraction agent and extraction method for polyphenols in lotus solid waste
A solid waste and subcritical water technology, applied in solid solvent extraction, organic chemistry, etc., can solve problems such as patents that have not been reported, and achieve the effect of simple extraction process, high extraction yield and low viscosity
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Embodiment 1
[0026] The composition and ratio of the extractant in parts by weight are: citric acid 1; Vc 0.1; sodium bisulfite 0.05, domestic water to 100%.
[0027] Take the processed fresh lotus root skin of the lotus root, clean it, filter water, without crushing, directly take 500kg of material and add it to the extraction kettle immediately, pump 500kg of the above-mentioned extraction agent, fill it with nitrogen for 15min, seal it, control the pressure of the extraction kettle at 8MPa, After the extraction temperature was 180° C., the extraction time was 10 minutes, cooled to 30° C., centrifuged at 3000 r / min, and the supernatant was collected. Pump the supernatant into the AB-8 macroporous adsorption resin column at a flow rate of 20kg / min. After equilibrating for 30min, wash with distilled water to remove unadsorbed impurities, then elute the resin column with 70% ethanol aqueous solution, and collect The eluate was recovered from ethanol under reduced pressure at 40°C to obtain ...
Embodiment 2
[0029] The composition and ratio of the extractant in parts by weight are: malic acid 1; Vc 1; sodium bisulfite 0.04; domestic water supplemented to 100%.
[0030] Take the processed fresh lotus root joints, clean them, filter water, primary crush, directly take out 500kg of material and add it to the extraction kettle immediately, pump 1000kg of the above extraction agent, fill it with nitrogen for 15min, seal it, control the pressure of the extraction kettle at 10MPa, and put it into the extraction kettle. After extracting for 20 minutes at a temperature of 160°C, cool to 30°C, centrifuge at 3000r / min, and collect the supernatant. Pump the supernatant into the AB-8 macroporous adsorption resin column at a flow rate of 20kg / min. After equilibrating for 30min, wash with distilled water to remove unadsorbed impurities, then elute the resin column with 70% ethanol aqueous solution, and collect Eluate, ethanol is recovered under reduced pressure at 40°C to obtain a concentrated s...
Embodiment 3
[0032] The composition and ratio of the extractant in parts by weight are: citric acid 0.5, malic acid 0.5; Vc 0.4; sodium bisulfite 0.4, domestic water to 100%.
[0033]Take the freshly deseeded lotus pod, clean it, filter water, roughly cut it, take 500kg of material and add it to the extraction kettle immediately, pump 800kg of the above extraction agent, fill it with nitrogen for 15 minutes, seal it, control the pressure of the extraction kettle at 5MPa, and extract it at the extraction temperature After the extraction time is 10min at 180°C, cool to 30°C, enrich / separate and dry according to the method of Example 1 to obtain 12.5kg of lotus pod polyphenols with a polyphenol content of 90.1%, including 10kg of proanthocyanidins and a content of proanthocyanidins was 93.6%.
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