Technique for extracting resveratrol and pigment from grape skin
A technology of resveratrol and grape skin, which is applied in chemical instruments and methods, preparation of organic compounds, azo dyes, etc., can solve the problems of large influence of extraction medium product components, high investment and operating costs, and extraction process consumption. Time and other issues, to achieve the effect of reducing extraction cost, low extraction cost, and short extraction time
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Embodiment 1
[0022] 1) Grape pomace drying: the grape pomace after recovering the wine liquid is naturally air-dried to remove the remaining moisture until the moisture content is about 3%.
[0023] 2) Pulverization: pulverize the air-dried grape skins to 80 meshes and set aside.
[0024] 3) Ultrasonic extraction of resveratrol: Weigh 2 g of crushed 80-mesh grape skin, add 14 ml of ethyl acetate with a volume fraction ≥ 99.5%, and place it in an ultrasonic extractor for extraction. The extraction temperature is 40° C., and the extraction time is 15 min. After the extraction, the extract is filtered to obtain the filtrate and the filter residue, the filtrate is concentrated and the solvent is recovered, and the filter residue is extracted again with the recovered solvent. The extraction temperature and time are the same as the first extraction. After the extraction, the extract is extracted. The filtrate and filter residue were obtained by filtration, the filtrate was concentrated and the s...
Embodiment 2-3
[0030] Extraction of resveratrol: On the basis of implementation case 1, change the process parameters such as extraction temperature (°C), extraction time (min), extraction times, solid-liquid ratio (g / ml), particle size, etc. The specific implementation parameters are as follows As shown in the table:
[0031]
[0032]
[0033] The purification parameters of resveratrol are: change the resin model, sample concentration, shaking temperature ℃, adsorption time, eluent volume fraction, elution time min, elution temperature ℃, as shown in the following table:
[0034]
[0035] In the above-mentioned Examples 2-3, the parameters for extracting the pigment from the filter residue after extracting resveratrol are: ethanol volume fraction, extraction temperature (°C), extraction time (min), extraction times, solid-liquid ratio (g / ml ), the specific implementation parameters are shown in the table below:
[0036] Example
Embodiment 4-7
[0038] Extraction of resveratrol: On the basis of the implementation of Case 2-3, other extraction conditions remain unchanged, only the extraction solvent is changed, and the specific implementation parameters are as follows:
[0039]
[0040]Pigment extraction: On the basis of the implementation of Case 2-3, other extraction conditions remain unchanged, and only the volume fraction of the extraction solvent is changed. The specific implementation parameters are as follows:
[0041]
[0042] The purification of the pigment in the above-mentioned Examples 2-7 is the same as in Example 1.
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