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Method for extracting corn silk total flavonoids from corn silk and use of corn silk total flavonoids
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A technology for corn silk and total flavonoids is applied in the preparation technology and application field of total flavonoids, which can solve the problems of high cost and complicated process, and achieve the effects of increasing added value, simple equipment operation and improving extraction rate.
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Problems solved by technology
[0002] At present, using corn silk as raw material, the methods for preparing flavonoids are mainly leaching, macroporous resincolumn chromatography, ultrasonic extraction, etc., but the process is complicated and the cost is high.
Method used
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Embodiment 1
[0037] (1) Place 10Kg of corn silk in an oven and bake at 50°C for 8 hours, and pulverize it with an airflow ultrafine pulverizer to obtain superfine corn silk powder. The working pressure of the equipment is 0.7MPa, and the systemair volume is 3m 3 / min, classifier rotating speed 2400r / min, feeding speed 10kg / h, obtain corn silk superfine powder.
[0038] (2) Add ethanol 20 times the weight of corn silk to 500g corn silk superfine powder, wherein the mass fraction of ethanol is 30%, and extract with a flash extractor, the extraction pressure is 40V, and the extraction time is 6min.
[0039] (3) Centrifuge the extract obtained in step (2) at a speed of 5000r / min for 20min.
[0045] (2) The mass fraction of ethanol added to the corn silk is 10%, and the extraction is performed with a flash extractor, the extraction pressure is 20V, and the extraction time is 8 minutes.
[0046] (4) The flow rate of feed liquid is 10L / min.
[0047] (5) Separate the supernatant liquid obtained in step (4) with an ultrafiltration membrane with a molecular weight cut-off of 5000Da, the operating pressure is 0.1MPA, and the flow rate is 10L / min.
[0048] (6) Using rutin as a standard, the content of total flavonoids in corn silk total flavonoids extract was determined to be 35% by spectrophotometry.
Embodiment 3
[0049] Embodiment 3: with embodiment 1, the difference is,
[0051] (2) The mass fraction of ethanol added to the corn silk is 50%, and the extraction is performed with a flash extractor, the extraction pressure is 40V, and the extraction time is 2min.
[0052] (4) The flow rate of feed liquid is 15L / min.
[0053] (5) Separate the supernatant liquid obtained in step (4) with an ultrafiltration membrane with a molecular weight cut-off of 15,000 Da, the operating pressure is 0.2MPA, and the flow rate is 20L / min.
[0054] (6) Using rutin as a standard, the content of total flavonoids in corn silk total flavonoids extract was determined to be 40% by spectrophotometry.
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Abstract
The invention relates to a method for extracting corn stigma total flavone from corn stigma and an application of the corn stigma total flavone. The method comprises the following steps: baking corn stigma, crushing the corn stigma by using a air-flow type ultrafine crusher so as to obtain ultrafine powder, adding ethanol into the ultrafine corn stigma powder, extracting by using a flash extractor, separating the extract in a centrifugal separation mode, separating the supernate by using a ceramic micro-filtration membrane, removing macromolecule substances, separating the supernate by using a ultrafiltration membrane, freeze-drying the filtrate in vacuum, crushing so as to obtain a corn stigma total flavone extract which can be used for preparing antioxidants of meat foods, preservatives for frozen fresh meat or preservatives for grape. The method is high in extraction rate because of adoption of ultrafine crushing; due to adoption of the flash extraction device and membrane separation, the equipment is simple to operate, a small amount of organic solvents are used, the extraction time is short, and the production cost is low; the waste corn stigma is utilized, so that the additional value is increased; the extracted corn stigma total flavone has oxidation resistance and antibacterial activity, and can be used as food additive with the functions of oxidation prevention, freshness keeping and corrosion resistance for foods such as meat products and fruit.
Description
technical field [0001] The invention belongs to the field of preparation technology and application of total flavonoids, in particular to a method for extracting total flavonoids from corn silk and the application of total flavonoids from corn silk. Background technique [0002] At present, the methods for preparing flavonoids from corn silk as raw materials are mainly leaching, macroporous resincolumn chromatography, ultrasonic extraction, etc., but the process is complicated and the cost is high. If available, the raw material of corn silk is subjected to microwave treatment for the first, second and third times; the extract is treated and dried to obtain total flavonoids. Sieve corn silk, add ethanol to degrease, extract with water, concentrate, add hydrogenperoxide to decolorize, add ethanol for alcohol analysis, centrifuge, collect liquid phase to recover ethanol, perform chromatography, and dry to obtain corn silk flavonoids. Corn silk is degreased by adding ethanol...
Claims
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