A kind of extraction method of antioxidant in wheat bran
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An extraction method and antioxidant technology, applied in the agricultural field, can solve the problems of non-compliance with environmental protection requirements, too many solvents, high toxicity, etc., and achieve the effects of improving utilization value, mild extraction conditions and high extraction rate
Inactive Publication Date: 2016-05-11
SICHUAN AGRI UNIV
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[0004] CN101411733A discloses a method for extracting antioxidants from fresh pomegranate peels. After immersing pomegranate peels in a mixed solvent for 0.1-2 hours, then concentrating and drying under reduced pressure to obtain antioxidants fro
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[0019] Example 1
[0020] This embodiment provides a method for extracting antioxidants from wheat bran.
[0021] Select high-quality, clean wheat bran to crush, pass a 40-mesh sieve to obtain pre-treated wheat bran; soak 2g of the processed wheat bran in 20ml of acetone solvent with a mass fraction of 50%, inflate with nitrogen, avoid light, 80℃, 60min , The obtained extract is slowly heated to 35°C in a water bath under the condition of 0.09MPa by the vacuum rotary evaporation method, and the antioxidant is recovered and stored under nitrogen. The recovery rate is 6.12%.
[0022] According to the method of Example 1, using the extraction conditions in Table 1, the antioxidants in the bran were extracted.
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[0023] Experimental example
[0024] In this experimental example, the extracts under different extraction conditions were tested, and the specific results are shown in Table 1.
[0025] Among them, the detection methods of various indicators are as follows:
[0026] 1. Determination of total phenol content:
[0027] Take 0.1mL of the filtrate and add 0.5mL of Folin's reagent and 1.5mL of 20% sodium carbonate solution, and react for 2h in the dark at room temperature. The absorbance of the reaction solution at 765nm is measured. Using gallic acid as the standard sample, make a standard curve. The total phenol content is expressed as μg gallic acid / g sample.
[0028] 2. Determination of scavenging free radicals:
[0029] A. Determination of clearing DPPH
[0030] Add 2mL of the 0.1mmol / LDPPH solvent solution to the reaction tube, then add 2mL of the diluted filtrate, mix well, and after 40 minutes of reaction at room temperature in the dark, use 2mL of the diluted filtrate and 2mL of the...
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Abstract
The invention relates to an extraction method for antioxidants in wheat bran. The extraction method comprises the following steps: 1) crushing and screening the wheat bran; 2) soaking the screened bran into a solvent, filling nitrogen, shading, and soaking to obtain an extracting solution, wherein the solvent is the mixture of 50 mass percent of acetone, 80 percent of methanol or acetone, methanol and water; 3) recovering the antioxidants from the extracting liquid by utilizing a rotary evaporation method. According to the extracting method, the low-cost bran serves as an extracting raw material; suitable extracting solvent formula and proportion are selected; the total phenol content in the obtained extracting liquid is high; the free radial removing effect is remarkable; finally, the antioxidants in the bran is obtained to the maximum by utilizing the rotary evaporation method. The extraction method disclosed by the invention is simple and rapid, has short extracting time, mild extracting conditions, high antioxidant extraction rate, and high free radical removing capacity, provides possible for the development of new products, and also fulfills the aims of improving the utilization value of the bran and the economic benefits of factories.
Description
technical field [0001] The invention relates to an extraction method of antioxidants in wheat bran, which belongs to the field of agricultural technology. Background technique [0002] At present, the annual output of wheat in my country has exceeded 100 million tons, and the annual output of bran as a by-product of wheat processing has reached more than 20 million tons. Since bran is rich in dietary fiber, it is an essential nutrient element for the human body. It can increase the fiber content in food, improve constipation, and promote the excretion of fat and nitrogen. It has a preventive effect on common clinical fiber deficiency diseases. It is of great significance, has been paid more and more attention by people, and is widely used in food. However, existing studies have shown that the bran is divided into 6 layers, and the outer 5 layers contain more crude fiber, less nutrition, and are difficult to digest. Blindly taking too much of these crude fibers may overwhel...
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