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Sweet potato stem leaf polyphenol and preparation method thereof

A technology of sweet potato stems and leaves and sweet potatoes, applied in the field of sweet potato stems and leaves polyphenols and its preparation, can solve the problems of discarding and waste of resources, and achieve the effects of low production cost, strong antioxidant activity, and high commercial application development value

Active Publication Date: 2013-11-20
INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present in our country, except for a small part of sweet potato stems and leaves used as feed and fertilizer, most of them are discarded as agricultural waste products, resulting in a great waste of resources

Method used

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  • Sweet potato stem leaf polyphenol and preparation method thereof
  • Sweet potato stem leaf polyphenol and preparation method thereof
  • Sweet potato stem leaf polyphenol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, the influence of the pH value of polyphenol crude extract on the adsorption capacity of AB-8 macroporous adsorption resin

[0044] (1) Collection and pretreatment of raw materials: The sweet potato stems and leaves were picked in late July, and the picking part was the top 10cm of the vines. Wash and drain the fresh sweet potato stems and leaves, cut them into 1cm pieces, put them in a tray and pre-freeze them in a -40°C refrigerator for 24 hours, take them out and put them in a freeze dryer, dry them for 48 hours, and use a universal grinder Pulverize, cross 40 mesh sieves, make sweet potato stem and leaf dry powder, as following experimental raw material;

[0045] (2) Crude extraction of polyphenols: Weigh 0.5g of sweet potato stem and leaf dry powder in step (1), add 10mL of 70% ethanol solution according to the ratio of solid to liquid 1:20, mix well, and ultrasonically extract in an ultrasonic cleaning machine 30min, after extraction, centrifuge at 7...

Embodiment 2

[0056] Embodiment 2, the influence of polyphenol crude extraction total phenol concentration on the adsorption capacity of AB-8 macroporous adsorption resin

[0057] According to the steps (1) and (2) in Example 1, adjust the total phenol concentration of each solution to 0.02, 0.50, 1.00, 1.50, 2.00 and 2.50 mg CGA / mL with distilled water, and fix the pH value of each solution to 3, Adsorption was carried out according to the method of step (3) of Example 1, and the influence of different total phenol concentrations in the crude extract on the adsorption capacity of the resin was investigated.

[0058] The result is as image 3 As shown in Table 2, it can be seen that when the total phenol concentration of the crude polyphenol extract is lower than 2.00mg CGA / mL, the resin adsorption capacity increases with the increase of the sample concentration, and the resin reaches the maximum adsorption when the sample concentration is 2.00mg CGA / mL The amount of CGA / g was 27.38mg CGA / ...

Embodiment 3

[0061] Embodiment 3, the influence of ethanol desorption liquid mass concentration on the desorption rate of AB-8 macroporous adsorption resin

[0062] According to the steps (1) and (2) in Example 1, the crude extract of sweet potato stem and leaf polyphenols was prepared, and the pH value of the solution was adjusted to 3.0, and the total phenol concentration was 2.00 mg / mL for later use. Adsorb according to the method of step (3) of Example 1. After the adsorption is saturated, wash away impurities with an appropriate amount of distilled water, add 50 mL of ethanol desorption solution with a concentration of 30, 50, 70, 90, and 100% respectively, and place in a constant temperature oscillator. Desorb each resin by shaking at 25°C and 130r / min for 24 hours, measure the total phenol concentration in the desorption solution, and calculate the desorption rate according to the following formula. The influence of different concentrations of ethanol desorption solution on the deso...

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Abstract

The invention discloses sweet potato stem leaf polyphenol and a preparation method thereof. The method comprises the following steps: (1) picking fresh sweet potato stem leaves, and washing, drying and crushing the fresh sweet potato stem leaves sequentially to obtain sweet potato stem leaf dry powder; (2) performing ultrasonic extraction on the sweet potato stem leaf dry powder by using an ethanol aqueous solution a, collecting supernate by centrifuging, and removing ethanol to obtain crude extracting liquid of sweet potato stem leaf polyphenol; and (3) adjusting the total phenol concentration and the pH value of the crude extracting liquid of the sweet potato stem leaf polyphenol, pumping into macroporous adsorption resin, washing the macroporous adsorption resin with water after adsorbing, desorbing the macroporous adsorption resin by using an ethanol aqueous solution b, collecting desorption liquid and removing ethanol to obtain the sweet potato stem leaf polyphenol. The sweet potato stem leaf polyphenol and the preparation method thereof have the advantages that reagents, materials, instruments and equipment used in the method are of common specifications, so the method is low in production cost, non-toxic and environment-friendly; and according to the sweet potato stem leaf polyphenol prepared by the method, the polyphenol purity is above 80%, the yield is 2 to 3%, the antioxidant activity of the sweet potato stem leaf polyphenol is strong, and a high commercial application and development value is achieved.

Description

technical field [0001] The invention relates to a sweet potato stem and leaf polyphenol and a preparation method thereof. Background technique [0002] Sweet potato (Ipomoea batatas) is an important cultivar of Convolvulaceae Ipomoea. It is native to South America. It is widely planted in my country because of its high and stable yield, drought resistance, barren resistance, strong adaptability and rich nutrition. , the yield is second only to rice, wheat and corn, accounting for more than 80% of the world's sweet potato production (about 100 million tons). It is an important grain, industry and feed raw material in my country. [0003] The stem and leaf resources of the aboveground part of sweet potato are abundant, and the annual output of sweet potato stem and leaf in my country is about 1.0×10 8 t. According to research reports by Hiroshi Ishida et al., sweet potato stems and leaves are not only rich in protein, fat, dietary fiber, minerals and other nutrients, but als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K36/8945A61P39/06A61P37/04A61P35/00A61K127/00A61K135/00
Inventor 木泰华席利莎孙红男张苗陈井旺
Owner INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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