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Method for preparing straw active phenolic acid

A technology of active phenolic acid and straw, which is applied to the preparation of carboxylate, chemical instruments and methods, and the preparation of organic compounds, etc.

Active Publication Date: 2015-03-04
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the preparation of phenolic acid active substances by transformation of straw

Method used

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  • Method for preparing straw active phenolic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 5 g of rice straw and add it to the ionic liquid [BMIM]Cl (20 g), wherein the ionic liquid is a solvent and a catalyst; heat it in an oil bath at a temperature of 170° C. for 0.3 h, and stir to dissolve the rice straw in Among the above-mentioned ionic liquids; solid substances such as the supernatant and the undissolved stalks in the lower layer are filtered, because the supernatant liquid is viscous, it is best to add water to dilute, and the solid substances are washed with water to obtain a washing liquid, and the diluted upper Cleansing and washing fluids. The supernatant and washing liquid were packed into a column with AB-8 macroporous adsorption resin and eluted with 40% ethanol solution, distilled under reduced pressure, and freeze-dried at -40°C to obtain active phenolic acid, and the total was determined by Folin Ciocalteu reagent colorimetry Phenolic acid content, using gallic acid as a standard, can determine the content of phenolic acid. By calculati...

Embodiment 2

[0020] The steps of the method are basically the same as those in the example, except that 2 g of wheat straw is added to the ionic liquid [BMIM]Ac (78 g), and it is assisted by ultrasonic heating with a power of 300 w and a treatment time of 20 min. Adsorbed with phenolic acid adsorption resin XAD 7HP, eluted with deionized water to obtain eluate, and the conversion rate of phenolic acid was measured by Folin method to be 30.15mg / g wheat straw.

[0021] According to research and analysis: the yield of phenolic acid in this example is high, which is mainly due to the fact that phenolic acid in wheat straw lignin is easily degraded under the implementation of the above method steps.

Embodiment 3

[0023] The steps of the method are basically the same as those in the example, except that 1 g of corn stalks is added to the ionic liquid [DMIM][DEP] (20 g), heated by microwaves, the microwave power is 800w, and the reaction time is 2 minutes. Adsorbed with phenolic acid adsorption resin XAD 7HP, eluted with deionized water to obtain eluate, and the conversion rate of phenolic acid was measured by Folin method as 28.12mg / g corn stalk.

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Abstract

The invention discloses a method for preparing straw active phenolic acid, which comprises the following steps: (1) mixing straw and an ionic liquid, heating, and stirring until the straw is dissolved in the ionic liquid; (2) filtering to obtain a supernate and an understratum solid matter, diluting the supernate with water, cleaning the understratum solid matter with water to obtain a cleaning solution, and merging the supernate and cleaning solution; and (3) adsorbing phenolic acid in the supernate and cleaning solution by using a resin, and carrying out reduced pressure distillation and freeze-drying to obtain the straw active phenolic acid. By using the ionic liquid as the treating agent and catalyst, the lignin components in the straw are converted into the phenolic acid active substance at high selectivity and high yield. Meanwhile, the used ionic liquid can be purified for cyclic utilization, and thus, is green and environment-friendly. The straw waste is mainly utilized to prepare the active phenolic acid, thereby changing wastes into valuable substances; and the method is a production method having application potential.

Description

technical field [0001] The invention belongs to the field of biochemical industry, and in particular relates to a method for preparing straw active phenolic acid. Background technique [0002] Phenolic compounds are a general term for a class of compounds with phenolic hydroxyl groups. Because they often have multiple phenolic hydroxyl groups, they are often called polyphenols. Phenolic compounds mainly include phenolic acids, flavonoids and other non-flavonoid phenolic substances. Studies have shown that some bioactive compounds with antioxidant activity are beneficial to human health. Among these biologically active compounds, phenolic derivatives have been identified. These compounds are found in many beverages, such as wine, tea, coffee, and more. Phenolic derivatives are compounds containing phenols, which is a large compound family of compounds. These compounds all have the potential for antioxidant activity due to the high reactivity of their hydroxyl substitution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C65/03C07C65/21C07C59/64C07C51/00
CPCC07C51/00C07C59/64C07C65/03C07C65/21
Inventor 李强屠洁王金正季更生李天程张大钊朱珣之万富
Owner JIANGSU UNIV OF SCI & TECH