Method for microwave-ultrasonic-assistant hydrolysis extraction of Caesalpinia spiosa pod gallic acid

Abstract

The invention relates to a method for microwave-ultrasonic-assistant hydrolysis extraction of Caesalpinia spiosa pod gallic acid. The method comprises adding deionized water into Caesalpinia spiosa pod powder as a raw material, carrying out reflux condensation, carrying out filtration to obtain a filtrate, adding an ion exchange resin catalyst and an antioxidation reagent into the filtrate and carrying out microwave-ultrasonic-assistant heating extraction to obtain gallic acid, wherein in heating, under the action of ionic liquid catalysis, tannic acid is decomposed to form gallic acid so that a gallic acid yield is effectively improved. The ion exchange resin is convenient for recovery, can be recycled, is economic and environmentally friendly, is suitable for large scale production and has high economic and practical value.

Description

Technical field: [0001] The invention belongs to the high-tech field, and in particular relates to a method for extracting gallic acid from tara fruit pods through hydrolysis aided by microwave ultrasound. Background technique: [0002] Tara (Caesalpiniaspiosa), also known as tara and blue sumac, belongs to the genus of hematoxylin, mainly distributed in Peru, Ecuador, Colombia and other countries in the northwest of South America. , fertile and well-lit places, it can grow up to 8-10m; there are 10 varieties; the root system is developed, the main root is obvious; hermaphroditism, self-pollination; the fruit pods are flat, reddish-brown when mature, generally 8-15cm long , 1.5-2.1cm wide, with 2-10 seeds inside; 1,000-grain weight of the seeds is 306.8g; the seed tree can bloom and bear fruit in 3a, the full fruit period is 10a, and each high-yielding tree can set pods 100-400kg. The natural and geographical conditions for the normal growth of Tara are that the altitude is...

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Problems solved by technology

[0007] Chinese patent CN1104627 "Method for preparing gallic acid by alkali hydrolysis of Beihua raw materials" and CN1057255 "Using tara powder to produce gallic acid" use alkali hydrolysis first and then acid neutralization, which increases the complexity of the operation

Direct enzymatic hydrolysis production is often limited due to slow solvent diffusion and reaction conditions. For example, in CN1083532 "Enzymatic Production of Gallic Acid", enzymatic hydrolysis with solvents has strict requirements on temperature, pH, and dissolved oxygen, which is difficult to control

Yang Shunkai et al. "Enzymatic Transformation of Gallic Tannic Acid to Produce Gallic Acid" also adopts the method of enzymatic hydrolysis in solution, the solvent diffusion is slow, and the enzymatic hydrolysis speed is restricted

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