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Micro wave drying method for grape seed proanthocyanidin extract

A proanthocyanidin and microwave drying technology, which is applied in the direction of organic chemistry, can solve the problems of high energy consumption and production cost, unsuitability for large-scale industrial production, and affecting product yield and quality. The effect of low consumption

Inactive Publication Date: 2010-07-28
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The freeze-drying method can better maintain the antioxidant properties of proanthocyanidins, but the investment in freeze-drying equipment is large, the energy consumption and production cost are high, and it is not suitable for industrialized large-scale production
The spray drying method can produce rapidly and continuously, but there is a serious problem of wall sticking in the drying process, which affects the product yield and quality

Method used

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  • Micro wave drying method for grape seed proanthocyanidin extract

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] see figure 1 , the density is 1050kg / m 3 The proanthocyanidin extract was poured into four material boxes 2 of a vacuum microwave drying apparatus (KMZ-2000, Wenzhou Kangpai Pharmaceutical Machinery Co., Ltd.), and the sample loading capacity of each material box was about 160g. Close the door 1 to start vacuuming and make the four material boxes rotate at a constant speed. When the vacuum degree in the drying chamber is 0.02Mp, turn on the microwave. Red, porous, crispy dry extract, just scrape the dry extract from the material box. The moisture content of the dry extract is 3.74%, and the drying speed is 1.69kg / h.

Embodiment 2

[0015] see figure 1 , the density is 1150kg / m 3 Proanthocyanidin extract is poured into four material boxes 2 of the vacuum microwave drying instrument, and the sample loading capacity of each material box is 110g. Close the box door 1 to start vacuuming and make the four material boxes rotate at a uniform speed. When the vacuum degree in the drying chamber Turn on the microwave when it is 0.02Mp, the power of the microwave is 2000kW, the frequency of microwave emission is 2450MHz, and dry for 15 minutes to form a dark red, porous, crisp dry extract, which can be scraped off from the material box. The moisture content of the dry extract is 3.60%, and the drying speed is 1.04kg / h.

Embodiment 3

[0017] see figure 1 , the density is 1250kg / m 3 The proanthocyanidin extract is poured into four material boxes 2 of the vacuum microwave drying instrument, and the sample loading capacity of each material box is 70g. Close the box door 1 to start vacuuming and make the four material boxes rotate at a uniform speed. When the vacuum degree in the drying chamber Turn on the microwave when it is 0.02Mp, the power of microwave is 3000kW, the frequency of microwave emission is 2450MHz, and dry for 15 minutes to form a dark red, porous, crisp dry extract, which can be scraped off from the material box. The moisture content of the dry extract is 0.94%, and the drying speed is 0.56kg / h.

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Abstract

The invention provides a micro wave drying method for a grape seed proanthocyanidin extract, which comprises the following steps: putting the proanthocyanidin extract into a material box of a vacuum microwave drier, and closing a door of the box; and when the vacuum degree is less than or equal to 0.02MPa, opening microwaves at the power between 1,000 and 3,000kW and the frequency of 2,450MHz, and drying 10 to 25 minutes to obtain the dry extract which is porous and loose and contains the moisture content less than 5 percent. Under the condition of the microwaves, the microwave energy is utilized to quick dry the proanthocyanidin extract, the time is short and the temperature is low in the whole drying process, and the inoxidizability of the proanthocyanidin can be better maintained. The dry extract obtained by the method has the advantages of low moisture content, porosity and looseness, and good dissolubility. The method has the characteristic of low energy consumption for drying due to the utilization of the microwave energy, and is worthy of promotion in industrial production.

Description

technical field [0001] The invention relates to the field of natural extract drying, in particular to a microwave drying method of grape seed proanthocyanidin extract. technical background [0002] Proanthocyanidins are composed of (+)-catechin, (-)-epicatechin and (-)-epicatechin gallate through C 4 -C 8 key or c 4 -C 6 Polyphenols with different degrees of polymerization formed by bonds are widely found in plants such as grapes, blueberries, cherries, plums and pine bark, among which grape seeds are an important source for the preparation of proanthocyanidins. Proanthocyanidins (GPC) has a strong anti-oxidation effect, high absorption by the human body, can remove free radicals and active oxygen in the body, and prevent arteriosclerosis caused mainly by the oxidation of low-density lipoprotein (LDL) in human blood. It also has pharmacological effects such as anti-radiation, anti-microbial, promoting cell proliferation activity, and anti-mutation. [0003] At present, ...

Claims

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Application Information

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IPC IPC(8): C07D311/62
Inventor 栾连军陈娜吴永江刘雪松陈勇王龙虎
Owner ZHEJIANG UNIV
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