Effects of three treatments on vitamin C content in different parts of jujube

ABSTRACT: Objective To observe the effects of different treatments on the content of vitamin C in different parts of jujube. Methods Red jujube was dried by electrothermal constant temperature drying method, microwave drying equipment, electrothermal constant temperature drying method and microwave drying method. Vitamin C levels in different parts of red jujube were determined by iron () - phenanthroline - BPR spectrophotometry.

microwave drying equipment

Results The vitamin C level in pericarp was significantly higher than that in pulp (P < 0.065). The vitamin C level of peel was significantly decreased by electrothermal constant temperature drying or by drying (P < 0.05, and microwave drying destroyed more vitamin C, while electrothermal constant temperature drying plus microwave drying destroyed less vitamin C. ConclusionMicrowave electrothermal constant temperature drying plus microwave drying can drying red matter more efficiently and has less damage to vitamin C, which is worth popularizing.

ujube microwave drying 

Effects of drying methods on color, polyphenols and antioxidant activity of Tartary Buckwheat malt

The effects of vacuum freeze drying, hot air drying, microwave drying equipment, natural shade drying and sun drying on the color of Tartary Buckwheat malt and the content, components and antioxidant activity of polyphenols in methanol extract were studied. The results showed that different drying methods had significant effects on the color, polyphenol content, composition and antioxidant activity of Tartary Buckwheat malt.

microwave drying equipment

The color change of Tartary Buckwheat malt was the smallest in vacuum freeze-drying and hot air drying at 60 C, while that of natural shade-drying was the worst. Tartary buckwheat malt contains a variety of polyphenols, the highest content of which is rutin, followed by quercetin and chlorogenic acid. Drying methods have significant effects on these components.

microwave drying of Tartary buckwheat 

Study on Dielectric Properties of Jiangnan New Year Cake Based on Microwave Drying

Absrtact: The effects of frequency (915-2450 MHz), moisture content (16-48%) and temperature (25-60 C) on dielectric constant and dielectric loss factor (E) of Jiangnan rice cake were measured and studied by network analyzer. The penetration depth of microwave drying equipment was calculated and the effects of frequency, moisture content and temperature on the annual cake were analyzed. The relationship model between electrical parameters and main influencing factors verifies the accuracy and feasibility of predicting water content based on dielectric parameters.

microwave drying equipment

The results show that in the frequency range of 915-2450 MHz, the e’‘of rice cake decreases with the increase of frequency, the e’’ increases with the increase of frequency, the e’'and e’’ both increase with the increase of water content, but decrease with the increase of temperature, and the energy penetration depth decreases with the increase of water content and frequency, and increases with the increase of temperature. The relationship between dielectric parameters and main influencing factors can be described by binary cubic equation, and the determinant coefficients of each model are greater than 0.99. This study has important guiding significance for understanding the dielectric properties of rice cake and the development of moisture content detector.

rice cake microwave drying 

Drying Conditions of Cordyceps militaris and Their Effects on Active Components

ABSTRACT: The drying and microwave drying conditions of Cordyceps militaris and their effects on the main active ingredients were studied. The results showed that the drying rate increased with the increase of drying temperature, and there were significant differences at all test temperatures. More than 75% of the moisture was lost in the first two hours. With the increase of microwave drying power, the drying rate also increased, and reached a very significant difference under each test microwave drying power. More than 75% of the moisture was lost in the first two hours. Lost in the first 6 minutes.

microwave drying equipment

For the content of active ingredients, 900W is the best in microwave drying equipment, which is significantly higher than other power. Cordycepin content is the highest at 60 C, while adenosine content is the highest at 70. In production, different drying conditions can be selected according to needs.

Key words: microwave drying of silkworm caterpillar fungus; drying; drying rate; active ingredients

Silkworm caterpillar fungus, which has similar active ingredients with Cordyceps sinensis, is a very valuable potential alternative to Cordyceps sinensis, and because of its ability to cultivate artificially, has formed a huge industry in China. The content of cordycepin and adenosine is an important index to evaluate the quality of Cordyceps militaris products. In addition, drying is an important link in the production of Cordyceps militaris, which directly affects the quality of products. It is of great significance to study the drying conditions of silkworm caterpillar fungus and their effects on the content of active ingredients for the further development of silkworm caterpillar fungus.

microwave drying of silkworm caterpillar fungus 

Application of Microwave Technology in the Production and Research of Traditional Chinese Medicine

Absrtact: Microwave drying equipment is widely used in the production and scientific research of traditional Chinese medicine. In the extraction of bioactive components, it has involved volatile oil, glycosides, polysaccharides, flavonoids and other natural compounds. In addition, microwave has been introduced to drying, sterilization, processing, Decoction and other aspects of traditional Chinese medicine. It has many advantages, such as fast speed, uniform effect, energy saving, less pollution, good Decoction effect, easy to realize automatic control and good product quality.

Microwave drying equipment

Key words: microwave drying of traditional Chinese medicine; application

Microwave has good penetration ability and selectivity. It can penetrate plastics, but it has reflectivity to metals and can not penetrate. It can be used as a shielding device. Microwave only selectively heats polar molecules, the stronger the polarity of molecules, the higher the selectivity.

microwave drying of traditional Chinese medicine 

Effects of drying methods on the content of functional components and antioxidant activity of Scutellaria baicalensis

ABSTRACT: OBJECTIVE: To investigate the suitable drying methods of Radix Scutellariae by taking the contents of total polysaccharides, total phenols, total flavonoids, VE with different configurations and antioxidant activity as indicators.

Microwave drying equipment

METHODS: The contents of total polysaccharides, total phenols, total flavonoids and antioxidant activities were determined by ultraviolet spectrophotometry, and the contents of VE in different configurations were determined by high performance liquid chromatography. The effects of six different drying methods (shade drying, sun drying, drying, vacuum freeze drying, infrared drying, microwave drying) on the quality of Euphorbia chinensis were evaluated comprehensively.

RESULTS: Microwave drying equipment could preserve the total polysaccharides, phenols and flavonoids to the greatest extent. Under vacuum freeze-drying conditions, the content of VE in different configurations was the highest and scavenged 1,1-diphenyl-2-trinitrophenylhydrazine (1,1-diphenyl-2-picrylhydrazyl, DPPH) free radicals, 2,2’-biazo (3-ethyl-benzothiazole-6-sulfonic acid) diammonium salt was free. (2,2’-azinobis-(3-ethylbenzthiazoline-6-sulphonate), ABTS + had the strongest ability; correlation analysis showed that the content of VE in different configurations was significantly correlated with antioxidant activity.

microwave drying of Scutellaria baicalensis 

Optimum selection of different drying methods for extract of Qiwei Shuanghua Chaihu Capsule

ABSTRACT: OBJECTIVE To optimize the drying process of Qiwei Shuanghua Chaihu capsule extract. Methods taking dry paste characteristics, yield, hygroscopicity and chlorogenic acid transfer rate as evaluation indexes, three drying methods, vacuum drying, microwave drying equipment and spray drying, were investigated.

microwave drying equipment

Results the transfer rates of chlorogenic acid in dry paste prepared by vacuum drying, microwave drying and spray drying were 82.5%, 89.6% and 92.3% respectively, and the dry paste quality was 17.66mg. G - 1.

19.89 mg.g-1 and 20.71 mg.g-1 respectively.

Conclusion spray drying time is the shortest, the appearance characteristics of the obtained materials are the best, and the transfer rate of the index components is the highest. It is the best drying method for the seven flavored double flower Bupleurum extract.

microwave drying of Chinese medicine