The application of ultrasonic technology in the extraction of Chinese herbal medicines has been developed for several years, but the ultrasonic extraction process of various Chinese herbal medicines is not particularly clear. Here, the technical experts of Ronghui Ultrasonics listed the extraction process of various Chinese herbal medicines extracted, for reference only, the actual situation shall prevail.
1. Examples of extraction of flavonoids
(1) In the extraction of flavonoids from Ginkgo biloba, the extraction rate of conventional boiled for 4 hours was 56.5%; at room temperature, extraction for 10 min, the extraction rate was 82.6%, extraction was 30 min, the extraction rate was 88.3%; at 40 ° C, extraction by circulating ultrasonic extraction machine At 30 min, the extraction rate was 91.6%, which was higher than that of conventional ginkgo flavonoids extracted at 100 ° C for 6 hours.
(2) When the propolis flavonoids were extracted, the extraction was carried out for 48 hours, and the extraction rate was 36%; the ultrasonic extraction at room temperature for 30 minutes, the extraction rate was 41.8%.
(3) Ultrasonic extraction of Epimedium with 50% ethanol for 30 minutes at 30 °C, the extraction rate of flavonoids was 87%.
(4) When flavonoids were extracted, the total flavonoids yield was 11.5% after ultrasonic extraction for 60 min and 80% ethanol.
2. Examples of extraction of alkaloids
(1) When extracting betaine from Cistanche deserticola with water, ultrasonic extraction for 20 minutes is equivalent to the extraction rate of betaine by conventional leaching for 24 hours and 100 °C reflux for 6 hours.
(2) Using 1 citric acid as extractant to extract total alkaloids from sand oysters, ultrasonic extraction at room temperature for 30 minutes, extraction twice, extraction rate over 85%, three times better; 4-6 hours than normal temperature leaching / times, the effect of extracting three times is better, and the effect is higher than that of percolation for 24 hours;
3. Examples of ultrasonic extraction of mites
When extracting Cistanche tubulosa from Cistanche deserticola with methanol, ultrasonic extraction for 30 minutes is equivalent to conventional extraction for 24 hours and reflux at 80 °C for 5 hours.
4. Examples of ultrasonic extraction of polysaccharides
When extracting polysaccharides from Cistanche deserticola, the ultrasonic extraction time is higher than the conventional extraction for 24 hours and the 100 ° C reflux for 6 hours.
When extracting sulfated polysaccharide from kelp, ultrasonic extraction at 30 ° C for 20 minutes, the same sulfate ester polysaccharide extraction rate can be achieved by boiling (100 ° C) extraction for 5 hours.
5. Examples of ultrasonic extraction of tea polyphenols
Tea polyphenols and catechol were extracted from tea leaves, and the total amount of tea polyphenols and catechins was increased by 40% compared with 100 °C water extraction for 30 min at room temperature. The obtained polyphenols and catechol samples had no traits. The difference does not change the structure of the components of tea polyphenols and catechol.
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