Extraction of Total Flavonoids From Hypericum Perforatum Based on Uniform Design Method
Objective:To optimize the extraction technology of the total flavonoids from Hypericum perforatum.Methods:Selecting the contents of total flavonoids from the extractsolution as the target,the conditions of extraction were optimized by the uniform design method.Results:The optimum extraction technology was as follows:solid-liquid ratio 1∶10,90% ethanol,refluxing and extracting for 60 min,2 times.The total flavonoids in Hypericum perforatum was 9.12%.Conclusion:This optimized process is simple,stable and efficient.
The article discusses the results of a study published in the June 2012 issue of periodical "Current Biology" by biologist Harry Klee and colleagues about how fragrant compounds contribute to flavor in tomatoes. Topics include distinctions between ordinary supermarket tomatoes and heirloom varieties, how the volatile compound geranial enhances tomato flavor, and the results of a taste-test experiment.