ABSTRACT
Objective: To investigate the significance of each influencing factor and optimize the process of extracting indirubin from Isatidis Folium by Plackett-Burman design combined with central composite design-response surface methodology (CCD-RSM). Methods: Plackett-Burman experimental design was used to screen the main influencing factors, and CCD-RSM was used to optimize the extraction process of indirubin. With the concentration of ethanol, the ratio of material to liquid, and the extraction time as independent variables and the extraction amount of indirubin as dependent variable, the optimum extraction process of indirubin from Isatidis Folium was predicted and analyzed by multiple linear regression and binomial fitting models with independent and dependent variables and the three-dimensional surface graph. Results; The optimal extraction process of indirubin was as follows: ethanol concentration 62%, solvent/sample ratio of 26, and extraction time 9 min. Under these conditions, the maximal extraction rate of indirubin was 4.37 mg/g which was consistent with model predictions. Conclusion: The optimal process is simple and convenient for extracting indirubin from Isatidis Folium with high precision, reproducibility, and predictability.
ABSTRACT
Objective: To explore the bidirectional solid fermentation transformation of 25 different edible fungal strains with Isatidis Radix (IR) and Isatidis Folium (IF) to get the synergism antibacterial effect of fermentation substance. Methods: The dominant strains grown on IR and IF were obtained through initial screening and repeated screening. The antibacterial effect of fermentation product substance were determined by antibacterial test and TLC. Results: The results showed that repeated screening got three strains which could grow fast in IR (G-11, G-13, and G-7) and IF (G-2, G-11, and G-3). The G-3 strain and G-11 strain fermentation substance had better antibacterial effect than IR and IF respectively. The methanol extract of G-2 fermented IF substance appeared a new spot by TCL, it should be an additional component after fermentation. Conclusion: The bidirectional solid fermentation could improved antibacterial effect of IR and IF, and the new active ingredients can be produced.
ABSTRACT
Objective:To establish the quality standard for Isatidis folium dispensing granules. Methods:Indigo and indirubin in the granules were identified by TLC. The extract content was determined by a hot dipping method for the determination of alcohol-solu-ble extract. The content of indirubin was determined by HPLC. Results:The spots in TLC were clear and well-separated. The extrac-tion limit no less than 12. 0% was preliminarily drawn up. Indirubin showed a good linear relationship within the range of 0. 50-8. 04μg·ml-1(r=0. 999 9) with the average recovery of 99. 41%(RSD=1. 21%, n=9). The content limit no less than 50. 0 μg per pack was preliminarily drawn up for indirubin. Conclusion: The method is easy-operated and accurate with good specificity for the quality control of Isatidis folium dispensing granules.