Iridoid glycoside extraction technology and anti-thrombotic activity of Osmanthus fragrans seeds / 中草药

ABSTRACT

Objective: To optimize the extraction technology of two major iridoid glucosides (specnuezhenide and nuezhenoside G13) from four kinds of Osmanthus fragrans (OF) seeds, and to evaluate the anti-thrombotic activity of OF seeds. Methods: The orthogonal-test experiment was employed to optimize the parameters including ethanol concentration, liquid-material ratio, and extraction time for three extraction methods (ultrasonic extraction, reflux extraction, and microwave extraction). The extraction yield, content, and total peak area of iridoid glucosides were selected for weighted analysis to determine the best extraction method and technology. Additionally, an anti-thrombotic zebra fish model was established for biological evaluation of OF seeds. Results: Microwave extraction was the best method for iridoid glucosides extraction with the optimal conditions of ethanol concentration 55%, material-liquid ratio 1∶10, and microwave time 15 min. HPLC analysis showed that there was no significant difference in chemical composition among the four kinds of OF seeds. In zebra fish biological screening model, OF seeds displayed a weak inhibitory effect on the growth of thrombus and exhibited a pericardial edema effect in high dose-treated group. Conclusion: In this paper, extraction technology of two iridoid glucosides from four different kinds of OF seeds and preliminary anti-thrombotic activity evaluation of OF seeds were investigated. These results can provide the reference for further development and utilization of the agricultural waste of OF seeds.