Objective: To study the correlation between chemical component content and grades of Cistanche deserticola,and then to determine the optimum steaming time of different grades of Cistanche deserticola.
Methods: Morphological indexes of postharvest stems of Cistanche deserticola were analyzed by principal component analysis and K-mean cluster analysis to determine a grading standard. Concentrations of phenylethanoid glycosides,polysaccharides,dilute ethanol-soluble extracts and total ashes in dried stems of Cistanche deserticola were determined using high performance liquid chromatography and ultraviolet spectrophotometer.
Results: There was no significant relationship between grades and chemical component content. The effect of steaming time was stronger than that of grades on chemical component content. Moreover, the optimum steaming time of grade Ⅰwas 30 min,of grade Ⅱ and Ⅲ were both 20 min.
Conclusion: It is suggested that postharvest Cistanche deserticola should be divided into three grades and steamed for a certain time.
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