Juan-xiu Liu

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OBJECTIVE To analyze the dynamic changes of nucleosides and nucleobases in Polygoni Multiflori Radix harvested in different periods. METHODS UPLC-QTRAP-MS/MS method was applied for the analysis of nine kinds of nucleosides and nucleobases in Polygoni Multiflori Radix. RESULTS The content of uridine, adenine, guanosine and cytidine was higher in Polygoni(More)
A comprehensive analytical method based on UPLC-MS/MS was developed for the simultaneous determination of thirteen components including three stilbenes (stilbeneglucoside, polydatin, resveratrol), four anthraquinones (emodin, physcion, emodin-8-β-D-glucopyranoside, aloe-emodin), five flavonoids (epicatechin, rutin, hyperoside, astragalin,quercetin) and one(More)
As the development of machine vision technology, the color line-scan system is widely applied in the on-line inspection. Due to the non-uniform gray scale and color distortion of the image acquired by the system, the image correction is needed to reduce the problem of image processing and the stability system. Based on reasons mentioned above, a method that(More)
To study the dynamic change law of bioactive constituents from Polygonum multiflorum, and to explore the optimal harvest period of P. multiflorum. Determination of stilhene glucoside, anthraquinones and catechin from P. multiflorum in different harvest times by MEKC-DAD, and principal component analysis (PCA) was used to comprehensive evaluation for(More)
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