Abstract
The aim of this study was to systematically evaluate the effect of the cultivation year on the quality of different ginseng tissues. Qualitative and quantitative analyses of ginsenosides were conducted using a UPLC-UV-MS method. Eight main ginsenosides in three tissues (leaf, rhizome and main root) and four parts (periderm, phloem, cambium and xylem) of ginseng aged from 1 to 13 years were determined using a UPLC-PDA method. Additionally, the antioxidant capacities of ginseng leaves were analyzed by the DPPH, ABTS and HRSA methods. It was found that the contents of ginsenosides increased with cultivation years, causing a sequential content change of ginsenosides in an organ-specific manner: leaf > rhizome > main root. The ratio between protopanaxatriol (PPT, Rg1, Re and RF) and protopanaxadiol (PPD, Rb1, Rb2, RC and Rd) in the main root remained stable (about 1.0), while it increased in leaf from 1.37 to 3.14 and decreased in the rhizome from 0.99 to 0.72. The amount of ginsenosides accumulated in the periderm was 45.48 mg/g, which was more than twice as high compared with the other three parts. Furthermore, the antioxidant activities of ginseng leaves were measured as Trolox equivalents, showing that antioxidant activity increased along with time of cultivation. The results show that the best harvest time for shizhu ginseng is the fifth year of cultivation, and the root and rhizome could be used together within seven planting years for their similar PPT/PPD level. Besides, the quality of the ginseng products would be enhanced with the periderm. The ginseng leaf is rich in ginsenosides and has potential application for its antioxidant capacity.
Highlights
IntroductionThe root and rhizome of Panax ginseng C
Ginseng, the root and rhizome of Panax ginseng C
ultraperformance liquid chromatography (UPLC)-MS analysis was performed using a Waters ACQUITY UPLC system, and the markers and characteristic peaks were identified according to their fragment ions (m/z) and retention time
Summary
The root and rhizome of Panax ginseng C. According to the large amount of previous investigations on ginseng, the pharmacological activities of ginseng are mainly attributed to the presence of ginsenosides, including ginsenoside-Rb1, Rb2, Rc, Rd, Rg1, Re, Rf and Ro, which are considered the critical biomarkers for the ginseng quality evaluation [5,6,7]. As a major region for ginseng cultivation, China has approved a national project that in 2012 implemented ginseng cultivated for less than 5 years as a new food resource [8], which will further promote ginseng consumption and cultivation and make ginseng a table food for the broader population. In order to solve the current shortages of ginseng supply for commercial and scientific applications, scientific cultivation and effective usage of ginseng materials have attracted special attention for increasing the yield of ginseng
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