Organ‐ and Age‐Specific Differences of Dioscorea polystachya Compounds Measured by UPLC‐QTOF/MS,Chemistry & Biodiversity

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Organ‐ and Age‐Specific Differences of Dioscorea polystachya Compounds Measured by UPLC‐QTOF/MS
Chemistry & Biodiversity ( IF 2.3 ) Pub Date : 2021-01-07 , DOI: 10.1002/cbdv.202000856
Yan-Ge Yu _{1,

2} , Xiao-Yang Guo _{1,

2} , Xiang-Yang Li _{1,

2} , Dan-Dan Dai _{1,

2} , Xin-Ran Xu ₁ , Xiao-Jin Ge _{1,

2} , Yan-Jun Li _{1,

2} , Tie-Gang Yang _{1,

2}

Affiliation

Dioscorea polystachya, named Chinese yam, is widely cultivated as a functional food and natural medicine in China. There is currently few theses focus on the chemical characteristics of Dioscorea polystachya in different organs (tuber cortex and tuber flesh) and in various ages. In this study, a ultra high- performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (UPLC-QTOF/MS) was used to profile chemical compounds in Dioscorea polystachya. As a result, thirty-eight compounds were detected in yam tuber cortex and tuber flesh. More compounds were detected in yam tuber cortex than in tuber flesh. Compounds of dehydroepiandrosterone, allantoin and flavonoids were selected as biomarker candidates to show difference in abundance between tuber cortex and tuber flesh. Dehydroepiandrosterone was found more abundant in tuber flesh, while allantoin and flavonoids showed higher levels in tuber cortex. Furthermore, 12 compounds were selected to evaluate the differences in chemical compounds, of which only 7 compounds were identified: tryptophan, allantion, dioscin, sucrose, adenosine, glutamine and malvalic acid. The levels of of dioscin, malvalic acid and sucrose differed significantly among age groups and were highest in the tuber at 2 years. Meanwhile, the levels of allantion, adenosine and glutamine increased with the growing years and were highest at 4 years. Thus, two-year old Dioscorea polystachya tubers could be harvested to prepare dioscin, malvalic acid and sucrose supplements. And 4-year-old Dioscorea polystachya tubers would be the best choice for obtaining a large amount of allantion and adenosine in industrial production.

更新日期：2021-01-07

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