What is the characteristic compound of Ampelopsis grossedentata (vine tea)?

Label:chem

Topic
Ampelopsin (dihydromyricetin) is the characteristic compound of vine tea. Previous literature suggested four possible stereoisomers, but the naturally occurring form is (2R,3R)-ampelopsin.
Answer
A study identified ampelopsin (dihydromyricetin) as peak 6 using standards-based UPLC-Q-Exactive Orbitrap MS. Identification was achieved by matching retention time (4.46 min), molecular ion peak ([M–H]⁻ at m/z 319.0457), MS/MS fragments (m/z 301.0346, 257.0448, 193.0134, 175.0027, 151.0056, 137.0223, 125.0233), and characteristic fragment patterns against an authentic standard.
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