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Profiling of anthocyanins in transgenic purple‐fleshed sweet potatoes by HPLC‐MS / MS
Author(s) -
Ge Jingqiu,
Hu Yijie,
Wang Hongxia,
Huang Yuanshe,
Zhang Peng,
Liao Zhihua,
Chen Min
Publication year - 2017
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8379
Subject(s) - pelargonidin , anthocyanin , chemistry , cyanidin , abts , dpph , antioxidant , oxygen radical absorbance capacity , peonidin , food science , biochemistry , lipid peroxidation , transgene , gene , delphinidin
Abstract BACKGROUND Anthocyanins in purple‐fleshed sweet potato ( PSP ) are beneficial to human health. The leaf color ( Lc ) gene is a transcription factor involved in regulating anthocyanin biosynthesis. The anthocyanin profiles of wild‐type PSP of Ayamurasaki and its three Lc ‐transgenic lines were investigated by high‐performance liquid chromatography–tandem mass spectrometry ( HPLC‐MS / MS ). In vitro antioxidant activities of wild‐type and Lc ‐transgenic lines, including reducing power activity, DPPH radical scavenging activity, hydroxyl radical scavenging activity, linoleic acid autoxidation inhibition activity, ABTS free radical scavenging activity and oxygen radical absorbance capacity activity, were measured. RESULTS The results showed that the total anthocyanin contents increased 1.5–1.9 times in three transgenic lines compared with that in wild‐type PSP . Seventeen anthocyanins were found in wild‐type PSP , while 19 in Lc‐ transgenic lines including cyanidin‐based, peonidin‐based and pelargonidin‐based anthocyanins. Three pelargonidin‐based anthocyanins were detected in three Lc ‐transgenic lines. Among them, the relative contents of cyanidin‐based and pelargonidin‐based anthocyanins increased 1.9–2.0 and 3.4–4.5 times respectively, while peonidin‐based anthocyanins decreased 1.8–1.9 times in Lc ‐transgenic lines, compared with wild‐type PSP . PSP from wild‐type Ayamurasaki and three Lc‐ transgenic lines exhibited potent antioxidant activities, whereas there was no distinct difference among them. CONCLUSION The transgene Lc significantly increased the content of total anthocyanins and remarkably changed the anthocyanin profiles in Ayamurasaki. Such novel and high content of anthocyanins obtained in the Lc ‐transgenic lines with potent antioxidant activities may provide unique functional products with potential helpful for human health. © 2017 Society of Chemical Industry