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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.

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 …