Effect of spray drying on the polyphenolic compounds present in purple sweet potato roots: Identification of new cinnamoylquinic acids

The effect of spray drying on the different polyphenolic compounds present in root a purple-fleshed sweet potato variety Ipomoea batatas native from Peru was performed by HPLC-QTOF-MSMS. Nine anthocyanins, including four peonidin, three cyanidin and two pelargonidin derivatives glycosylated with sophorose and/or glucose acylated caffeic, ferulic p-hydroxybenzoic acid were identified. Twenty nine cinnamoylquinic acids (CiQA), eight mono-CiQA, fourteen di-CiQA, five tri-CiQA, identified base their MS fragmentation profile. Relevant amounts feruloylquinic Among them, some di tri-CiQAs containing feruloyl caffeoyl moieties structures, di-feruloylquinic reported here, for first time, Ipomoea. Spray process negatively affected phenolic groups, polyphenol losses representing around 90% initial amounts. Mono-CiQAs presenting mono peonidin less compounds.