Abstract:

Polyphenolic profiles in peel，pulp and core（without seeds）of two kinds of Pyrus bretschneideri Rehd.，one is Dangshan Suli and the other is Qiubaili，were respectively studied by UPLC– PDA–MS/MS–ESI. The results showed that forty-two kinds of phenolic component of the two kinds of Pyrus bretschneideri Rehd. were identified. Most kinds of the phenolic component contained in peel were more than those contained in pulp or core. But only 5-caffeoylquinic acid（chlorogenic acid）and Z-caffeoylquinic acid focused on the fruit core tissue. The peel tissue contained more types of phenolic compounds. In peel of Dangshan Suli，there were 42 kinds of phenolic substances belong to 5 groups. And in peel of Qiubaili，there were 30 kinds belong to 4 groups. Phenolics of flavanols，flavonols and flavones were not detected in the fruit core tissues or the pulp tissues. The peel’s phenolic compounds were further compared，the Dangshan Suli’s have 7 more kinds of flavones glycosides and 3 more kinds of quercetin glycosides than Qiubaili’s. The apigenin 7-O rutinoside was first identi?ed from Dangshan Suli peel by UPLC–PDA–MS/MS–ESI. No such kind of report was seen for other kinds of pear fruit tissues. B1，B2，C1，C-1，C-2 and C-3 were also identified tentatively from the Dangshan Suli and Qiubaili peel for the first time.

Key words: pear, phenolic compounds, Ultra Performance Liquid Chromatography–Photo–Diodearray–MS