Analysis of Condensed Tannins from Mangosteen Pericarps by Matrix-assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry
In the process of deionization and selection Cs + (CsCl,1.52 g/L) as cationization reagent,the reflectron modes MALDI-TOF spectrum of condensed tannins from mangosteen (Garcinia mangostana L.) pericarps showed an intact structure characteristics.The polymers of mangosteen condensed tannins extend from the trimer (m/z 999 ) to the undecamer (m/z 3303 ) ,with the highest intensity in pentamer (m/z 1575) .(epi) Catechin (C/EC) ,(epi) gallocatechin (GC/EGC) and (epi) afzelechin (AC/EAC) were all detected in polymers with an intensity of C/EC AC/EAC GC/EGC.Meanwhile,galloyl units occurred from tetramer (m/z 1440) to heptamer (m/z 2303) .The presence of A-type interflavan ether linkage ranged from tetramer (m/z 1285) to octamer (m/z 2436) .