Study on the structure of mangrove polyflavonoid tannins with MALDI-TOF mass spectrometry

• Published in: Journal of applied polymer science Vol. 109; no. 2; pp. 963 - 967
• Main Authors: Oo, C.W, Pizzi, A, Pasch, H, Kassim, M.J
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15.07.2008; Wiley
• Subjects: Applied sciences; Exact sciences and technology; MALDI; mass spectrometry; Model compounds; Organic polymers; Physicochemistry of polymers; polyflavonoids; structural composition; structure; tannins; MALDI; Rhizophoraceae; Matrix assisted laser desorption ionization; Experimental study; polyflavonoids; structure; Polyphenol; Time of flight method; Dicotyledones; Angiospermae; Isolation; Spermatophyta; Chemical composition; tannins; Monomer; Mass spectrometry; Vegetal tannin; structural composition
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.28135

Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry is a suitable method for examining polyflavonoid tannin oligomers as it is capable to determine aspects of their oligomeric structure and characteristics, which are otherwise too difficult to determine by other techniques. It has been possible to determine by MALDI-TOF for Rhizophora apiculata mangrove polyflvonoid tannins that: (i) procyanidins oligomers formed by catechin/epicatechin, epigallocatechin, and epicatechin gallate monomers are present in great proportions; (ii) oligomers, up to nonamers, in which the repeating unit at 528-529 Da is a catechin gallate dimer that has lost both the gallic acid residues and an hydroxy group which are the predominant species; (iii) oligomers of the two types covalently linked to each other also occur.