Analysis of commercial proanthocyanidins. Part 3: the chemical composition of wattle (Acacia mearnsii) bark extract.
Wattle (Acacia mearnsii) bark extract is an important renewable industrial source of natural polymers for leather tanning and adhesive manufacturing. The wattle bark proanthocyanidin oligomers have 5-deoxy extender units that render the interflavanyl bonds resistant to acid catalysed hydrolysis and their composition cannot be determined via conventional thiolysis. We combined established phyto- and synthetic chemistry perspectives with an electrospray mass spectrometry investigation to establish that the flavan-3-ol based oligomers consist of a starter unit which is either catechin or gallocatechin, angularly bonded to fisetinidol or predominantly robinetinidol extender units.
Department of Chemistry, University of the Free State, Nelson Mandela Avenue, Bloemfontein 9301, South Africa.
Pieter B
PB
Venter
Nadine D
ND
Senekal
Gabré
G
Kemp
Maryam
M
Amra-Jordaan
Pir
P
Khan
Susan L
SL
Bonnet
Jan H
JH
van der Westhuizen
D000045:Acacia / Q000737:chemistry*; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D044945:Proanthocyanidins / Q000032:analysis*; D013237:Stereoisomerism
D010936:Plant Extracts; D044945:Proanthocyanidins