Abstract
•Aningre tannin is mainly composed of catechin, gallogatechin as well as galloylated catechin and gallocatechin units.•It also presents flavonoids with the simultaneous combination of methoxy groups and linked glucose not observed before in bark and wood extracted tannins.•Cured resin can be formulated from aningre tannin.•Wood particleboard manufactured with aningre tannin resins have acceptable IB strength.
As aningre tree species are very abundant in central Africa, are rapid growing and have a very high percentage yield of tannin, aningre tannin extract was characterized using attenuated total reflectance Fourier transform (ATR-FT MIR) spectra in the 1800 and 600cm−1 range and Matrix Assisted Laser Desorption Ionisation Time of Flight (MALDI-TOF) mass spectrometry. These two characterization methods have proven that aningre tannin is a procyanindin/prodelphinidin composed of catechin, gallogatechin as well as galloylated catechin and gallocatechin units. Moreover, oligomers presenting the simultaneous combination of methoxy groups and linked glucose have been observed, these not having been observed before in bark and wood extracted tannins. Two resin formulations were developed with this extract. The Modulus of Elasticity (MOE) was studied by thermomechanical analysis and wood particleboards were prepared bonded with these resins.