Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 40, Issue -, Pages 13-20Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2012.02.039
Keywords
Grape pomace; Tannin-based adhesives; MALDI-TOF spectrometry; Formaldehyde emission; Wood particleboard
Categories
Funding
- CPER Structuration du Pole de Competitivite Fibres Grand'Est (French Competitiveness Fibre Cluster) through regional (Region Lorraine)
- national (DRRT and FNADT)
- European (FEDER)
- Doctorate Fellowship Foundation of Nanjing Forestry University
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Condensed tannins were extracted from grape pomace using a water medium in presence of three different bases as catalyst (NaOH, Na2CO3 or NaHCO3) and were characterized by FT-IR and MALDI-TOF spectrometry. It was demonstrated that the tannin extracts contained oligomers up to 6 repeating flavonoid units, with dominant procyanidin with a minor amount of prodelphinidin units. The structure of grape pomace tannin extracted did not present noticeable discrepancy exception of the ratio of the opening pyran ring which was different as a function of the catalyst used. Two different formulations (nonfortified tannin adhesive and fortified with addition of 20% of polymeric 4,4'-diphenyl methane diisocyanate (pMDI)) were used to press one layer particle board. It has been proved that the extraction processes largely affect the adhesive properties of the extracts obtained from the same raw material. Especially the particleboards prepared from tannins extracted using Na2CO3 as catalyst and without pMDI, give a high internal bonding value (1B=0.45 MPa), which was good enough to pass relevant international standard specifications for interior grade panels. Formaldehyde emission of these panels is very low, well under the European Norm requirements (<= 6.5 mg/100 g panel). (C) 2012 Elsevier B.V. All rights reserved.
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