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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11302

Title: Tannin extraction from the barks of three tropical hardwoods for the production of adhesives
Authors: Antwi-Boasiako, C.
Animapauh, S.O.
Keywords: Bark extract
Iron (III) chloride
phenol formaldehyde
qualitative test
Stiasny number
Issue Date: 2012
Publisher: Journal of Applied Sciences Research
Citation: Journal of Applied Sciences Research, 8(6): 2959-2965
Abstract: The use of tannins (i.e., polyphenols) from plant parts in phenol formaldehyde adhesives is less expensive but effective regarding bonding against cyclic moistening and re-drying. Plant barks contain more tannin than any plant part. Tannins were therefore extracted from the barks of three hardwoods of frequent forest availability (i.e., Alstoniaboonei, Funtumiaelastica andTetrapleuratetraptera) using Soxhlet extractorwith two solvents. Results indicate the presence of tannin at the bark extracts of each plant with water being more efficient for the extraction of tannins than 1%NaOH. Aquantitativediagnostic tool for determination of tannin content (Stiasny number) gave 88.49% for T. tetraptera as the highest and 74.61% as the least from F. elastica bark from distilled water extraction. The highest tannin concentration, using 1% NaOH, was 37.46% for T. tetraptera and the lowest (11.46%) for A. boonei. Thus, non-utilized bark residues from these tropical hardwoods, especially T. Tetraptera, could be exploited commercially for affordable tannin-adhesive production for accessible value-added wood laminates.
Description: Article published in the Journal of Applied Sciences Research, 2012
URI: http://hdl.handle.net/123456789/11302
ISSN: 1819-544X
Appears in Collections:College of Agric and Natural Resources

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