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Tannins in tropical woods

Journal Article:

Abstract

A preliminary study was made of the chemistry of pyrogallol- and catecholtannins, their general properties and methods of extraction and determination. Three methods of estimation - Lowenthal, powdered hide and spectrophotometry - were compared using two control solutions, four samples of wood and one of bark. Using the empirical powdered hide method, tannins of both types were estimated in wood and bark of various tropical species (some separately and some as a mixture), Moroccan oaks (Quercus suber and Q. ilex), and European oak 9Q. petraea). Further tests were made on the wood and bark of the two mangrove species, Rhizophora mangle and R. racemosa, by subjecting them to successive extraction with a range of solvents. None of the woods tested had as much as the 10% of tannins considered necessary in economic sources. The bark of the two mangroves, of Eucalyptus urophylla and of Prosopis africana had tannin contents over 10% and the latter two species had very favorable tannin/non-tannin ratios. All the tropical species, with the probable exception of E. urophylla, had only catecholtannins. Only the oaks and E. urophylla bark gave positive results when tested for gallotannins.
Authors:
Publication Date:
Jan 01, 1978
Product Type:
Journal Article
Reference Number:
EDB-83-049008
Resource Relation:
Journal Name: Bois For. Trop.; (France); Journal Volume: 182
Subject:
09 BIOMASS FUELS; TANNIC ACID; QUANTITATIVE CHEMICAL ANALYSIS; WOOD; CHEMICAL ANALYSIS; CARBOXYLIC ACIDS; EUCALYPTUSES; EXTRACTION; MESQUITE; OAKS; TREES; TROPICAL REGIONS; AROMATICS; HYDROXY COMPOUNDS; ORGANIC ACIDS; ORGANIC COMPOUNDS; PHENOLS; PLANTS; POLYPHENOLS; SEPARATION PROCESSES; 140504* - Solar Energy Conversion- Biomass Production & Conversion- (-1989)
OSTI ID:
6506351
Research Organizations:
CTFT, 456 av Belle-Gabrielle, 94130 Magent-Sur Marne, France
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Journal ID: CODEN: BFTRA
Submitting Site:
HEDB
Size:
Pages: 37-54
Announcement Date:

Journal Article:

Citation Formats

Doat, J. Tannins in tropical woods. France: N. p., 1978. Web.
Doat, J. Tannins in tropical woods. France.
Doat, J. 1978. "Tannins in tropical woods." France.
@misc{etde_6506351,
title = {Tannins in tropical woods}
author = {Doat, J}
abstractNote = {A preliminary study was made of the chemistry of pyrogallol- and catecholtannins, their general properties and methods of extraction and determination. Three methods of estimation - Lowenthal, powdered hide and spectrophotometry - were compared using two control solutions, four samples of wood and one of bark. Using the empirical powdered hide method, tannins of both types were estimated in wood and bark of various tropical species (some separately and some as a mixture), Moroccan oaks (Quercus suber and Q. ilex), and European oak 9Q. petraea). Further tests were made on the wood and bark of the two mangrove species, Rhizophora mangle and R. racemosa, by subjecting them to successive extraction with a range of solvents. None of the woods tested had as much as the 10% of tannins considered necessary in economic sources. The bark of the two mangroves, of Eucalyptus urophylla and of Prosopis africana had tannin contents over 10% and the latter two species had very favorable tannin/non-tannin ratios. All the tropical species, with the probable exception of E. urophylla, had only catecholtannins. Only the oaks and E. urophylla bark gave positive results when tested for gallotannins.}
journal = {Bois For. Trop.; (France)}
volume = {182}
journal type = {AC}
place = {France}
year = {1978}
month = {Jan}
}