Wood Anatomical features and chemical composition of Prosopis kuntzei from the paraguayan chaco

Abstract

Anatomical features for Prosopis kuntzei Harms were studied by light and scanning electron microscopy. The wood is mainly diffuse-porous with indistinct growth ring boundaries. Vessel diameter ranges between 11 to 193 μm. The thick-walled fibres average 1275 μm in length. Parenchyma bands are 66 to 1066 μm apart. Heartwood extractives were studied in the vessels, rays and part of the fibres by means of scanning UV microspectrophotometry. The pyrolitic lignin content is 30.7%. The percentage of polyphenolic compounds, such as flavonoids, hydrolysable tannins and proanthocyanidins, is comparatively high at 5.8%. Total extract contents were determined after organic solvent extractions (23.2%) and water extractions (24.9%). The FTIR spectroscopy showed nearly identical spectra for the methanol and water extracts, with characteristic absorption bands for aromatic substances at 1615 and 1520 cm-1. The spectrum of the acetone extract differs only due to an additional but distinct absorption in the carbonyl range at 1695 cm-1. GC/MS analyses revealed that in the acetone and methanol extracts, tetrahydroxy-flavan-3-ols (isomers of catechin and epicatechin) were the main constituents with a ratio of 25.3 and 27.6%.

Surface characterization of wood treated with boron compounds combined with water repellents

“…The relationship of these peaks with polysaccharides has been reported in the literatüre. 33,45,57,[61][62][63] These peak values showed a decrease in the control samples after the weathering testing, a result which is compatible with the literature. Yildiz et al 64 in their study found that in parallel with the increase in the UV exposure time, these peaks decreased in coniferous wood species, while they increased in leafy wood species.…”

“…The C–H found in cellulose, cellulose, hemicelluloses and the CO and cellulose present in lignin express the C–O bonds in hemicelluloses. The relationship of these peaks with polysaccharides has been reported in the literatüre . These peak values showed a decrease in the control samples after the weathering testing, a result which is compatible with the literature.…”

Orientierende Untersuchungen zur Dauerhaftigkeit von Prosopis kuntzei Harms

“…Prosopis kuntzei Harms. P. kuntzei wurde bereits anatomisch, chemisch und technologisch untersucht (Giménez et al 1997;Scholz et al 2005Scholz et al , 2010 und gilt aufgrund seiner Inhaltsstoffe als dauerhaft (Tortorelli 1956;Dimitri et al 2000;Giménez und Moglia 2003;Scholz et al 2010). Nach Salvat et al (2004) weisen in Methanol gelöste Inhaltsstoffe der Rinde antibakterielle Wirksamkeit auf.…”

“…VorbetrachtungGérardin et al (2004) schreiben die Dauerhaftigkeit von P. africana neben bioziden Extraktstoffen auch hydropho-ben Gumen zu, da die zur Substratbesiedelung notwendige Feuchte fehlt. Das Vorkommen solcher Gumen kann auch für die untersuchte Holzart nicht ausgeschlossen werden(Scholz et al 2010). In diesem Zusammenhang empfehlenJunga und Militz (2005) u.a.…”

“…Allerdings handelt es sich vermutlich bei den Masseverlusten von P. kuntzei weniger um abgebaute Holzsubstanz, da ausgewaschene Inhaltsstoffe das die Prüfkörper umgebende Wasser färbten. In diesem Zusammenhang gebenScholz et al (2010) ca. 15,8 % gelöste Inhaltsstoffe im Kaltwasserextrakt für das Kernholz von P. kuntzei an.…”