Borbestimmung im Holz durch Extraktion mit Mannitol

Peylo, André

doi:10.1007/bf02663805

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…The leached boron concentration was determined by titration with NaOH in presence of D-mannitol according to the method of Peylo (1993). The leached waters were then analysed each day for their boron, tannin and protein contents.…”

Section: Wood Treatmentmentioning

confidence: 99%

Non-toxic albumin and soja protein borates as ground-contact wood preservatives

Thévenon

Pizzi²,

Haluk

1997

Holz als Roh- und Werkstoff

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Wood preservatives based on protein borates, both obtained by just mixed water solutions of protein and boric acid, as welt as in the case of premanufactured protein borates salts are shown to be a good method to greatly retard the leaching of boron from treated timber. Hence just premixed albumin + boric acid, premanufactured albumin borate and soja protein + boric acid all showed good preservative performance and much retarded leaching of boron. Accelerated biological tests indicated that boric acid partially fixed to timber by formation of a salt with albumin and other proteins which are then insolubilised by heat-induced coagulation can yield durability performances comparable to those obtained with CCA wood preservatives. The results of the biological tests show that protein borates, and particularly albumin borate, can be classified as long-term, wide-spectrum, ground-contact, heavy-duty wood preservatives, and are only composed of boric acid, a non-toxic to mammals biocide and of a non-toxic, natural, sometimes waste material, namely a protein. The mechanism is one of partially reversible rather than totally irreversible fixation of boron, leaving at all times small amounts of boron free to exercise its antifungal activity, but drastically diminishing its tendency to leach and greatly retarding its leaching. Boric acid leaching as a function of exposure time appears to tend to an equilibrium value. The timber is treated by just single stage, water-borne vacuum/pressure treating cycles as for traditional wood preservatives. Nicht-toxische Albumin-und Soja-Proteinborate als 5rf~r Holz mit Bodenkontakt Holzschutzmittel auf der Basis yon Proteinboraten wurden entweder einfach durch Verr/ihren der wgssrigen L6sunyen yon Protein und Bors/iure hergestellt oder als vorgefertigte Protein-Bors/iuresalze verwendet. Die Proteinsalze erwiesen sich als sehr wirkungsvoll gegen.das Auswaschen yon Bor(s/iure) aus behandeltem Holz. Bors/iuresalze mit Albumin und Sojaprotein zeigtem zudem gute Schutzwirkung gegen Pilzbefall. Die Bors/iure ist dabei teilweise fixiert durch Ausbilden yon Salzbindungen an die Proteine, welche ihrerseits durch W/irmebehandlung, d.h. Koagulation unl6slich gemacht werden. Diese salze erreichen im beschleunigten biologischen Test ~ihnliche Schutzwirkungen wie CCA-Holzschutzmittel. Die biologischen TestCorrespondence to: A. Pizzi zeigten, daft die Proteinborate, insbesondere Albuminborat als Holzschutzmittel ffir folgende Anwendungen charakterisiert werden kann: Langzeitwirkung, breites Spektrum, f/.ir Bodenkontakt und hochwirksam. Sie bestehen nur aus der ftir S/iuger ungiftigen Bors/iure und aus nicht toxischen, nattirlichen, zuweilen auch als Abfallprodukte vorkommenden Proteinen. Die Wirkungsweise beruht auf der teilweise reversibelen Fixierung der Bors/lure, wodurch einerseits jederzeit geringe Mengen freier Bors/iure als pilzhemmender Stoff zur Verfiigung steht, andererseits aber das iibliche Auswaschen der Bors/iure drastisch verlangsamt wird. Der Verlauf der Bors/iure-Auswaschung scheint ein...

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Section: Wood Treatmentmentioning

confidence: 99%

Non-toxic albumin and soja protein borates as ground-contact wood preservatives

Thévenon

Pizzi²,

Haluk

1997

Holz als Roh- und Werkstoff

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“…Leachability of boron was determined by placing 2 samples, each in 50 ml of distilled water, under agitation during different times. The leached boron concentration was determined by titration with NaOH in presence of Dmannitol according to the method described by Peylo (Peylo 1993). Total boron quantity contained in treated wood was determined in a similar manner after Soxhlet extraction with distilled water during 12 hours.…”

Section: Boron Leachabilitymentioning

confidence: 99%

Glycerol/Glyoxal: A New Boron Fixation System for Wood Preservation and Dimensional Stabilization

Toussaint-Dauvergne¹,

Soulounganga²,

Gérardin³

et al. 2000

Holzforschung

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“…The supernatants collected after centrifugation were tested for residual boron concentration according to the method of Peylo (1993). After formation of the salt accelerated by warming at 30°C-40°C for 15-20 minutes, the reaction mixture was used to impregnate wood or was used for the formation of a coagulum for further testing.…”

Section: Preparation Of Protein Borates Coagulum and Testingmentioning

confidence: 99%

“…The leached boron concentration was determined by duration with NaOH in presence of D-mannitol according to the method of Peylo (1993). The leached water was then analysed each day for their boron, tannin and protein contents.…”

Section: Preparation Of Protein Borates Coagulum and Testingmentioning

confidence: 99%

Protein Borates as Non-Toxic, Long-Term, Wide-Spectrum, Ground-Contact Wood Preservatives

Thevenon¹,

Pizzi²,

Haluk³

1998

Holzforschung

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Wood preservatives based on protein borates and in particular albumin borate greatly retarded the leaching of boron from treated timber. Accelerated biological tests indicated that boric acid partially fixed to timber by formation of a salt with albumin and other proteins which are then insolubilised by heat-induced coagulation can yield durability comparable to that obtained with CCA wood preservatives. The results of the biological tests show that protein borates, and particularly albumin borate, can be classified as long-term, wide-spectrum, ground-contact, heavy-duty wood preservatives, and are only composed of boric acid, a non-toxic to mammals biocide and of a non-toxic, natural, sometimes waste material, namely a protein. Investigation of the chemical mechanisms of boric acid fixation by the protein indicated that both acid-base salt formation occurs, as well as the further formation at increasing boric acid proportions of additional boric acid/protein complexes. The mechanism is hence only one of partially reversible rather than totally irreversible fixation of boron, leaving at all times small amounts of boron free to exercise its antifungal activity, but drastically diminishing its tendency to leach and greatly retarding its leaching. Boric acid leaching as a function of exposure time appears to tend to an equilibrium value which is different for each type of protein used and differs in the case of treated timber from that obtained by just leaching of the protein borate coagulum.

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Borbestimmung im Holz durch Extraktion mit Mannitol

Cited by 6 publications

References 14 publications

Non-toxic albumin and soja protein borates as ground-contact wood preservatives

Non-toxic albumin and soja protein borates as ground-contact wood preservatives

Glycerol/Glyoxal: A New Boron Fixation System for Wood Preservation and Dimensional Stabilization

Protein Borates as Non-Toxic, Long-Term, Wide-Spectrum, Ground-Contact Wood Preservatives

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