Abstract
Interest in organotin(IV) compounds is increasing due to their interesting structural features and possession of biological activities. The objective of this study was to determine the efficacy of novel organotin(IV) complexes against Trametes versicolor and Gloeophyllum trabeum decay fungi. Soil block decay test was performed using T. versicolor and G. trabeum for 16 weeks. Ten 19 × 19 × 19 mm³ sized wood cubes of Alstonia scholaris, Macaranga triloba and Hevea brasiliensis were treated with three levels of concentration (0.1, 0.5 and 1 %) of monomethyltin(IV) (MMT) and monophenyltin(IV) (MPT) of monosubstituted organotin(IV) and dimethyltin(IV) (DMT), diphenyltin(IV) (DPT) and dibutyltin(IV) (DBT) of disubstituted organotin(IV) complexes with 2-acetylpyridine-N(4)-cyclohexyl thiosemicarbazone (APCT) ligand and their respective retention uptake was determined. The best protection against decay fungi was provided by dibutyltin(IV) complex followed by diphenyltin(IV), dimethyltin(IV), monophenyltin(IV) and monomethyltin(IV) complexes with mean weight loss ranging from 4 to 5, 5 to 7, 8 to 9, 10 to 11 and 14 to 19 percent, respectively while the weight loss of the untreated wood cubes varied from 51 to 65 %. Wood densities decreased with increased weight loss. Density reduction of monosubstituted organotin(IV) treated wood cubes was higher than disubstituted organotin(IV) treated wood cubes. Soil block test showed that selected organotin(IV) complexes are effective and among all of them dibutyltin(APCT) complex gave the best protection against the tested T. versicolor and G. trabeum decay fungi.
Zusammenfassung
Organozinn(IV)-Verbindungen finden aufgrund ihrer interessanten Strukturmerkmale und biologischen Aktivität zunehmendes Interesse. Ziel dieser Studie war es, die Wirksamkeit neuartiger Organozinn(IV)-Verbindungen gegenüber den holzzerstörenden Pilzarten Trametes versicolor und Gloeophyllum trabeum zu bestimmen. Freilandversuche im Erdkontakt wurden mit T. versicolor und G. trabeum über eine Dauer von 16 Wochen durchgeführt. Zehn 19 × 19 × 19 mm³ große Prüfkörper aus Alstonia scholaris, Macaranga triloba und Hevea brasiliensis wurden mit drei unterschiedlichen Konzentrationen (0,1; 0,5 und 1 %) von Monomethylzinn(IV) (MMT) und Monophenylzinn(IV) (MPT) der Mono-Organozinn(IV)-Verbindungen sowie Dimethylzinn(IV) (DMT), Diphenylzinn(IV) (DPT) und Dibutylzinn(IV) (DBT) der Di-Organozinn(IV)-Verbindungen mit 2-Acetylpyridine-N(4)-cyclohexylthiosemicarbazone (APCT) Ligand behandelt und deren Einbringmenge wurde bestimmt. Den besten Schutz gegen holzzerstörende Pilze bot die Dibutylzinn(IV)-Verbindung mit einem mittleren Masseverlust zwischen 4 und 5 % gefolgt von den Verbindungen Diphenylzinn(IV) mit 5–7 %, Dimethylzinn(IV) mit 8–9 %, Monophenylzinn(IV) mit 10–11 % und Monomethylzinn(IV) mit 14–19 %. Der Masseverlust der unbehandelten Holzprüfkörper lag hingegen bei 61–65 %. Die Holzdichte nahm mit zunehmendem Masseverlust ab. Der Rückgang der Dichte war bei mit Mono-Organozinn(IV) behandelten Prüfkörpern höher als bei den mit Di-Organozinn(IV) behandelten Prüfkörpern. Die Versuche zeigten, dass die verwendeten Organozinn(IV)-Verbindungen wirksam waren. Den besten Schutz gegen die untersuchten holzzerstörenden Pilze T. versicolor und G. trabeum lieferte die Dibutylzinn(IV)-Verbindung.
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Acknowledgments
This work was supported by the University Malaysia Sarawak (UNIMAS) under a research grant No. E 14052 F07 49 791/2011(01). The authors wish to thank all staff from the Faculty of Resource Science and Technology, UNIMAS for the technical support rendered.
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Rahman, M.M., Jusoh, I., Affan, M.A. et al. Efficacy of novel organotin(IV) complexes on non-durable tropical wood against decay fungi. Eur. J. Wood Prod. 71, 463–471 (2013). https://doi.org/10.1007/s00107-013-0703-6
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DOI: https://doi.org/10.1007/s00107-013-0703-6