β-Cyclodextrins as sustained-release carriers for natural wood preservatives
2019
Cai, Lili | Jeremic, Dragica | Lim, Hyungsuk | Kim, Yunsang
Natural preservatives for wood protection have gained increasing attention due to their intrinsic antimicrobial properties, renewability, and lower impact on the environment. We report a study on the use of β-cyclodextrin (βCD) derivatives as sustained-release carriers of allyl isothiocyanate (AITC), as a model natural preservative compound. The formation of AITC inclusion complex in βCDs is qualitatively confirmed by FT-IR and the maximum inclusion yield is estimated to be 39%. Impregnation of wood with the water-borne βCD-AITC complexes allows penetration and even distribution of the preservative in the lumen and possibly in the cell walls. The efficacy of the βCD-AITC complexes as wood preservatives of southern yellow pine is examined by the AWPA E10-16 standard. Compared with the water-treated and AITC-treated wood, βCD-AITC-treated wood exhibits decrease in mass loss from 45% to 25% and no visible cell wall damage after exposure to brown and white rot fungi. The results indicate that βCD suppresses the premature leaching of otherwise volatile AITC and suggests a novel approach of application of volatile or water-immiscible natural preservatives for wood protection.
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