Efficacy of pyroligneous acid from pineapple waste biomass as wood preserving agent

Abstract

Improper management of lignocellulosic biomass generated from agricultural activities would lead to serious environmental problems. Pyrolysis offers a simple yet efficient alternative technique where Pyroligneous acid (PA) is a major by-product obtained during slow pyrolysis of lignocellulosic biomass. In this study, the potential anti-termites and anti-fungal properties for PA obtained from the pyrolysis of pineapple waste biomass were investigated. PA from pineapple waste biomass showed insignificant inhibition properties against both Pycnoporus sanguineus and Coriolus versicolor, but were successful in inhibiting the growth of both Aspergillus niger and Botryodiplodia theobromae for 7 days when applied at 70% (v/v) and 100% (v/v) concentrations. PA also exhibited good anti-termites properties based on the 100% mortality of Coptotermes curvignathus after one week incubation. GC-MS analysis revealed the presence of phenolic compounds and phenol with ortho substituents such as 2,6-dimethoxyphenol and 2-methoxy-4-methylphenol. Both compounds have been reported to play an important role in termiticidal activity from previous studies. This study indicates that PA from pineapple waste can act as antifungal and antitermite agents but not as anti-wood decaying fungi. This result can be used as a good preliminary indication for future application of PA from pineapple waste biomass as wood preservative.