Antitermite activities

Reyes-Chilpa, R. et al., Antitermitic activity of Lonchocarpus castilloi flavonoids and heartwood extracts, J. Chem. Ecol, 21, 455, 1995. 

Past research has confirmed that many quinones are present in teak heartwood (Sandermann and Simatupang 1966, Windeisen et al. 2003, Lukmandaru and Takahashi 2009). It is also proved that the quinone and its derivatives exhibit antitermitic activities (Sandermann and Simatupang 1%6 Rudman and Gay, 1%1). It is reported that the composition of these quinones vary with tree age (Lukmandaru and Takahashi 2009 Lukmandaru 2009), site and tree type (Sandermann and Simatupang 1966 Windeisen et al. 2003). This study investigated the variations in quinone constituents of teak (tectoquinone, deoxylapachol, isodeoxylapachol, lapachol, and tectol) and chemotaxonomic study based on the quinones and other related components. 

Dihydronootkatone (17), which shows that citrus odor possesses antitermite activity, was also treated in A. niger to obtain 115-mono- (18) and lll -dihydroxylated products (19) (the ratio 115 and 11/ = 3 2). On the other hand, Aspergillus cellulosae reduced ketone group at C2 of 17 to give 2a- (20) (75.7%) and 2p-hydroxynootkatone (21) (0.7%) (Furusawa et al., 2003) (Figure 20.11). Tetrahydronootkatone (22) also shows antitermite and mosquito-repellant activity. It was incu-... 

Tetrahydronootkatone (22) also shows antitermite and mosquito-repellant activity. It was incubated with Aspergillus niger to give two similar hydroxylated compounds (23,13.6% and 24, 9.9%) to those obtained from 17 (Furusawa, 2006) (Figure 15.12). 

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