Monoterpenes metabolism 1,8-cineole

Plants especially from the Lamiaceae family can inhibit the growth of several weeds by releasing phytotoxic monoterpenes (a-pinene, P pinene, camphene, limonene, a-phellandrene, p-cymene, 1,8-cineole, borneol, pulegone, and camphor) (Angelini et al., 2003). The herbicide effect of 1,4-cineole and 1,8-cineole is also described by Dayan et al. (2012). Plants that are exposed to essential oils often metabolize them, and when citral was added geraniol, nerol and their acids appeared. When citronellal metabolization was tested, citronellol and citronellic acid were formed, and with pulegone (iso)-menthone, isopulegol and menthofuran were found (Dudai et al., 2000). 

Cineole, a monoterpene cyclic ether, is known to be a major flavor constituent of lime (Citrus aurantiifolia) and Eucalyptus polybractea has been used for many years as a fragrance and flavoring agent (Miyazawa et al., 2001a). Although there are no in vivo data about the metabolism of... 

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