Variability of Volatile Oils Composition, Tannins, and Phenols from Campomanesia adamantium (CAMBESS.) O. Berg

Campomanesia adamantium (Myrtaceae), known as "guabiroba-do-campo", is a native Cerrado shrub popularly used as anti-inflammatory, antidiarrheal, urinary tract antiseptics. The aims of this study were evaluate the seasonal variability of total phenols and tannins and chemical compounds of the volatile oils of C. adamantium leaves in a period of 12 months. The leaves and flowers were collected in Bela Vista, Goiás, Brazil. The volatile oils were obtained by hydrodistillation in a Clevenger apparatus and analyzed by GC/MS. The determination of total phenols and tannins was performed by the method of Hagerman and Butler. The major compounds of the leaves oils were γ-elemene, limonene, italicene epoxide, β-funebrene, bicyclogermacrene, linalool, and those of flower oil were sabinene, limonene, linalool, tricyclene and methyl salicylate. The total phenols content ranged from 3.75% to 9.56% and tannins content from 2.25% to 4.84%.  It was concluded that the best period for collecting the leaves with the highest index phenols and tannins is the low rainfall. This work represents the first description of the seasonal variability of the essential oils, tannins and total phenols of C. adamantium collected in Bela Vista.