Estudo Químico de Ananas (A. comosus, A. bracteatus e A. lucidus) e dos Fungos Endofíticos (Acremonium curvulum e Fusarium oxysporum) isolados de Ananas lucidus

Abstract

The chemical study of three Ananas species (A. comosus, A. bracteatus and A. lucidus) and the endophytic fungi Acremonium curvulum and Fusarium oxysporum, both isolated from A. lucidus, are described. The phytochemical investigations of roots, leaves and steams from A. bracteatus yielded the isolation of three micro molecular compounds: kumatekenin (1), glycosilated sitosterol (2) and sitosterol (3). From leaves of A. lucidus it was isolated a mixture of three monoacylglicerols (4) and 5-(hydroxymethyl)-2-furaldehyde (5). The fatty acid composition of leaves and roots from A. bracteatus and A. lucidus, as well as in vitro A. comosus, A. bracteatus and A. lucidus was investigated. Twenty-one fatty acids, as methyl ester derivatives, were identified in eight studied samples, 16 (76%) of them saturated and 5 (24%) unsaturated acids. From the fungus A. curvulum three compounds were isolated: phenetyl 2-hydroxypropionate (6), ergosterol (7) and tryptophol (8). The chemical investigation of the organic extracts from F. oxysporum led to the isolation of tetra(S)-butirolactone (9) and the diastereoisomeric mixture of (4R*,5S*)-5-hydroxyhexan-4-olide (71%) and (4R*,5R*)-5-hydroxyhexan-4-olide (29%) (10). Structure elucidation of the isolated compounds was done by spectrometric analysis such as infrared, 1H and 13C NMR, including bidimensional techniques (COSY, HMQC e HMBC), mass spectrometry as well as literature comparison.