19 research outputs found
Environmental influence on phenols and essential oils of Myrciaria cauliflora leaves
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Previous issue date: 2010-05O conteúdo foliar de fenóis totais e de taninos, bem como a composição quÃmica dos óleos
essenciais em populações de Myrciaria cauliflora cultivadas em seis diferentes sÃtios de amostragem
indicou a presença de quatro grupos de amostras de acordo com as caracterÃsticas quÃmicas da
folha e do solo de cultivo. O grupo I incluiu as amostras oriundas do solo franco-arenoso (S1),
caracterizado pela maior e menor percentagem de g-eudesmol (11,55%) e germacreno D (20,48%),
respectivamente, e alto conteúdo de fenóis totais (136,68 mg g-1) e taninos (60,72 mg g-1). O grupo
II, rico em elemol (4,61%), incluiu as amostras cultivadas nos solos franco-arenoso-argilosos (S2,
S3 e S6), enquanto que as amostras dos solos argilosos S4 (grupo III) e S5 (grupo IV) apresentaram
as mais elevadas percentagens de germacreno D (III: 27,20%; IV: 26,83%) e os mais baixos teores
de elemol (2,12–2,55%), fenóis totais (79,69 e 111,77 mg g-1) e taninos (34,04 e 44,51 mg g-1).
A análise de redundância canônica revelou como o balanço de nutrientes do solo e das folhas
influenciou a distribuição dos constituintes quÃmicos nos diferentes agrupamentos. A variação
quÃmica parece ser determinada por fatores ambientais.Foliar contents of total phenols and tannins and the essential oil composition of Myrciaria
cauliflora populations cultivated in six sampling sites have shown the presence of four clusters
related to soil types and foliar nutrients. Cluster I included samples which originated from sandy
loam soil (S1) with the highest and lowest percentages of g-eudesmol (11.55%) and germacrene
D (20.48%), respectively, as well as high total phenol (136.68 mg g-1) and tannin (60.72 mg g-1)
contents. Cluster II, rich in elemol (4.61%), included all the samples cultivated from clay sand
loam soils (S2, S3, and S6), whereas clay soils S4 (cluster III) and S5 (cluster IV) had the highest
amounts of germacrene D (III: 27.20%; IV: 26.83%) and the lowest levels of elemol (2.12-2.55%),
total phenols (79.69 and 111.77 mg g-1), and tannins (34.04 and 44.51 mg g-1). The canonical
redundancy analysis revealed the relationship between chemical balances in the soil and leaf
nutrients in different clusters. Chemovariations may be environmentally determined
Infraspecific variability in the essential oil composition of Lychnophora ericoides
Variations in the composition of the leaf essential oils of wild Lychnophora ericoides, with and without scent, which were grown in three sampling sites, were examined by GC-MS. Results were submitted to principal component and cluster analysis which allowed for two groups of essential oils to be distinguished with regard to scent: cluster I with specimens exhibiting an aromatic scent and containing a high percentage of α-bisabolol (34 ± 23%) and o-cymene (8.4 ± 6.9%); cluster II with specimens without any scent and characterised by a high percentage of caryophyllene oxide (11 ± 9%) and δ-elemene (5.7 ± 6.9%). The two types of oil coexist in all the populations under study, although patterns of aromatic samples deriving from Caldas Novas' State Park reveal chemical differences in relation to the samples from BrasÃlia's National Park and Santo Antônio do Descoberto. Such chemical variations clearly suggest, apart from a geographical influence, genetic differences between individuals in the populations. The high content of α-bisabolol supports the folk medicinal use of arnica as anti-inflammatory
Influence of fruit biotypes on the chemical composition and antifungal activity of the essential oils of eugenia uniflora leaves
The multivariate chemical analysis of essential oils of Eugenia uniflora leaves with different fruit colours indicated the presence of three oil clusters regarding sample biotypes. The first cluster included yellowish, dark red and purple fruits with high percentages of germacrene B (11.1-30.7%), germacrone (9.8-54%) and atractylone (0-19.9%). In cluster II, with bright red fruit samples, the major constituents were curzerene (42.0-43.2%), germacrene D (8.7-9.0%) and germacrene A (5.9-8.9%), whereas cluster III included red-orange fruit samples containing high contents of selina-1,3,7(11)-trien-8-one (40.3-55.4%) and selina-1,3,7(11)-trien-8-one epoxide (12.7-24.4%). The clustered oils were investigated against the systemic fungus Paracoccidioides brasiliensis via the broth macrodilution method. The oil from cluster II revealed the most significant result. The yeast form of P. brasiliensis was completely inhibited at a concentration of 62.5 µg mL-1