Showing papers on "Xylopia aethiopica published in 2004"

Composition and antioxidant activity of the essential oils of Xylopia aethiopica (Dun) A. Rich. (Annonaceae) leaves, stem bark, root bark, and fresh and dried fruits, growing in Ghana.

Abstract: The chemical composition of the essential oils obtained from the leaves, the barks of the stem and the root, as well as from the fresh and dried fruits of Xylopia aethiopica, growing in Ghana, was investigated by gas chromatography/mass spectrometry analyses. Kovats indices, mass spectra, and standard compounds were used to identify a total of 93 individual compounds. The monoterpene hydrocarbons formed the main portion in all studied samples. β-Pinene was predominant in all cases, while trans-m-mentha-1(7),8-diene was the main compound in the essential oils of the leaves and the barks of roots and stems. Their potential antioxidant activity was also investigated and found to be significant in scavenging superoxide anion radical. Keywords: Xylopia aethiopica; Ghana; volatile constituents; leaves; fruits; stem bark; root bark

The Chemical Constituents of the fruit essential oil of Xylopia aethiopica (Dunal) A. Rich from Nigeria

Abstract: Systematic and comprehensive analyses of the essential oil of fruits of Xylopia aethiopica (Annonaceae) were conducted. The fruit essential oil was obtained in 0.42% yield. The gas chromatographic-mass spectrometric (GC–MS) analyses showed that the essential oil comprised mainly of monoterpenoids with 1,8–cineole (15.15%) being the most prominent compound. Sabinene (6.6%) and terpinen-4-ol (4.1%) were present in moderately significant amounts. The sesquiterpenoid contents identified were β-elemene (1.26%) and caryophyllene oxide (3.83%).

Women and forest development in Nigeria

Abstract: The leading role of Nigerian women in forest development has been highlighted. As repositories of knowledge in the uses of forest products, a list of forty-nine plants belonging to 34 Families commonly collected by women, their uses, and parts of the plant used are provided. As the women’s activities concerning the forests are predominantly in herbal medicinal trade, they promote peace and harmony among ethnic groups through their activities. Thus plants such as Aristolochia ringens, Allium sativum found in Northern Nigeria and T etrapleura tetraptera, Xylopia aethiopica commonly found in the South are exchanged through herbal trade. The article argues that the activities of women that engender conflict prevention, should be encouraged.

The toxicity of hexanolic extract of xylopia aethiop]ca to laboratory reared larvae of cx. p. quiuefasciatus.

Abstract: The hexanolic extract ofXylopia aethiopica (Ethiopean pepper) was tested for acute toxicity on the larva of Culex p. quiquefasciatus reared in the laboratory of the Department of Biological Sciences University of Agriculture Abeokuta, Nigeria. Five concentrations: (5Oppm, lOOppm, 2000ppm, 300ppm and 400ppm) were evaluated for acute toxicity on the larvae and total percentage mortalities recorded at intervals of I, 12,24,48 and 96 hours in each test. Effects of sunlight and ultra violet radiation on stability of the extract's potency at 2,4, and 8 hours respectively were equally examined. The mean lethal concentration LC50 was 257ppm. Toxicity of Xylopia aethiopica on Culex p. quiquefasciatus larvae was gradual and persisted throughout the test period. Sunlight exposure has no significant effect on the potency of Xylopia oil while ultra-violet radiation activated the larvicidal properties.