Termite antifeedant activity in Aframomum melegueta

Chemical composition of absolute and supercritical carbon dioxide extract ofAframomum melegueta

“…For the SF extract, we observed eight monoterpene hydrocarbons (2.9%), five oxygenated monoterpenes (0.8%), 11 sesquiterpene hydrocarbons (12.2%), seven oxygenated sesquiterpenes and five phenolic alkenones (70.5%). The major components were phenolic alkenones: zingerone (8.0% and 13.1%, respectively), [6]-paradol (35.1% and 13.3%), [6]-shogaol (21.5% and 6.1%), [6]-gingerdione (9.8% and 28.0%), [6]-gingerol (1.3% and 10.0%) and two sesquiterpene hydrocarbons: β-caryophyllene (5.2% and 3.2%), α-humulene (10.5% and 7.2%) for the two extracts. However, there are several difficulties in the identification and quantification of the phenolic alkenones using gas chromatography.…”

“…Prior to quantification, HPLCElectrospray MS was used to identify the individual pungent constituents in the extracts. [6] Quantification of the three phenyl alkenones identified is presented in Table 3. SFE extract is rich in [6]-gingerol compared with absolute.…”

“…[6] Quantification of the three phenyl alkenones identified is presented in Table 3. SFE extract is rich in [6]-gingerol compared with absolute. This can be explained by the degradation of this product during the solvent evaporation cycle used for obtention of the absolute.…”

“…Solvent extracts have been studied for biological and antifeedant activity studies. In 1995, Escoubas et al 6 isolated and identified four aryldecanones from n-hexane and methanolic seed extracts.…”

Composition, and Antimicrobial and Remarkable Antiprotozoal Activities of the Essential Oil of Rhizomes of Aframomum sceptrum K. Schum. (Zingiberaceae)

“…60 species from tropical and subtropical Africa, which are widely used as spices for their seeds and in the traditional medicine, with a convergence in the utilization of the rhizomes as vermifuge and antiparasitic treatment [1] [2]. Compounds isolated from plants of this genus include flavonoids [3], arylalkanones, diarylheptanoids [4], sesquiterpenes, labdane diterpenoids, and triterpenes [5 -7]. Additionally, the essential oils of 16 Aframomum spp., i.e., A. alboviolaceum [8], A. angustifolium [9], A. biauriculatum [10], A. citratum [11], A. corrorima [9] [12 -14], A. danielii [15] [16], A. exscapum [17], A. giganteum [18] [19], A. handbury [11], A. latifolium [15] [20], A. letsuanum [11], A. mala [21], A. melegueta [15] [22], A. pruinosum [11] [20], A. sanguineum [23], and A. stipulatum [24], mostly obtained from the seeds or leaves, were previously investigated, yielding mono-and sesquiterpenes.…”