14 research outputs found
Foraging activity of the attine ant Acromyrmex octospinosus (Reich) (Hymenoptera : Formicidae) on resistant and susceptible yam varieties
International audienc
Chemical resistance of yams to leaf-cutting by the attine ant Acromyrmex octospinosus (Reich)
ISBN 90-6193-642-XInternational audienc
La lutte chimique contre la fourmi attine Acromyrmex octospinosus (Reich) :efficacite de nouvelles matieres actives en conditions naturelles
National audienc
Les nematodes de la canne a sucre dans les Antilles francaises. I : donnees sur les peuplements. II : premiers essais nematicides
National audienc
Principes d'une nouvelle strategie de lutte contre la fourmi-manioc, Acromyrmex octospinosus (Reich), en Guadeloupe
National audienc
Principes d'une nouvelle strategie de lutte contre la fourmi-manioc, Acromyrmex octospinosus reich, en Guadeloupe
National audienc
Ectoparasitic nematodes (Aphelenchoidoidea: Acugutturidae) of Lepidoptera and Blattodea in Guadeloupe
International audienc
Effect of some local plant extracts on fatty acid composition of fish (Alestes baremoze) during smoking and sun drying in the FarâNorth region of Cameroon
Abstract The objective of this study was to assess the antioxidant activities of three plant extracts (Moringa oleifera leaves, Xylopia aethiopica fruits, and Allium cepa leaves) and to evaluate their effects on the preservation of fish polyunsaturated fatty acids (PUFAs) during smoking and sunâdrying processes. PUFAs are highly prone to oxidation during fish processing. The plant extracts were analyzed for their polyphenol contents and were evaluated for their total antiradical capacity. The polyphenol components of each plant were characterized. The hydroethanolic and aqueous extracts were added to the fish at concentrations of 3, 6, 9, and 12âg/L and 10, 20, 30, and 40âg/L, respectively. Butylated hydroxytoluene (BHT) was used as a positive control at a concentration of 2âg/L to compare the antioxidant effects of the plant extracts. The treated fish was subjected to smoking or sun drying and the fatty acid composition of the fish lipid extract was assessed. The results showed that the total polyphenolic, flavonoid, and tannin contents varied significantly from one plant extract to the other (pâ<â.05). The radical scavenging and FRAP increased significantly with the concentration of the plant extracts (pâ<â.05). An HPLC analysis of the extracts led to the preliminary identification of four hydroxycinnamic acids in M. oleifera and X. aethiopica, one anthocyanin and one flavone glycoside in M. oleifera, and four flavanâ3âols in X. aethiopica. Moreover, eight flavonols were preliminarily identified in the three plants. Compared to the control product, these plant extracts significantly protected fish PUFAs from oxidation (pâ<â.05). The aqueous extract of A. cepa at 40âg/L better preserved omegaâ3 in fish during smoking and sun drying than the control product. Incorporating the three plant extracts during smoking and sunâdrying processes can effectively preserve the PUFAs in fish. Therefore, these plants are viable sources of natural antioxidants in the preservation of fish products