Olea europaea L. (olive, Oleaceae) constitutes a source of many bioactive compounds, which have recognized benefits for both human health and technological purposes. The present article was carried out to evaluate the biological activity of oleuropein (an ester of 2-(3,4-dihydroxyphenyl) ethanol (hydroxytyrosol) which has the oleosidic skeleton that is common to the secoiridoid glucosides of Oleaceae). It occurred in leaf extracts of the four olive cultivars (Chemlali, Manzanilla, Picaul and Toffahi) as a source for some anticancer and antioxidant agents and their consequences on the action of Hordeum vulgare (barley). The total phenolic and flavonoid compounds were extracted from olive leaves by ethanol 95% then analyzed by high-performance liquid chromatography (HPLC). The study evaluates the anticancer activity of the ethanolic extract of olive leaves against breast and hepatocellular carcinoma cells showing high values. Also, the extract exhibited highly consequence on the antioxidant potentiality of barley which was assessed using the diphenyl picryl hydrazyl method (DDPH). These results pave the way for utilization of olive leaves as a source of natural anticancer and antioxidant agents.
Weed control in crop cultivations is a sustainable approach that can contribute to a reduction in pesticide use as part of an integrated pest management strategy. This study was conducted to evaluate the bio-herbicidal potential of shoot system of Ononis vaginalis Vahl. on Rumex dentatus L.; a major pest of broad bean (Vicia faba L.). General phytochemical screening of O. vaginalis showed an abundant production of allelochemicals as secondary metabolites which may play a role as natural herbicides. Germination and growth bioassays were conducted to investigate the effect of aqueous and crude powder of the donor species on some germination and growth parameters. Results showed that there was no significant effect of low concentrations on seed germination of V. faba in both pure and mixed cultures on contrarily to those recorded for R. dentatus; gradual decrease with increasing O. vaginalis concentrations in both cultures. On the other hand, total phenolics in V. faba shoot and root showed an increase under different treatments except in high concentration treatment. While in R. dentatus, total phenolics and flavonoids fractions in root of V. faba were decreased in response to different concentration treatments. On the other hand, flavonoids increase in shoots of R. dentatus, while decreasing in roots in mixed culture under high concentration treatments. In conclusion, the study confirmed the integration of O. vaginalis in existing weed control management systems. O. vaginalis could be further tested for suppression of weed growth under field conditions.
Background: The present study was concerned with the control (advantage concept) of five most problematic invasive species (Arctium lappa, Datura innoxia, Lantana camara, Prosopis juliflora and Retama raetam) in Egypt. The main objective is to manage and control these species by maximizing and researching their medicinal, agricultural and economic profits. Different approaches of interest were carried out through the probable use of A. lappa, D. innoxia and P. juliflora in medicine as anticancer agents. Results: From the agriculture sustainability point of view, high extract concentration levels of L. camara was used with success to suppress and reduce the germination and growth of Phalaris minor (noxious weed in wheat fields) to be used as ecofriendly bioherbicides. Contrariwise, R. raetam was applied on specific low extract concentration to increase the productivity of some crop species such as Hordeum vulgare under water shortage strategies via stimulating the drought resistance. Conclusion: It is possible to set up various factories for this purpose with the aim of transforming these plants from types harmful to the environment and humans into exporting types for many products that are used medically and agriculturally.
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