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Calendula officinalis L., is cultivated and used in Cuba for its medicinal properties. Its use has decreased due to its limited availability and propagation problems. Irrigation with magnetically treated water (MTW) is used for its positive effect on the growth and development of plant species. It is proposed to evaluate the effect of irrigation with MTW on quality parameters and in vitro antioxidant activity of foliar extracts in water and ethanol, for use as phytomedicine. Control plants and plants grown with MTW at an induction range of 100-150 mT were used. The treatment favored quality parameters and did not affect the qualitative presence of metabolites. It stimulated the increase of phenolic compounds, flavonoids, DPPH• radical scavenging activity, reducing power and total antioxidant capacity, with the highest values for the ethanol extract. These changes favor the quality of the extracts for future use as phytomedicine. [ABSTRACT FROM AUTHOR]

The physicochemical properties, qualitative phytochemical composition, total phenolic and flavonoid content and free radical scavenging activity of extracts from the leaves of Plectranthus amboinicus (Lour.) Spreng grown with magnetically treated water were evaluated. The extracts from treated plants showed a decrease in pH and an increase in the concentration of total dissolved solids. Furthermore, qualitatively a similar phytochemical composition was observed with respect to its controls and a statistically significant increase in phenolic compounds was evident in the treated extracts, of which the ethanolic compounds had greater antiradical activity. Also, it was verified by thin layer chromatography that all extracts presented compounds with antioxidant activity such as quercetin and rosmarinic acid. These results showed that irrigation with magnetically treated water favored the highest concentration of metabolites related to activity, which increase its antioxidant potential and constitutes the first report of the species grown under these conditions. [ABSTRACT FROM AUTHOR]

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The research was carried out in the Mountain Development Center, placed 470 meters over sea level, the main objective of the research was to know the influence of magnetically treated water in the germination and the morph productive development of lettuce (Lactuca sativa var. Black S-S). Seeds from the Guantanamo's seedbed were used on it. A mono factorial at random system was used, in which irrigation was the main factor (Control: irrigation with no treated water, irrigation with magnetically treated water). Irrigation was used with hose and the rule was applied according to the technical instructions. Sowing was carried out on a substratum made by carbonated brown soil and humus, 3:1 measure. Preparations of soil and agro technique activities were carried out according to technical instructions. Data were analyzed through statistical software STATGRAPHIC plus 5.1. Data showed that irrigation with magnetized water was good for the development of plants. [ABSTRACT FROM AUTHOR]