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The overall results demonstrated that the selected EOs components, particularly SAB, C3 and C4 are of interest as new lead molecules to both prevent biofilm set-up and to control pre-established biofilms of E. coli and S. aureus. This article is protected by copyright. All rights reserved.

This review article deals with organic synthesis from the perspective of selenium-77 nuclear magnetic resonance (NMR) spectroscopy. Different types of organic reactions are briefly discussed, incorporating mechanism aspects through 77 Se NMR observable intermediates and byproducts. The 77 Se NMR experiments are demonstrated in terms of structural characterization and new insights for organic reactions. The ability to visualize different molecules in a reaction mixture provides a facile and versatile route for the development of synthetic organoselenium compounds. Thus, the review describes the strategies accomplished mainly in the past five years in the syntheses and applications of the organoselenium compounds, focusing on 77 Se NMR spectroscopy.

Context: Psidium cattleianum Sabine (Myrtacea) is rich in vitamin C and phenolic compounds, including epicatechin and gallic acid as the main components. Objective: To evaluate the antifungal and antioxidant capacity in vitro of the essential oil of araçá (EOA). The acute toxicity of the EOA also was evaluated in mice. Materials and methods: The leaves of the P. cattleianum were extracted by steam distillation. The antioxidant capacity was evaluated by in vitro tests [1,1-diphenyl-2-picryl-hydrazyl (DPPH), 2,2-azinobis(3-ethylbenzothiazoline-6-sulfonate) (ABTS), ferric ion reducing antioxidant power (FRAP), linoleic acid oxidation, thiobarbituric acid reactive species (TBARS)], and ex vivo analysis [TBARS, d-aminulevunilate dehydratase (d-Ala-D) and catalase activity, non-protein thiols (NPSH), and ascorbic acid levels]. The toxicity was studied in mice by a single oral administration of EOA; and the antifungal activity was performed with five strains of fungi. Results: The EOA exhibited antioxidant activity in the FRAP assay and reduced lipid peroxidation in the cortex (I max ¼ 32.90 ± 2.62%), hippocampus (IC 50 ¼ 48.00 ± 3.00 mg/ml and I max ¼ 32.90 ± 2.62%), and cerebellum (I max ¼ 45.40 ± 14.04%) of mice. Acute administration of the EOA by the oral route did not cause toxicological effects in mice (LD 50 4500 mg/ml). The EOA also showed antifungal activity through of the determination minimum inhibitory concentration (MIC) values ranging from 41.67 ± 18.04 to 166.70 ± 72.17 mg/ml for tested strains. Conclusion:The results of present study indicate that EOA possess antioxidant properties, antifungal and not cause toxicity at tested doses.

Abstract:We describe herein an efficient protocol to synthesize selanyl-substituted pyrazoles by cyclocondensation and copper-catalyzedd irect C À H bond selenation reactions.T he products were obtained in moderate to excellent yields by the onepot multicomponent reactions of hydrazines,1 ,3-diketones andd iorganyl diselenides,u sing catalytic amounts of copper bromidea nd bipyridine.T hese reactions tolerated ar ange of substituents in the starting materials and provedt ob ea nefficient methodologyf or combinatorial synthesis of news elenium-containing pyrazoles with potentiala pplications in biological studies.