The aim of this study was to assess its nitrogen and phosphorus concentrations in the Presidio River, because it receives large volumes of wastewater with high loads of detergents and fertilizers. The mean concentrations of total nitrogen and phosphorus determined between February 2008 and January 2009 were 640 and 167 μg L-1, respectively. The permissible phosphorous concentration established by the Official Mexican Standard NOM-001-SEMARNAT-1996 for pollutants discharge into rivers is 5000 μg L-1. However, according to international standards on phosphorous concentrations in continental water bodies, the Presidio River may be considered hypereutrophic.

Abstract: This paper reports biological activities of 1-benzyl-1,2,3-triazoles: antimicrobial by broth microdilution method, antioxidant by DPPH (2,2-diphenyl-1-picrylhydrazyl)• inactivation assay and toxicity by brine shrimp (Artemia salina) assay. The compound 1-(1-Benzyl-1H-1,2,3-triazol-4-yl) cyclopentanol (50 µg/mL to 200 µg/mL) presented selective moderate inhibition of Staphylococcus aureus 3 growth whereas the same effect of 3-(1-Benzyl-1H-1,2,3-triazol-4-yl)propan-1-ol was registered against Escherichia coli AO11, E. coli AO15 and Salmonella enterica serovar Typhi. 5g-i compounds showed the highest DPPH• scanvenging. Synthetic 1,2,3-triazole evaluated compounds were classified in the range moderately toxic to non-toxic. Thus, based in the previously/actually published information, they could be a source of compounds with biological activities of importance for human health.

Resumen: Este artículo reporta las actividades biológicas de 1-bencil-1,2,3-triazoles: antibacteriana por el método de microdilución en caldo, antioxidante por el método de inactivación del DPPH (2,2-difenil-1-picrilhidrazil•) y la toxicidad en el ensayo de artemia (Artemia salina). El compuesto 1-(1-bencil-1H-1,2,3-triazol-4-il) ciclopentanol (50 µg/mL a 200 µg/mL) presentó inhibición selectiva y moderada contra el crecimiento de Staphylococcus aureus 3, mientras que el mismo efecto se registró para el 3-(1-bencil-1H-1,2,3-triazol-4-il)-1-propanol contra E. coli AO11, E. coli AO15 y Salmonella entérica serovar Typhi. Los compuestos 5g-i mostraron la más alta inactivación del DPPH•. Los compuestos sintéticos 1,2,3-triazoles evaluados se clasificaron en el intervalo de moderadamente tóxico a no tóxico. Así, basados en la información publicada actualmente, estos podrían ser una fuente de compuestos con actividades biológicas de importancia para la salud humana.

A facile one-step synthesis of 1H-benzoxazine-2,4-diones from heterocyclic anhydrides and TMSA was described. This paper determines their antimicrobial activity against nine human bacterial pathogens by the broth microdilution method; antioxidant activity by DPPH• inactivation and a ferric-reducing power assay; and toxicity by a brine shrimp, Artemia salina, assay. The 1H-benzoxazine-2,4-dione yields were in the range of 57 to 98%. The novel compound 1H-pyrazino[2,3-][1,3]oxazine-2,4-dione 4c showed the highest antioxidant capacity (DPPH 35.4% and FRAP 0.063 µmol TEs/µmol).