UPLC-QTOF-MS analysis of cytotoxic and antibacterial extracts of Hechtia glomerata Zucc.

Hechtia glomerata, a Mexican medicinal plant employed against bacterial infections and as food, is taxonomically related to the genus Tillandsia which has anticancer activity. Organic and aqueous extracts of H. glomerata leaves were prepared and tested for cytotoxic and antibacterial activity. UPLC-QTOF-MS analysis determined the chemical composition of active extracts to find cytotoxic and antibacterial compounds. Hexane extract was cytotoxic against HepG2, Hep3B and MCF7 (IC50: 24-28 µg/mL), whereas CHCl3/MeOH extract against PC3 and MCF7 (IC50: 25 and 32 µg/mL). CHCl3/MeOH extract showed antibacterial activity against Staphylococcus aureus and Enterococcus faecium (MIC: 125 and 62.5 µg/mL). Hexane extract cytotoxic compounds were ß-sitosterol, stigmasterol, phytol and ursolic acid. CHCl3/MeOH extract antibacterial and/or cytotoxic compounds were daucosterol, oleanolic acid, resveratrol, quercetin, kaempferol, apigenin, cyanidin, p-coumaric acid and caffeic acid. This plant could be useful against bacterial infections and cancer. However, in vivo studies are needed to determine its toxicity and therapeutic efficacy.

Evaluación antimicrobiana de un extracto metanólico de Beauveria bassian a contra bacterias patógenas de importancia nosocomial / Performance Evaluation of Maize Starch as a Multifunctional Excipient in Metronidazole Tablet Formulation

Objetivo: Se evaluó la actividad antimicrobiana de un extracto crudo de B. bassiana y dos fracciones del mismo contra bacterias de importancia clínica. Métodos: El micelio de cepa B. bassiana se remojó en metanol durante una semana, después se evaporo en un rotovapor a 45°C aplicando vacío. El extracto metanólico se hizo pasar con dos fases móviles para obtener una fracción A y B. La fracciones A, B y el extracto crudo C se evaluaron contra las cepas Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Salmonella tiphy, Pseudomonas aeruginosa y Acinetobacter baumannii con la técnica de microdilución en placa. Resultados: En la fracción A se observó un efecto antimicrobiano contra Salmonella typhi, Pseudomonas aeruginosa y Acinetobacter baumannii el crecimiento bacteriano alcanzó el 70, 60 y 83 % respectivamente. La fracción B causó un efecto antimicrobiano en Klebsiella pneumoniae, S. typhi, P. aeruginosa y A. baumannii con un crecimiento bacteriano del 62, 58, 41 y 7 % respectivamente. Y El extracto crudo no causó inhibición del crecimiento en A. baumannii, pero para el resto de la bacterias hubo un crecimiento del 56 al 88 %. Conclusiones: Beauveria bassiana es un hongo entomopatógeno que produce diferentes metabolitos con actividad insecticida, citotóxica, antifúngica, antibiótica y antiviral. Este es el primer estudio de los efectos antimicrobianos de un extracto metanólico del hongo entomopatógeno B. bassiana contra cepas bacterianas de importancia clínica

Objective: The antimicrobial activity of a crude extract of B. bassiana and two fractions thereof against clinically important bacteria was evaluated. Methods: The mycelium of strain B. bassiana was soaked in methanol for a week, then it was evaporated in a rotovap at 45 ° C applying a vacuum. The methanolic extract was passed through two mobile phases to obtain a fraction A and B. Fractions A, B and crude extract C were evaluated against the strains Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Salmonella tiphy, Pseudomonas aeruginosa and Acinetobacter baumannii with the plate microdilution technique. Results: In fraction A an antimicrobial effect against Salmonella typhi, Pseudomonas aeruginosa and Acinetobacter baumannii was observed, bacterial growth reached 70, 60 and 83% respectively. Fraction B caused an antimicrobial effect in Klebsiella pneumoniae, S. typhi, P. aeruginosa and A. baumannii with a bacterial growth of 62, 58, 41 and 7% respectively. And the crude extract did not cause growth inhibition in A. baumannii, but for the rest of the bacteria there was a growth of 56 to 88%. Conclusions: Beauveria bassiana is an entomopathogenic fungus that produces different metabolites with insecticidal, cytotoxic, antifungal, antibiotic and antiviral activity. This is the first study of the antimicrobial effects of a methanolic extract of the entomopathogenic fungus B. bassiana against bacterial strains of clinical importance