Actividad antibacteriana de diatomeas marinas aisladas de Acapulco, Guerrero, México

Nájera-Arce, Cynthia; Álvarez-Fitz, Patricia; Pérez-Castro, Donaciano; Toribio-Jiménez, Jeiry; Castro-Alarcón, Natividad

doi:10.22370/rbmo.2018.53.2.1293

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…All the evaluated extracts tested positive for alkaloids and glycosides; alkaloids are good bactericidal agents and exert their activity on the membrane. These compounds disrupt the formation of the bacterial Z-ring and inhibit bacterial cytokinesis, which ultimately leads to inhibition of cell reproduction (Barbieri et al, 2017;Nájera-Arce et al, 2018). Additionally, different mechanisms of action have been proposed for glycosides, with indications that they act mainly in the membrane to alter cellular permeability and as chelating agents and inhibit the production of toxins and microbial growth (Mullins, 1990;Rabea et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

Antibacterial activity of seed extracts of various species of the Annonaceae family cultivated in Colombia

Giraldo-Rivera¹,

Álvarez²

2023

Rev. Colomb. Cienc. Hortic

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Public health concerns increase due to microbial propagation and the resistance to existing drugs; therefore, new alternatives are sought, such as the use of natural sources that are antimicrobial agents. Thus, the aim of this study was to evaluate the antibacterial potential of ethanolic extracts of seeds of the species Annona muricata (L.), Annona cherimola (Miller), Annona glabra (L.), Annona reticulata (L.), Rollinia mucosa ([Jacq.] Baillon) and Annona montana (Macfad.) of the Annonaceae family cultivated in Colombia. The bacterial strains correspond to: Staphylococcus aureus (Rosenbach), Enterococcus faecalis ([Andrewes and Horder] Schleifer and Kilpper-Bölz), Bacillus subtilis ([Ehrenberg] Cohn), Escherichia coli ([Migula] Castellani and Chalmers) and Pseudomonas aeruginosa ([J.Schröter] Migula). The antibacterial activity evaluation was performed using the agar diffusion method, each microorganism was inoculated in the medium in a concentration range of 0.2-0.5% v/v and the activity was measured by measuring the inhibition halo. A phytochemical assay was performed to identify the main metabolites to which the activity was attributed. Among the results obtained, it was found the extract of A. montana showed activity against the five bacterial strains, followed by A. glabra; the highest percentage of inhibition achieved was of A. cherimola with 79.86±3.81% activity against E. faecalis; A. reticulata and R. mucosa presented susceptibility only against two bacterial strains, the contrary, the extract of A. muricata did not present any response. The main types of metabolites identified and those attributed to antibacterial potential corresponded to alkaloids, saponins and terpenoids. The above indicates that the plants extract of Annonaceae showed antimicrobial effects. This suggest that species of this family are potential sources of compounds with antibacterial properties, which broadens the knowledge of natural extracts of Colombian materials for use in pharmacotherapy and as alternative for synthetic antibacterial agents.

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Section: Resultsmentioning

confidence: 99%

Antibacterial activity of seed extracts of various species of the Annonaceae family cultivated in Colombia

Giraldo-Rivera¹,

Álvarez²

2023

Rev. Colomb. Cienc. Hortic

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Efectividad del uso de diatomeas en la filtración de bacterias de transmisión hídrica

Vázquez

Salazar

Samaniego

2022

lgr

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La transmisión bacteriana al ser humano puede vehiculizarse por el agua y ocasionar enfermedades entéricas, por lo que el objetivo de la presente investigación es evaluar la efectividad del uso de diatomeas en la filtración de bacterias hidrotransmisibles. El estudio fue realizado en la Universidad Nacional de Chimborazo, Ecuador, desde octubre de 2019 a marzo de 2020, combinando técnicas de cultivo en agar sangre y agar MacConkey; cuantificación de colonias y filtración frente a tiempo y longitud de filtro. Se utilizaron 120 muestras de diluciones de cepas comerciales de Escherichia coli y Staphylococcus aureus para contaminar el agua de tal forma que se pudiera evidenciar la eficacia de la filtración en diatomeas de distinta procedencia. Los resultados fueron contrastados con los rangos establecidos por la Organización Mundial de la Salud y se realizaron controles positivos y negativos de los medios de cultivo y agua. Las diatomeas de Guayaquil fueron las que indujeron a una mejor filtración del agua frente a las diatomeas de Palmira. Al aplicar el lecho filtrante de 10 cm de diatomeas, se obtuvo un crecimiento de 86 UFC/100ml en 24 horas, mientras que al aumentarse la cantidad del filtro a 20 cm se observó un descenso de la carga bacteriana del agua en 21 UFC/100ml en 10 horas. De acuerdo al rango establecido por la OMS el crecimiento bacteriano disminuyó, lo que indica que los filtros de diatomeas tienen la capacidad de retener bacterias. Por esto, se presume que, al combinarlas con materiales adicionales como carbón activado, su potencial filtrante se incrementaría.

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Cenote Chen ha, and water quality indicators

Vizcaíno-Rodríguez¹,

RAVELERO-VAZQUEZ²,

LUJAN-GODINEZ³

et al. 2022

EJRN

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The cenotes of the Yucatan Peninsula are characterized by karstic relief, warm temperatures, and transparency of their water bodies. The mixture of fresh water from infiltrations of rainwater and runoff coupled with underground rivers or marine intrusion, make up the habitat of aquatic, amphibian, and terrestrial species. The Chen ha cenote, located in Chocholá, was used for tourist purposes, however, the lack of an environmental culture and some anthropogenic activities cause deterioration and contamination of the wetland, which putting its conservation at risk. The objective of the present work was to carry out a limnological analysis in Cenote Chen ha, to determine the level of fragility of the ecosystem. The variables analyzed were pH, dissolved oxygen, temperature, conductivity and phytoplankton biodiversity. Results. 2600 µS/cm of conductivity, 8.25 pH and 2.8 ppm of dissolved Oxygen. Phytoplankton: Diatoms 46.2%, Cyanobacteria 38.1%, Chlorophytes 8.1%, Euglenas 5.5%, and Dinoflagellates 2.1% predominated. Asterionella was identified as an indicator species of environmental health. Microcystis aureginosa, Planktothrix agardhii, and Cyanosarcina caribeana, Pseudanaena, Peridium and Gonyaulax species are shown as indicators of environmental contamination. No dominance of any species was observed; however, frequent monitoring of indicator species is recommended.

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Actividad antibacteriana de diatomeas marinas aisladas de Acapulco, Guerrero, México

Cited by 4 publications

References 25 publications

Antibacterial activity of seed extracts of various species of the Annonaceae family cultivated in Colombia

Antibacterial activity of seed extracts of various species of the Annonaceae family cultivated in Colombia

Efectividad del uso de diatomeas en la filtración de bacterias de transmisión hídrica

Cenote Chen ha, and water quality indicators

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