Antibacterial compounds from Kniphofia isoetifolia

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J Pharm Pharmacogn Res 5(6): 345-353, 2017. DOI: https://doi.org/10.56499/jppres17.264_5.6.345 Original Article Chemical constituents of the roots of Kniphofia isoetifolia Hochst. and evaluation for antibacterial activities [Constituyentes químicos de las raíces de Kniphofia isoetifolia Hocst. y evaluación de la actividad antibacteriana] Melaku Meshesha1, Tsegaye Deyou1, Abebe Tedla2, Negera Abdissa1,* 1Jimma University, College of Natural Sciences, Department of Chemistry, … Continue reading Antibacterial compounds from Kniphofia isoetifolia

J Pharm Pharmacogn Res 5(6): 345-353, 2017.

DOI: https://doi.org/10.56499/jppres17.264_5.6.345

Original Article

Chemical constituents of the roots of Kniphofia isoetifolia Hochst. and evaluation for antibacterial activities

[Constituyentes químicos de las raíces de Kniphofia isoetifolia Hocst. y evaluación de la actividad antibacteriana]

Melaku Meshesha1, Tsegaye Deyou1, Abebe Tedla2, Negera Abdissa1,*

1Jimma University, College of Natural Sciences, Department of Chemistry, P. O. BOX 378, Ethiopia.
2Debre Berhan University, College of Natural and Computational Science, Department of Chemistry, P. O. BOX 445, Ethiopia.

*E-mail: negeraabdisa@gmail.com

Abstract

Context: The genus Kniphofia Moench, with species close to 70, is traditionally used to treat wide ranges of ailments including menstrual pains, infertility, abdominal cramps, wounds, malaria, chest complaint and hepatitis B. Kniphofia isoetifolia, an endemic species in Ethiopia, is known for wounds healing applications in Southern Ethiopia.

Aims: To investigate the roots of Kniphofia isoetifolia and evaluate the extracts and its constituents for antibacterial activity.

Methods: The roots of Kniphofia isoetifolia was extracted with chloroform/methanol (1:1 v/v), and the resulting crude extract was partitioned between EtOAc/H2O. The ethyl acetate extract afforded four compounds after chromatographic purification, and their identification was based on spectroscopic analyses. The extracts and pure compounds were evaluated for in vitro antibacterial activity on four bacterial strains namely Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Enterococcus faecalis.

Results: The purification of the extract of roots of Kniphofia isoetifolia resulted in identification of four compounds (14). This is the first report on the phytochemical investigation of Kniphofia isoetifolia and occurrence of compound 1 in the genus Kniphofia. The extracts and isolates demonstrated antibacterial activity. The Compound 3 in some cases demonstrated comparable zone of inhibition with gentamycin.

Conclusions: This is the first report of the occurrence of naphthoquinone derivative, 3,5,8-trihydroxy-2-methylnaphthalene-1,4-dione (1) in the genus Kniphofia which appears to have a chemotaxonomic significance to narrow down the gap between Alooideae and Asphodeloideae subfamily. The two dimeric anthraquinones (3, 4) showed strong activity with highest zone of inhibition recorded for asphodeline (3) against E. faecalis.

Keywords: antibacterial; inhibition zone; Kniphofia isoetifolia; quinones; roots.

Resumen

Contexto: El género Kniphofia Moench, con cerca de 70 especies, se utiliza tradicionalmente para tratar dolores menstruales, infertilidad, calambres abdominales, heridas, malaria, dolor torácico y hepatitis B. Kniphofia isoetifolia, una especie endémica en Etiopía se usa en la curación de heridas en el sur de Etiopía.

Objetivos: Investigar las raíces de Kniphofia isoetifolia y evaluar la actividad antibacteriana sus extractos y sus componentes.

Métodos: Las raíces de Kniphofia isoetifolia se extrajeron con cloroformo/metanol (1: 1 v / v) y el extracto bruto resultante se repartió entre EtOAc/H2O. Después de la purificación cromatográfica, el extracto de acetato de etilo proporcionó cuatro compuestos que se identificaron mediante análisis espectroscópicos. Se evaluó la actividad antibacteriana in vitro de los extractos y compuestos puros contra Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa y Enterococcus faecalis.

Resultados: La purificación del extracto de las raíces de Kniphofia isoetifolia dio lugar a la identificación de cuatro compuestos (1 - 4). Este es el primer informe sobre la investigación fitoquímica de Kniphofia isoetifolia y la aparición del compuesto 1 en el género Kniphofia. Los extractos y compuestos aislados demostraron actividad antibacteriana. El compuesto 3, en algunos casos, demostró una zona comparable de inhibición con gentamicina.

Conclusiones: Este es el primer reporte de la ocurrencia del derivado de naftoquinona, 3,5,8-trihidroxi-2-metilnaftaleno-1,4-diona (1) en el género Kniphofia que parece tener una significación quimiotaxonómica para reducir el espacio entre Alooideae y la subfamilia de Asphodeloideae. Las dos antraquinonas diméricas (3, 4) mostraron la mayor zona de inhibición registrada para asphodeline (3) contra E. faecalis.

Palabras Clave: antibacteria; Kniphofia isoetifolia; quinonas; raíces; zona de inhibición.

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Citation Format: Meshesha M, Deyou T, Tedla A, Abdissa N (2017) Chemical constituents of the roots of Kniphofia isoetifolia Hochst. and evaluation for antibacterial activities. J Pharm Pharmacogn Res 5(6): 345–353. DOI: https://doi.org/10.56499/jppres17.264_5.6.345
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© 2017 Journal of Pharmacy & Pharmacognosy Research (JPPRes)

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