Research Article

Antimicrobial Activity of Moringa oleifera Leaf Extracts against Streptococcus pneumoniae Isolates

Richard Kagia
Kabarak University, Kenya
Carolyne Chepkirui
Kabarak University, Kenya
Michael Walekhwa
Kabarak University, Kenya
* Corresponding author
Teresa Ogeto
Kabarak University, Kenya
Titus Suge
Kabarak University, Kenya
Mary Murithi
Kabarak University, Kenya
Ferdinand Ndubi
Kabarak University, Kenya
Esbon Wambugu
Kabarak University, Kenya
Hadan Baiwo
Kabarak University, Kenya
Zablon Malago
Kabarak University, Kenya
Fred Kipsang
Kabarak University, Kenya
DOI icon 10.24018/ejbio.2021.2.4.223

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Submitted 2021-06-25
Published 2021-08-08

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Article Main Content

Pneumococcal diseases (PD) constitute a major threat to the global public health stability especially in the developing world. The risk is greater for children under 5 years, the elderly and persons living with compromised immune systems. Antibiotic agents, conjugate as well as polysaccharide vaccines have been available for several decades and have saved many lives. However, the burden of PD has consistently remained high resulting in poor quality of life and strained economic tenets. Constant resistance to available antibiotic agents and low access to vaccines constitute major setbacks to efforts meant to scale down the burden of PD. The need to explore more viable and promising options is not only urgent but also untenable. We profiled the pharmacological credentials of Moringa oleifera extracts as a possible efficacious alternative to conventional prophylactic and therapeutic interventions.  Methanol and ethanol extracts of air-dried leaves of Moringa oleifera plant were subjected to phytochemical screening to identify the presence of carbohydrates, proteins, saponins, alkaloids, tannins, flavonoids, phyto-sterols, oils, and fats. A working solution of the two extracts was prepared by dissolving 20 mg & 40 mg of the extracts in 1ml of 99.9% dimethyl sulfoxide solvent. Sterilized 6 mm blank discs were loaded with 20ul of the final extract concentrations and incubated at 45 ºC for 20 hours. Dimethyl sulfoxide (100% DMSO) impregnated discs and 30 mcg ceftriaxone antibiotics were used as negative and positive controls respectively. Colon morphology on gentamicin blood agar (GBA) and blood agar (BA), gram staining and optochin assay were leveraged to identify Streptococcus pneumoniae. Disk diffusion method on Muller Hinton agar was used to evaluate sensitivity of Streptococcus pneumoniae to the subject extracts. Methanol and ethanol extracts were found to contain carbohydrates, proteins, saponins, tannins, flavonoids, steroids, fixed oils, alkaloids, and cardiac glycosides. Both extracts were found to contain flavonoids, tannins, and phenolic compounds. Ethanol & methanol extracts had lower anti-bacterial activity as compared to the 30 mcg positive control. Further exploration to reveal the anti-bacterial activity of aqueous based extracts on Streptococcus pneumoniae is strongly recommended

Keywords: Moringa oleifera, Pneumococcal disease, Streptococcus pneumoniae

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