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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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Original Research Articles                      Volume : 14, Issue:4, April, 2025

PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com /
submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2025.14(4): 177-188
DOI: https://doi.org/10.20546/ijcmas.2025.1404.021


Antagonistic and Growth-Promoting Effects of Solanum nigrum Leaf Extracts on Bacterial Strains and Actinomycetes: A Comparative Solvent Extraction Approach
Amaramma B. Yaraladdi and Neethu Asokan*
Department of Lifesciences, Sri Sathya Sai University for Human Excellence, Kalaburagi, Karnataka, India
*Corresponding author
Abstract:

Traditional medicinal plants are widely used for their therapeutic properties, yet scientific validation of their bioactive compounds remains limited. Solanum nigrum (black nightshade) is known for its nutritional and medicinal properties, including antagonistic potential. This study investigates the antagonistic effects of Solanum nigrum leaf extracts against Bacillus sp. and Staphylococcus sp. using different solvents. Bacterial antagonism was evaluated by inoculating the extracts into sterile nutrient broth containing bacterial cultures. Growth inhibition was assessed using a colorimeter at 600 nm, with absorbance values indicating bacterial activity. Growth promoting assay was performed to understand the effect of extract on beneficial microbial growth. A positive control (bacterial growth without extract) and a negative control (no bacterial growth) were maintained for comparison. Cold water extracts exhibited minimal inhibitory effects on bacterial growth. Methanol extracts demonstrated significant antagonistic activity, with reduced absorbance values for both bacterial strains. Dichloromethane extracts exhibited the highest antagonistic potency, with complete inhibition observed at higher concentrations. The results suggest that non-polar compounds in Solanum nigrum are more effective in bacterial inhibition. Similarly, the plant extract showed growth promoting activity for Actinomycetes an Bacillus subtilis. Solanum nigrum exhibits strong antagonistic activity, particularly in methanol and dichloromethane extracts, indicating the presence of bioactive compounds with antimicrobial properties. These findings support the plant’s potential as a natural antagonistic agent. Further studies should focus on isolating potent bioactive compounds using chromatography and exploring their applications in pharmaceutical and therapeutic fields.


Keywords: Solanum nigrum, antagonistic activity, growth promotor, water extraction, solvent extraction


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How to cite this article:

Amaramma B. Yaraladdi and Neethu Asokan. 2025. Antagonistic and Growth-Promoting Effects of Solanum nigrum Leaf Extracts on Bacterial Strains and Actinomycetes: A Comparative Solvent Extraction Approach.Int.J.Curr.Microbiol.App.Sci. 14(4): 177-188. doi: https://doi.org/10.20546/ijcmas.2025.1404.021
Copyright: This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike license.

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