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Life sciences · Journal article
Kashmir Journal of Academic Research and Development · August 26, 2026
Early or partial results. Treat as a signal, not a conclusion.
This is a bench-top phytochemical and in vitro antimicrobial study characterizing bioactive compounds in four Pakistani medicinal plants and their inhibitory activity against E. coli O157:H7 in agar diffusion assays. The findings are exploratory; they describe dose-dependent inhibition zones in vitro but do not establish clinical efficacy, toxicity, pharmacokinetics, or any comparison to standard therapeutics beyond a single positive control antibiotic.
In vitro phytochemical and antimicrobial screening study. Four medicinal plant species (Azadirachta Indica, Melia Azedarach, Withania Coagulans, Nigella Sativa) sourced from Pakistan; laboratory culture of E. coli O157:H7.. Intervention: Hydro-methanolic plant extracts at 100–400 mg/mL concentration.. Compared with: Ciprofloxacin (positive control).. Study conducted in Pakistan; specific laboratory or institution not stated..
Gallic acid was predominant phenolic in A. indica (83.28%), M. azedarach (83.36%), and W. coagulans (98.61%); sinapic acid dominated N. sativa (74.59%) M. azedarach showed largest inhibition zone at 400 mg/mL (12.21 ± 1.16 mm), followed by N. sativa (9.03 ± 1.47 mm), A. indica (8.98 ± 1.97 mm), and W. coagulans (8.81 ± 1.39 mm) Antibacterial activity was dose-dependent across 100–400 mg/mL concentrations
Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.
This work is preclinical and does not yet support clinical use or therapeutic recommendations. Further work—including toxicology, animal models, and clinical trials—would be required before these plant extracts could be considered for therapeutic development.
In vitro phytochemical and antimicrobial screening study with no clinical outcome, animal model, or comparison to established antimicrobial agents beyond a single positive control; findings are exploratory and require substantial further validation.
As stated by the source record.
Quoted from the source exactly as published.
This work is preclinical and does not yet support clinical use or therapeutic recommendations. Further work—including toxicology, animal models, and clinical trials—would be required before these plant extracts could be considered for therapeutic development.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Medicinal Plants are a rich source of bioactive compounds having anti-microbial properties and effectiveness against infectious diseases, have a greater affinity to mitigate antibiotic resistance, and to produce alternative, economical veterinary therapeutics. This study aimed to determine the phytochemical composition of Azadirachta Indica, Melia Azedarach, Withania Coagulans, and Nigella Sativa, and their antimicrobial properties against E. coli O157:H7. The plants were sequentially extracted using hydro-methanolic solvent. Phenolic acids (Gallic acid, Sinapic acid, Caffeic acid) and Flavonols (Myricetin, Quercetin, Kaempferol) were quantified using Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC). Antibacterial activity was assessed using the Agar Well diffusion assay at concentrations of 100–400 mg/mL, with ciprofloxacin as the positive control. HPLC revealed gallic acid as the predominant phenolic compound in A. indica (83.28%), M. azedarach (83.36%), and W. coagulans (98.61%), while sinapic acid dominated in N. sativa (74.59%). Flavonol composition varied, with kaempferol highest in A. indica (80.84%), myricetin in M. azedarach (63.08%) and N. sativa (100%), and quercetin in W. coagulans (65.92%). Antibacterial activity was dose-dependent, with the hydro-methanolic extract showing the highest activity at 400 mg/mL. M. azedarach exhibited the largest inhibition zone (12.21 ± 1.16 mm), followed by N. sativa (9.03 ± 1.47 mm), A. indica (8.98 ± 1.97 mm), and W. coagulans (8.81 ± 1.39 mm). The study concluded that the medicinal plants used were rich in phenolic compounds, showing strong antimicrobial properties against E. coli O157:H7, and can be used as a promising candidate for an affordable antibiotic alternative.
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