The study was carried out to assess antibacterial activity of 50% alcoholic cold
extract of Aloe vera against pathogenic strains of E.coli, Staphylococcus aureus, Streptococcus
pyogenes, Pseudomonas aeruginosa using extract impregnated disc by disc diffusion method. The
present study revealed that 50% alcoholic cold extract of Aloe vera L. (37.52 + 0.77 mg/ disc) was
effective against all the bacteria by disc diffusion method. The study concluded that 50% alcoholic
cold extract of Aloe vera L. had significant antibacterial activity but lesser than reference antibiotic
ciprofloxacin.
Key words: Aloe vera L., Antibacterial activity, Medicinal Plants.
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