Abstract:
The purpose of this research was to evaluate antimicrobial activity of Citrus limon on pathogenic bacterial
species Escherichia coli. Lemon is a citrus fruit and is an important medicinal plant of family Rutacea. It is
used mainly for its alkaloids that have a large spectrum of biological activity against clinically significant
bacterial strains of pharmaceutical interest. Citrus juices are greatly consumed because of their
nutritional value and special flavor that are beneficial for the maintenance of good health and prevention
of diseases. There is an increase in antibiotic resistance by microorganisms leading to extensive research
on new effective and less expensive antimicrobials from natural sources. E. coli have the genetic ability to
transmit and acquire resistance to drugs which are utilized as therapeutic agents and his has been
intensified by the overuse and misuse of antibiotics. There is a need to find new methods that combat the
resistance of microorganisms. Lemon can be used as an alternative antiseptic against E.coli because
natural products contain complex compounds that make it difficult for the microorganism to gain
resistance. This study showed the antimicrobial properties of lemon extracts. Sensitivity testing of lemon
antimicrobial activity was carried out using disc diffusion method to determine zones of inhibition.
Minimum inhibitory concentration of the lemon extracts was determined against E.coli. The study
showed that lemon juice contained strong antimicrobial properties followed by ethanol extracts then
water extracts. The differences between the zones of inhibition of juice and the two extracts was
significant.
