Evaluation of the effectiveness of bleach on microbial population of lettuce

The effectiveness of bleach on the microbial population of lettuce was evaluated. Microorganisms on lettuce before and after washing with bleach were searched and counted and a new dose forcleaning to eliminate a high concentration of bacteria on the lettuce has been proposed to minimize the health risk linked to itsconsumption. The lettuce samples were collected from farms municipalities V and VI of the District of Bamako. Ten lettuces werecollected from different plots and mixed to form a composite sample. The concentration of microbial population was determinedby finding and counting the total microflora in 100g of lettuce composite sample before and after washing with bleach different chlorine concentrations for different contact times. Lettuces grownin Bamako are heavily contaminated with microbial population average between 25 to 1363UFC / g of lettuce. The application of therecommended dose of chlorine (133.10-5mg / l) in Mali for the disinfection of fruits and vegetables for 15, 30 and 60 min resulted ina drawdown respectively 94%, 97% and 99% of the initial microbial population lettuce. The recommended dose and double dose of thisleading to high rates of drawdown of 97% and 99% of the initial microbial population of lettuce. 1% of the concentration of microbialpopulation remains on the treated leaves. Dose which totally Contents lists available at Sjournals Journal homepage: www.Sjournals.comOriginal article eliminates the microflora is 2.6 mg / l of chlorine applied for fifteen minutes. The new dose we can offer is the application of 2.6 mg / l of active chlorine.

کلیدواژه ها:

Lettuce ، Bleach ، Efficiency ، Disinfection ، Concentration of microbial population ،