Antimicrobial Activity of Copper Alone and in Combination with Lactic Acid against Escherichia coli O157:H7 in Laboratory Medium and on the Surface of Lettuce and Tomatoes
Figure 1
Populations of E. coli O157:H7 on the surface of (a) lettuce and (b) tomato samples treated with copper (Cu) and lactic acid (La) solution with and without Tween 80 (T80) as surfactant. The error bars represent the standard deviations for replicate samples. Means with different letters over the error bars are significantly different (). (1) Control, (2) Tween 80, (3) Cu 20 ppm, (4) Cu 20 ppm + T80, (5) Cu 40 ppm, (6) Cu 40 ppm + T80, (7) La 0.2%, (8) La 0.2% + T80, (9) La 0.2% + Cu 20 ppm, (10) La 0.2% + Cu 20 ppm + T80, (11) La 0.2% + Cu 40 ppm, and (12) La 0.2% + Cu 40 ppm + T80.
