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There is a need for novel, mercury-free UV lamp technology to replace germicidal lamps containing harmful mercury, which are routinely utilized for UV pasteurization of apple juice. In addition, consideration of the changes in response to antimicrobial treatments that may occur when pathogens are adapted to the acid in an apple juice matrix is critical to the practical application of this technology. Based on this, an investigation using 222-nm KrCl excilamp technology, an attractive alternative to mercury lamps, was conducted. Our study demonstrated increased resistance to 222-nm KrCl excilamp treatment as pathogens adapted to acids, and this was due to changes in reactivity to ROS with changes in the fatty acid composition of the cell membrane. Despite increased resistance, the 222-nm KrCl excilamp achieved pathogen reductions of 5 log or more at laboratory scale without affecting apple juice quality. These results provide valuable baseline data for application of 222-nm KrCl excilamps in the apple juice industry.

applied and environmental microbiology

Increased Resistance of<i>Salmonella enterica</i>Serovar Typhimurium and<i>Escherichia coli</i>O157:H7 to 222-Nanometer Krypton-Chlorine Excilamp Treatment by Acid Adaptation

Increased Resistance ofSalmonella entericaSerovar Typhimurium andEscherichia coliO157:H7 to 222-Nanometer Krypton-Chlorine Excilamp Treatment by Acid Adaptation