Ultraviolet Inactivation Kinetics of Escherichia coli and Yersinia pseudotuberculosis in Annular Reactors

摘要: Terrorist threats have precipitated the need for information on ultraviolet (UV) resistance of potential biothreat agents in food processing, such as Yersinia pestis. The objective this study was to characterize species UV treatment using a single-lamp annular reactor. A novel method is proposed measure inactivation kinetics pseudotuberculosis, surrogate Y. This can overcome disadvantages traditional collimated beam approach liquids with high absorptive properties, liquid foods. As reference, an rate Escherichia coli K12 caramel model solutions measured first. Both first-order and series-event models were used fit data. For model, constant k(SE)= 0.675 cm(2)/mJ threshold n= 4 obtained E. coefficient determination R(2)= 0.987 standard deviation log(10) reductions sigma(y)= 0.133. 0.984 3 0.972 0.212. In contrast, k(1)= 0.325 0.907 0.354 found coli; 0.557 0.916 0.402 pseudotuberculosis. Based R(2), sigma(y), maximum absolute relative errors, describes pseudotuberculosis better than model. It apparent that less resistant light K12.