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Biodosimetry of Escherichia coli UV Inactivation in Model Juices with Regard to Dose Distribution in Annular UV Reactors
Author(s) -
OUTCHMA T. K,
ARISI B. P
Publication year - 2004
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.2004.tb17862.x
Subject(s) - escherichia coli , biodosimetry , ultraviolet , chemistry , tracer , kinetics , irradiation , absorption (acoustics) , radiochemistry , distribution (mathematics) , chromatography , microbiology and biotechnology , materials science , biochemistry , biology , mathematics , physics , optoelectronics , quantum mechanics , nuclear physics , ionizing radiation , composite material , gene , mathematical analysis
An annular ultraviolet (UV) reactor as a single vertical segment and 4 segments of variable length connected in series were used to study inactivation kinetics of Escherichia coli and UV‐dose distribution. Both configurations produced linear inactivation curves in model juices. The rate of inactivation decreased as the solution absorption coefficient increased. UV doses for 90% reduction were determined and varied from 4.5 to 6.5 mJ/cm2 in a vertical setup. To study the UV‐dose distribution within a reactor, E. coli was injected and yielded the range from 5.6 to 11.1 mJ/cm2. A modified biodosimetry method using the injection of bacteria as a tracer can be used to evaluate dose delivery in UV reactors .