The Sanita-kun Aerobic Count consists of a transparent cover film, an adhesive sheet, a layer of nonwoven fabric, and a water-soluble compound film, including a culture medium formula for detection of aerobic microorganisms. The Sanita-kun sheet was validated for 14 food categories in an internal study and an independent study was conducted on ground beef and hot dogs. Both studies showed no significant difference in performance between 5 or 8 replicates of the Sanita-kun sheets and AOAC Method 966.23, excluding some lots of foods. The correlation coefficient to plate count agar in the internal accuracy study was 0.99. The average relative standard deviation for repeatability of total foods was 0.26 and 0.19, respectively, excluding < 10 average counts. The ruggedness study, which examined the influence of incubation temperature and period, recommended incubation of the Sanita-kun sheet at 32.5 +/- 2.5 degrees C for 46 +/- 2 h. Comparison of 3 lots of Sanita-kun sheets showed no decrease of performance in the older lot. The shelf-life of the sheet is at least 14 months. The Sanita-kun Aerobic Counts has been granted AOAC Performance Tested Method status.
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