WATER ACTIVITYFST104FEBRUARY 22, 2012D value (time): Decimal reduction timeΔtime resulting in a10-fold change in viable cells Survival CurveZ value (temperature):ΔT resulting in a10-fold change in D F value (time):D x number of logs reduction temperaturelog (D value)Z valueDecimal Reduction Curve
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Below are survival data for Clostridium botulinumendosporesheld at 240°F. Graphically determine the D240°F for C. botulinumin this medium.Time Held (minutes)Number of Survivors52.2 x 10^7106.5 x 10^6152.3 x 10^6209.1 x 10^5251.2 x 10^5Practice problem #1Answer:10 minutes