Pka, Ph And Efficacy Of Weak Acids And Peracetic Acid Page 3
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4PAA vs. Salmonella at pH's 5, 7, 8, 9, 10
All Solutions were dosed to a nominal 5 ppm PAA (using the modified DPD Low Range Test)
Feedstock: Perasan MP-2.
Neutralized with thiosulfate.
Final Report:
12/22/2010
Technicians:
Tina Rodrigues B.Sc.
Courtney Mesrobian B.Sc.
Log10 CFU/ml Remaining /
Percent Reduction
pH (time)
Test 1
Test 2
Test 1
Test 2
Date Completed
Control (pH 5)
7.34/NA
N/A
N/A
N/A
12/3/2010 (#1)
5 pH (1 min)
6.51/0.83
N/A
85.21%
N/A
5 pH (5 min)
2.09/5.25
N/A
99.999%
N/A
5 pH(10 min)
1.59/5.75
N/A
>99.999%
N/A
5 pH (20 min)
1.23/6.11
N/A
>99.999%
N/A
Control (pH 7)
6.95/NA
7.81/NA
N/A
N/A
12/10/2010
7 pH (1 min)
5.59/1.36
7.11/0.70
95.64%
80.05%
7 pH (5 min)
2.21/4.74
4.30/3.51
99.998%
99.969%
7 pH (10 min)
1.56/5.39
2.78/5.03
99.999%
99.999%
7 pH (20 min)
1.74/5.21
2.15/5.66
99.999%
99.999%
Control (pH 8)
6.95/NA
6.95/NA
N/A
N/A
12/14/2010
8 pH (1 min)
6.77/0.18
6.33/0.62
33.93%
76.06%
8 pH (5 min)
0/>6.95
0/>6.95
>99.999%
>99.999%
8 pH (10 min)
0/>6.95
0/>6.95
>99.999%
>99.999%
8 pH (20 min)
0/>6.95
0/>6.95
>99.999%
>99.999%
Control (pH 9)
6.95/NA
6.95/NA
N/A
N/A
12/14/2010
9 pH (1 min)
6.74/0.21
6.80/0.15
38.34%
29.21%
9 pH (5 min)
5.85/1.10
5.11/1.84
92.06%
98.55%
9 pH (10 min)
0/>6.95
0/>6.95
>99.999%
>99.999%
9 pH (20 min)
0/>6.95
0/>6.95
>99.999%
>99.999%
Control (pH 10)
6.95/NA
7.81/NA
N/A
N/A
12/10/2010
10 pH (1 min)
7.10/0
TNTC/0
0%
0%
10 pH (5 min)
7.00/0
TNTC/0
0%
0%
10 pH (10 min)
6.85/0.10
TNTC/0
20.57%
0%
10 pH (20 min)
6.65/0.30
7.00/0.81
49.88%
84.51%
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