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ird
et al
.:
J
ournal of
AOAC I
nternational
V
ol
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99, N
o
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3, 2016
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Table 2015.13G. Log
10
total aerobic bacterial counts for instant NFDM by 3M Petrifilm RAC Plate vs SMEDP Chapter 6
reference method
Laboratory
Low
Medium
High
Petrifilm RAC
a
SMEDP
b
Petrifilm RAC
SMEDP
Petrifilm RAC
SMEDP
Log
10
CFU/g
Log
10
CFU/g
Log
10
CFU/g
Log
10
CFU/g
Log
10
CFU/g
Log
10
CFU/g
A
c
B
A
B
A
B
A
B
A
B
A
B
1
2.400 2.449 2.083 2.364 3.034 3.087 2.800 2.820 4.391 4.243 3.955 3.858
2
2.364 2.449 2.258 2.344 2.974 2.992 2.779 2.793 4.215 4.165 4.199 4.231
3
2.149 2.233 2.303 2.258 2.935 2.914 3.009 2.974 4.188 4.375 4.108 4.292
4
2.479 2.083
d
2.417 2.083
d
2.876 2.779 2.700 2.664 4.210 4.623 4.140 4.720
5
2.382 2.417 2.417 2.464 3.005 3.087 2.820 2.935 4.246 4.162 4.199 4.137
6
2.417 2.507 2.083 2.400 3.290 3.371 3.146 3.312 4.322 4.241 4.256 4.061
7
2.417 2.382 2.149 2.149 2.881 3.034 2.950 2.870 4.215 4.146 4.199 4.168
8
e
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
9
2.479 2.449 2.417 2.533 2.978 3.053 2.898 2.945 4.046 4.256 4.026 4.362
10
2.400 2.479 2.258 2.449 3.000 3.000 2.904 3.050 4.000 4.000 3.807 3.992
11
2.581 2.533 2.464 2.569 3.173 3.140 3.114 3.171 4.295 4.193 4.279 4.215
12
2.533 2.558 2.258 2.004
d
3.061 2.992 3.231 3.080 4.108 4.368 4.000 4.299
13
2.433 2.400 2.149 2.207 3.026 3.080 2.945 2.914 4.156 4.716 4.134 4.681
14
2.479 2.581 2.624 2.644 3.140 3.159 2.955 2.881 4.065 4.398 4.094 4.306
15
2.382 2.520 2.644 2.449 3.407 3.204 3.613
d
3.143 4.484 4.591 4.267 4.176
16
2.344 2.117 2.382 2.207 2.852 2.876 2.983 2.964 4.162 3.846 4.065 3.974
a
RAC = 3M Petrifilm Rapid Aerobic Count Plate method.
b
SMEDP = Standard Methods for the Examination of Dairy Products Chapter 6 (Standard Plate Count Method).
c
A and B indicate duplicate test portions.
d
Cochran’s outlier.
e
NA = Not available, laboratory did not participate, or did not submit data.
Table 2015.13F. Log
10
total aerobic bacterial counts for pasteurized skim milk by 3M Petrifilm RAC Plate vs SMEDP
Chapter 6 reference method
Laboratory
Low
Medium
High
Petrifilm RAC
a
SMEDP
b
Petrifilm RAC
SMEDP
Petrifilm RAC
SMEDP
Log
10
CFU/g
Log
10
CFU/g
Log
10
CFU/g
Log
10
CFU/g
Log
10
CFU/g
Log
10
CFU/g
A
c
B
A
B
A
B
A
B
A
B
A
B
1
2.303 2.303 2.324 2.004 3.324 3.507 3.258 3.558 4.569 4.581 4.449 4.449
2
3.146 2.904 3.188 2.893 3.904 4.013 3.800 3.914 4.644 4.592 4.708 4.603
3
2.644 2.324 2.733 2.417 3.382 3.793 3.149 3.779 4.757 4.820 4.682 4.807
4
2.507 2.364 2.569 2.433 3.382 3.507 3.344 3.603 4.558 4.682 4.624 4.644
5
2.749 2.945 2.725 2.852 3.708 3.741 3.614 3.581 4.382
d
4.904 4.303
d
4.779
6
e
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
7
e
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
8
e
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
9
2.507 2.533 2.417 2.382 3.700 3.558 3.581 3.449 4.864 4.614 4.764 4.479
10
2.592 2.533 2.449 2.382 3.624 3.592 3.149 3.433 4.654 4.682 4.581 4.654
11
2.581 2.149 2.417 2.233 3.207 3.479 3.233 3.464 4.558 4.417 4.507 4.433
12
2.741 2.764 2.725 2.558 3.507 3.624 3.207 3.433 5.080 4.846 4.717 4.700
13
2.207 2.207 2.083 2.258 3.233 3.179 3.258 3.149 4.281 4.449 4.344 4.382
14
2.233 2.149 2.149 2.233 3.149 3.179 3.149 3.303 4.382 4.303 4.344 4.382
15
1.908 2.083 2.083 2.045 3.258 3.207 3.382 3.507 4.382 4.303 4.258 4.303
16
2.793 2.793 2.708 2.733 3.964 3.814 3.893 3.786 4.955 5.022 4.914 4.920
a
RAC = 3M Petrifilm Rapid Aerobic Count Plate method.
b
SMEDP = Standard Methods for the Examination of Dairy Products Chapter 6 (Standard Plate Count Method).
c
A and B indicate duplicate test portions.
d
Cochran’s outlier.
e
NA = Not available, laboratory did not participate, or did not submit data.