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778 

B

ird

et al

.

:

J

ournal of

AOAC I

nternational

V

ol

. 98, N

o

. 3, 2015

Table 6. Total yeast and mold log

10

counts for raw almonds by 3M Petrifilm RYM Count Plate after 48 h incubation at 25

°

C versus FDA BAM (ref. 1) and ISO 21527 (ref. 4)

reference methods

a

Uninoculated control

Low

Medium

High

Petrifilm RYM FDA BAM/ISO 21527

b

Petrifilm RYM FDA BAM/ISO 21527

Petrifilm RYM

FDA BAM/ISO 21527

Petrifilm RYM FDA BAM/ISO 21527

Lab

A

c

B

A

B

A

B

A

B

A

B

A

B

A

B

A

B

1

<1.00

<1.00

1.00

d

<1.00

1.30

1.30

1.78

1.85

1.60

1.30

2.28

1.95

1.78

e

1.90

e

2.04

f

2.40

f

2

1.30

d

1.00

d

1.30

d

1.85

d

1.78

1.60

2.04

1.70

1.30

1.90

2.11

2.34

1.95

e

2.15

e

2.64

2.84

3

<1.00

<1.00

<1.00

<1.00

1.30

1.30

1.60

1.60

2.34

2.28

2.38

2.18

3.56

3.11

3.30

3.11

4

g

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

NA

5

<1.00

<1.00

<1.00

<1.00

1.30

1.00

1.78

1.95

2.30

2.15

2.30

2.45

3.41

3.04

3.18

3.18

6

<1.00

<1.00

<1.00

<1.00

1.48

1.30

2.20

1.78

1.00

h

2.00

h

2.34

2.20

3.08

3.15

3.36

3.28

7

<1.00

<1.00

<1.00

<1.00

1.78

1.30

1.70

1.30

2.45

2.20

2.43

2.11

3.20

2.90

3.20

3.11

8

<1.00

<1.00

<1.00

<1.00

1.85

1.95

1.00

1.00

2.49

2.45

2.00

2.08

3.26

3.51

3.00

3.08

9

<1.00

<1.00

<1.00

<1.00

1.30

1.30

1.48

1.00

2.53

2.46

2.56

2.53

3.08

3.00

3.04

3.00

10

<1.00

<1.00

<1.00

<1.00

1.30

1.00

1.30

1.00

2.08

2.43

2.00

2.56

3.26

3.11

3.30

3.04

11

<1.00

<1.00

<1.00

<1.00

1.00

1.48

1.48

1.60

2.00

2.08

1.95

1.90

3.08

3.04

3.15

3.08

12

<1.00

<1.00

<1.00

<1.00

1.60

1.78

1.30

1.00

2.08

2.30

2.00

2.00

3.60

3.36

3.40

3.08

13

<1.00

<1.00

<1.00

<1.00

1.48

1.30

1.48

1.30

2.00

2.20

1.78

1.95

2.90

2.90

2.90

2.95

14

<1.00

<1.00

<1.00

<1.00

1.48

1.60

1.70

1.78

2.45

2.23

2.76

2.08

3.43

3.00

3.40

3.23

15

<1.00

<1.00

<1.00

<1.00

1.78

1.70

1.78

1.85

2.45

2.26

2.45

2.30

3.23

2.90

3.41

3.41

a

 Log

10

yeast and mold CFU/g.

b

 FDA BAM and ISO 21257 reference method replicates were enumerated at 5 and 7 days (uninoculated test portions) of incubation at 25

°

C.

c

 A and B = Indicated duplicate test portions.

d

 Data not included in statistical analysis for this contamination level.

e

 Double Grubbs’ outlier.

f

 Single Grubbs’ outlier.

g

 Laboratory data not included in statistical analysis for all contamination levels.

h

 Cochran’s outlier.