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Environmental samples
1
(d)
Sample collection devices can be a sponge hydrated with a neutralizing solution to
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inactivate the effects of the sanitizers. 3M recommends the use of a biocide-free
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cellulose sponge. Neutralizing solution can be Dey-Engley (D/E) Neutralizing Broth
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or Letheen broth. It is recommended to sanitize the area after sampling.
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WARNING: Should you select to use Neutralizing Buffer (NB) that contains aryl
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sulfonate complex as the hydrating solution for the sponge, it is required to perform a
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1:2 dilution (1-part sample into 1-part sterile enrichment broth) of the enriched
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environmental sample before testing in order to reduce the risks associated with a
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false-negative result leading to the release of contaminated product. Another option is
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to transfer 10 µL of the NB enrichment in the LS tubes.
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(e)
The recommended size of the sampling area to verify the presence or absence of the
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pathogen on the surface is at least 100 cm
2
(10 cm x 10 cm or 4”x4”). When sampling
15
with a sponge, cover the entire area going in two directions (left to right then up and
16
down) or collect environmental samples following your current sampling protocol or
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according to the FDA BAM, USDA FSIS MLG or ISO 18593 [11] guidelines.
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1.
Allow the Demi-Fraser Broth enrichment medium (includes ferric ammonium
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citrate) to equilibrate to ambient laboratory temperature (20-25
o
C).
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2.
Aseptically combine the enrichment medium and sample according to Table 2.
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3.
Homogenize thoroughly by blending, stomaching, or hand mixing for 2 ±0.2
22
minutes. Incubate at 37 ±1°C for 24-30hours.
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E.
P
REPARATION OF THE
3M™M
OLECULAR
D
ETECTION
S
PEED
L
OADER
T
RAY
25
(a)
Wet a cloth or paper towel with a 1-5% (v:v in water) household bleach solution and
26
wipe the 3M™ Molecular Detection Speed Loader Tray.
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(b)
Rinse the 3M Molecular Detection Speed Loader Tray with water.
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(c)
Use a disposable towel to wipe the 3M Molecular Detection Speed Loader Tray dry.
29
(d)
Ensure the 3M Molecular Detection Speed Loader Tray is dry before use
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31
Specific Instructions for Validated Methods
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AOAC® Performance Tested Method
sm
# 081501
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34
35
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In AOAC PTM studies, the 3M Molecular Detection Assay 2 –
Listeria monocytogenes
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was found to be an effective method for the detection of
Listeria monocytogenes.
The
38
AOAC Research Institute
Expert R view Panel Use Only
OMAMAN-30 A/ Collaborative Study Manuscript
OMA ERP June 2016
ERP Use Only