223 / 596
9
matrices tested in the study are shown in Table 2. The limit of detection of the 3M
1
Molecular Detection Assay 2 –
Listeria monocytogenes
method is 1-5 colony forming
2
units per validated test portion size (in Table 2).
3
4
Table 2.
Enrichment protocols using Demi-Fraser Broth at 37 ± 1 °C according to AOAC
5
Performance Tested
SM
Certificate #081501.
6
7
Sample Matrix
Sample Size
Enrichment
Broth Volume
(mL)
Enrichment
Time (hr)
Beef hot dogs, Queso
Fresco, Vanilla Ice
Cream, 4% Milk Fat
Cottage Cheese, 3%
chocolate whole milk,
romaine lettuce, bagged
raw spinach, cold
smoked salmon
25 g
225
24-30
Raw chicken
25 g
475
28-32
Deli turkey
125 g
1125
24-30
Cantaloupe
Whole
melon
Enough
volume to
allow melon to
float
26-30
Environmental
samples:
Stainless
steel
1 sponge
225
24-30
Sealed
concrete
1 sponge
100
24-30
Plastic
1 swab
10
24-30
8
F. P
REPARATION OF THE
3M™M
OLECULAR
D
ETECTION
H
EAT
B
LOCK
I
NSERT
9
Place the 3M™ Molecular Detection Heat Block Insert in a dry double block heater unit.
10
Turn on the dry block heater unit and set the temperature to allow the 3M Molecular
11
Detection Heat Block Insert to reach and maintain a temperature of 100 ±1°C.
12
NOTE:
Depending on the heater unit, allow approximately 30minutes for the 3M Molecular Detection
13
Heat Block Insert to reach temperature. Using an appropriate, calibrated thermometer (e.g., a partial
14
immersion thermometer, digital thermocouple thermometer, not a total immersion thermometer) placed in
15
the designated location, verify that the 3M Molecular Detection Heat Block Insert is at 100 ±1°C.
16
G. P
REPARATION OF THE
3MM
OLECULAR
D
ETECTION
I
NSTRUMENT
17
1.
Launch the 3M™ Molecular Detection Software and log in.
18
2.
Turn on the 3M Molecular Detection Instrument.
19
AOAC Research Institute
Expert Review Panel Use Only
OMAMAN-30 A/ Collaborative Study Manuscript
OMA ERP June 2016
ERP Use Only