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mericon
E. coli Detection Workflows 8/2015
38
Comments and suggestions
Weak or no signal in the internal amplification control
a) The PCR conditions do
not comply with the
protocol
Check that PCR conditions match the cycling
protocols in Table 8, page 25. Repeat PCR with
corrected settings, if necessary.
b) The PCR was inhibited Use the recommended DNA isolation method in
this workflow. If there is inhibition, dilute DNA
sample and repeat PCR
c) The storage conditions
for one or more kit
components did not
comply with the
instructions given in
“Storage” (page 7)
Check the storage conditions and the expiration
date (see the kit label) of the reagents and use a
new kit, if necessary.
d) The
mericon
PCR Assay
has expired
Check the storage conditions and the expiration
date (see the kit label) of the reagents and use a
new kit, if necessary.
Signals present for the negative controls
a) Contamination
occurred during PCR
setup
Repeat the PCR with new reagents in replicates.
If possible, close the PCR tubes directly after
addition of the sample to be tested.
Make sure to pipet the positive controls last.
Make sure that the work space and instruments
are decontaminated at regular intervals.
b) Contamination
occurred during
extraction
Repeat the extraction and PCR of the sample to
be tested using new reagents.
Make sure that the work space and instruments
are decontaminated at regular intervals.
OMAMAN-36 C: Method User Guide/Package Insert
ERP Use Only
January 2017
AOAC Research Institute
Expert Review Panel Use Only