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Pickering Laboratories
columns and guards are intended for specific
applications that require post-column
derivatization. This technology guarantees
detection of certain classes of compounds at
very low concentrations —amino acids,
carbamate pesticides and polyamines, for
example.
Each column is packed and
tested to separate the target compounds
according to Pickering’s chromatographic
quality control standards and published
analytical method. The following acceptance
criteria apply to all of Pickering’s columns: |
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With
guard column installed, produce a specified
chromatogram of the compounds in a standard test
mixture.
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Separate the compounds in the established order,
with specified resolution of critical pairs.
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Operate within the specified range of back
pressure.
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Be
free of contaminating material which can cause
baseline artifacts.
Only after all criteria have
been met can the column’s serial number and label
be applied.
Quite simply, the column is
guaranteed to produce a chromatogram for its
intended application if it is operated according
to the conditions and methods prescribed by
Pickering Laboratories.
About Guard Columns
While it
is true that any of our columns may be run without
a guard, the practical consequence is a shorter
column lifetime. Guard columns provide protection
against contamination without affecting column
efficiency. It is far less expensive to replace or
repack a guard than an analytical column.
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