Agilent / Vankel compatible cannula filters
All filters are U.S. Pharmacopeia compliant where applicable (incl. certificate of conformance) and meet machine manufacturer specifications.
GUARANTEED CHROMIUM AND HEAVY METAL FREE
Agilent and Legacy VanKel baths normally use either cannula style full flow filters or filter
tips. *With Direct Fit, no tygon tubing needed.
THE CANNULA FILTER
Almost every dissolution test relies on samples being taken to produce a result. Filters are used to prevent particles of tablet from
getting into the sample and affecting the spectrophotometer or HPLC results.
Filters should be shown not to absorb any compounds of interest.
All filters are U.S. Pharmacopeia compliant where applicable and meet machine manufacturer specifications.
GUARANTEED CHROMIUM
AND HEAVY METAL FREE
Our PureQuality certification program guarantees our
filters not to have any Chromium, heavy metals, material
contaminants or inorganic elemental interference. These
are the purest and highest quality filters available today.
K E Y CONSIDER ATIONS
Most manufacturers use a filter on the end of the sampling cannula.
These cannula filters are made of Ultra High Molecular Weight (UHMW)
Polyethylene and are completely inert to most compounds.
With filters, porosities are nominal and represent an average pore size
rather than an absolute pore size. Thus a 35µm and 40µm filter will perform
in much the same way.
If in-line filters are used it is important that a small amount of media is
pushed back in the reverse direction to wash particles off the filter back
into the vessel. Particles are part of the tablet and as such should be kept
inside the vessel dissolving with the rest of the tablet.
Failure to do this results in the particles staying on the filter. The effect
of this is not only to remove the particles from the media but next time a
sample is taken, the media is pulled through the particles stuck to the filter
which can give erroneously high readings.
When selecting a filter, it is wise to conduct some tests to ensure that there
is no sample absorption onto the filter. If this is a problem then alternative
filters and materials are available but external filtration may be required.
Types of Filters:
Cannula Filters — Cannula Filters generally have a large surface area and
may affect the hydrodynamics in the vessel. However they have a good
flow rate and may be used when high levels of particulates are present to
prevent particulates blocking the sample probes. A large porosity range
is available. Different manufacturers recommend different filters for use
with their sampling cannula and not all are interchangeable because of
differences in cannula diameter.
Filter Discs — Some low volume sample probes require an In-Line Filter
Disc (or filter frit) which has a lower surface area than a cannula filter.
These are designed to keep the filtration process outside the vessel
but may suffer from blocking due to the lower surface area. These are
designed to keep the filtration process outside the vessel but blockages
may occur due to the lower surface area.
Filter Tips — Filter Tips are smaller than cannula filters and fit on the end
of larger diameter sample probes.
Artikel-Nummer: FILTIP-45
Beschreibung: 45 Micron Filter Tips (PACK/1000)
OEM-Referenz: 17-4140