Microanalysis filter holders are used for filtering liquid samples under
vacuum for microbiological or particulate analyses
Microanalysis
filter holders are used for filtering liquid samples under vacuum for
microbiological or particulate analyses. 47 mm diameter holders are used for
analyzing (<500 ml) of liquid whereas 90mm holders are used for filtering
larger volumes or samples that are viscous or have heavy particle or bioburden
that would tend to clog a 47mm diameter filter.
Three basic types
of holders (stainless steel, Teflon®, and sintered glass) are available in two
diameters (47 and 90mm). Microanalysis filter holders with stainless steel
screens are recommended when filtering viscous or proteinaceous solutions to
maximize the flow rate. In addition, this filter is used when the purpose of
filtration is to produce an ultraclean filtrate as the screen will not shed particles
into the filtrate. The microanalysis filter holder with Teflon® gasket
eliminates the problem of the membrane adhering to the ground glass surface
post autoclaving. Microanalysis holders with sintered supports are used for
general filtration (this is most common model sold).