Filtration is an exciting sterilization an approach in laboratories. That the only an approach that uses force to separate quite than come kill. As soon as you filter a liquid or gas, the passes through a pore, i m sorry stops, or filter out, the passage of bigger particles. Filtration relies on sharp sizes, the smaller the pores the an ext particles it can screen out, but it additionally takes much more energy to force the liquid through it. Spicy sizes can be as tiny as .01 μm (μm=micrometer), little enough to protect against viruses indigenous passing through, however smaller proteins can still get through. There are even really little filters called nano-filters, which avoid viruses, proteins and also some toxins.

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Bottom line? Filtration is a good option for sterilizing heat-sensitive liquids, which cannot be autoclaved or sterilized by various other sterilization methods. In this blog post, us will explore the means in i beg your pardon different species of filtration equipment work, and the practical benefits and disadvantages of making use of them in a activities setting.

What Is Filtration and How Does it work?

Filtration is different from various other sterilization methods. Wikipedia specifies sterilization together a procedure that eliminates (removes) or death (deactivates) all creates of life and other biological agents. Up until now all the sterilization methods we spanned deactivate or kill bacteria and viruses. Filtration is the first and only sterilization technique that eliminates bacteria by separating the microorganisms from the sterilized medium, yet unlike other sterilization methods, that doesn’t death or avoid the bacteria"s ability to reproduce. The way it functions is actually really simple. She probably familiar with water filters uncovered in one office or in ~ home, or a coffee percolator, every one of which usage the same straightforward mechanism of filtration.


Filtration provides membranous filters that have tiny pores the let the liquid happen through however prevent bigger particles such as bacteria to pass v the filter. Therefore, the smaller the pore, the much more likely the filter is come stop much more things native going with it. If the pores of a filter, i beg your pardon is designed to eliminate a microbe, i m sorry is a microscope organism, are tiny enough, they should be able to stop every living things from pass through.

Filtration that Liquids in the Lab

In laboratories, liquids room filtered with microbial filters to remove any kind of microbes present. That is an effective an approach of sterilization for heat sensitive liquids. There room four varieties of filters:

Membrane filters room thin filters that room made the cellulose. They have the right to be offered for sterilization throughout injection by put the membrane between the syringe and the needle.Seitz filters are usually make of asbestos. They space pad-like and also thicker 보다 membrane filters.Sintered glass filters are an alternative type of filter that space made of glass and also hence execute not absorb liquids during filtration.Candle filters space made the clay-like mud. This unique mud has tiny pores make by algae. The microbes get stuck throughout their travel v the pores.

Filtration Techniques

There is more than one filtration technique. Reverse Osmosis is provided in residence filtration systems. Other common methods space nano-filtration, ultra-filtration, micro-filtration and particle filtration. We will not talk about these different techniques since they are past the border of this article, but it’s vital to understand that are number of techniques and each an approach is an ideal for a details application. Here’s a graph that mirrors the different uses of this filters:


To amount up the first section that the article watch this video that demonstrates filtration in the lab:

Advantages of Filtration

Relatively inexpensive, except for those v the the smallest pore sizesFilters do not clog easilySuitable for warmth sensitive liquids together filters execute not usage heatThey have the right to filter huge volumes of fluid reasonably fast

Disadvantages that Filtration

Filters deserve to only job-related on liquids and gassesAutoclaving is generally cheaper than filtration because filters are expensive come replace, especially nano-filtersGlass filter are very brittle and also can break easilyMembrane filters rupture easilyThe systems in Sietz Filters might get absorbed by the filter pad itselfClogging may occurLong process


Let’s recap. We explored that filters space a physical an approach that separates microbes favor bacteria indigenous liquids. Then us explained typical uses that filtration in the lab. We space thankful because that filters as they play critical role in laboratory virus research due to the fact that Charles Chamberlain an initial used them in the so late 19th century. But, if possible, it’s constantly recommended come sterilize a solution with one autoclave and also use filtration only once autoclaving is impossible. The rule is that any solution offered in the lab should be sterilized.

What form of filtration perform you usage in your lab? we’d love to hear your take top top filtration in the comments section below.

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