The individual components of each batch are mixed and ground together
producing a homogeneous, finely powdered mixture which is then subjected to the
granulation process. Here the powered mixture binds together to form small granules.
Granular culture media offer several advantages when compared with the customary
powder culture media:
n Considerably less dust is formed when handling the media, the dangers of allergic reactions
and inhalation of toxic substances are thus largely eliminated.
n Better flow properties, the media do not adhere to the walls of vessels or apparatus
and are thus easier to weigh out.
n Better coating of the granulate with water reduces the time required for suspending
and dissolving the media, formation of clumps which are hard to dissolve is thus
prevented.
n Homogeneous distribution of the package contents is ensured even after long
storage, the components do not therefore separate out.
n Larger shelf life due to
- low water content
- homogeneous distribution of the contents.
Some culture media form very fine granules as a result of their composition.
The advantages listed above also apply here, particularly as regards the flow
properties and the homogeneous distribution of the contents.
