Does Agar Powder Expire?
Dec 24, 2023
Agar powder is a product derived from seaweed. It allows microbes to grow on the surface of petri dishes or test tubes by providing a gel structure for the growth medium.
You may have some old agar powder stored and wonder if it is still usable even though the expiry date has passed.
How Agar Powder is Made
Agar is extracted from the cell walls of red seaweeds (such as gelidium, gracilaria, and porphyra). To produce agar powder, seaweeds are first washed and then boiled to dissolve…
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