Glycerol and plant extracts: how long do mixed solutions stay good?

I see many vendors selling plant extracts pre-mixed in glycerol as 'liquid extracts'. Mixed a few batches using powdered licorice and green tea extract and was wondering how long these solutions stay good for without a preservative?

Glycerol really strikes me as an interesting solvent, especially since ethanol can be really smelly.
Picture by Minette Layne. License: CC-BY-NC 2.0. Available here 

Comments

  • perspicaciousperspicacious Member
    edited May 2015
    Quoting from Wikipedia:

    "Glycerol is a stable preserving agent for botanical extracts that, when utilized in proper concentrations in an extraction solvent base, does not allow inverting or reduction-oxidation of a finished extract's constituents, even over several years.

    Both glycerol and ethanol are viable preserving agents. Glycerol is bacteriostatic in its action, and ethanol is bactericidal in its action."


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