Home Cosmetic Science Talk Formulating Glycerol and plant extracts: how long do mixed solutions stay good?

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

    Posted by Silkster on May 25, 2015 at 9:21 pm

    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.

    perspicacious replied 9 years ago 2 Members · 1 Reply
  • 1 Reply
  • perspicacious

    Member
    May 27, 2015 at 11:28 am

    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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