The stability of this product in solution has not been specifically investigated but is expected to be quite robust. This material is a component in a number of classical liquid culture media products, which are assigned a shelf-life of three years. Please see the link below to review a sampling of these media formulations:
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/282/935/d9785for.pdf
Please see the link below to review a publication that offers additional information on the stability of this material in solution:
https://pubmed.ncbi.nlm.nih.gov/34384471/