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I need to deproteinate my sample, but dont own any meta-phosphoric acid
So, the unopened answer to how long is bac water good for starts with the printed label, not with a generic internet estimate

For most researchers, a 30 mL vial provides enough water for multiple peptide reconstitutions while remaining well within its shelf life

doi: 10.1186/s40795-016-0064-8 14

What are the potential long-term side effects
