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Once opened, it should be considered contaminated and must be discarded, as refrigeration alone isnt sufficient for a multi-use vial

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However, to confirm the structure of the unknown compounds, especially those for which reference materials are not available, nuclear magnetic resonance (NMR) spectrometry is recommended (Johansson et al., 2014

Composed of a natural preservative and sterile water, bacteriostatic water reduces the risk of contamination, extends the shelf life of solutions, and efficiently dissolves peptides while maintaining their purity levels