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The how long peptides last in powder form article explains why lyophilized peptides are so much more resilient than reconstituted ones

Despite these advantages, many current HILIC methods still rely on chemical derivatization to achieve adequate sensitivity [48, 59,60,61] or depend entirely on MS/MS specificity while neglecting optimal chromatographic separation, which can lead to severe matrix interferences and ion suppression [41]

Proteins are fragile

1 H NMR (400 MHz, DMSO-d6) = 4.78 (s, 2H), 3.52 (t, J = 7.0 Hz, 4H), 2.66 (t, J = 7.1 Hz, 4H), 1.53 (s, 6H)