Long time storage (archiving) of peptide, protein and tryptic digest samples on disposable nano-coated polymer targets for MALDI MS

• Long time storage (archiving) of biological specimens on MALDI MS targets.
• Nano-coated polymer-based microscope format MALDI MS target.
• One-way and cheap MALDI MS target.
• Storage of peptides and proteins in the MALDI MS matrix for six months.
• Reanalysis of partly used MALDI MS sample preparations.

Archiving of biological specimens is important due to the importance of reanalysis of already prepared MALDI MS samples or simultaneuous analysis of a sample series. Proteins/peptides and digests were prepared for measurement on a polymer-based metal nano-coated MALDI target and subjected to various storage conditions (−80 °C to RT) in a vacuum-sealed pouch and at atmosphere for 6 months. The MS data gathered from these preparations illustrate trends in the aging of different samples and to find optimal storage conditions (−20 or −80 °C in low oxygen environment). The disposable/low cost target proved to be a suitable platform for storage and MALDI MS.

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