Fig. 8
From: Freeze-dried plasma proteins are stable at room temperature for at least 1 year
The histogram showing a comparison of the preservation methods of ice ± protease inhibitors, freezing versus freeze drying alongside a positive control for sample degradation as illustrated by C4B-peptide (NGFKSHALQLNNR) by random and independent sampling by LC–ESI–MS/MS. Storage treatments: freeze drying and storage at room temperature (FDRT); freeze drying and storage at −20 (FD-20); freezing storage at −80 °C (−80); or liquid nitrogen (LN2); versus plasma degraded for 96 h at room temperature (96 h RT). The histogram shows the frequency of peptides in each log10 intensity bin. The precursor ion intensity filter of 1000 counts was imposed before examining the data in R