|Articles|March 1, 2021

High Recovery of Peptides from Plasma Using Different SPE Sorbents v2

Peptides are extracted from plasma comparing Strata-X PRO SPE to two types of ion exchange polymeric sorbent. Strata-X PRO provides high recoveries with a fast and effective clean-up method.


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Figure 2. Split injection used to measure triplicate test of MTBE, hexane, o-xylene, and 1-methylnaphthalene comparing different solvents (methanol, methylene chloride) and column insertion distances starting with 0.5 mm, 5.0 mm, 10.0 mm, 15 mm, and 20.0 mm. Methanol had the best performance at the 5.0 mm insertion distance and methylene chloride looked slightly better at the 0.5 mm. We would still recommend not going below the 5.0 mm manufacturer recommended insertion distance.
Revisiting insertion distance for methanol and methylene chloride in GC analysis and confirming that insertion depth strongly affects response and reproducibility.