|Articles|September 9, 2019

Using Streptavidin Coated bioZen™ MagBeads for Improvements in an Insulin Aspart Immunocapture Workflow

In this application, Streptavidin coated bioZen MagBeads are utilized for the fast and accurate immunocapture of insulin aspart novolog. By combining immunocapture sample preparation with LC MS/MS, this method demonstrates a functionalized assay that yields greater selectivity and sensitivity.


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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.