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. Author manuscript; available in PMC: 2021 Feb 20.
Published in final edited form as: Analyst. 2020 Jul 7;145(16):5615–5623. doi: 10.1039/d0an00857e

Figure 3.

Figure 3.

Full mass spectra of hemoglobin found in fresh blood on 100% cotton thread fibers recorded (A) at the onset of the spray within 0.67 – 0.89 min and (B) after 1.47 min of spray time. The spray solvent was a MeOH/H2O, 1:1, solution with 5% acetic acid (pH 3). Hemoglobin α-chain = 15154.4 ± 1 Da and β-chain = 15871.5 ± 1 Da were detected in several charge states.