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. Author manuscript; available in PMC: 2017 Feb 11.
Published in final edited form as: Toxicon. 2015 Jan 7;95:72–83. doi: 10.1016/j.toxicon.2015.01.003

Fig. 1.

Fig. 1

Measurement of purified ricin and RCA standard concentrations by isotope dilution mass spectrometry. Three different tryptic digestion conditions using 4 µg, 40 µg and 40 µg with reduction and alkylation were used to digest ricin and RCA. Quantity of protein was determined using a peptide based standard calibration curve. The ricin A-chain peptides are denoted in dark gray, ricin B-chain peptide is medium gray and the RCA A-chain peptides are denoted in light gray. Error bars show one standard deviation from the mean for three replicates.