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. Author manuscript; available in PMC: 2020 Nov 15.
Published in final edited form as: Anal Chim Acta. 2019 Jul 9;1082:98–105. doi: 10.1016/j.aca.2019.07.015

Figure 2.

Figure 2.

A) Benzoylecgonine ion yield as a function of extraction time after drying analyte onto various threads types: untreated, 30- and 60-min treated substrates. B) Average ion intensity is recorded as a function of blood volume for cocaine deposited on 60-minute treated thread. Calibration curves for diazepam in the concentration range of C) 0.2 – 100 ng/mL and D) 0.2 – 100 pg/mL in 10 μL dried whole blood on untreated and 60-minute treated cotton threads, respectively. Error bars indicate standard deviation for five replicates.