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. Author manuscript; available in PMC: 2023 Feb 28.
Published in final edited form as: Anal Chem. 2022 Jun 27;94(27):9618–9626. doi: 10.1021/acs.analchem.2c00711

Figure 2.

Figure 2.

Data showing the stability of cocaine spiked in whole blood (10 μL) on (A) hydrophobic and (B) hydrophilic paper substrates with or without xanthan gum treatment. Different methods of application of polymer were studied to determine if the treatment step affects the resulting enhanced stability. Samples were either diluted 1:1 with exogenous polymer xanthan gum solution (1:1 dilution), coated with exogenous xanthan gum solution after air-drying (coated), or infused with xanthan gum immediately after being deposited onto paper substrates (infused). Corresponding information pertaining to %RSD (<10%) may be found in the Supplementary Information (Table S1)