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. 2023 Sep 4;415(26):6449–6460. doi: 10.1007/s00216-023-04921-2

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Fig. 5 — Glucose oxidase assay for different concentrations of glucose in serum samples on different paper surfaces and their respective blue (B) channel intensities. Level of significance *p < 0.05, **p < 0.01, and ***p < 0.001 for comparison between the samples