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The color changes of L-ol (10 μM) towards various competitive species (50 μM) in PBS aqueous buffer (DMF:PBS = 7:3, 20 mM, pH = 7.4). 1. Free L-ol, 2. HOCl, 3. Br–, 4. AcO–, 5. Cl–, 6. F–, 7. HSO3–, 8. HSO4–, 9. S2–, 10. NO2–, 11. NO3–, 12. OH–, 13. PO42–, 14. SO32–, 15. HCO3–, 16. Pi, 17. PPi, 18. HOCl, 19. 1O2, 20. ONOO–, 21. ·OH, 22. H2O2, 23. Cys, 24. Hcy, 25. GSH.
