Aqueous solutions of DA (40 mM) and NaIO4 (35 mM) were prepared. A 500 µL aliquot of the DA solution was combined with a 500 µL aliquot of NaIO4, and the solution was vortexed and kept at room temperature for 10 min before an aliquot was taken for HPLC analysis. A 500 µL aliquot of DA (40 mM) was diluted with 500 µL of H2O to produce a 20 mM solution of DA. Two wells on opposite sides of a 96 well plate (e.g., C2 and C11) were loaded with 10 ppm (GT)6-SWCNT in H2O (198 µL) and 2 µL of the 20 mM DA solution was added to each. One well was exposed to a 658 nm laser (104.8 mW) and one was not. The wells were agitated with a pipette every 15 min for 1 h total. After, the contents of the wells were filtered through 100 kDa MWCO centrifuge filters (15,000 rcf, 4 o C, 2 min, fixed angle rotor) to remove the SWCNT and the filtrate was taken for analysis by HPLC. Please refer to supplementary information for HPLC runs and conditions.