Table 1. Average % Change in DNA Photocleavage Induced by Scavengers and D₂O^ae.

reagents (target)	EDTA (Mn+)	Na benzoate (•OH)	Tiron (O2•–)	D2O (1O2)	catalase (H2O2)
2 no-saltb	–52 ± 8	–30 ± 13	–61 ± 4	–1 ± 1	+6 ± 6
2 saltb	–46 ± 7	–40 ± 4	–74 ± 4	+4 ± 4	+2 ± 2
2 no-saltc	nd	nd	nd	nd	+10 ± 1
2 saltc	nd	nd	nd	nd	–26 ± 4
2 no-saltd	nd	–48 ± 6	nd	–21 ± 3	+13 ± 8
2 saltd	nd	–85 ± 3	nd	+1 ± 2	–68 ± 3

^aPhotocleavage reactions consisted of 38 μM bp of pUC19 plasmid DNA equilibrated with 10 mM sodium phosphate buffer pH 7.0.

^b10 μM2, and either 100 mM EDTA or Na benzoate, 10 mM Tiron, 100 U/μL of catalase, or D₂O (72% final volume) in the absence and presence of 400 mM KCl.

^c2.5 μM2 and 100 U/μL of catalase in the absence and presence of 400 mM KCl.

^d1 μM2, and either 100 mM scavenger, 100 U/μL of catalase, or D₂O in the absence and presence of 150 mM NaCl and 260 mM KCl.

^eb–dSamples were aerobically irradiated for 60 min at 350 nm. Data were averaged over three to five trials with error reported as standard deviation.^dData in row previously published.³⁰