keff and N2O : nitrite ratio obtained for the reactions of NO with reducing agents.
| Compound | Functional group | keffa (M−1 s−1) | NO2−: N2Ob | Ref. |
|---|---|---|---|---|
| Benzenethiol | –SH | 110 ± 8 | 1.0 | 40 |
| Cysteine | 25 ± 6 | 1.2 | 40 | |
| BSAc | 0.6 | — | 42 | |
| H2S | 6300 ± 300 | 1.0 | 39 | |
| Ascorbic acid | –OH | 8.1 ± 0.4 | 1.2 | 31 |
| Hydroquinone | 6.0 ± 0.4 | 1.2 | 31 | |
| α-Tocopherol | 3.3 ± 0.4 | — | 32 | |
| Acetaminophen | 1.4 ± 0.6 | — | 32 | |
| Piroxicam | 0.26 ± 0.04 | — | 32 | |
| Isopropylamine | –NH2 | 0.070 ± 0.007 | 1.0 | 41 |
| Diethylamine | –NH | 0.030 ± 0.005 | 1.2 | 41 |
a
pH = 7.4, RT, anaerobic, in the presence of DPTA (diethylenetriamine-pentaacetic acid).
b
Estimated error is (±0.1).
c
Bovine serum albumin (BSA) is a high molecular weight protein (Mr ≈ 7 × 104) that has only one free thiol group.