Table 1.
Experimental molecular weights (Exp. MW) and mean peak widths (full width at half-maximum) for the example spectra shown in Figure 1a, and mean relative abundances (Rel. abun.) from the three replicate measurements taken at each ammonium acetate concentration
| [Ammonium acetate] (M) | Monomer (44,929 Da) | Dimer (89,858 Da) | Hexamer* (269,574 Da) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Exp. MW (Da) | Mean FWHM (m/z) | Rel. abun. (%) | Exp. MW (Da) | Mean FWHM (m/z) | Rel. abun. (%) | Exp. MW (Da) | Mean FWHM (m/z) | Rel. abun. (%) | |
| 1.41 | 45,623 ± 39 | 47 ± 6 | 59 ± 7 | 91,685 ± 15 | 60 ± 4 | 39 ± 6 | 272,227 ± 74 | 70 ± 6 | 2 ± 1 |
| 1.14 | 45,585 ± 8 | 45 ± 4 | 48 ± 1 | 91,566 ± 28 | 56 ± 4 | 48 ± 1 | 271,967 ± 104 | 71 ± 4 | 3 ± 2 |
| 0.95 | 45,552 ± 16 | 37 ± 2 | 43 ±4 | 91,469 ± 39 | 52 ± 3 | 51 ± 3 | 272,206 ± 92 | 64 ± 6 | 5 ± 2 |
| 0.68 | 45,614 ± 5 | 44 ± 5 | 43 ±8 | 91,560 ± 32 | 55 ± 1 | 51 ± 6 | 271,601 ± 59 | 75 ± 4 | 6 ± 2 |
| 0.45 | 45,587 ± 38 | 36 ± 3 | 23 ± 9 | 91,474 ± 38 | 53 ± 7 | 55 ± 6 | 271,817 ± 92 | 72 ± 6 | 22 ± 4 |
| 0.34 | 47,129 ± 382 | 136 ± 38 | 21 ± 7 | 93,885 ± 138 | 118 ± 7 | 66 ± 4 | 274,268 ± 214 | 98 ± 5 | 13 ± 4 |
| 0.22 | N/A | N/A | N/A | 91,406 ± 132 | 101 ± 62 | 15 ± 26 | 271,479 ± 158 | 71 ± 6 | 85 ± 26 |
*
Experimental molecular weights are corrected with the method of McKay et al. [32]. Errors for both experimental molecular weight and mean FWHM are reported as one standard deviation from the mass spectra shown in Figure 1. Errors in relative abundance correspond to one standard deviation in the three replicate measurements.