Peaks are numbered 1-7 and were shown to coelute
with (1) ursolic acid, (2) epicatechin, (3) caffeic acid, (4) rutin, (5) quercetin, (6) naringenin, and (7) kaempferol.
Since [sup.13]C-containing peptides coelute
with peptides with natural isotopic distribution, both endogenously acetylated and [sup.13]C-acetylated peptides can be fragmented together using a slightly wider isolation window (3.5 m/z compared to 2.0 m/z) than that for standard analyses.
Glycated HbS fractions coelute
with [HbA.sub.2] on HPLC; as a result, the [HbA.sub.2] fraction is overestimated.
Thus, after verifying that FFA peaks did not coelute
with FAME, the procedure of Ichihara et al.
BDE-153, however, is not known to coelute
with other analytes in the method applied by Laboratory 2, and BDE-153 concentrations were almost 2-fold higher in December than in September for three family members (Table 1).
These two compounds were not observed in SRM 3083 by GC-ECD and did not coelute
with other PCB congeners present in SRM 3083 on a 5% phenyl methylpolysiloxane phase or a relatively non-polar phase (described above in Sec.
The chromate, iodide, and chloride peaks were found to coelute
. However, the use of other wavelengths can spectrally resolve these three ions.
Some products may contain GOS disaccharides that coelute
with the lactose in the reference method, leading to an overestimation of lactose and consequently an underestimation of GOS.