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- W4375853839 abstract "A fresh dual presaturation (pre-SAT) method was developed to quantify analytes accurately near the suppressed water signal in 1H NMR spectra obtained from H2O-rich samples. The method includes an extra dummy pre-SAT with a suitable offset for each analyte signal in addition to the water pre-SAT. The residual HOD signal at 4.66 ppm was observed using D2O solutions containing l-phenylalanine (Phe) or l-valine (Val) and an internal standard of 3-(trimethylsilyl)-1-propanesulfonic acid-d6 sodium salt (DSS-d6). When the HOD signal was suppressed using the conventional single pre-SAT method, the measured concentration of Phe from the NCH signal at 3.89 ppm decreased by a maximum of 48%, whereas the dual pre-SAT method gave a reduction in the Phe concentration measured from the NCH signal of less than 3%. The proposed dual pre-SAT method achieved accurate quantification of glycine (Gly) and maleic acid (MA) in a 10 vol % D2O/H2O solution. The measured concentrations of Gly of 513.5 ± 8.9 mg kg-1 and MA of 512.2 ± 10.3 mg kg-1 corresponded to sample preparation values of Gly of 502.9 ± 1.7 mg kg-1 and MA of 506.7 ± 2.9 mg kg-1 (the number after ± indicates the expanded uncertainty (k = 2))." @default.
- W4375853839 created "2023-05-10" @default.
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- W4375853839 date "2023-05-08" @default.
- W4375853839 modified "2023-10-17" @default.
- W4375853839 title "Fresh Dual Presaturation Method for Analyzing H<sub>2</sub>O-Rich Samples Using Quantitative <sup>1</sup>H NMR" @default.
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- W4375853839 doi "https://doi.org/10.1021/acs.analchem.2c05639" @default.
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