Table 2

31P NMR chemical shifts of compounds identified in the urine of patients, as a function of urine pH

Compound31P NMR Chemical Shifts2-a
pH 5.1–5.32-bpH 7.8–7.92-b
ppm
AlcoCP20.92  ± 0.01 (5)2-c 20.92  ± 0.01 (5)
CXCP20.76  ± 0.01 (5)20.80  ± 0.05 (5)
CP16.24  ± 0.10 (5)16.24  ± 0.12 (5)
DCCP15.72  ± 0.01 (5)15.73  ± 0.01 (5)
PM12.94 (1) (pH 5.8)14.17  ± 0.02 (2)
PAmAE19.46  ± 0.01 (5)9.48  ± 0.04 (4)
9-OdAP9.11  ± 0.02 (5)9.17  ± 0.05 (5)
KetoCP8.42  ± 0.01 (5)8.72  ± 0.03 (5) (pH 6.9–7.5)
6-OAP6.30  ± 0.03 (2) (pH 6.3–6.4)6.37  ± 0.05 (3)
PAE22.01  ± 0.11 (4)4.30  ± 0.04 (2) (pH 6.6–6.7)
PAEAc1.56  ± 0.05 (5)4.57  ± 0.07 (4)
PAEAm1.58  ± 0.03 (2)4.52  ± 0.10 (4)
Pi 1.01  ± 0.03 (5)3.33  ± 0.08 (5)
PAmA−2.69  ± 0.06 (5)−1.86  ± 0.01 (3) (pH 6.7–6.9)
  • 2-a Chemical shifts are related to external 85% H3PO4. Spectra were recorded at 4°C. Values are mean ± SD.

  • 2-b pH of urine samples analyzed, unless otherwise indicated.

  • 2-c Numbers in parentheses are the number of values.