英语翻译the 1H-NMR spectrum obtained with the test sample and th

英语翻译
the 1H-NMR spectrum obtained with the test sample and that obtained with heparin sodium for NMR identification CRS are compared qualitatively after the 2 spectra have been normalised so as to have a similar intensity ; dermatan sulfate with a methyl signal at 2.08 ± 0.02 ppm may be observed; no unidentified signals larger than 4 per cent compared to the height of the heparin signal at 5.42 ppm are present in the ranges 0.10-2.00 ppm,2.10-3.10 ppm and 5.70-8.00 ppm; signals from the solvent or process-related substances may be present and have to be identified to be accepted; variations in the intensity of some signal regions of the spectrum of heparin may occur :the intensity-variable regions are between 3.35 ppm and 4.55 ppm,where the signal pattern is approximately kept but intensity varies.
— pulse width :to give a flip angle between 30° and 90°.