Proton nuclear magnetic resonance (1H-NMR) was carried out on an Ascend™ 400 MHz nuclear magnetic resonance spectrometer (Bruker) using chloroform-d or DMSO-d as solvents. Fourier transform infrared (FTIR) spectroscopy was undertaken on a PerkinElmer 70 system using KBr pellets. UV-visible characterization was achieved on a Lambda 950 spectrophotometer (PerkinElmer) using a 1 cm quartz cuvette. Dopamine standard solution with a concentration range of 0–10 mg L−1 was prepared. A dopamine standard curve was obtained according to the absorbance of that solution at 280 nm. The content of catechol groups in PDA-PAA-PEO was measured by comparing the absorbance of PDA-PAA-PEO solution (40 mg L−1) with the dopamine standard curve. Elemental analysis was conducted on a Vario EL Cube (Elementar). Gel permeation chromatography (GPC) was done on a Waters 2414 system.
Ascend 400 mhz nuclear magnetic resonance spectrometer
Manufactured by Bruker
The Ascend™ 400 MHz nuclear magnetic resonance (NMR) spectrometer is a laboratory instrument designed to analyze the molecular structure of chemical compounds. It operates at a frequency of 400 MHz and uses a strong magnetic field to align the nuclear spins of atoms within a sample, allowing the detection and measurement of their resonance frequencies.
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Lab products found in correlation
2 protocols using ascend 400 mhz nuclear magnetic resonance spectrometer
1
Physicochemical Characterization of PDA-PAA-PEO
2
Characterization of PCL-based Polyurethane by NMR
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Before NMR measurement, 10 mg of PCL-based polyurethane was dissolved in 1 ml of deuterated chloroform (Seedchem, Australia) with tetramethylsilane as an internal standard. 1H-NMR spectra were carried out at a temperature of 300 K using Bruker Ascend 400 MHz Nuclear magnetic resonance spectrometer in our experiment. Each specimen was scanned 32 times to obtain the average of spectrum. Chemical shifts were referenced relatively to chloroform at 7.26 ppm in 1H-NMR spectra. Peaks on those spectra were delimited and integrated using the Topspin 3.0 software.
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