All data were acquired using a Bruker Advance 400 MHz NMR spectrometer, operated at 400.13 MHz at 25 °C. The spin–lattice relaxation rates were measured using the standard inversion-recovery (180°–τ–90°–t)n sequence. The τ values used for the experiments were 0.01, 0.02, 0.04, 0.06, 0.1, 0.2, 0.4, 0.8, 1, 3, 5, 7, 20, and 25 s. The delay time t in this case was 25 s. The 180° selective inversion of the proton spin population was obtained through a selective soft Gaussian perturbation pulse (width: 20 ms, power: 60 dB) with an excitation width of about 45 Hz. The addition of HSA did not change the viscosity of the system, and the observed Rsei enhancements were mainly affected by the ligand–protein complex formation. All NMR data processing and analyses were performed using Topspin 2.1 software (Bruker BioSpin, Ltd.).
Advance 400 mhz nmr spectrometer
Manufactured by Bruker
Sourced in Germany
The Bruker Advance 400 MHz NMR spectrometer is a high-performance nuclear magnetic resonance instrument designed for analytical applications. It operates at a frequency of 400 MHz and is capable of conducting various NMR experiments to analyze the structure and properties of chemical compounds.
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4 protocols using advance 400 mhz nmr spectrometer
1
NMR Spin-Lattice Relaxation Measurements
2
NMR Spectrum Analysis of PPN Compound
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The NMR spectrum of PPN was obtained with Bruker Advance 400 MHz NMR spectrometer (Hannover, Germany) using DMSO as the solvent.
3
Polymer Characterization by GPC-NMR
4
1H NMR Spectroscopy Standardized Protocol
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The 1 H NMR measurements were performed using a Bruker Advance 400 MHz NMR spectrometer with an acquisition time of 3.2 s, a pulse repetition time of 2.0 s, a 30° pulse width, 5208-Hz spectral width, and 32 K data points. Chemical shifts were referred to the solvent peaks (δ = 7.26 and 2.50 ppm for CDCl 3 and DMSO-d 6 , respectively).
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