the residual solvent peak. When the exchange rate between H20 and HDO is slow on the NMR time...
Results of using oxygen-I7-enriched water to study the proton NMR of an aqueous solution of angiotensin 11 acetate are presented. The Carr-Purcell-Meiboom-Gill (CPMG) sequence is used to attenuate the water peak, and all solute peaks are observed without interference. For 2D experiments, the ...
Those remarks also apply to other NMR problems solved previously with the continuous wavelet transform, such as quantification or dynamical phase correction. 展开 关键词: wavelets Gabor transform peak suppression time-frequency analysis time-scale analysis ...
Can you dissolve in D2O, remove the solventin vacuo, then dissolve it again? If neither of these are realistic options, there are various water suppression NMR experiments, or water non-excitation schemes. The simplest version of the former is to saturate the water peak with a long, low-pow...
glycerol-dominant and glycerol solvent.CThe average interaction energy between Ca2+or PO43−with glycerol or water in the solvents at the beginning 0–2 ns.DThe average interaction energy between a primary cluster (constituted by one Ca2+and one PO43−) and solvent molecules in the time...
Mescher M, Tannus A, O’Neil Johnson M, Garwood M.Solvent suppression using selective echo dephasing. J Magn Reson A 1996; 123:226–229. (First description of the MEGA technique) Mescher M, Merkle H, Kirsch J, et al.Simultaneous in vivo spectral editing and water suppression. NMR Biomed...
The melting enthalpy of the eutectic of a polar solvent and water may be reduced by ultrasonic treatment in the liquid state. These results agree with the data from NMR of water and the absorption peak at 1150 nm for free water. These results show that water–polar solvent interaction can ...
NMR studies of coupled low- and high-barrier hydrogen bonds in pyridoxal-5'-phosphate model systems in polar solution. This coupling is lost in aqueous solution where the intramolecular O2H2N2 hydrogen bond is broken by solute-solvent interactions. However, in methanol, ... S Sharif,GS Denisov...
taiwanensiswas 5.21–8.59 g GAE/100 g, depending on the state of the peels (fresh, freeze-dried, and hot air dried) (Ciou et al., 2008). A cascade utilization of water caltrop recovered the phenolics with a yield of 80.2 mg/g (dry weight) (acetone as the solvent) (Akao et al.,...
The structures of the five compounds were confirmed by FT-IR, 1H NMR, 13C NMR and high-resolution mass spectral analysis (HRMS). The cis-trans isomerization of compounds B1-3 could be judged by the FT-IR spectra that they all showed a strong peak at 950 - 1050 cm−1, which ...