Methanol, in contrast, was prepared within a range of 0.01128 to 0.055% v/v, corresponding to 1.128 to 5.5% v/v in real samples. The linear regression model demonstrated excellent linearity between the peak area ratio of the target analytes with respect to 2-butanol (IS) versus their ...
In this study, proton NMR spectroscopy (200 MHz) was used for quantifying the content of ethyl esters in known mixtures of soybean oil and ethyl soyate (biodiesel). For this purpose, the peak areas of ester ethoxy and glycerol methylenic peaks in the region of 4.05–4.40 ppm were measured...
When low concentrations of water and ethanol were added in equal parts in the absence of lipid and nonpolar solvent, the NMR spectrum consisted of a combination of all water and ethanol peaks, except for the ethanol OH peak. Compared with pure water, the bulk water peak became broader and ...
The peak showed that the retention time of LA was 59 min. The EPK included 98.7 μg/mg of LA. Fig. 1 Effects of LA on adipogenesis in 3 T3-L1 preadipocytes. a Chemical structure of LA. b 3 T3-L1 preadipocytes were treated with various concentrations of LA during differentiation. On...
The previous paper on NMR spectrum of aged spirits demonstrated the formation of stable molecular clusters in which migration of ethanol molecules was restricted, and there was a decrease in monomeric ethanol, which produced a stimulative taste. In the present study, the thermal properties of ethanol...
RHE. No C2+ products are formed at this stage in Fig. 2c. Once applying the potential of −0.8 V vs. RHE, the intensity of the scattering peak extremely descended with an additional peak at ~2.4 Å. This is a typical scattering feature of the Cu–Cu bond. The conversion of...
DEAE, when compared with other amino alcohols, was observed to be biologically undecomposable in an experiment using activated sludge (HSDB 1988). Metabolism The absorption of DEAE (administered orally as DEAE acid malate or 'Cerebrol') in healthy adult rats is very rapid, reaching a peak plasm...
The peaks in the range of 2.41–2.84 eV are associated with the surface defects in the NiO-CeO2-and Ag-loaded NiO-CeO2 heterostructures. These peaks are induced by transitions from the level of the ionized OV to the EV [37], [38]. The peak at lower energies for the 0.5 ...
The experimental setup, device schematic and normalized deflection intensity at different concentrations are shown in Fig. 1. Each concentration was tested three times. After deconvolution of each spectrum, using a Voigt function, the average peak maxima for both anti and gauche conformers were ...
Crystallinity and structuring role of water in native and recrystallized starches by 13C CP-MAS NMR spectroscopy-1: Spectral decomposition Carbohydrate Polymers (1999) A.Pawlaket al. Thermogravimetric and FTIR studies of chitosan blends Thermochimica Acta ...