The pure, isolated compounds (25.0 and 35.0 mg of 1 and 2, respectively) were analyzed in a Bruker ARX500 instrument: 1H NMR at 500 MHz and 13C NMR at 125 MHz. The samples were dissolved in DMSO-d6. LC–ESI-MS analyses were performed using an Esquire 3000 Plus (Bruker Daltonics)....
which corresponds to an addition of 86 Da to the molecular weight of peak S40. Similar to the MS pattern of Q3(6Mal)Glu (peak F14), the characteristic ions were observed atm/z944[M + H-MalGlu]+and 231[MalGlu + H-H2O]+. Therefore, peak S51 was tentatively identified as ...
In the FT-IR spectra, the –C=O peak at around 1650 cm−1 represented the oxidation of phenol to quinone. After 4 weeks, the –C=O peak was negligible for P3HS, but observable for P4HS and P5HS (Supplementary Fig. 26). Similarly, phenolics have specific UV–Vis adsorption ...
which corresponds to an addition of 86 Da to the molecular weight of peak S40. Similar to the MS pattern of Q3(6Mal)Glu (peak F14), the characteristic ions were observed atm/z944[M + H-MalGlu]+and 231[MalGlu + H-H2O]+. Therefore, peak S51 was tentatively identified as ...
The extract was infused into the HPLC machine to get a curve with peak area and retention time in a chromatogram. The peak area was subsequently used in comparison with that of standard relative to the concentration of the standard to get the concentration of the samples. Statistical analysis ...
The formation of hydroperoxide functions can be observed in 1H NMR spectrum by the presence of a broad peak around 11.5 ppm. The broad peak indicates the formation of many regioisomers and diastereoisomers as could be expected for cardanol derivatives. Finally, the mixture of β-hydroxy ...
198C. Serafinet al.· Active Principles fromP. glomerataTable I.13C NMR data for compounds1(in CDCl3),2(in DMSO-d6) and3(in CDCl3/DMSO-d6).C2131111.2a111.9a112.8a2141.2b140.8b141.5b3140.5b152.4153.04153.2c134.1134.55107.7147.7147.86111.2a98.198.17158.7d161.6161.91112.7a113.6a113.7a2141.7...
Therefore, when the irradia- tion time increases, the phenolic resin becomes better cross-linked as demonstrated by 13C and 1H NMR (Fig. 5) and DSC (Figure S4a). In the same time the H-bonding interactions are reduced as demonstrated by TGA results. Less OH or –COOH groups are ...
13C NMR spectrum of 3 in CDCl3. acetyl groups of 1 or that between an acetyl group of 1 and formaldehyde. However, no peak corresponding to an , - unsaturated ketone moiety that resulting from the above mentioned aldol condensation was detected in the FT-IR spectrum of 3; in addition, ...
13C solid state CP/MAS NMR spectrum (Fig. 1b) of NH2-MPR revealed two strong peaks at 152 ppm and 126 ppm, respectively. The peak at 152 ppm corresponded to all C1 carbons with a hydroxyl group while the peak at 126 ppm was attributed to amine-substituted aromatic ...