Also, the quantum chemical calculations using DFT (Density Function Theory) method were used to confirm the fragmentation process of the GC/MS chromatogram and the mass spectra of non-irradiated and irradiated PVA products. The HS-GC/MS analysis exhibited that fourth according to namely: 2-Butene...
The TGA-DTG results showed that 3PFM can decompose in three different periods with a total weight loss of 95 % and maximum decomposition in the range 405−510 °C, while the FTIR spectra and GC–MS analysis exhibited that – CH (aromatic and aliphatic) and 2,4-Dimethyl-1-heptene (...
便携式GC_MS在挥发性有机物应急监测中的应用_吕天峰
The reaction with a defined amount of exogenously provided hydrogen peroxide (H2O2) was used to determine H2O2scavenging activity that reflects the anti-oxidative capacity of the peel oil. Colorimetric analysis was used to estimate the residual H2O233. In brief, 20 µl of the sample was mixed ...
3.1. Analysis of biodegradable polymers of reference 3.1.1. EGA-MS The TITs and associated average mass spectra obtained for each type of virgin polymer and commercial product are shown in Table S1 in the Supplementary data. Starting with the virgin polymers, all TITs exhibited one main peak. ...
便携式GC_MS在挥发性有机物应急监测中的应用_吕天峰
In the GC-MS section, two common organic solvents (n-hexane and diethyl ether) were used to extract essential oils, and the mass spectra were recorded at 70eV (electron impact) and scanned in the range of 35450m/z. Compounds were identified using NIST (version 2017),...
Mass spectra and mass chromatograms have also been examined in order to assess the general structures present within the wide variety of degradation products. High-yield low molecular weight components include isomeric butenes (butene-1, butene-2, and 2-methyl-propene-1), but it is difficult ...
Fig. 3 shows FTIR spectra of the formulated compounds in different heating conditions. The analysis showed that the examined samples had similar functional groups even in changing heating conditions, particularly C–H (aliphatic) group at 2995 cm−1, CO (aldehyde or ketone) at 1740 cm−1, ...
The HPLC-ESI-MS spectra of this compound showed MS2 fragment ions at m/z 248 [C16H24O2]+, 203 [248-COOH]+, 207 [M-C16H27]+, 189 [207-H2O]+,and 175,which comprise the characteristic fragments for betulinic acid [23]. In the same manner, compound 8 (Rt, 29.68 min) showed a ...