Method: Two indexes, common peak ratio and variation peak ratio, are used to compare the IR spectra of various Radix Glycyrrhizae samples, and the values are calculated by means of sequent analysis. 方法:利用 2个指标 :共有峰率 ,变异峰率 ,分别以各甘草样品的红外指纹图谱为标准 ,计算其他样品相...
Appendix 12. Important Peaks in the Mass Spectra of Common Solvents - Encyclopedia of Analytical Science (Second Edition)ELSEVIEREncyclopedia of Analytical Science
Piassava and Sponge gourd showed two separated peaks, revealing the more pronounced amounts of hemicellulose present at these fibers. All four fibers are, however, thermally stable up to temperatures of around 200°C. The activation energies for the thermal degradation of the fibers were similar,...
Principal component analysis of the IR spectra (obtained from the skin) showed that glucose was the first principal component [35]. Improvements in the configuration of the cell and its connection to a real, miniaturized portable instrument are still necessary [34]. 2.3 Non-invasive monitoring of...
Phosphorescence excitation and emission spectral peaks, lifetimes, working curves and limits of detection of 22 organic compounds of pharmacological importance in rigid (77掳K) ethanolic solution are given. Ethanol can be easily prepared... JD Winefordner,M Tin - 《Analytica Chimica Acta》 被引量...
Spectra were cut at the biochemical fingerprint region (1800–900 cm−1), processed with Savitzky-Golay second-order differentiation and vector-normalised. Asterisks denote significant differences (P < 0.05) at absorbance peaks following one-way ANOVA. (B) Two-dimensional scores plot ...
peaks already identified as biomarkers. The Student’s T-Test method was performed on the training dataset for both fingerprint and high regions of the spectra. The −log10 of the P-value of the T-test for each wavenumber was then plotted to identify the potential biomarkers from the T-...
Modern civilization depends on only a few plant species for its nourishment. These crops were derived via several thousands of years of human selection that transformed wild ancestors into high-yielding domesticated descendants. Among cultivated plants, common bean (Phaseolus vulgarisL.) is the most ...
Melt inclusions were analysed using a Thermo-Nicolet 6700 FTIR spectrometer coupled with an optical/IR Spectra-Tech microscope (IPGP, France). Water and carbon concentrations were calculated using the Beer-Lambert law (C(wt%) = 100 × A × M/(ε × ρ × e), where...
Spectra were cut at the biochemical fingerprint region (1800–900 cm−1), processed with Savitzky-Golay second-order differentiation and vector-normalised. Asterisks denote significant differences (P < 0.05) at absorbance peaks following one-way ANOVA. (B) Two-dimensional scores plot ...