Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

LC/UV chromatogram

Figure 7.23 (a) LC-UV chromatogram (275 nm) of a PVC sample extract (b) FTIR spectra of peaks. Legend (1) monoesterified... [Pg.494]

FIGURE 27 LC/UV chromatogram shows two late eluting peaks for the discolored tablets at retention time of 24.2 and 30.4 min. [Pg.556]

While identification of the peaks in a LC-UV chromatogram is possible by comparing retention times and UV spectra with authentic samples or a databank, this might not be possible for compounds with closely related structures, and wrong conclusions might be drawn. It has been established that in order to complete the characterization of phenolic compounds, reagents inducing a shift of the UV absorption maxima can be used. ... [Pg.17]

Figure 6.15 presents the LC-UV chromatogram of the hydrolysis products from the first step of simulated waste water treatment of Remazol Black 5 (RB5), a commercially important textile dye, while Figure 6.16 shows a series of stop-flow LC-NMR spectra acquired in an LC-NMR-MS run. The NMR and MS data of the tentatively identified compounds are shown in Tables 6.6 and 6.7, respectively. These are only by- or degradation products which elute earlier than the hydrolysed Remazol Black. Peaks which elute later consist of coeluting dye components which have not yet been identified. [Pg.168]

In the LC-UV chromatogram of the post-mortem plasma and urine extracts. [Pg.78]

Fig. 8. LC/UV chromatogram of G. ottonis with UV spectra and main FSP/LC-MS ions of the major constituents. HPLC Column, RP-18 NovaPak (4 im, 150 x 3.9 mm i.d.) gradient, CH3CN-H2O (0.05% TFA) 5 95 ->65 35 in 50 min (1.0 ml/min). UV spectra of 14 and 16 were characteristic for flavones, while those of 15 and 17-19 were indicative of xanthones and those of 5 of a secoiridoid glycoside. Fig. 8. LC/UV chromatogram of G. ottonis with UV spectra and main FSP/LC-MS ions of the major constituents. HPLC Column, RP-18 NovaPak (4 im, 150 x 3.9 mm i.d.) gradient, CH3CN-H2O (0.05% TFA) 5 95 ->65 35 in 50 min (1.0 ml/min). UV spectra of 14 and 16 were characteristic for flavones, while those of 15 and 17-19 were indicative of xanthones and those of 5 of a secoiridoid glycoside.
Fig. 9. LC/UV chromatogram of G. ottonis (vertical display) with the stop-flow LC/ H-NMR spectra of 5,16,17 and 19. On these LC/ H-NMR spectra, the coupling constants and the integration of the aromatic signals were easily measured. [Pg.253]

A first method simplified the classical analysis of the sum of free and esterified sterol instead of saponification and tedious extraction from a soap solution, the sample is transesterified at ambient temperature and the mixture (containing the fatty acids as methyl esters) is preseparated by NPLC. The LC-UV chromatogram enables one to select the type of sterols (A5, A7, methyl-, dimethyl sterols) to be analyzed by GC (after online transfer through the loop-type interface). [Pg.1877]

Figure 1 Perhaps the most complex LC-GC application used so far. LC-UV chromatogram from the second LC column (after isolation of the hydrocarbons on a large first LC column and eluent evaporation in a small online solvent evaporator) paraffins (with some carbon numbers indicated) and alkylated aromatics grouped by ring number. (Reproduced with permissbn from Moret etal. 1996.)... Figure 1 Perhaps the most complex LC-GC application used so far. LC-UV chromatogram from the second LC column (after isolation of the hydrocarbons on a large first LC column and eluent evaporation in a small online solvent evaporator) paraffins (with some carbon numbers indicated) and alkylated aromatics grouped by ring number. (Reproduced with permissbn from Moret etal. 1996.)...
Fig. 31 LC-UV chromatograms of thermally exposed PYX at 367 °C (A) and of shock-exposed PYX (B) [183] here the following intermediates are PA 2,4,6-trinitrophenol, PAM 2,4,6-trinitroanUine, DPA N-(2,4,6-trinitrophenyl)-2,4,6-trinitroaniline and DNBz 4,6-dinitrobenzofurazane... Fig. 31 LC-UV chromatograms of thermally exposed PYX at 367 °C (A) and of shock-exposed PYX (B) [183] here the following intermediates are PA 2,4,6-trinitrophenol, PAM 2,4,6-trinitroanUine, DPA N-(2,4,6-trinitrophenyl)-2,4,6-trinitroaniline and DNBz 4,6-dinitrobenzofurazane...
Fig. 12 Identification of 4-hydroxy-l-(3-pyridyl)-l-butanone (HPB) capillary LC-UV chromatogram (210-300 nm) of reaction mixture after 1 h. Electrolysis (-650 mV vs. SCE at 4 °C) of LbL films of cyt P450 2E1 and microsomal CPR on carbon cloth (2 cm ) in 2 mM NNK in O2 purged pH 7.0 + 0.1 M NaCl buffer. Reprinted with permission from the American Chemical Society, Ref. [71], Cop5uight 2011... Fig. 12 Identification of 4-hydroxy-l-(3-pyridyl)-l-butanone (HPB) capillary LC-UV chromatogram (210-300 nm) of reaction mixture after 1 h. Electrolysis (-650 mV vs. SCE at 4 °C) of LbL films of cyt P450 2E1 and microsomal CPR on carbon cloth (2 cm ) in 2 mM NNK in O2 purged pH 7.0 + 0.1 M NaCl buffer. Reprinted with permission from the American Chemical Society, Ref. [71], Cop5uight 2011...

See other pages where LC/UV chromatogram is mentioned: [Pg.425]    [Pg.370]    [Pg.372]    [Pg.524]    [Pg.524]    [Pg.19]    [Pg.150]    [Pg.85]    [Pg.3422]    [Pg.84]    [Pg.947]    [Pg.961]    [Pg.962]    [Pg.815]    [Pg.869]    [Pg.418]    [Pg.591]    [Pg.1878]    [Pg.1879]    [Pg.2912]    [Pg.355]    [Pg.256]   
See also in sourсe #XX -- [ Pg.524 ]




SEARCH



LC chromatogram

UV chromatogram

© 2024 chempedia.info