The complexation of the elements P,S,Cr,Ni,Cu,Zn,Fe,Hg,Pb,Cd and As with different molecular size fractions of dissolved organic matter in one river water sample and two sea water samples were investigated by coupling...
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The complexation of the elements P,S,Cr,Ni,Cu,Zn,Fe,Hg,Pb,Cd and As with different molecular size fractions of dissolved organic matter in one river water sample and two sea water samples were investigated by coupling size-exclusion chromatography sequentially with UV-Vis and inductively coupled plasma mass spectrometric *** can provide quantitative information regarding the distribution of both DOM and its element-bound complexes. This information would be helpful in understanding of the speciation,mobility and bio-accessibility of elements in the environment and further elucidation of the dissolved organic matter structure.
To develop a HPLC-DAD-ESI-TOF/MS analysis method for the determination of gentiopicroside and loganic acid in Radix gentianae samples and for the research of their *** samples were extracted using ASE for 10 min under...
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To develop a HPLC-DAD-ESI-TOF/MS analysis method for the determination of gentiopicroside and loganic acid in Radix gentianae samples and for the research of their *** samples were extracted using ASE for 10 min under 100 ℃ and 9.65 MPa,and divided into water phase and chloroform phase and analyzed them with HPLC-DAD-ESI-TOF/MS method *** on this method,the HPLC fingerprints of Radix gentianae were *** the spectrogram and mass spectrum of the chromatogram peak with the reference value,three compounds in water phase were identified as gentiopicroside,asafetida acid and loganic *** is no report of the compounds in chloroform *** content of gentiopicroside and loganic acid in samples of different groups were determined,*** fingerprints were compared by the software of the similarity evaluation system for chromatographic *** water phase fingerprint congruence coefficients of samples from six different areas were above 0.90,however,the chloroform phase fingerprint congruence coefficients were within *** method can be used for determination of potent component in Radix gentianae and its quality *** gentianae from different producing areas have the largest diversities,and the diversities embodied in the content of chloroform phase compounds.
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