The molecular weight and molecular weight distribution greatly affect the properties of a polymer Classical polymer weight determination methods involve typically indirect methods, such as gel permeation chromatograph...The molecular weight and molecular weight distribution greatly affect the properties of a polymer Classical polymer weight determination methods involve typically indirect methods, such as gel permeation chromatography(GPC), and light scattering .However, these methods are time-consuming and can not provide absolute molecular weight .MALDI/TOF has the ability to directly measure absolute molecular weight of polymer and molecular weight distribution. Besides average molecular weight, MALDI-TOF can provide information about the repeat unit and end group of the polymer. We analyzed several synthetic polymers by MALDI/TOF .Their average molecular weights were calculated and their molecular structures were proposed.展开更多
Five Peptide Sequences were analysed and two kinds of peptide mixture system were identified by Electtospray Ionization Fourier Transform ion Cyclotron Resonance Mass spectrometry. The results provide important inform...Five Peptide Sequences were analysed and two kinds of peptide mixture system were identified by Electtospray Ionization Fourier Transform ion Cyclotron Resonance Mass spectrometry. The results provide important information in The field of peptide combinatorial chemistry research.展开更多
文摘The molecular weight and molecular weight distribution greatly affect the properties of a polymer Classical polymer weight determination methods involve typically indirect methods, such as gel permeation chromatography(GPC), and light scattering .However, these methods are time-consuming and can not provide absolute molecular weight .MALDI/TOF has the ability to directly measure absolute molecular weight of polymer and molecular weight distribution. Besides average molecular weight, MALDI-TOF can provide information about the repeat unit and end group of the polymer. We analyzed several synthetic polymers by MALDI/TOF .Their average molecular weights were calculated and their molecular structures were proposed.
文摘Five Peptide Sequences were analysed and two kinds of peptide mixture system were identified by Electtospray Ionization Fourier Transform ion Cyclotron Resonance Mass spectrometry. The results provide important information in The field of peptide combinatorial chemistry research.
