✦ LIBER ✦

Positive- and negative-ion matrix-assisted laser desorption/ionization mass spectrometry of saccharides

✍ Scribed by Chunyan Hao; Xiuli Ma; Shiping Fang; Zhiqiang Liu; Shuying Liu; Fengrui Song; Juzheng Liu

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 122 KB
Volume: 12
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19980415)12:7<345::aid-rcm165>3.0.co;2-b

No coin nor oath required. For personal study only.

✦ Synopsis

Matrix

-assisted laser desorption/ionization (MALDI) mass spectrometry (MS) of oligosaccharides and polysaccharides has been investigated in detail. It is demonstrated that cationized species of oligosaccharides, [MNa] and [MK] , are dominant products under the MALDI condition, and negative ions of oligosaccharides are not formed to any significant extent in this process. The molecular masses of polysaccharides are similarly determined by positive-and negative-ion MALDI-MS with the help of column chromatography. The distinction between positive-and negative-ion MALDI mass spectra of oligo-and polysaccharides indicates that the MALDI processes for saccharides vary with molecular mass. The matrix plays a more important role in the ionization process for oligosaccharides, while in the desorption process for polysaccharides.

📜 SIMILAR VOLUMES

Chemical reactivity in matrix-assisted l

Chemical reactivity in matrix-assisted laser desorption/ionization mass spectrometry

✍ C. Enjalbal; B. Sauvagnat; F. Lamaty; R. Lazaro; J. Martinez; P. Mouchet; F. Rou 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 139 KB 👁 1 views

During the control of a multistep organic synthesis on a soluble polymer (PEG) by matrix-assisted laser desorption/ionization (MALDI) mass spectrometry, a chemical reactivity was encountered when the matrix was acidic, for the samples where the amino moiety of the anchored compounds was protected as

Ionization mechanisms in matrix-assisted

Ionization mechanisms in matrix-assisted laser desorption/ionization mass spectrometry: contribution of pre-formed ions

✍ Edda Lehmann; Richard Knochenmuss; Renato Zenobi 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 316 KB 👁 2 views

The mechanisms of ion formation in matrix-assisted laser desorption/ionization mass spectrometry are still largely unknown. Ions may exist as pre-formed species in the solid state, or may form by ion-molecule reactions initiated by the laser shot, or, most probably, they may originate from a combina

Matrix-assisted Laser Desorption/Ionizat

Matrix-assisted Laser Desorption/Ionization Mass Spectrometry of Natural and Synthetic Lignin

✍ Paola Bocchini; Guido C. Galletti; R. Seraglia; P. Traldi; S. Camarero; A. T. Ma 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 375 KB 👁 2 views

Lignin is one of the components, with cellulose and hemicellulose, of cell walls in all terrestrial plants. Lignin is an amorphous, three-dimensional, polyphenolic molecule charged with the function of giving strength and impermeability to the plant structure. The determination of its molecular weig

Differentiation of enantiomers using mat

Differentiation of enantiomers using matrix-assisted laser desorption/ionization mass spectrometry

✍ M. P. So; T. S. M. Wan; T.-W. Dominic Chan 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 54 KB 👁 1 views

Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) has successfully been used to differentiate pseudo-enantiomeric (isotopically labelled) amino acids by using cyclodextrin as complexing host. By using different pseudo-enantiomeric mixtures (i.e. R Dn S; and R S Dn ), it has be

Matrix-assisted laser desorption/ionizat

Matrix-assisted laser desorption/ionization mass spectrometry of noncovalent protein-transition metal ion complexes

✍ Salih, Bekir; Masselon, Christophe; Zenobi, Renato 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 319 KB 👁 1 views

Transition metal ion complexes with proteins and peptides are important in many areas of analytical and biological chemistry. We used positive and negative ion MALDI-MS to detect complexes with Cu and Ni ions, and show that the speciÐc and non-speciÐc transition metal ion-peptide complexes can be di

Mass Spectrometry of Low Molecular Mass

Mass Spectrometry of Low Molecular Mass Solids by Matrix-assisted Laser Desorption/Ionization

✍ Goheen, Steven C.; Wahl, Karen L.; Campbell, James A.; Hess, Wayne P. 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 325 KB 👁 2 views

Matrix-assisted laser desorption/ionization combined with time-of-Ñight mass spectrometry (MALDI/TOF-MS) was used for the analysis of low molecular mass compounds. Three classes of molecules were studied : organic acids, salts of oxyanions and amine-based chelating compounds. Mass spectra from sampl