✦ LIBER ✦

Effect of combined changes in delayed extraction time and potential gradient on the mass resolution and ion discrimination in the analysis of polydisperse polymers and polymer blends by delayed extraction matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

✍ Scribed by Daniele Vitalini; Placido Mineo; Emilio Scamporrino

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 169 KB
Volume: 13
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19991230)13:24<2511::aid-rcm819>3.0.co;2-y

No coin nor oath required. For personal study only.

✦ Synopsis

Data reported here show that, in the delayed extraction matrix-assisted laser desorption/ionization time-offlight (DE-MALDI-TOF) mass spectrometric analysis of synthetic polydisperse polymers, different experimental conditions of spectral recording are required to optimize the signal in all the m/z regions of the spectrum. The effect of combined changes in delay time and grid voltage % values on both mass resolution and mass accuracy of DE spectra of a polyethylene glycol sample (PEG mix , with a well-defined molar distribution of its components) is discussed. The necessity of a compromise between the values of these two parameters is shown. Furthermore, the occurrence of analyte discrimination, which can invalidate the composition analysis especially in the case of polymer blends, is demonstrated.

📜 SIMILAR VOLUMES

Time-delayed extraction matrix-assisted

Time-delayed extraction matrix-assisted laser desorption/ionization time-of-flight mass spectrometry of polyacrylnitrile and other synthetic polymers with the matrix4-hydroxybenzylidene malononitrile

✍ Katharina Linnemayr; Philipp Vana; Günter Allmaier 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 200 KB 👁 2 views

Matrix selection and sample preparation technique, namely finding a suitable matrix-analyte combination, has been one of the most important concerns in applying positive and negative ion matrix-assisted laser desorption/ionization (MALDI) mass spectrometry to synthetic polymers. Most matrices used i

Improved resolution in the detection of

Improved resolution in the detection of oligonucleotides up to 60-mers in matrix-assisted laser desorption/ionization time-of-flight mass spectrometry using pulsed–delayed extraction with a simple high voltage transistor switch

✍ Yongdong Zhu; Ling He; Jannavi R. Srinivasan; David M. Lubman 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 232 KB 👁 1 views

Pulsed-delayed extraction using a simple high voltage transistor switch together with various sample purification approaches were used to enhance the resolution in matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) of oligonucleotides up to 60 bases long. This

Influence of acceleration voltages on re

Influence of acceleration voltages on relative ion intensities in the post-source decay fragmentation of isomeric cyclic oligosaccharides by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

✍ Tohru Yamagaki; Hiroshi Nakanishi 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 81 KB 👁 2 views

The isomeric sugar-branched cyclodextrin (CD) derivatives of 6-O-glucosyl-betaCD (G1-betaCD) and 6,6-di-O-glucosyl-alphaCD (G1, G1-alphaCD) were analyzed by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry at the different acceleration voltages of 20 and 8 kV.