A dual electrospray ionization source combined with hexapole accumulation to achieve high mass accuracy of biopolymers in fourier transform ion cyclotron resonance mass spectrometry

A dual electrospray ionization (ESI) source employed with hexapole accumulation and gated trapping provides a novel method of using an internal standard to achieve high mass accuracies in Fourier transform ion cyclotron resonance mass spectrometry. Two ESI emitters are sequentially positioned in fro...

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Veröffentlicht in:Journal of the American Society for Mass Spectrometry 2000-10, Vol.11 (10), p.876-883
Hauptverfasser: Hannis, James C, Muddiman, David C
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description A dual electrospray ionization (ESI) source employed with hexapole accumulation and gated trapping provides a novel method of using an internal standard to achieve high mass accuracies in Fourier transform ion cyclotron resonance mass spectrometry. Two ESI emitters are sequentially positioned in front of the heated metal capillary inlet by a solenoid fitted to an XYZ micromanipulator; one emitter contains the analyte(s) of interest and the other an internal standard. A 5 V transistor–transistor logic pulse from the data station controls the solenoid by means of a solid-state relay so that matching of spectral peak intensities (i.e., analyte and internal standard intensities) can be accomplished by adjusting the hexapole accumulation time for each species. Polythymidine, d(pT) 18, was used as the internal standard for all studies reported here. The absolute average error for an internally calibrated 15-mer oligonucleotide (theoretical monoisotopic mass = 4548.769 Da) was −1.1 ppm (external calibration: 41 ppm) with a standard deviation of ±3.0 ppm (external calibration: ±24 ppm) for a total of 25 spectra obtained at various hexapole accumulation time ratios. Linear least squares regression analysis was carried out and revealed a linear dependence of the magnitudes of the peak height ratios (analyte/internal standard) vs. hexapole accumulation time ratios (analyte/internal standard) which is described by the following equation: y = 0.45 x −0.02. The fitted line had a %RSD of the slope of 28% with an R 2 of 0.93. The applicability of this methodology was extended to a polymerase chain reaction product with a theoretical average molecular mass of 50,849.20 Da. With the internal standard, d(pT) 18, an absolute average error of −8.9 ppm (external calibration: 44 ppm) based on five measurements was achieved with a standard deviation of 11 ppm (external calibration: ±36 ppm), thus illustrating this method’s use for characterizing large biomolecules such as those encountered in genomics and proteomics related research.
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Two ESI emitters are sequentially positioned in front of the heated metal capillary inlet by a solenoid fitted to an XYZ micromanipulator; one emitter contains the analyte(s) of interest and the other an internal standard. A 5 V transistor–transistor logic pulse from the data station controls the solenoid by means of a solid-state relay so that matching of spectral peak intensities (i.e., analyte and internal standard intensities) can be accomplished by adjusting the hexapole accumulation time for each species. Polythymidine, d(pT) 18, was used as the internal standard for all studies reported here. The absolute average error for an internally calibrated 15-mer oligonucleotide (theoretical monoisotopic mass = 4548.769 Da) was −1.1 ppm (external calibration: 41 ppm) with a standard deviation of ±3.0 ppm (external calibration: ±24 ppm) for a total of 25 spectra obtained at various hexapole accumulation time ratios. Linear least squares regression analysis was carried out and revealed a linear dependence of the magnitudes of the peak height ratios (analyte/internal standard) vs. hexapole accumulation time ratios (analyte/internal standard) which is described by the following equation: y = 0.45 x −0.02. The fitted line had a %RSD of the slope of 28% with an R 2 of 0.93. The applicability of this methodology was extended to a polymerase chain reaction product with a theoretical average molecular mass of 50,849.20 Da. With the internal standard, d(pT) 18, an absolute average error of −8.9 ppm (external calibration: 44 ppm) based on five measurements was achieved with a standard deviation of 11 ppm (external calibration: ±36 ppm), thus illustrating this method’s use for characterizing large biomolecules such as those encountered in genomics and proteomics related research.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><pmid>11014449</pmid><doi>10.1016/S1044-0305(00)00160-4</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; Springer Nature - Complete Springer Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry
subjects Accumulation
Biological and medical sciences
Biomolecules
Biopolymers
Biopolymers - chemistry
Calibration
Cyclotron resonance
Cyclotrons
Diverse techniques
Electrospraying
Emitters
Fourier Analysis
Fourier transforms
Fundamental and applied biological sciences. Psychology
Ionization
Ions
Mass Spectrometry
Molecular and cellular biology
Polymerase chain reaction
Proteomics
Regression analysis
Reverse Transcriptase Polymerase Chain Reaction
Scientific imaging
Spectrophotometry, Ultraviolet
Spectroscopy
Standard deviation
Transistor logic
Transistors
title A dual electrospray ionization source combined with hexapole accumulation to achieve high mass accuracy of biopolymers in fourier transform ion cyclotron resonance mass spectrometry
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