An Orbital Trap Mass Analyzer Using a Hybrid Magnetic-Electric Field: A Simulation Study.

An orbital ion trap mass analyzer employing hybrid magnetic-electric field was designed and simulated. The trap has a rotational symmetrical structure and the hybrid trapping field was created in a toroidal space between 12 pairs of sector detection electrodes. Ion injection and ion orbital motion inside the trap were simulated using SIMION 8.

Exploring halide anion affinities to native cyclodextrins by mass spectrometry and molecular modelling.

The binding affinities of cyclodextrins complexation with chlorine (Cl), bromine (Br) and iodine (I), were measured by mass spectrometric titrimetry, and the fitting of the binding constants was based on the concentration measurement of the cyclodextrin equilibrium. The binding constants (lg K) for α-, β- or γ-cyclodextrin with Cl were 3.99, 4.

Poly (methacrylic acid-co-diethenyl-benzene) monolithic microextraction column and its application to simultaneous enrichment and analysis of mycotoxins.

A poly (methacrylic acid-co-divinyl-benzene) [poly (MAA-co-DVB)] monolithic column was specially prepared according to the chemical structures of the three mycotoxins of aflatoxin B1, zearalenone and sterigmatocystin, and used for in-tube solid-phase microextraction (in-tube SPME) of the selected mycotoxins. The poly (MAA-co-DVB) monolithic column was characterized in detail, and exhibited effective hydrophobic, π-π, and hydrogen bonding interactions towards the target analytes. By coupling the poly (MAA-co-DVB) monolithic column-based in-tube SPME with high-performance liquid chromatography, a simple, sensitive and matrix effect-free method for determination of mycotoxins was developed.

Simulation of the simultaneous dual-frequency resonance excitation of ions in a linear ion trap.

The process of ion resonance dipolar excitation in a linear ion trap by 2 ejection waveforms with close frequencies is studied. The physical mechanism of increasing the resolving power using the ion excitation is a nonlinearity of the electric radio frequency fields caused by space charge. Using 2 resonance forces with 2 close frequencies leads to the completion of 2 excitation processes.

Enhancement of Ion Activation and Collision-Induced Dissociation by Simultaneous Dipolar Excitation of Ions in x- and y-Directions in a Linear Ion Trap.

Collision-induced dissociation (CID) in linear ion traps is usually performed by applying a dipolar alternating current (AC) signal to one pair of electrodes, which results in ion excitation mainly in one direction. In this paper, we report simulation and experimental studies of the ion excitation in two coordinate directions by applying identical dipolar AC signals to two pairs of electrodes simultaneously. Theoretical analysis and simulation results demonstrate that the ion kinetic energy is higher than that using the conventional CID method.

Novel linear ion trap mass analyzer built with triangular electrodes.

A novel linear ion trap mass analyzer built with four triangular electrodes, the triangular-electrode linear ion trap (TeLIT), has been built and its performance has been characterized. The TeLIT has all the properties of a conventional LIT mass analyzer, performing ion trapping, mass analysis, and tandem mass spectrometry functions. The TeLIT was constructed with four identical triangular cross-section shaped electrodes and two planar electrodes.

Multiple mass analysis using an ion trap array (ITA) mass analyzer.

A novel ion trap array (ITA) mass analyzer with six ion trapping and analyzing channels was investigated. It is capable of analyzing multiple samples simultaneously. The ITA was built with several planar electrodes made of stainless steel and 12 identical parallel zirconia ceramic substrates plated with conductive metal layers.