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Related Concept Videos

Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
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Effective Value of a Periodic Waveform01:07

Effective Value of a Periodic Waveform

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The concept of effective value, the root mean square (RMS) value, is crucial in understanding electrical circuits and power delivery. This idea emerges from the necessity to measure the effectiveness of a voltage or current source in supplying power to a resistive load.
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Titration in Nonaqueous Solvents01:16

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Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
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Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Using Digital Waveforms to Mitigate Solvent Clustering During Mass Filter Analysis of Proteins.

Bojana Opačić1, Nathan M Hoffman1, Zachary P Gotlib1

  • 1Department of Chemistry, Washington State University, Pullman, WA, USA.

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|July 11, 2018
PubMed
Summary

Digitally driven mass filters enable analysis of high m/z ions. This study optimizes digital waveform parameters to minimize solvent adducts and improve spectral fidelity for multiply charged proteins.

Keywords:
Digital mass filterDigital waveform technologyProtein mass analysis

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Physical Chemistry

Background:

  • Advances in digital electronics enable purely digitally driven mass filters.
  • Traditional resonant systems have limitations in transmitting high m/z ions.
  • Digitally driven systems offer new mass analysis capabilities but face challenges with spectral fidelity.

Purpose of the Study:

  • To investigate optimal digital waveform operation for minimizing solvent adducts in mass spectrometry.
  • To enhance spectral fidelity when analyzing multiply charged protein species at high m/z ratios.
  • To explore the control offered by digital waveform frequency and duty cycle.

Main Methods:

  • Utilized a gentle atmospheric pressure interface for probing multiply charged protein species.
  • Employed digital waveform technology for ion filtering and manipulation.
  • Examined the impact of waveform frequency and duty cycle on ion clustering.

Main Results:

  • Digital waveform technology effectively minimizes solvent adducts and multimers.
  • Optimized digital waveform operation significantly improves spectral fidelity for high m/z ions.
  • Control over waveform duty cycle is crucial for minimizing unwanted ion clusters.

Conclusions:

  • Digitally driven mass filters provide a powerful alternative for analyzing complex biological molecules.
  • Optimizing digital waveform parameters is key to overcoming challenges in high m/z mass spectrometry.
  • This approach enhances the utility of mass spectrometry for protein analysis.