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Related Concept Videos

Experimental Determination of Chemical Formula02:37

Experimental Determination of Chemical Formula

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The elemental makeup of a compound defines its chemical identity, and chemical formulas are the most concise way of representing this elemental makeup. When a compound’s formula is unknown, measuring the mass of its constituent elements is often the first step in determining the formula experimentally.
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Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow
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CRB-FCC: A Standardized Nontargeted Analysis for Formula Assignment and Structure Annotation.

Ren-Qi Wang1, Yun Wang1, Min Wang1

  • 1School of Food and Biological Engineering, College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P. R. China.

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|October 20, 2025
PubMed
Summary
This summary is machine-generated.

The new Chromatographic Retention Behavior-Fragmental Chain Characterization (CRB-FCC) method accurately identifies unknown chemicals in complex samples. This approach overcomes limitations in mass spectral data quality and database availability for nontargeted analysis.

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Area of Science:

  • Analytical Chemistry
  • Chemical Analysis
  • Spectroscopy

Background:

  • Nontargeted analysis using LC-MS is crucial for identifying chemicals in real-world samples.
  • Resolving structures of unknown compounds from mass spectra is a significant challenge due to limited databases and poor spectral quality.
  • Existing methods often fail with low-quality or absent mass spectra.

Purpose of the Study:

  • To develop a robust method for identifying unknown chemicals in complex samples.
  • To overcome the limitations of traditional mass spectral matching in nontargeted analysis.
  • To improve the accuracy and reliability of chemical structure elucidation.

Main Methods:

  • Developed the Fragmental Chain Characterization (FCC) method for formula assignment from mass spectra.
  • Integrated FCC with the Chromatographic Retention Behavior (CRB) approach for compound identification across samples.
  • Validated the CRB-FCC method using 1,475 chemical standards and applied it to identify impurities in biosynthesized plastics.

Main Results:

  • The CRB-FCC method accurately annotates compounds even with poor quality or missing mass spectra.
  • Demonstrated consistent identification of compounds across samples using retention times and assigned formulas, despite spectral variations.
  • Successfully identified unknown yellow-hue impurities in biosynthesized plastics when combined with NMR.

Conclusions:

  • CRB-FCC offers a standardized protocol for data acquisition and interpretation in nontargeted analysis.
  • This method significantly improves the identification of unknown compounds compared to conventional techniques.
  • CRB-FCC is expected to accelerate the adoption of nontargeted analysis in academia and industry.