Table of Contents

  • Notices and Trademarks
  • Open this section 1. Introduction
    • Open this section 1.1. Installing Chenomx NMR Suite
      • Windows (64-bit)
      • Windows (32-bit)
      • Mac OS X
      • Linux (64-bit)
      • Linux (32-bit)
    • 1.2. Running Chenomx NMR Suite
    • 1.3. Software Updates
    • 1.4. Tutorial and Sample Files
  • Open this section 2. Handling Samples and Spectra
    • Open this section 2.1. Sample Preparation
      • Preparing Filter Tubes for Sample Filtration
      • Filtering the Sample through Microcentrifuge Filter Tube
      • Internal Standard Solution
    • Open this section 2.2. Spectral Data Acquisition
      • Pulse Sequences
      • Required NMR Parameters
    • Open this section 2.3. Spectral Data Processing
      • Data Processed with Other Software
  • Open this section 3. Common Tasks
    • 3.1. Processing a Spectrum
    • 3.2. Profiling a Spectrum
    • 3.3. Identifying Compounds
    • 3.4. Profiling Overlapped Regions in a Spectrum
    • 3.5. Determining Compound Concentrations
  • Open this section 4. The Basics
    • 4.1. Opening Files
    • 4.2. Importing Spectra
    • 4.3. Saving Files
    • 4.4. Closing Files
    • 4.5. Exiting Modules
    • 4.6. Undo and Redo
    • 4.7. Change Columns
    • Open this section 4.8. Sidebar
      • Legend
      • Files
      • Reference Cards
      • Spectrum Details
      • Processing History
      • Compound Sets
      • Simulation
    • 4.9. Spectrum Overlays
    • Open this section 4.10. Spectrum Graph Tools
      • Show Entire Spectrum
      • Set Zoom
      • Undo/Redo Zoom
      • Auto Zoom
      • Increase/Decrease Vertical Zoom
      • Increase/Decrease Horizontal Zoom
      • Spectrum Graph
      • Spectrum Thumbnail
      • Select Region
    • 4.11. Export Spectrum Image
    • 4.12. Copy Spectrum Image to Clipboard
    • 4.13. Display Options
    • 4.14. Preferences
  • Open this section 5. Processor
    • 5.1. Overview
    • Open this section 5.2. Processing Tools
      • Line Broadening
      • Phase Correction
      • Baseline Correction
      • Shim Correction
      • Region Deletion
      • Reverse Spectrum
      • Batch Process
    • Open this section 5.3. Calibration Tools
      • Calibrate CSI
      • Define Custom CSI
      • Calibrate pH
      • Calibration Tool
    • Open this section 5.4. Information Tools
      • Spectrum Details (Sidebar)
      • Processing History (Sidebar)
    • Open this section 5.5. Importing and Exporting Data
      • Batch Import
      • Send to Profiler
      • Export as JCAMP-DX
  • Open this section 6. Profiler
    • 6.1. Overview
    • Open this section 6.2. Profiling Tools
      • Compound Table
      • Custom Colors
      • Pinned Compounds
      • Starred Compounds
      • Remember Selection
      • Quick Searches
      • Concentrations and Compound Fits
      • Fit Automatically
      • Concentration Fitting and Optimization Tool
      • Enforce Transform Windows
      • Scale Concentrations
      • Batch Edit
      • pH Tool
      • Compound Snapper
      • Batch Fit
    • 6.3. Cluster Navigator
    • Open this section 6.4. Compound Set Tools
      • Compound Sets (Sidebar)
    • Open this section 6.5. Importing and Exporting Data
      • Batch Export
      • Export Compound Table
      • Export Profiled Compounds
      • Import Profile
      • Send to Processor
    • 6.6. Spectral Binning
    • Open this section 6.7. Information Tools
      • Legend (Sidebar)
      • Reference Card Panel (Sidebar)
      • Spectrum Details (Sidebar)
      • Concentration Units
  • Open this section 7. Spin Simulator
    • 7.1. Overview
    • Open this section 7.2. Simulating Tools
      • New Simulation
      • Spin Systems
      • Spin Definitions
      • Spin Navigator
      • J-Modifiers
    • Open this section 7.3. Information Tools
      • Spin Definition (Sidebar)
      • Simulation Details
  • Open this section 8. Compound Builder
    • 8.1. Overview
    • Open this section 8.2. Building Tools
      • New Compound
      • Import Simulation
      • Adding Peaks
      • Selecting Peaks and Clusters
      • Delete Selected Peaks
      • Adjusting Peaks
      • Grouping Peaks as a Cluster
      • Optimize Selected Peak Shapes
      • Generate Cluster for Region
      • Transform Windows
      • pH Sensitivities
      • Manage Cluster IDs
      • Cluster Navigator
    • Open this section 8.3. Information Tools
      • Reference Card Panel (Sidebar)
      • Compound Details
      • Information Panel
    • 8.4. Compound Fit Style
  • Open this section 9. Library Manager
    • 9.1. Overview
    • Open this section 9.2. Library Tools
      • Compound Table
      • Quick Searches
      • Add Compounds
      • Export Compounds
      • Send to Compound Builder
      • Remove Compounds
      • Update Compounds
    • Open this section 9.3. Compound Set Tools
      • Compound Sets (Sidebar)
      • Automatic Compound Sets
      • Compound Sets
      • Smart Compound Sets
      • Rename Compound Sets
      • Remove Compound Sets
    • Open this section 9.4. Reference Card Editor
      • Required Details
      • Optional Details
    • Open this section 9.5. Information Tools
      • Reference Card Panel (Sidebar)
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3.5 Determining Compound Concentrations

Once you have identified compounds present in a sample, you need to determine their concentrations based on the data in the spectrum. If you have automatically fit a compound, you may need to refine the suggested concentration.

For more details on techniques for determining optimal profiles for compounds in experimental spectra, see “Tutorial and Sample Files”.

Note that it is not possible to determine (or adjust) the concentrations of compounds that make use of the region-based fit style. For those compounds, you must perform your analysis using compound Areas instead. See “Compound Fit Style” for more details.

To determine the concentration of a compound

  1. If the subtraction line (green) is not currently visible, turn it on (see “Legend”).

  2. Set a concentration for the compound so that you can see the clusters clearly (see “Concentrations and Compound Fits”).

  3. Use the Cluster Navigator to locate a cluster that you can use to approximate the compound concentration (see “Cluster Navigator”).

    When choosing a cluster with which to establish a compound's concentration, use a cluster that overlaps other clusters as little as possible.

  4. Click and drag the height control for the compound and observe the subtraction line. Adjust the height of the compound until the subtraction line under the cluster approximates a normal spectrum. You may need to move the cluster from side to side somewhat to properly adjust the subtraction line (see “Tutorial and Sample Files”).

  5. If any of the clusters for the current compound overlap with compounds that you have already profiled, you may need to readjust those compounds.

  6. Compound concentrations are shown in the Compound Table (see “Compound Table”).


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Last modified: 30 Jun 2021