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Related Concept Videos

Drug Concentrations: Measurements01:23

Drug Concentrations: Measurements

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Drug concentration is the quantity of a drug present in a biological sample. Measuring drug amounts in biological samples allows the clinician to understand how a drug is absorbed, distributed, metabolized, and excreted. Samples can be obtained through invasive or non-invasive methods. Invasive techniques involve surgical or parenteral interventions to gather blood, cerebrospinal fluid, or tissue biopsy. Conversely, non-invasive approaches provide samples like urine, feces, and saliva.
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Sampling Methods: Sample Types01:18

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Sampling materials are classified into three main types: solid, liquid, and gas.
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The absolute value is a mathematical tool that represents the distance of a number from zero on the number line, regardless of its sign. In the context of inequalities, absolute value expressions help define a range of permissible values or boundaries for a variable. These inequalities are commonly used in scientific modeling and data interpretation, where variability within or beyond a certain threshold must be captured precisely.An absolute value inequality of the form ∣x∣ ≤...
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Mean Absolute Deviation01:13

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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
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Convenience Sampling Method00:55

Convenience Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population.
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Related Experiment Video

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Absolute Quantum Yield Measurement of Powder Samples
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An Improved Method for Measuring Absolute Metabolite Concentrations in Small Biofluid or Tissue Samples.

Tharindu Fernando1, Annick Sawala1, Andrew P Bailey1

  • 1Physiology and Metabolism Laboratory , The Francis Crick Institute , 1 Midland Road , London NW1 1AT , U.K.

Journal of Proteome Research
|February 14, 2019
PubMed
Summary

Accurately measuring metabolite concentrations in small biological samples is challenging. A new paired method (pVDTS) improves precision for biofluids and tissues, outperforming previous techniques.

Keywords:
Drosophila melanogasterbiofluidhemolymphlarvametabolitesmetabolomicsnuclear magnetic resonance spectroscopysex-specificsmall volumetissue

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A Simple Fractionated Extraction Method for the Comprehensive Analysis of Metabolites, Lipids, and Proteins from a Single Sample
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Area of Science:

  • Metabolomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Accurate absolute metabolite quantification in small biological samples is difficult.
  • Existing methods like normalization to total signal can be less accurate.
  • Previous work introduced volume determination with two standards (VDTS) for biofluids.

Purpose of the Study:

  • To introduce paired VDTS (pVDTS), an enhanced method for metabolite quantification.
  • To improve accuracy and precision in small biofluid and solid tissue samples.
  • To address dilution errors in solid tissue samples.

Main Methods:

  • Development of paired VDTS (pVDTS) with new equations.
  • Application of pVDTS to NMR spectra of Drosophila melanogaster larvae.
  • Inclusion of a surface wetness correction for solid samples.

Main Results:

  • pVDTS provides more precise and logically consistent metabolite concentration data than original VDTS.
  • The method demonstrated improved accuracy in fed versus starved Drosophila larvae.
  • pVDTS accounts for dilution errors from variable surface wetness in solid tissues.

Conclusions:

  • pVDTS is a refined workflow for accurate absolute metabolite concentration measurement.
  • The method is applicable to a broad range of biofluids and solid tissues.
  • pVDTS enhances the reliability of metabolomic studies using small sample volumes.