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Urea Cycle01:23

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The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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Fast and Accurate Exhaled Breath Ammonia Measurement
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A morphological method for ammonia detection in liver.

Virginia Gutiérrez-de-Juan1, Sergio López de Davalillo1, David Fernández-Ramos1

  • 1CIC bioGUNE (Center for Cooperative Research in Biosciences), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Derio, Bizkaia, Spain.

Plos One
|March 21, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a new, inexpensive method to detect ammonia in liver tissue. This technique can help assess liver disease severity and potentially predict patient outcomes in hyperammonemia cases.

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Area of Science:

  • Biochemistry
  • Pathology
  • Medical Diagnostics

Background:

  • Hyperammonemia, elevated ammonia levels, is common in liver injury and disease.
  • Current methods for detecting liver ammonia accumulation are lacking for clinical use.
  • Hepatic ammonia levels may predict patient outcomes.

Purpose of the Study:

  • To develop an easy, inexpensive, and accurate method for detecting ammonia in biological tissues.
  • To validate the developed method against existing commercial kits.
  • To assess the correlation between detected ammonia levels and liver disease severity.

Main Methods:

  • Development of a morphological method using Nessler's reagent for ammonia detection.
  • Validation of the method using mouse tissue samples and comparison with a commercial kit.
  • Application of the method to clinical and animal models of liver injury and fatty liver disease.

Main Results:

  • The developed morphological method accurately and precisely detects ammonia accumulation in biological tissue.
  • The method shows good correlation with a commercially available kit.
  • Hepatic ammonia accumulation was confirmed in various models of acute and chronic liver injury, including fatty liver disease progression.

Conclusions:

  • A novel, cost-effective morphological method for detecting liver ammonia has been developed.
  • This method accurately quantifies ammonia levels, correlating with liver disease severity.
  • The technique holds potential for predicting patient outcomes in hyperammonemia and liver disease.