Amino Acid Quantification
Amino Acid Quantification - Related Videos
04:04
Radiolabeled Amino Acid Uptake Assay to Quantify Cellular Uptake of Amino Acids
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2025
This video demonstrates an in vitro technique for estimating amino acid uptake by bone marrow-derived stromal cells. Na+-dependent amino acid transporters mediate the uptake of radiolabeled amino acids inside the cells, and the cellular uptake is estimated by measuring the radioactivity.
03:49
Amino acids
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2026
Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...
09:28
One-step Metabolomics: Carbohydrates, Organic and Amino Acids Quantified in a Single Procedure
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Cited by 12 •
2010
The urease method of sample preparation for GC/MS analysis of intermediary metabolites is presented by its inventor. The method allows one-step follow-up of newborn screening for inborn errors by tandem mass spectrometry by quantifying carbohydrates, organic and amino acids all in a single process.
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Amino Acid Catabolism
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2025
Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
02:17
Proteins and Amino Acids
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2026
Proteins are chains of amino acids that are connected by peptide bonds and folded into a 3-dimensional structure. The side chains of individual amino acid residues determine the interactions among amino acid residues, and ultimately the folding of the protein. Depending on the length and structural complexity, chains of amino acid residues are classified as oligopeptides, polypeptides, or proteins.Amino Acid Residues Are the Building Blocks of ProteinsAn amino acid is a molecule that contains a...
FAQs
Hydrolysis breaks protein-containing material into released amino acids, making individual components available for analysis. This step is important when the research question concerns protein composition rather than only the intact sample. The resulting amino acid measurements can be interpreted alongside biological information about protein synthesis, degradation, or cellular function.
Calibration standards and curves connect an instrument’s measured signal with amino acid concentration. A sample result is interpreted by comparing its optical or mass spectrometric response with those reference measurements. This approach turns detection data into concentration estimates, allowing profiles from cells, tissues, foods, or pharmaceutical products to be compared in a consistent analytical framework.
Chromatographic separation and detection answer different analytical needs. Liquid chromatography or ion exchange chromatography distinguishes amino acids before measurement, while optical detection or mass spectrometry supplies the signal used for quantification. Selecting among these combinations changes how the sample is analyzed, but each route supports measurement of individual amino acids rather than only a total amino acid amount.
In a typical workflow, researchers prepare the biological sample, hydrolyze it when amino acids must be released from proteins, separate the resulting components by chromatography, and detect them through an optical signal or mass spectrometry. They then use standards or a calibration curve to calculate concentrations and assemble an amino acid profile.
Biologists can use these measurements to examine protein synthesis and degradation, characterize cells and tissues, and track metabolic changes. Comparing amino acid concentrations across samples may reveal differences in cellular function or pathway activity. The value lies not only in measuring abundance, but also in connecting the profile to processes occurring within a biological system.
Outside basic cell studies, amino acid profiles support disease research and evaluation of food and pharmaceutical products. In disease-focused work, an abnormal profile can reveal altered metabolism or pathway activity. In product analysis, the same quantitative information helps evaluate composition, extending the method from experimental biology to applied nutritional and pharmaceutical research.