Retinol Isotope Quantification
Retinol Isotope Quantification - Related Videos
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Real-time Analyses of Retinol Transport by the Membrane Receptor of Plasma Retinol Binding Protein
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Here we describe an optimized technique to produce high-quality vitamin A/RBP complex and two real-time monitoring techniques to study vitamin A transport by STRA6, the RBP receptor.
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Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids (BPCA)
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We present the benzene polycarboxylic acid (BPCA) method for assessing pyrogenic carbon (PyC) in the environment. The compound-specific approach uniquely provides simultaneous information about the characteristics, quantity and isotopic composition (13C and 14C) of PyC.
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Formulation of Vitamin A Tracer Doses for Administration to Human Subjects using Retinol Isotope Dilution Technique
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2026
The preparation of stable isotope-labeled vitamin A, necessary for the retinol isotope dilution technique, needs to conform to food safety standards. The protocol shows dosage preparation in vegetable oil at concentrations that will be suitable for the chosen delivery system and the applied analytical platform.
02:31
Elements: Chemical Symbols and Isotopes
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2020
A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain). Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
01:12
Isotopes
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2026
Elements have a set number of protons that determines their atomic number (Z). For example, all atoms with eight protons are oxygen; however, the number of neutrons can vary for atoms of the same element. The sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are called isotopes. Elements can have multiple isotopes, for example, carbon-12, carbon-13, and carbon-14.An element's atomic mass, or weight, is a...
FAQs
Mass spectrometry distinguishes retinol isotopologues by their characteristic mass differences, allowing labeled tracer-derived molecules to be separated from other retinol forms. An internal standard provides a reference for the measurement, helping relate instrument responses to retinol quantities. This combination is central to detecting isotope-specific signals rather than treating all retinol as indistinguishable.
The labeled retinol tracer functions as a defined reference within the isotope-dilution measurement. By evaluating tracer-associated and corresponding retinol signals relative to an internal standard, investigators can estimate retinol concentration while retaining information about isotope identity. This supports quantitative comparisons across biochemical samples and helps distinguish total amount from tracer distribution.
Following the labeled tracer can provide information about several linked stages of vitamin A handling, including absorption, transport, conversion, and turnover. Measuring isotope-specific retinol signals allows these processes to be examined quantitatively rather than inferred only from a single concentration measurement. In biochemistry, this helps connect retinoid levels with metabolic regulation and homeostasis.
The essential elements are a stable-isotope-labeled retinol tracer, an internal standard, isotope-dilution analysis, and mass spectrometric measurement. Together, these components provide both a quantitative reference and isotope-specific detection. The mass spectrometer separates and measures retinol forms according to their characteristic mass differences, producing data suitable for assessing concentration and metabolic behavior.
Retinol isotope quantification can be applied to cells, tissues, and other biological samples in which vitamin A metabolism is being studied. The selected sample type depends on the biochemical system and the process of interest, such as transport, conversion, or turnover. Measuring isotope-specific retinol signals in these materials supports direct investigation of retinoid handling.
This approach is useful when researchers need quantitative information about vitamin A kinetics, nutritional status, or metabolic regulation. It can also support investigations of disorders involving retinoid homeostasis by revealing how retinol is absorbed, transported, converted, or turned over. Its value comes from combining concentration measurements with tracer-based information about metabolic movement.