HPLC Method for Cystine on Primesep 100 by SIELC Technologies

High Performance Liquid Chromatography (HPLC) Method for Analysis of Cystine

Cystine is an organic compound with the molecular formula C₆H₁₂N₂O₄S₂.

Properties:
Appearance: Typically appears yellowish with a waxy, compact, and partially opaque texture.

Molecular weight: ~240.3 g/mol

Solubility: Soluble in water with HCL or NaOH.

Uses: Plays a crucial role in various biological processes due to its ability to stabilize protein structures and its role as a precursor to the antioxidant glutathione.

Cystine can be retained and analyzed using the Primesep 100 stationary phase column. The analysis utilizes an isocratic method with a simple mobile phase consisting of water, acetonitrile (MeCN), and sulfuric acid. Detection is performed using UV at 200 nm.

For optimal results in HPLC analysis, it is recommended to measure absorbance at a wavelength that matches the absorption maximum of the compound(s) being analyzed. The UV spectrum shown can assist in selecting an appropriate wavelength for your analysis. Please note that certain mobile phases and buffers may block wavelengths below 230 nm, rendering absorbance measurement at these wavelengths ineffective. If detection below 230 nm is required, it is recommended to use acetonitrile and water as low UV-transparent mobile phases, with phosphoric acid and its salts, sulfuric acid, and TFA as buffers.
For some compounds, the UV-Vis Spectrum is affected by the pH of the mobile phase. The spectra presented here are measured with an acidic mobile phase that has a pH of 3 or lower.

HPLC Method for Separation of Cysteine, Glutathione, reduced, Cystine, Cysteine-glutathione disulfide, Glutathione oxidized on Primesep 100 by SIELC Technologies

These compounds are all involved in redox reactions and cellular defenses against oxidative stress in biological systems. Here’s a bit more about each of them:

Cysteine is an amino acid with the chemical formula C₅H₁₀N₂O₃. It is primarily a building block for protein, but it also has antioxidant effects. On occasion, it is used to support people dealing with cancer, diabetes, and hangover, but there is yet to be substantial evidence that it works. Poultry, egg, beef, and whole grains are rich sources of the amino acid. This is a sulfur-containing amino acid that’s used in the biosynthesis of proteins. Its thiol side chain often participates in enzymatic reactions, and contributes to the stability of proteins by forming disulfide bonds. You can find detailed UV spectra of Cysteine and information about its various lambda maxima by visiting the following link.

Glutathione, reduced (GSH) is a tripeptide (small protein) consisting of the amino acids glutamic acid, cysteine, and glycine. It has the chemical formula C₁₀H₁₇N₃O₆S. GSH serves as an antioxidant, helping to prevent damage to cellular components caused by reactive oxygen species such as free radicals and peroxides. In fact, it is the most prevalent endogenous antioxidant, protecting cells from damage by neutralizing harmful free radicals and reactive oxygen species. It also regenerates other antioxidants, like vitamins C and E, from their oxidized forms. It contributes to the neutralization of many different types of harmful substances, such as pollutants, heavy metals, and some drugs, thereby aiding in the detoxification process. Not only that, it plays a crucial role in the proper function of white blood cells, including T cell lymphocytes—the foundation of adaptive immunity. Low levels of glutathione have been linked to several diseases, including cancer, neurodegenerative disorders such as Parkinson’s disease, cardiovascular diseases, and HIV/AIDS. Additionally, glutathione levels typically decrease with age, which can contribute to the aging process. Glutathione is primarily synthesized in the liver and then distributed to other tissues in the body. It can also be obtained from some foods, especially fruits, vegetables, and meats. You can find detailed UV spectra of Glutathione and information about its various lambda maxima by visiting the following link.

Cystine is an amino acid with the molecular formula C₆H₁₂N₂O₄S₂. It plays a crucial role in various biological processes due to its ability to stabilize protein three-dimensional structures. It is a covalently bonded dimer molecule of two cysteine molecules, connected through a disulfide bond. Disulfide bonds between cysteine residues in peptide chains contribute to the 3D structure of proteins. In dietary supplements and food labeling, this compound is often referred to as a conditionally essential amino acid. It serves as a major precursor for the synthesis of glutathione. UV spectra of Cystine and information about its various lambda maxima by visiting the following link.

Cysteine-glutathione disulfide (CySSG) is a mixed disulfide with the chemical formula C₁₃H₂₂N₄O₈S₂. It is formed by the reaction of glutathione with the oxidized form of cysteine (cystine). It is one of the forms in which cysteine is stored and transported in plasma. UV spectra of Cysteine-glutathione disulfide and information about its various lambda maxima by visiting the following link.

Oxidized glutathione, or glutathione disulfide (GSSG), is a form of the antioxidant molecule glutathione with the chemical formula C₂₀H₃₂N₆O₁₂S₂. Glutathione exists in two forms: the reduced form (GSH), which is the active antioxidant, and the oxidized form (GSSG). When glutathione neutralizes a free radical or a reactive oxygen species, it becomes oxidized and forms GSSG. The ratio of GSH to GSSG within cells is often used as a measure of cellular oxidative stress. The body can convert GSSG back into the active GSH form using an enzyme called glutathione reductase, provided there are adequate levels of NADPH, a compound integral to many cellular processes, including the antioxidant response.

Overall, these molecules play vital roles in the body’s antioxidant defenses, detoxification of xenobiotics, modulation of redox-controlled signaling pathways, and regulation of cellular proliferation and apoptosis.

Cysteine, Cystine, Cysteine-glutathione disulfide, Glutathione, Glutathione oxidized (GSSG) can be retained, separated, and analyzed using a reverse-phase Primesep 100 column. The mobile phase for this method consists of water, acetonitrile (MeCN), and Sulfuric acid, which serves as a buffer.

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HPLC Method for Cysteine, Cystine on Primesep 100 by SIELC Technologies

High Performance Liquid Chromatography (HPLC) Method for Analysis of Cysteine, Cystine.

L-Cysteine is an amino acid with the chemical formula C₅H₁₀N₂O₃. It is primarily a building block for protein, but it also has antioxidant effects. On occasion, it  is used to support people dealing with cancer, diabetes, and hangover, but there is yet to be substantial evidence that it works. Poultry, egg, beef, and whole grains are rich sources of the amino acid. You can find detailed UV spectra of Cysteine and information about its various lambda maxima by visiting the following link.Cystine is an amino acid with the molecular formula C₆H₁₂N₂O₄S₂. It plays a crucial role in various biological processes due to its ability to stabilize protein three-dimensional structures. It serves as a major precursor for the synthesis of glutathione. UV spectra of Cystine and information about its various lambda maxima by visiting the following link.Cysteine, Cystine can be retained and analyzed using the Primesep 100 stationary phase column. The analysis utilizes an isocratic method with a simple mobile phase consisting of water and acetonitrile (MeCN) with a sulfuric acid buffer. Detection is performed using UV.

Mixed-mode chromatography allows separating, in single run, compounds with vastly different properties. A method for separation of amino acids (cysteine, methylcysteine, cystine and dimethylcysteine) in the presence of carboxylic acid (benzoic) and hydrophobic neutral compounds was developed on Primesep 100 mixed-mode column. At lower pH ionization of carboxylic acids is suppressed. Amino acids are retained as basic compound based on reverse phase and cation exchange mechanisms. Carboxylic acids are retained on this column based on weak reverse phase mechanisms. Neutral compounds are retained by reverse phase mechanism as on any other column. Retention time of basic, zwitter-ionic and hydrophobic compound can be adjusted by manipulation of mobile phase composition. ELSD, UV or LC/MS detection can be used based on the properties of analytes and mobile phase selection.