Substrats d'enzymes

<p>Aldol® 515 acetate is a chromogenic and fluorogenic substrate, used for detection of esterase activity. The colorless product is cleaved by purified esterase, or esterase secreted by microorganisms in liquid or solid media, yielding a red color and red fluorescence signal when Aldol® 355 fluorescence enhancer or a suitable matrix is present. Aldol® 515 acetate can be used under aerobic and anaerobic conditions. Well detectable color/fluorescence of bacterial colonies or liquid cultures is obtained within 16-48 h. In the presence of a purified esterase, color and fluorescence develops within minutes to few hours.</p>

<p>Acetyl-L-alanine 7-amido-4-methylcoumarin is a fluorogenic substrate for aminopeptidase. The enzyme cleaves the N-terminal amino acids, yielding a blue fluorescent solution.</p>

<p>Luc-coliforms Na is a fluorogenic substrate that is used in the diagnosis of bacterial contamination. It is a conjugate of the enzyme luciferase and the substrate coelenterazine, which are combined in a buffer solution. Luc-coliforms Na is used to detect bacteria by adding it to a culture broth or other growth media. The bacteria will emit light as they break down the luc-coliforms Na and produce ATP, which can then be measured with an appropriate detector. Luc-coliforms Na can also be used as a stain for gram-negative rods, such as coliforms, e.g., Escherichia coli, Enterobacter aerogenes, Klebsiella pneumoniae, Proteus mirabilis.</p>

<p>4-Methylumbelliferyl-2-O-(alpha-L-fucopyranosyl)-beta-L-fucopyranoside is a fluorogenic substrate for alpha-L-fucosidase. After enzymatic cleaveage, free 4-methylumbelliferone (also known as hymecromone) is released, exhibiting blue fluorescence upon excitation with UV light. The strongest fluorescence of 4-methylumbelliferone requires deprotonation of the hydroxyl group (thus requires alkaline pH), with a maximal fluorescence intensity obtained with excitation at 350 to 370 nm and emission at 440 to 470 nm. The use of 4-methylumbelliferyl-2-O-(alpha-L-fucopyranosyl)-beta-L-fucopyranosideas a substrate for measuring the alpha-L-fucosidase activity is used for diagnosis of fucosidosis (defficiency of L-fucosidase).</p>

<p>5-Bromo-4-chloro-3-indoxyl-alpha-D-N-acetylneuraminic acid, cyclohexylammonium salt is a Fluorogenic substrate used for the detection of an enzyme that converts sialic acid to fluorescein. This product has a high quality and purity with a CAS number. It is used in Culture media as a conjugate, Enzyme substrate, Food testing, High purity, Diagnostics, ligand, Chromogenic substrate, Environmental testing. The product has been tested and found to be safe for use with animals and humans.</p>

<p>Chromogenic substrate for N-Acetyl-β-D-galactosaminidase yielding a salmon-colored precipitate.</p>

<p>Coelenterazine e is a synthetic, fluorescent amino acid that can be used to measure calcium ion concentration. It binds to calcium ions and emits light when excited with blue light. Coelenterazine e is an analog of coelenteramide, which is a luminescent protein found in jellyfish. Coelenterazine e has been shown to emit fluorescence when it interacts with calcium ions, while coelenteramide emits bioluminescence instead. The emission of light from coelenterazine e is due to the stabilization of the molecule by calcium ions.</p>

<p>A non-metabolizable allolactose analogue, widely used in molecular biology for overexpression of recombinant proteins from inducible systems under the control of lac promoter. IPTG binds to the LacI repressor and causes its release from the lac operator, allowing gene expression to take place. Present in vectors of pGEX, pGEM-T, pET, pRSET, pMAL class and others.</p>

<p>4-Methylumbelliferyl 2-O-(a-L-fucopyranosyl)-b-D-galactopyranoside is an enzyme substrate used in chromogenic assays of alpha-fucosidases. It is also used for glycoprocessing enzymes in synthesis.</p>

<p>6-Bromo-2-naphthyl beta-D-glucuronide is a substrate for beta-glucuronidase, an enzyme involved in detoxification and bacterial metabolism. Upon enzymatic hydrolysis, it releases 6-bromo-2-naphthol, which forms a detectable dye when reacted with diazonium salts. This compound is widely used in microbiology to detecting E. coli in water testing and histochemical staining. 6-Bromo-2-naphthyl beta-D-glucuronide is also been used in cancer research studies. It has been found that some tumors are related to a high activity of beta-glucuronidase, responsible to reactivate the carcinogens and promote tumor progression, developing a drug resistance to chemotherapy.</p>

<p>4-Nitrophenyl beta-L-arabinopyranoside is a chromogenic substrate for beta-L-arabinosidase. Upon hydrolysis, para-nitrophenol is released yielding a yellowish colour. 4-Nitrophenyl beta-L-arabinopyranoside is used in different applications such as the Bacterial arabinan degradation assays, gut microbiome analysis</p>

<p>Chromogenic α-maltosidase substrate yielding a yellow solution upon cleavage.</p>

<p>3-(7-Hydroxycoumarin-3-carboxamido)propyl 4-O-(b-D-galactopyranosyl)-b-D-glucopyranoside is a fluorogenic substrate that is used for the detection of beta-galactosidase. It has been shown to be an efficient substrate for the enzyme beta galactosidase and can be used to detect this enzyme in cell culture media and other diagnostic applications. 3-(7-Hydroxycoumarin-3-carboxamido)propyl 4-O-(b-D-galactopyranosyl)-b-D-glucopyranoside can also be used as a chromogenic substrate, which is added to a reaction mixture containing beta galactosidase, where it is hydrolyzed by the enzyme to produce a blue color. This product also has food testing and environmental testing applications.</p>

<p>N-CBZ-L-Lysyl-L-lysyl-L-arginine 7-amido-4-methylcoumarin triacetate is a synthetic peptide substrate used as a fluorogenic substrate for aminopeptidase.</p>

<p>Fluorogenic substrate for N-Acetyl-β-D-glucosaminidase yielding a blue fluorescent solution. Used for rapid identification of Salmonella species.</p>

<p>4-Methylumbelliferyl-beta-D-ribofuranoside is a chemical compound that belongs to the class of phenols. It has been found in Australian plants and animals. 4-Methylumbelliferyl-beta-D-ribofuranoside is used as a corrosion inhibitor. This chemical has been shown to be effective against corrosion in mammals.br&gt;br&gt;<br>4-Methylumbelliferyl-beta-D-ribofuranoside can also be used as a fluorescent probe for studying cell membrane activity.</p>

<p>Chromogenic substrate for beta-glucosidase</p>

<p>4-Methylumbelliferyl 2-deoxy-2-sulfamino-a-D-glucopyranoside sodium salt (M3A or MU-GlcNS) is a fluorogenic substrate of heparin sulfamidase, used in the diagnosis of Mucopolysaccharidosis III type A (MPS III A). MPS III A, also known as Sanfilippo syndrome type A, is caused by the deficiency of heparan N-sulfatase. Heparin sulfamidase in the assay desulfates MU-GlcNS to 4-methylumbelliferyl 2-amino-2-deoxy-α-D-glucopyranoside (MU-GlcNH2). To release fluorometrically measurable 4-methylumbelliferone (MU) and by-product glucosamine, MU-GlcNH2 is further hydrolysed by an enzyme such as yeast α-glucosidase during a second incubation.</p>

<p>6-Chloro-3-indoxyl choline phosphate is a chromogenic substrate for phosphatidylcholine-specific phospholipase C (PC-PLC) for the detection of mibrobial metabolites. The use of this specific substrate permits monitoring the activity of PC-PLC. This an important enzyme for the regulation of steady-state levels of phosphatidylcholine (PC) and diacylglycerol (DAG). Abnormally high levels of PC-PLC activity in various tissues have been linked to many disease progressions.</p>

<p>Luc-S.aureus K is an enzyme conjugate containing luciferase and a specific antibody against Staphylococcus aureus. It is used for detection of S.aureus in laboratory cultures, food, and environmental samples. The light produced by this product is proportional to the amount of bacteria present in the sample. This product can be used as a chemiluminescent substrate for detecting alkaline phosphatase activity or as a fluoro-luminescent substrate for detecting beta-galactosidase activity. Luc-S.aureus K has high purity and high quality, with 100% specific binding affinity for S.aureus and no cross reactivity with other bacteria or host cells, making it suitable for use in diagnostic applications.</p>