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Creative Enzymes
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The crystal structure of latent PPO4 mushroom tyrosinase is converted via proteolytic removal of the C-terminal domain resulting in the active form of tyrosinase. As a result of this reaction, the type-3 copper center becomes exposed to monophenolic substrates (eg tyrosine) which gain access and are involved in a two-stage reaction resulting in quinone. This product subsequently polymerizes and forms the brown pigment, melanin.

http://www.creative-enzymes.com/product/Native-Mushroom-Tyrosinase_1480.html

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Tyrosinase as a multifunctional reporter gene for Photoacoustic/MRI/PET triple modality molecular imaging. http://www.creative-enzymes.com/product/Native-Mushroom-Tyrosinase_1480.html
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D-Amino Acid Oxidase isolated from porcine kidney is used in the measurement of D-alanine and FAD, and in the preparation of L-amino acids from racemic mixtures. Creative Enzymes products are not intended for use in pharmaceutical applications. http://www.creative-enzymes.com/product/Native-Porcine-DAmino-Acid-Oxidase_888.html
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Catalase is a common enzyme found in nearly all living organisms, where it functions to catalyze the decomposition of hydrogen peroxide to water and oxygen. Catalase has one of the highest turnover numbers of all enzymes; one molecule of catalase can convert millions of molecules of hydrogen peroxide to water and oxygen per second. Catalase is a tetramer of four polypeptide chains, each over 500 amino acids long. It contains four porphyrin heme (iron) groups that allow the enzyme to react with the hydrogen peroxide. The optimum pH for catalase is approximately 7, while the optimum temperature varies by species. http://www.creative-enzymes.com/common/Oxidoreductases-CAT_73_606.html
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2016-08-28
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Alanine transaminase (ALT) is a transaminase enzyme. It is also called alanine aminotransferase (ALAT) and was formerly called serum glutamate-pyruvate transaminase (SGPT) or serum glutamic-pyruvic transaminase (SGPT). ALT is found in plasma and in various body tissues, but is most common in the liver. It catalyzes the two parts of the alanine cycle. Serum ALT level, serum AST (aspartate transaminase) level, and their ratio (AST/ALT ratio) are commonly measured clinically as biomarkers for liver health. The tests are part of blood panels. http://www.creative-enzymes.com/common/Transferases-ALT_74_707.html
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Cellulase is any of several enzymes produced chiefly by fungi, bacteria, and protozoans that catalyze cellulolysis, the decomposition of cellulose and of some related polysaccharides; specifically, the hydrolysis of the 1,4-beta-D-glycosidic linkages in cellulose, hemicellulose, lichenin, and cereal beta-D-glucans. Cellulases break down the cellulose molecule into monosaccharides ("simple sugars") such as beta-glucose, or shorter polysaccharides and oligosaccharides. The name is also used for any naturally occurring mixture or complex of various such enzymes, that act serially or synergistically to decompose cellulosic material. http://www.creative-enzymes.com/product/Native-Aspergillus-Niger-Cellulase_949.html
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Enzymes play an important role in almost all cellular processes, including signaling pathways, metabolism, and gene expression, making them significant targets in drug and therapeutic development. Creative Enzymes offers enzyme assays to determine activities of key industrial enzymes: cellulase, xylanase, amylase, protease, beta-glucanase, phytase, invertase, beta-glucosidase, pectinase, lipase, and mannanase. Activity of target enzymes is analysed using standard assay methods (IUPAC or other accepted standard methods) under defined optimal working conditions.

Enzyme activity = moles of substrate converted per unit time = rate × reaction volume. Enzyme activity is a measure of the quantity of active enzyme present and is thus dependent on conditions, which should be specified. The SI unit is the katal, 1 katal = 1 mol s−1, but this is an excessively large unit. A more practical and commonly used value is enzyme unit (U) = 1 μmol min−1. 1 U corresponds to 16.67 nanokatals.
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