SRE0082

Peroxidase from horseradish

• Synonym(s): Peroxidase from horseradish, horse radish peroxidase, horseradish peroxidase, horseradish peroxidase (hrp), hrp, peroxidase, peroxidase enzyme, peroxidase from horseradish, Donor:hydrogen-peroxide oxidoreductase, Horseradish peroxidase
• CAS Number: 9003-99-0
• EC Number: 1.11.1.7 (BRENDA, IUBMB)
• EC Number: 232-668-6
• MDL number: MFCD00071339
• UNSPSC Code: 12352204
• NACRES: NA.54

Properties

• description: For research or further manufacturing use only. Not intended for direct use in humans or animals. Non-TSCA use only in US.
• Quality Level: 400
• specific activity: ≥250 units/mg solid (using pyrogallol)
• suitability: suitable for immunoassay; suitable for manufacturing use
• application(s): diagnostic assay manufacturing
• shipped in: wet ice
• storage temp.: 2-8°C
• SMILES string: [O+H2]O[O-]
• InChI: 1S/H2O3/c1-3-2/h1-2H
• InChI key: JSPLKZUTYZBBKA-UHFFFAOYSA-N

Description

General description

Horseradish peroxidase (HRP) is isolated from horseradish roots (Amoracia rusticana). HRP is a single chain polypeptide containing four disulfide bonds. Its molecular weight (~44 kDa) includes the polypeptide chain (33,890 Daltons), hemin plus Ca2+ (~700 Daltons), and carbohydrate (~9,400 Daltons). At least seven isozymes of HRP exist. The isoelectric point for horseradish peroxidase isozymes is 3.0 - 9.0.

Horseradish peroxidase is isolated from horseradish roots (Amoracia rusticana) and belongs to the ferroprotoporphyrin group of peroxidases. HRP is a single chain polypeptide containing four disulfide bridges. It is a glycoprotein containing 18% carbohydrate. The carbohydrate composition consists of galactose, arabinose, xylose, fucose, mannose, mannosamine, and galactosamine depending upon the specific isozyme. Its molecular weight (~44 kDa) includes the polypeptide chain (33,890 Daltons), hemin plus Ca²⁺ (~700 Daltons), and carbohydrate (~9,400 Daltons). At least seven isozymes of HRP exist. The isoelectric point for horseradish peroxidase isozymes ranges from 3.0 - 9.0.

Application

HRP is used in immunoassays, such as ELISAs, Western blots, and lateral flow assays. HRP is used in academic research, diagnostics, and pharmaceutical research. For more applications, see the following technical article: An Introduction to Horseradish Peroxidase (HRP) and Its Applications.

Peroxidase from horseradish has been used in western blotting.

Unit Definition

One pyrogallol unit will form 1.0 mg purpurogallin from pyrogallol in 20 sec at pH 6.0 at 20 °C.

Analysis Note

The RZ (Reinheitszahl) is the absorbance ratio A₄₀₃/A₂₇₅ determined at 0.5-1.0 mg/ml in deionized water. It is a measure of hemin content, not enzymatic activity. Even preparations with high RZ may have low enzymatic activity.

Other Notes

View more information on peroxidase at www.sigma-aldrich.com/enzymeexplorer.

Safety Information

• Pictograms: GHS08
• Signal Word: Danger
• Hazard Statements: H334
• Precautionary Statements: P261 - P284 - P501
• Hazard Classifications: Resp. Sens. 1
• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 1