V900503

Peroxidase from horseradish

Vetec^™, reagent grade

• Synonym(s): 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

Properties

• grade: reagent grade
• product line: Vetec^™
• form: powder
• specific activity: ≥250 units/mg solid
• mol wt: ~44 kDa
• 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 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.

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.

Legal Information

Vetec is a trademark of Merck KGaA, Darmstadt, Germany

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