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P6782 Sigma

Peroxidase from horseradish

Type VI-A, essentially salt-free, lyophilized powder, 250-330 units/mg solid (using pyrogallol), 950-2000 units/mg solid (using ABTS)

Synonym: Donor:hydrogen-peroxide oxidoreductase, Horseradish peroxidase

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Description

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.

This product is assayed using ABTS for easy comparison to other suppliers′ unit: approx. 1,000 units per mg solid

Linkage

Similar to P8375

Other Notes

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

Packaging

Packaged in mg solid

Preparation Note

The product is a 1 mg/mL solution in 0.1 M phosphate buffer(pH 6.0) and remains active for at least two weeks at room temperature. The solution retains activity after 5 freeze-thaw cycles.

Unit Definition

One ABTS unit will oxidize 1 μmole of ABTS per minute at 25 °C at pH 5.0

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

Application

Horseradish peroxidase (HRP) is isolated from horseradish roots (Amoracia rusticana). It is used in biochemistry applications such as western blots, ELISA and Immunohistochemistry. Horseradish peroxidase is used to amplify a weak signal and increase detectability of a target molecule, such as a protein. Product P6782 is type VI-A and premium quailty. It is essentially a salt-free, lyophilized powder. It is used to quantify cholesterol and cholesterol esters1 and to study in vitro lipid deposition on hydrogel and silicone hydrogel contact lenses2.

The enzyme from Sigma has been used in the development of rapid and sensitive galactose oxidase-peroxidase biosensor for galactose detection with prolonged stability. It has been used as a component of a media (MRS agar) plate containing 3,3′,5,5′-tetramethylbenzidine (TMB) for the growth of Lactobacillus sp. TMB acts as a chromogenic substrate of peroxidase. Peroxidase generates O2 from H2O2 produced by the lactobacilli, and the TMB stains the colonies blue in the presence of O2. Thus, after 48 hours of incubation under 5% CO2 in air, the colonies that produce H2O2 on MRS agar appear dark blue. H2O2 nonproducers are colorless. It has been used to study the stabilization effect of polyvinyl alcohol on horseradish peroxidase. It is also used for the determination of glucose and peroxides in solution.

Biochem/physiol Actions

HRP readily combines with hydrogen peroxide (H2O2) and the resultant [HRP-H2O2] complex can oxidize a wide variety of hydrogen donors. The optimal pH is 6.0-6.5 and the enzyme is most stable in the pH range of 5.0-9.0. HRP can be conjugated to antibodies by several different methods that include the use of glutaraldehyde, periodate oxidation, disulfide bonds, and also via amino and thiol directed cross-linkers. It is smaller and more stable than the enzyme labels, β-galactosidase and alkaline phosphatase. Hence, it is the most desired label. Also, its glycosylation leads to lower non-specific binding.3 Sodium azide, cyanide, L-cystine, dichromate, ethylenethiourea, hydroxylamine, sulfide, vanadate, p-aminobenzoic acid, as well as Cd2+, Co2+, Cu2+, Fe3+, Mn2+, Ni2+, and Pb2+ ions are found to inhibit the enzyme activity.4

When incubated with a substrate, horseradish peroxidase produces a coloured, fluorimetric, or luminescent derivative of the labeled molecule, allowing quantification. Horseradish peroxidase has been shown to slightly reduce the level of inhibition in a cydAB mutant.

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.

Price and Availability

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Safety & Documentation

Safety Information

WGK Germany 
3

Protocols & Articles

Protocols

Enzymatic Assay of Peroxidase (EC 1.11.1.7) 2,2'-Azino-bis(3-Ethylbenzthiazoline-6-Sulfonic Acid) as a Substrate

Replaces SPABTS02. Procedure updated to conform to current QUMAS formatting guidelines. Refer to CR SOP-DEK-ENZ42.
Keywords: Extinction coefficient

Enzymatic Assay of Peroxidase (EC 1.11.1.7)

This procedure is for the determination of Peroxidase enzymatic activity using Pyrogallol as the substrate. Products using this method include, but are not limited to, P1709, P2088, P6140, P6782, P81...
Keywords: Enzymology, Extinction coefficient, Gene expression, Size-exclusion chromatography

Spectrophotometric Determination of Reinheitszahl (RZ) for Peroxidase (EC 1.11.1.7)

Reinheitszahl (RZ) is the ratio of absorbance due to hemin (A403, Soret region) to absorbance due to protein (A275). This ratio (A403/A275) is not a measure of enzyme activity. Products using this me...

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Peer-Reviewed Papers

References

Set your institution to view full text papers.

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