Folin-Ciocalteu's reagent 1.9 - 2.1 N for analysis of phenols, suitable for determination of total protein by Lowry method, Sigma-Aldrich®

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Synonyms: Folin & Ciocalteu’s phenol reagent

M-Clarity™ quality level = MQ200

F9252-500MLEA 97.9 GBP
F9252-500ML F9252-1L F9252-100ML
Folin-Ciocalteu's reagent 1.9 - 2.1 N for analysis of phenols, suitable for determination of total protein by Lowry method, Sigma-Aldrich®
Folin-Ciocalteu's reagent

Folin & Ciocalteu's phenol reagent is most commonly used in the Lowry method for determining protein concentration. It has also been used for the quantification of total phenolics. In this method, protein is pretreated with copper(II) in a modified biuret reagent (alkaline copper solution
stabilized with sodium potassium tartrate). Addition of the phenol reagent generates chromogens that give increasing absorbance between 550-750nm. Normally, absorbance at the peak (750 nm) or shoulder (660 nm) are used to quantitate protein concentrations between 1 - 100 mg/ml while absorbance at 550 nm is used to quantitate higher protein concentrations.


  • Folin & Ciocalteu's phenol reagent has been used for the estimation of total phenolic content in samples.


Many modifications of the original assay procedure have been published, including methods for enhancing the color development, for determining the content of insoluble proteins, and for automating the procedure. Compounds including many buffers, chelating agents, detergents, and cyclic organic compounds can interfere with the Lowry protein assay. Folin & Ciocalteu's phenol reagent can also be used as a spray reagent in chromatographic procedures.


In the absence of copper, color intensity is determined primarily by the tyrosine and tryptophan content of the protein, and to a lesser extent by cysteine and histidine. Copper(II) has no effect on color formation by tyrosine, tryptophan, or histidine, but reduces color formation due to cysteine.

Density: 1.22 g/cm³ (20 °C)
Storage Temperature: Room Temperature
MDL Number: MFCD00132625
UN: 3264
ADR: 8,III

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Specification Test Results

Appearance (Turbidity) Clear
Appearance (Colour) Faint Yellow to Very Dark Yellow and Faint Green-Yellow to Very Dark Green-Yellow
Appearance (Form) Solution
Concentration 1.9 - 2.1 N
Suitability
Suitable for Use in Lowry Protein Determination
Suitable
Recommended Retest Period 4 years

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