37108 Sigma-Aldrich

pH-Indicator strips

pH-range 3.8 - 5.5



Related Categories Analytical Reagents, Analytical/Chromatography, Application Specific Reagents, Test Papers/Sticks, pH Papers/Sticks More...
pH-range   3.8 - 5.5
suitability   corresponds for shade of color acc. to scale


Features and Benefits

Each strip has an identification scale and printed pH scale. The strips can be utilized in colored solutions and suspensions with very high precision.

Other Notes

Same product — same quality — now Sigma-Aldrich brand


Packages of 200 measuring strips.


pH indicator strip may be used during the synthesis of modified nucleotides, for site-directed DNA photoaffinity labelling of RNA polymerase III transcription complexes.

General description

Indicator papers are prepared by either direct dyes or reactive dyes. During reactive dyes procedure, pure linters are suspended in water and reactive dye is added. The mixture is made alkaline for the reaction to start. The fiber pulp is centrifuged, washed to be electrolyte-free and processed as pH paper. Paper produced in this way is bonded to plastic material in order to be used as stick or strip. Some strips are produced by impregnation which bleed, certain portion of the indicator dye dissolves in the test solution during immersion. pH strips with covalently bonded indicator dyes remain indefinitely in solution without migration or dissolution.

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Safety & Documentation

Safety Information

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Certificate of Analysis

Protocols & Articles
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