Indicators are chemicals added to an assay experiment to signify that the end point of the assay has been reached. The most common are pH indicators used in acid-base titrations that change colour when the titration endpoint is reached.
As fine chemical manufacturers and suppliers, DC Fine Chemicals offers a range of indicators, worldwide.
Utility and types
Depending on the mechanics of the assay, different types of indicator will be used. Some are described below:
- Acid-base indicator: Will change colour when a specific pH is reached. They must be water soluble and are selected for their visual pH interval and ease of preparation.
- Oxidation-reduction indicator (redox): Are substances that will change colour depending on their redox state: reduced or oxidized. An example is ferroin, which changes from blue to red depending on the oxidation state.
- Precipitation indicator: This is used in solubility or precipitation assessments, and generally tends to be gravimetric. Its use is one of the simplest ways to determine the endpoint in the process of performing gravimetry. A coloured compound is formed, either in solid state or in solution.
- Metallochromic indicator: Also known as complexometric indicators. They become coloured in the presence of specific ions. Once these are removed, they return to their original state and appearance.
As fine chemical manufacturers and suppliers, at DC Fine Chemicals we understand indicators as determining actors in multiple processes. Therefore, in our catalogue we have a wide range of clinical laboratory process indicators. Here we list some of them:
Some acid-base indicators:
- Phenolphthalein, Ph. Eur. (dcfinechemicals.com)
- Methyl red (C.I. 13020), ACS (dcfinechemicals.com)
- Xylenol orange tetrasodium salt, ACS (dcfinechemicals.com)
Some redox indicators:
- Methyl orange (C.I. 13025), ACS (dcfinechemicals.com)
- 1,10-Phenanthroline anhydrous (dcfinechemicals.com)
- Toluidine blue O (C.I. 52040) (dcfinechemicals.com)
Some precipitation indicators:
Some metalochromic indicators:
- Eriochrome black T (C.I. 14645), ACS (Reag. Ph. Eur.) (dcfinechemicals.com)
- Ethylenediaminetetraacetic acid, ACS (dcfinechemicals.com)
<blockquote><span style=”font-weight: 400;”>Visit our extensive catalogue and find, in addition to indicators, the variety of elements that best suit your company’s needs. If you have any questions, contact us at </span><a href=”mailto:info@dcfinechemicals.com”><b>info@dcfinechemicals.com</b></a><span style=”font-weight: 400;”> We look forward to seeing you at DC Fine Chemicals! </span></blockquote>