Search results
Results from the Tech24 Deals Content Network
List of reagent testing color charts. It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2] For this reason it is essential to use multiple different tests to show all adulterants.
Reagent testing is one of the processes used to identify substances contained within a pill, usually illicit substances. With the increased prevalence of drugs being available in their pure forms, the terms "drug checking" or "pill testing" [1] may also be used, although these terms usually refer to testing with a wider variety of techniques ...
Such tests that use this reagent are called the Benedict's tests. A positive test with Benedict's reagent is shown by a color change from clear blue to brick-red with a precipitate. Generally, Benedict's test detects the presence of aldehyde groups, alpha-hydroxy-ketones, and hemiacetals, including those that occur in certain ketoses.
The intensity of the color, and hence the absorption at 540 nm, is directly proportional to the protein concentration, according to the Beer–Lambert law. Despite its name, the reagent does not in fact contain biuret [(H 2 N−CO−) 2 NH]. The test is named so because it also gives a positive reaction to the peptide-like bonds in the biuret ...
The Schiff test is an early organic chemistry named reaction developed by Hugo Schiff, [ 1] and is a relatively general chemical test for detection of many organic aldehydes that has also found use in the staining of biological tissues. [ 2] The Schiff reagent is the reaction product of a dye formulation such as fuchsin and sodium bisulfite ...
Liebermann reagent. The Liebermann reagent named after Hungarian chemist Leo Liebermann (1852-1926) is used as a simple spot-test to presumptively identify alkaloids as well as other compounds. It is composed of a mixture of potassium nitrite and concentrated sulfuric acid. [ 1][ 2] 1 g of potassium nitrite is used for every 10 mL of sulfuric ...
The Mecke reagent is used as a simple spot-test to presumptively identify alkaloids as well as other compounds. It is composed of a mixture of selenous acid and concentrated sulfuric acid, [ 1] which is dripped onto the substance being tested. The United States Department of Justice method for producing the reagent is the addition of 100 mL of ...
Dragendorff's reagent is a color reagent to detect alkaloids in a test sample or as a stain for chromatography plates. Alkaloids, if present in the solution of sample, will react with Dragendorff's reagent and produce an orange or orange-red precipitate. [ 1] This reagent was invented by the German pharmacologist, Johann Georg Dragendorff (1836 ...