| Mandelin's reagent | A solution of ammonium vanadate in sulfuric acid, used in colour tests for alkaloids. (05 Mar 2000) |
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| reagent | <technique> A histochemical technique based on periodic acid oxidation of a substance containing the 1,2-glycol grouping. It is used for staining carbohydrates as the resulting dialdehyde reacts with Schiff reagent to form a coloured product. The adjacent hydroxyl groups are oxidized to form aldehydes by periodic acid (HIO4) and these aldehyde groups react with Schiff's reagent (basic fuchsin decolourised by sulphurous acid) to give a purple colour. Acronym: PAS (18 Nov 1997) |
| reagent strips | Narrow pieces of material impregnated or covered with a substance used to produce a chemical reaction. The strips are used in detecting, measuring, producing, etc., other substances. (12 Dec 1998) |
| Marme's reagent | A solution of potassium iodide and cadmium iodide used in testing for alkaloids. (05 Mar 2000) |
| Marquis' reagent | A solution of formaldehyde in sulfuric acid used in colour tests for formaldehyde. (05 Mar 2000) |
| Girard's reagent | The hydrazine of betaine chloride, used to extract ketonic steroids by forming water-soluble hydrazones with them. (05 Mar 2000) |
| Mecke's reagent | A solution of selenous acid in sulfuric acid, used for colour tests of alkaloids. (05 Mar 2000) |
| melzer's reagent | A stain used to study the cellular structure of fungi. (09 Oct 1997) |
| Gunzberg's reagent | Phloroglucin and vanillin used as a reagent in Gunzberg's test. (05 Mar 2000) |
| Meyer's reagent | A solution of phenolphthalein 0.032, in decinormal sodium hydroxide 21, with water (distilled from glass) sufficient to make 100; in the presence of minute traces of blood, the solution becomes purple or blue-red. (05 Mar 2000) |
| Rosenthaler-Turk reagent | A solution of potassium arsenate in sulfuric acid used in obtaining colour tests for various opium alkaloids. (05 Mar 2000) |
| Millon's reagent | Mercuric nitrate and nitric acid as used in the Millon reaction. (05 Mar 2000) |
| Cleland's reagent | <chemical> A reagent commonly used in biochemical studies as a protective agent to prevent the oxidation of sh (thiol) groups and for reducing disulphides to dithiols. Pharmacological action: sulfhydryl reagents, expectorants. Chemical name: 2,3-Butanediol, 1,4-dimercapto-, (R*,R*)- (12 Dec 1998) |
| Wurster's reagent | Filter paper impregnated with tetramethyl-p-phenylenediamine, which turns blue in the presence of ozone or hydrogen peroxide. (05 Mar 2000) |
| cross-linking reagent | <chemistry> Reagents with two reactive groups, usually at opposite ends of the molecule, that are capable of reacting with and thereby forming bridges between side chains of amino acids in proteins; the locations of naturally reactive areas within proteins can thereby be identified; may also be used for other macromolecules, like glycoproteins, nucleic acids, or other. (12 Dec 1998) |