Reagent Marqui

Colour Tests. Formaldehyde-Sulphuric Acid—red-violet Forrest Reagent—red FPN Reagent—orange Mandelin s Test— green- violet (excess reagent) Marquis Test—violet-brown. 

Colour Tests. Mandelin s Test—green, sometimes violet, depending on relative proportions of test material and reagent Marquis Test—violet. 

Froehde s Reagent MandeTin s Reagent Marquis Reagent... 

Marquis reagent (gives a purple-red coloration, then violet, then blue with morphine, codeine, dionine, and heroine) mix 3 mL of concentrated H2SO4 with 3 drops of a 35% formaldehyde solution. 

The reaction mechanism has not been elucidated. It is possible that formaldehyde reacts by oxidation as in the Marquis reaction (see formaldehyde — sulfuric acid reagent), whereby colored salts are formed with naphthoquinone sulfonic acid. 

Color reactions are more or less clearly defined reactions of the substances with suitable reagents. Substance-specific reactions are not usually available, e. g. many compounds with aromatic skeletons give both a positive Vitali-Morin reaction [1 -4] and a positive Marquis reaction [4]. Again, numerous aldehydes react with electron-rich compounds in acidic medium to yield colored substances (cf. Chapters 2 and 3.1). 

Fomaldehyde (Marquis [ii] and Prochazka reagent), furfural, 4-methoxybenzalde-hyde, 4-(dimethylamino)-cinnamaldehyde and 4-(dimethylamino)-benzaldehyde (Ehrlich s, Van Urk s, Morgan-Elson or EP reagents) react according to this scheme with... 

Maltodextrin 182 Maltose 164,165, 181-184 Mandelin s reagent 426 Manganese cations 144 Manganese(II) chloride reagent 333 Mannitol 409,410 Marking the front 132 Marmesin 67 Marquis reaction 352 Marquis reagent 299 Matacil 107... 

Test 3 Marquis Test Mix 1 volume of formaldehyde solution with 9 volumes of sulfuric acid. Add a drop of the reagent to the primaquine phosphate sample on a white tile an orange color is produced [2]. 

The Marquis reagent testing kit can be used to test if a pill contains ecstasy or PMA. Fact—The kit produces a dark blue-purple color in the presence of ecstasy and no color change in response to PMA. However some pills containing PMA also contain ecstasy, so a positive result for ecstasy does not mean the pill is free of PMA. 

Marquis Test Prepare the reagent by mixing 1 volume of formaldehyde with 9 volumes of sulfuric acid. When dipyridamole is reacted with this reagent, the resulting solution has an orange color. 

Marquis Test (p. 139). Many basic drugs produce colours with diis reagent. It is a good test for opiates, stimulants, antihistamines, and pheno-thiazines. 

Forrest Reagent FPN Reagent Liebermann s Test Mandelin s Test Marquis Test Nessler s Reagent Sulphuric Acid... 

Method 1. Place a portion of the sample in each of two ignition tubes and to one tube add some solid sodium hydroxide. Heat both tubes carefully, allow water vapour to escape, insert into the vapours in each tube an open capillary tube containing Marquis reagent, and observe the colour of the reagent. 

Note. This reagent is not the same as that used in the Marquis Test. 

Marquis reagent. This reagent is preferably poured on to the plate because of the danger of spraying concentrated acid. Black or violet spots are given by alkaloids related to morphine. Many different colours are given with a variety of drugs (see under Colour Tests, p. 139). 

Colour Tests. Formaldehyde-Sulphuric Acid—blue-violet Forrest Reagent—red FPN Reagent—brown-orange Lieber-mann s Test—brown Mandelin s Test—green—> red Marquis Test—yellow-green— red. 

Thin-layer Chromatography. System TA—Rf system TB—Rf 03 system TC—Rf 25. Dragendorffspray, positive FPN reagent, pink acidified iodoplatinate solution, positive Marquis reagent, orange.)... 

Colour Tests. Ammoniacal Silver Nitrate—red-brown/red-brown Ferric Chloride—green Folin-Ciocalteu Reagent— blue Marquis Test—orange—> violet Methanolic Potassium Hydroxide—pink-orange—> brown Nessler s Reagent—black Palladium Chloride—orange —> brown Potassium Dichromate (Method 1)—green— brown. 

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