Marquis reagent
Marquis reagent is used as a simple spot-test to presumptively identify alkaloids as well as other compounds. It is composed of a mixture of formaldehyde and concentrated sulfuric acid, 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 concentrated (95–98%) sulfuric acid to 5 mL of 40% formaldehyde.[1]:12 Different compounds produce different color reactions. Methanol may be added to slow down the reaction process to allow better observation of the colour change. This is done by slowing down the polymerisation process.[citation needed]
Apparently, was first discovered in 1896[2] and described by Eduard Marquis (Russian: Эдуард Маркус)[3] in his magister dissertation in 1896;[4] named after him.[5]
It is the primary presumptive test used in Ecstasy testing kits. It can also be used to test for such substances as opiates (e.g. codeine, heroin), and phenethylamines (e.g. 2C-B, mescaline).
The test is performed by scraping off a small amount of the substance and adding a drop of the reagent (which is initially clear and colorless). The results are analyzed by viewing the color of the resulting mixture, and by the time taken for the change in color to become apparent:
Results
| Substance | Color | Time (s) | Notes |
|---|---|---|---|
| MDMA or MDA | purple to black | 0-5 | may have dark purple tint |
| Amphetamine or Methamphetamine | orange to brown | 0-5 | may have a brown tint |
| 2C-B | orange to green | 5-10 | color may change from initial result |
| DXM | gray to black | 15-30 | initially no change; takes much longer to reach black than MDMA |
| Substance | Color |
|---|---|
| βk-2C-B - 2-Amino-1-(4-bromo-2,5-dimethoxyphenyl)ethan-1-one | Bright orange |
| 2C-B - 4-bromo-2,5-dimethoxyphenethylamine | Green-Yellow |
| 2C-I - 2,5-dimethoxy-4-iodophenethylamine | Green-Yellow |
| 2,5-Dimethoxy-4-bromoamphetamine (DOB) | Olive Green - Yellow |
| 2-FMA | Rapidly fizzes and dissolves. Colourless/Light yellow[citation needed] |
| 25I-NBOMe | Orange[citation needed] |
| 25C-NBOMe | Clear (No change)[citation needed] |
| 25B-NBOMe | Dark Green[citation needed] |
| 5-EAPB | Purple to Black[citation needed] |
| 5-MeO-MiPT | Clear/Light Brown[9] |
| Aspirin | Pink > Deep Red[10][11][12] |
| Adrafinil | Deep reddish orange - Dark reddish brown[citation needed] |
| Benzphetamine HCl | Deep reddish brown |
| Benzylpiperazine(BZP) | Clear (fizzes) |
| Butylone | Yellow[8] |
| Chlorpromazine HCl | Deep purplish red |
| Codeine | Very dark purple |
| Caffeine | Clear (No change) |
| Cocaine | Clear (No change) |
| d-Amphetamine HCl | Strong reddish orange - Dark reddish brown |
| d-Methamphetamine HCl | Deep reddish orange - Dark reddish brown |
| Diacetylmorphine HCl (Heroin) | Deep purplish red |
| Dimethylamylamine (DMAA) | No color change (fizzes) |
| Dimethyltryptamine (DMT) | Orange |
| Dimethoxy-meth HCl | Moderate olive |
| Doxepin HCl | Blackish red |
| Dristan | Dark grayish red |
| Exedrine | Dark red |
| LSD | Olive black |
| Methoxetamine | Slow pink[8] |
| Methylenedioxyamphetamine HCl (MDA) | Dark Purple - Black |
| Methylenedioxy-N-ethylamphetamine HCl (MDEA) | Dark Purple - Black |
| Methylenedioxymethamphetamine HCl (MDMA) | Dark Purple - Black |
| Methylenedioxypropylamphetamine HCl (MDPR) | Dark Purple - Black |
| Methylone (M1/bk-MDMA/MDMC) | Yellow |
| Methylenedioxypyrovalerone (MDPV) | Yellow |
| Pethidine/Meperidine HCl | Deep brown |
| Mescaline HCl | Strong orange |
| Methadone HCl | Light yellowish pink |
| Methylphenidate HCl | Moderate orange yellow |
| Methylene Blue | Dark Green |
| Modafinil | Yellow/Orange --> Brown[13] |
| Morphine monohydrate | deep purplish red |
| Opium | Dark grayish reddish Brown |
| Oxycodone HCl | Pale violet |
| Propoxyphene HCl | Blackish purple |
| Sugar | Dark brown |
Mechanism
The colour change from morphine is proposed to be a result of two molecules of morphine and two molecules of formaldehyde condensing to the dimeric product which is protonated to the oxoniumcarbenium salt.[14]
See also
- Pill testing
- Dille–Koppanyi reagent
- Folin's reagent
- Froehde reagent
- Liebermann reagent
- Mandelin reagent
- Marquis reagent
- Mecke reagent
- Simon's reagent
- Zwikker reagent
References
<templatestyles src="Reflist/styles.css" />
Cite error: Invalid <references> tag; parameter "group" is allowed only.
<references />, or <references group="..." />External links
- Shulgin on the Test
- Drug Testing Kit FAQ - Marquis reagent colors list, very comprehensive. Erowid.org
- DHPedia - Marquis reagent: A comprehensive list of colour reactions (inducing photographs of results)
<templatestyles src="Asbox/styles.css"></templatestyles>
 |
This chemistry-related article is a stub. You can help Wikipedia by expanding it. |
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Toxicology. Volume 2 : mechanisms and analytical methods — New York, New York ; San Francisco, California : Academic Press, 1961 — p. 247.
- ↑ Каталог диссертаций Дерптского Университета с 1811 по 1914 гг. // Ин-т экспериментальной медицины
- ↑ Marquis, Eduard. Über den Verbleib des Morphin im tierischen Organismus. Magister Dissertation 1896, Jurjew, Arb. Der Pharm. Inst. zu Dorpat 15, 117 (1896);
Pharmazeutische Zentralhalle für Deutschland., 814 (1896);
Pharmazeutische Zeitschrift für Russland. 38, 549 (1896). - ↑ Юрген Торвальд Сто лет криминалистики — М: Прогресс, 1974
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 8.0 8.1 8.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
