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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. 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. Apparently, was first discovered in 1896〔(Toxicology. Volume 2 : mechanisms and analytical methods ) — New York, New York ; San Francisco, California : Academic Press, 1961 — p. 247.〕 and described by Eduard Marquis ((ロシア語:Эдуард Маркус))〔(Каталог диссертаций Дерптского Университета с 1811 по 1914 гг. ) // Ин-т экспериментальной медицины〕 in his magister dissertation in 1896;〔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).〕 named after him.〔Юрген Торвальд (Сто лет криминалистики ) — М: Прогресс, 1974〕 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== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Marquis reagent」の詳細全文を読む スポンサード リンク
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