carbs "color observations" (lab) Flashcards
(Iodine Test)
starch
deep blue color +
(Iodine Test) dextrin
violet +
(Iodine Test) gum arabic
no blue or red-brown color +
(Iodine Test) agar-agar
dark brown color +
(Iodine Test) none
yellow color -
(Fehling’s Test) glu gal fruc mal lac
brick red precipitate +
(Fehling’s Test) sucrose
blue solution -
(Benedict’s Test) glucose, fructose, maltose, lactose, galactose
brick red precipitate +
(Benedict’s Test) sucrose, starch
blue solution -
(Benedict’s Test) Ethanaldehyde
brick red precipitate +
(Benedict’s Test) Benzaldehyde (non-aliphatic aldehyde)
blue solution -
(Barfoed’s Test) glucose, fructose, galactose
brick red precipitate +
(Barfoed’s Test) maltose, sucrose, and lactose
blue solution -
(Picric Acid Test) glucose, fructose, maltose, lactose, galactose
mahogany red color +
(Picric Acid Test) sucrose, starch
yellow -
(Seliwanoff’s Test) sucrose and fructose
red/cherry red color +
(Seliwanoff’s Test) galactose, lactose, glucose and maltose
yellow -
(Moore’s Test) glucose, galactose, fructose, lactose, maltose, starch
brown color with caramel like odor +
(Moore’s Test) sucrose
colorless -
(Molisch’s Test) all
formation of a purple/red ring +
(Molisch’s Test) colorless -
none
(Trommer’s Test) glucose, maltose, fructose, sucrose, lactose, galactose
brick red precipitate +
(Mucic Test) galactose (sandy) and lactose (flaky)
crystal formation (precipitate) +
(Mucic Test) glucose, frucgtose, sucrose, maltose
no crystal formation -
(Bial’s Test) ribose
blue to green solution +
(Bial’s Test) glucose, fructose, galactose, sucrose, maltose, lactose
otherwise -
(Anthrone Test) all
bluish-green complex +
(Anthrone Test) none
colorless -
(Nylander’s Test) glucose, fructose, galactose, maltose, lactose
dark brown to black precipitate +
(Nylander’s Test) sucrose
no reaction -
