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  • Identifying Sugars, Starches, Lipids & Proteins: Chemical Tests & Indicators
    Simple sugars:

    * Benedict's solution: Turns from blue to green, yellow, orange, or red depending on the concentration of sugar present.

    * Fehling's solution: Turns from blue to green, yellow, orange, or red depending on the concentration of sugar present.

    * Barfoed's solution: Turns from blue to colorless or yellow depending on the concentration of sugar present.

    * Nylander's reagent: Turns from blue to green, yellow, or red depending on the concentration of sugar present.

    Starches:

    * Iodine solution: Turns from yellow to blue-black in the presence of starch.

    * Benedict's solution: Turns from blue to green, yellow, orange, or red depending on the concentration of sugar present.

    * Fehling's solution: Turns from blue to green, yellow, orange, or red depending on the concentration of sugar present.

    * Barfoed's solution: Turns from blue to colorless or yellow depending on the concentration of sugar present.

    * Nylander's reagent: Turns from blue to green, yellow, or red depending on the concentration of sugar present.

    Lipids:

    * Sudan III: Stains lipids red or orange.

    * Oil Red O: Stains lipids red.

    * Nile Blue A: Stains lipids blue or bluish-white.

    * Fluorescein diacetate: Stains lipids green fluorescent.

    Proteins:

    * Biuret reagent: Turns from blue to purple in the presence of protein.

    * Ninhydrin reagent: Turns from yellow to purple in the presence of protein.

    * Xanthoproteic acid: Turns from yellow to orange in the presence of protein.

    * Millon's reagent: Turns from colorless to red in the presence of protein.

    * Folin-Ciocalteu reagent: Turns from yellow to blue in the presence of protein.

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