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StartMicrobiologyPicric Acid Take a look at for Glucose

Picric Acid Take a look at for Glucose

Picric acid take a look at is used for decreasing sugars, and is a extremely delicate chemical exams. Picric acid reactions (poisonous yellow crystal stable) which can be referred to chemically as 2,4 6-trinitrophenol (TNP) reacts with sugars which can be lowered to create Picramic Acid that’s red-colored.

The Picric Acid take a look at is made up of a sugar that has purposeful ketone or free aldehyde teams inside its molecular construction, which acts as an agent to scale back. Examples embrace fructose, glucose and lactose. maltose and arabinose. aside from sucrose.

Precept of Picric Acid Take a look at

The Picric Acid response may be described as a delicate chemical take a look at to find out the presence of decreasing sugars in carbohydrates. Picric Acid (poisonous Yellow crystal stable) is also referred to as chemically as 2,4,6 trinitrophenol (TNP) Picric acid response happens when there are current decreasing sugars and ends in Picramic Acid which is red-colored.

Lowered properties are noticed within the monosaccharides and disaccharides which have a free aldehyde or ketone. Lowered sugars comprise the free aldehyde or ketone group with the aptitude of decreasing.

In an alkaline surroundings, they scale back the natural acids in varied kinds. With a purpose to make the answer alkaline, primary sodium carbonate (Na2CO3) is added. Picric acid (yellow resolution) is transformed to picramic acid by way of decreasing sugars (mahogany the purple resolution).

Principle of Picric Acid Test
Precept of Picric Acid Take a look at | Supply:



  • Boiling water bathtub
  • Pipette
  • Take a look at tube
  • Take a look at tube stand

Chemical substances

  • Picric acid
  • Sodium Carbonate

Picric Acid

  • Saturated picric acid: Dissolve 13 mg picric Acid in 100mL Double distillated water, then boil the answer after which permit to chill.
  • 10% Sodium Carbonate: Dissolve 10 grams of Sodium Carbonate in 50 mL water, dilute it with water to 50 mL, then combine.

Process of Picric Acid Take a look at

  1. Add 1mL of the above reagent to 1mL of the take a look at resolution adopted by 0.5 mL of 10% Sod. Carbonate resolution.
  2. Warmth the take a look at tube in a boiling water bathtub.
  3. Observe the colour of the answer.

Results of Picric Acid Take a look at

Optimistic consequence within the picric acid response is the looks of a mahogany purple color within the resolution. It is a signal of the presence of decreasing sugar inside the resolution.

Result of Picric Acid Test
Results of Picric Acid Take a look at | Picture Supply:

Software of of Picric Acid Take a look at

Picric acid take a look at is used to detect the decreasing sugars. Mahogany purple resolution is the optimistic consequence. A compound (right here sugar, saccharides or sugar) that has the free aldehyde or ketone group can have discount properties. When they’re in an alkaline resolution they’ll scale back natural acids. To make the answer extra alkaline (or primary), Sodium Carbonate (Na2Co3) may be added. Within the course of, lowered sugars rework Picric Acid response (yellow resolution) to picramic acid (mahogany purple resolution).


  • https://studylib.web/doc/6662411/carbohydrates-tests-2
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