5. Write the equation involved in the following tests? Molisch test Mucic acid test Bials-orcinol test Seliwanoff's test

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Chapter22: Biochemistry
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5. Write the equation involved in the following tests?
Molisch test
Mucic acid test
Bials-orcinol test
Seliwanoff's test
Transcribed Image Text:5. Write the equation involved in the following tests? Molisch test Mucic acid test Bials-orcinol test Seliwanoff's test
Reagents: 8 ml conc. Sulfuric acid, 1.5 ml alpha naphthol, 1 ml iodine in KI, 4 ml conc.
HNO,, 4 ml Seliwanoff's reagent, 3 ml Bial's-orcinol reagent, SAMPLE: 5% of
lactose, sucrose, glucose, galactose, fructose, maltose, starch and xylose
each)
( 10 ml
Materials: 12 test tubes 20 ml, test tube rack, test tube brush, test tube holder, alcohol lamp,
tripod, wire gauze, water bath, (10 ml) graduated cylinder, dropper, stirring rod, 3
droppers, 250 ml beaker
Procedure:
1. Molisch Test – (use all 8 samples) Place 1 ml of each sample in different test tubes. Add
1 drops of alpha napthol reagent in each tube. Mix thoroughly. Incline the tube and
CAREFULLY allow 1 ml of conc. H,SO, to flow down the side of the tube. Note the
color formed at the zone of contact between 2 liquids.
2. Iodine Test – ( use all 8 samples) place 1 ml of the sample in a test tube. Add a drop of
iodine. Observed color produced. Heat (direct heating) and note change in color. Cool and
record again the result.
3. Mucic acid test – place 1 ml of the sample (lactose, galactose, glucose, fructose) in
separate tubes. Add 1 ml conc. HNO, in each tube. Heat the tubes in a boiling water bath
for 1 hour. Cool at room temperature. Induce crystallization by scratching the side of the
tube with a clean stirring rod, if no crystals appear; let it stand until the next laboratory
period. Examine the crystals under the microscope and draw.
4. Seliwanoffs test – prepare 4 test tubes and place 5 drops of glucose, fructose, sucrose and
xylose in separate test tubes. Add 1 ml of seliwanoff's reagent in each of the 4 test tubes.
Immerse in a boiling water bath. Observe the color change in each tube after 3 minutes of
boiling. If no color change is observed, continue heating for another 2 minutes and
observe.
5. Bial's-Orcinol test - place 5 drops each of the sugar solution (fructose, glucose and
xylose) into a clean separate test tube. Add 1 ml of bial's-orcinol reagent into each tube.
Place the tubes in a boiling water bath. Note the color change during the 5 minutes of
heating.
Transcribed Image Text:Reagents: 8 ml conc. Sulfuric acid, 1.5 ml alpha naphthol, 1 ml iodine in KI, 4 ml conc. HNO,, 4 ml Seliwanoff's reagent, 3 ml Bial's-orcinol reagent, SAMPLE: 5% of lactose, sucrose, glucose, galactose, fructose, maltose, starch and xylose each) ( 10 ml Materials: 12 test tubes 20 ml, test tube rack, test tube brush, test tube holder, alcohol lamp, tripod, wire gauze, water bath, (10 ml) graduated cylinder, dropper, stirring rod, 3 droppers, 250 ml beaker Procedure: 1. Molisch Test – (use all 8 samples) Place 1 ml of each sample in different test tubes. Add 1 drops of alpha napthol reagent in each tube. Mix thoroughly. Incline the tube and CAREFULLY allow 1 ml of conc. H,SO, to flow down the side of the tube. Note the color formed at the zone of contact between 2 liquids. 2. Iodine Test – ( use all 8 samples) place 1 ml of the sample in a test tube. Add a drop of iodine. Observed color produced. Heat (direct heating) and note change in color. Cool and record again the result. 3. Mucic acid test – place 1 ml of the sample (lactose, galactose, glucose, fructose) in separate tubes. Add 1 ml conc. HNO, in each tube. Heat the tubes in a boiling water bath for 1 hour. Cool at room temperature. Induce crystallization by scratching the side of the tube with a clean stirring rod, if no crystals appear; let it stand until the next laboratory period. Examine the crystals under the microscope and draw. 4. Seliwanoffs test – prepare 4 test tubes and place 5 drops of glucose, fructose, sucrose and xylose in separate test tubes. Add 1 ml of seliwanoff's reagent in each of the 4 test tubes. Immerse in a boiling water bath. Observe the color change in each tube after 3 minutes of boiling. If no color change is observed, continue heating for another 2 minutes and observe. 5. Bial's-Orcinol test - place 5 drops each of the sugar solution (fructose, glucose and xylose) into a clean separate test tube. Add 1 ml of bial's-orcinol reagent into each tube. Place the tubes in a boiling water bath. Note the color change during the 5 minutes of heating.
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