Chemical test for Tragacanth Organoleptic test: Appearance: Crystalline tragacanth Colour: White or faint yellow tragacanth Odour: None tragacanth Taste: Mucilaginous tragacanth Solubility: Insoluble in alcohol, partially soluble in water tragacanth Chemical test: SI.No. Test Observation Inference 1. To 4ml of 0.5%w/v solution add 0.5ml of HCl and heat for 30minutes on water bath Divide the hydrolyzed product in 2 parts a) 1 st part=Add 1.5ml of NaOH solution to neutralize and add Fehling’s solution A and B in equal quantities(mixed before) and warm over water bath. b) 2 nd part= Add barium chloride solution Red ppt o
Chemical test for Benzoin Objective: To perform the chemical test for BENZOIN Biological source: It is a balsamic resin obtained from Styrax benzoin. Fam- Styraceae Physical characteristics: Appearance - Crystalline Colour - Greyish brown Odour - Aromatic and characteristics, balsamic Shape - Tear Taste - sweet and slightly acrid Sr. No. Test Observation Inference 1. Heat 0.5g of substance in dry test tube Evolve white fumes which condense to form white crystalline sublimate in the upper part of tube. Benzoin present 2. Alcoholic solution + water White milky solution formed Benzoin present 3. Alcoholic solution of litmus treat with litmus paper Acidic to litmus paper. Benzoin present 4. Heat 0
Chemical test for Agar/Agar-Agar / Japaneese Isinglass Organoleptic test: Appearance: Coarse,Crystalline acacia, agar Colour: Pale yellow agar Odour: Marine algae type agar Taste: Mucilaginous agar Solubility: Insoluble in coldwater, soluble in hot water agar Chemical test: SI.No. Test Observation Inference 1. Boil 1gm of agar with 10ml of water until solution is affected, cool to room temperature A slip jet is formed. (Jelly like mass is formed) Agar 2. 0.2% solution of agar, + aqueous solution of tannic acid No Precipitate is formed Distinction from gelatin 3. Warm little sample in alcoholic solutio
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