Page 22 - Phytochemistry -1 (PG404) / Clinical Pharmacy 2nd level students ( 2019 )

Clinical pharmacy PharmD program Third level Phytochemistry-1 (PG-504)

one or more uronic acid units in their molecular structure, they are

sometimes called derived carbohydrates.

A. Gums

Item Gum acacia (gum Gum tragacanth Artificial gum
Arabic)
Source Natural Natural Artificial
Solubility Soluble (no gel Insoluble (gel) : Insoluble
formation) Bassorin adhesive gel.
Aqueous Levorotatory levorotatory dextrorotatorty
solution
Composition - 1 Arabin: Ca, K, - 1 Tragacanthin : Dextrin
Mg salts of arabic water soluble Incomplete starch
acid. part. hydrolysis.

- 2 Oxidase enzyme: - 2 Bassorin: poly Its complete
turns benzidine or methoxylated hydrolysis gives
tr. Guaiacum into acid, H₂O glucose.
blue. insoluble part.

- 3 Galacto - uronic
acid.

- 4 Pentosans,
mucilage and
starch.

Test Gum acacia (gum Gum tragacanth Artificial
Arabic) gum
Pentose test +ve +ve -ve
Benzid./H₂O₂ Blue/ greenish blue -ve -ve

I₂ test Yellowish brown Minute scatered Reddish
due to blue points brown
starch
Pb(Ac)₂ No white precipitate white precipitate white
precipitate

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