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Starch

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by

Mohammed Attia

on 23 November 2014

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Transcript of Starch

Starch
General Class Reaction:
Structure
Physical Characters
Condition
Solid, Powder
Colour
White
Odour
Odourless
Solubility
Insoluble with water
Insoluble with 30% NaOH
Insoluble with dil.HCl
L.P: Neutral
Action of Sodalime (CaO+NaOH):
Action of 30% sodium hydroxide:
-On cold: No action
-On Hot: Gel formation
Action of Conc.Sulphuric:
-On cold: Darkening
-On Hot: Blackening & Eff & evolution of CO and CO2
Action of ferric chloride:
No action
-On cold:No action
-On Hot: Burned sugar odour
1- Molish's test: Violet ring.
2- Barfoed's reagent: No red spots.
3- Tollen's test: No silver mirror.
Thanks for your attention
Done by:
Mohammed Attia
Procedure:
Add 2ml unk soln
+2dps Alc.alpha.Naphthol
+dps wise of Conc.H2SO4
(till formation of violet ring)

4- Fehling's test: No red to brown ppt
5- Osazone test: No Yellow ppt on boiling or after cooling
Procedure:
Add 1.5gm phenyl hydrazine
+ 0.5gm Na acetate
+ 0.5gm suger
+ 8ml water
W.B
[C6H12O5]
20 min
Special test:
1- Iodine test: Blue color
Procedure:
Add 2ml suspension
+ 2dps Iodine
n
n
2- Boiling with water: Gel formstion
3- Hydrolysis test: No Blue color
Procedure:
Add 2ml unk suspension
W.B
Procedure:
Starch suspension + Conc.HCl
W.B
15min
Change to Glucose
Iodine
No Blue color
Full transcript