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Sunward

ľ³æ (³õÈëÎÄ̳)

TLC Stains
Iodine
The plate can be stained with iodine. This can be achieved rapidly, by shaking
the plate in a bottle containing silica and a few crystals of iodine. The
iodine will stain any compound that reacts with it and so is especially good f
or visualizing unsaturated compounds. Most spots show up within a few
seconds, but the stain is not usually permanent.
UV light
The plate can be viewed under a ultraviolet lamp to show any uv-active spots.

Dipping Solutions:
The plate can be treated with one of the reagents listed below and then heated
to stain the spots. The reagent can be sprayed onto the plates, but this
technique is quite hazardous and it is more effective for them to be dipped in
the reagent. To do this, first let the tlc solvent evaporate, then holding
the edge of the plate with tweezers, immerse the plate as completely as possib
le in the stain and remove it quickly. Rest the edge of the plate on a
paper towel to absorb the excess stain before heating carefully on a hot plate
or with a heat gun, until the spots show. This method is always
permanent and should be done last. When glass plates are used the spots can so
metimes be seen more clearly from the glass side of the plate.
p-Anisaldehyde
Preparation: anisaldehyde (15 g) in ethanol (250 ml) + conc. sulfuric acid (2.
5 ml).
Good general reagent, gives a range of colors. Carbohydrate
Bromocresol green: carboxylic acids
Preparation: 0.3% in 1:4 water-methanol
add 8 drops of 30% NaOH/100 mL
carboxylic acids stain yellow-green on a blue background.
Ceric Ammonium Sulfate Spray
Preparation: 1% cerium (IV) ammonium sulfate (CAS) in 50% phosphoric acid.
Vinca alkaloids (Aspidospermas).
CAM
Preparation: 400ml 10% H2SO4 (aq.) , 10g ammonium molybdate , 4g cerric ammoni
um sulfate
peptides
Ceric Sulfate (Ce(SO4)2)
Preparation: 15% aqueous sulfuric acid saturated with ceric sulfate.
Fairly general, gives a range of colors.
Distilled Water Spray
Spots turn translucent or opaque while background of plates turns clear.
2,4-DNP
Preparation: 2,4-dinitrophenylhydrazine (12 g) + conc. sulfuric acid (60 ml) +
water (80 ml) + ethanol (200 ml).
Mainly for aldehydes and ketones, gives orange spots.
Dragendorff Reagent
Preparation: Solution A: 1.7 g basic bismuth nitrate in 100 ml water/acetic ac
id (4:1). Solution B: 40 g potassium iodide
in 100 ml of water. Mix reagents together as follows: 5 ml A + 5 ml B + 20 ml
acetic acid + 70 ml water. Spray plates,
orange spots develop. Spots intensify if sprayed later with HCl, or 50% water-
phosphoric acid.
Good for phenols.
Ferric Chloride Spray
Preparation: 1% Ferric (III) Chloride in Methanol/water (1:1).
Good for phenols.
Iodoplatinate
Preparation: 10ml 5% PtCl2 20ml H2SO4 50ml H2O
alkaloids
Ninhydrin
Preparation:
200 mg ninhydrin 95 ml butanol 5 ml 10% AcOH Comments:
Good for amines.
PDAB-NaNO2 Reagent - Ehrlichs, Van Urks
Preparation: Solution A: 0.1%p-dimethylaminobenzaldehyde (PDAB) in conc. HCl.

Solution B: 0.1% NaNO2 (nitrite) in water. Spray plates with PDAB (solution A)
first - warm -heat gun, then spray with
NaNO2.
Indoles give blue colors if the 2-position of the indole ring is unsubstituted
.
Permanganate (KMnO4)
Preparation: potassium permanganate (3 g) + potassium carbonate (20 g) + 5% aq
ueous, NaOH (5 ml) + water (300 ml).
Mainly for unsaturated compounds and alcohols, gives yellow spots.
PMA
Preparation: phosphomolybdic acid (12 g)( in ethanol (250 ml).
Good general reagent, gives blue-green spots.
Sulfanilic Acid Reagent (Diazotized), Pauly's Reagent
Preparation:
Solution A: 0.5% sulfanilic acid in 2% HCl.
Solution B: 0.5% NaNO2 (nitrite) in water
Solution C: 0.5% NaOH in 50% ethanol
Mix equal volumes of A and B and spray TLC plates. Warm sprayed plate with a h
eat gun if necessary. Spray plates with
solution C.
phenolic compounds turn orange or yellow with this reagent.
Sulfuric Acid
Preparation: 5% sulfuric acid in methanol.
This reagent is usually sprayed on the TLC.
Vanillin
Preparation: vanillin (15 g) in ethanol (250 ml) + conc. sulfuric acid (2.5 ml
).
Good general reagent, gives a range of colors.
3Â¥2006-04-12 21:56:57
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