Botany and medicinal plants -...
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Botany and medicinal plants
Pharmacognosy Department Faculty of Pharmacy
Cairo University
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Dusting Powders
1-Potato Starch
2-Wheat Starch
3-Maize Starch
4-Rice Starch
(Fine powders)
Starches Non- Starches
It is the principal reserve food material of plants,
stored in seeds, fruits , tubers and roots.
It is the first product of photosynthesis.
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Uses (Importance) of starches:
4- Sterilizable maize starch is used as
lubricant for surgeons’ gloves.
1- Nutrient in infant food.
2- Diluents, filler or disintegrating agent in tablet
manufacture.
3- Antidote in the treatment of iodine
poisoning.
3 4 October 2015
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Starches Chemical composition of starch:
Starch granules are polysaccharide in nature.
They are composed of two main components:
Amylose Amylopectin
Ratio 20% 80%
Linear chain Branched chain
Solubility
in Water Water soluble Water insoluble
Reaction
to iodine Blue colour Violet colour
4 4 October 2015
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Potato
Starch
Wheat
Starch
Maize
Starch
Rice
Starch
1-Origin Polysaccharide granules obtained from
the stem
tubers of
Solanum
tuberosum
Family
Solanaceae
the endosperm of the grains of
Triticum
vulgare Zea mays Oryza sativa
Family Gramineae
5 4 October 2015
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Potato
Starch
Wheat
Starch
Maize
Starch
Rice
Starch
2- Physical characters:
Fine Powder
White
Smooth
Starchy
Homogenous
Odourless
Smooth
or gritty
-Colour:
-Odour:
-Taste
-Touch:
-Homogenity:
-Condition
6 4 October 2015
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Potato
Starch
Wheat
Starch
Maize
Starch
Rice
Starch
3- Preliminary chemical tests:
a- Effect of
cold water:
b- Effect of
hot water:
Insoluble
Colloidal solution, on cooling forms a
gel
e- Effect of
iodine:
Bluish violet colour Colour disappears
cool Colour reappears
c- Effect of
acids (HCl): Turbid cloudy solution
d- Effect of
alkalies (KOH): Turbid cloudy solution
7 4 October 2015
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Potato Starch Wheat
Starch
Maize
Starch
Rice
Starch
4- Microscopical Examination
1- Shape
-Oval
-Rounded
-Elliptical
-Triangular
-Pyramidal
-Oval
-Rounded
-Lenticular
from side
view
Polyhedral
with
rounded
angles
Polyhedral
with Sharp
angles
(S.V.) 8 4 October 2015
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Potato Starch Wheat
Starch
Maize
Starch
Rice
Starch
2- Size: Large Medium Small
Hilum
Present,
distinct,
eccentric,
pointed
Present,
faint,
centric ,
pointed
(linear in
side view)
Present,
distinct,
centric,
cleft or
fissured
Absent
except
in large
simple
granule
1.5-3 cm 1 cm 0.4 - 0.8 cm 0.2- 0.4 cm
3- Hilum:
Drawing scale
9 4 October 2015
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Potato Starch Wheat
Starch
Maize
Starch
Rice
Starch
4- cont.Microscopical Examination
4-Striations:
Present,
distinct
concentric
rings
Present,
faint
concentric
rings
Absent
10 4 October 2015
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Potato
Starch
Wheat
Starch
Maize
Starch
Rice
Starch
4- cont.Microscopical Examination
5- Aggregation: Simple,
compound (2,3)
semicompound
Mostly simple,
rarely compound
Mostly
compound
, rarely
simple
simple
compound
Semicompound
11 4 October 2015
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Potato
Starch
Wheat
Starch
Maize
Starch
Rice
Starch
5- Confirmatory chemical Test:
1- Molisch’s
Test:
(general test
for
carbohydrates)
Starch susp. + 2-3 dps alcoholic α- naphthol+ 2-3 dps
concentrated H2SO4 on the walls of test tube
Violet ring
2- Fehling’s
Test:
(for reducing
sugars)
Starch suspension + Fehling solution
(blue color) No change in color
Hydrolyzed starch + Fehling solution
(blue color)
red colour
3- Iodine test: As before
12 4 October 2015
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Potato ( Low power) 13 4 October 2015
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Potato (High Power)
Concentric striations
Eccentric hilum
14 4 October 2015
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Potato H.P. pyramidal
oval
triangular
pyramidal
15 4 October 2015
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elleptical
Potato H.P.
oval
16 4 October 2015
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Potato H.P., compound granule (3) Potato H.P.,
compound granule
(2) 17 4 October 2015
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Potato H.P.
semicompound granule
18 4 October 2015
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Potato H.P., Stained with dil. iodine 19 4 October 2015
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Wheat (Low power) 20 4 October 2015
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Wheat H.P. 21 4 October 2015
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Wheat H.P., side view
Linear hilum
22 4 October 2015
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Wheat H.P. 23 4 October 2015
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Wheat H.P., Stained with dil. iodine 24 4 October 2015
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Maize (Low power) 25 4 October 2015
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Maize H.P.
Fissured hilum
Cleft hilum
26 4 October 2015
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Maize H.P., Stained with dil. iodine
27 4 October 2015
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Rice (Low power) 28 4 October 2015
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Rice H.P. 29 4 October 2015
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Rice stained with dil. Iodine
H.P. 30 4 October 2015
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Rice H.P. Maize H.P.
31 4 October 2015