Page 29 - final Practical handout PG 303-Cogno-2- 2024-2025
P. 29
Clinical Pharm D Level 2 Pharmacognosy-2 (PG 303)
Item Hyoscyamus Mentha Thymus
Type Isobilateral Dorsiventral Dorsiventral
Epidermis Wavy Wavy anticlinal wavy anticlinal
anticlinal walls walls showed walls, covered with
and anisocytic diacytic stomata. striated cuticle (c.f.
stomata. Mentha), bear
diacytic stomata.
a-Branched a- Capitate type. a- orange red
b- Labiaceous labiaceous
Glandular b-non type. b- Capitate
Microscopical Trichomes branched
characters multicellular bent unicellular,
c-clavate uniseriate bicellular non-
glandular hairs
Non Ca.Ox absent Ca.Ox absent
glandular -
Trichomes
bicollateral
V.B. with
Notes perimedullary
phloem.
Item Hyoscyamus Mentha Thymus
Chemical tests
Vitali’s test for Peppermint oil (3 Thyme oil (3
solanaceous
alkaloids drops) + glacial drops) + glacial
Powder + dil. HCl,
boil, filter, filtrate acetic acid acetic acid
evaporate to (3ml) + H2SO4
dryness+ HNO3, containing 0.3%
evaporate + alc. (6 drops) +
KOH, violet color. HNO3 (5ml), heat
for 5 min, blue HNO3 (1 drop),
color fade to deep bluish
green color.
yellow.
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