CALCIUM OXALATE CRYSTALS | TYPES | TRICKS & IDEAL METHOD OF STUDY | STAINING REAGENTS PHARMACOGNOSY
Channel: PHARMAROCKS THE WAY OF SUCCESS
Date: 2020-11-14

CALCIUM OXALATE CRYSTALS 
Calcium oxalate crystal formation in plants appears to play a central role 
In a variety of important functions, 
Including tissue calcium regulation, 
Protection from herbivory, and 
Metal detoxification. 
Evidence is mounting to support ascorbic acid as the primary precursor to oxalate biosynthesis.

WHAT ARE CALCIUM OXALATE CRYSTALS 
Calcium oxalate crystals are considered as excretory products of plant metabolism. 
They occur in different forms and provide valuable information for identification of crude drugs in entire and powdered forms.

HERE ARE POPULAR STAINING REAGENT OF CALCIUM OXALATE CRYSTALS 
 1. Acetic acid—Insoluble
 2. Caustic alkali—Insoluble
 3. Hydrochloric acid—Soluble
 4. Sulphuric acid  (60% w/w)—Soluble, on standing  replaced by needles of calcium sulphate.

HOW TO PREPARE SLIDE OF CALCIUM OXALATE CRYSTAL?
By using above suitable reagent prepare slide and check under microscope 

DIFFERENT TYPES OF CALCIUM OXALATE CRYSTALS 
Prism/Single crystals
Cluster Crystals
Rosette crystals
Acicular Crystals/ Raphides
Micro Crystals/ Crystals sand/ Micro sphenoid

PRISMS IN HYOSCYAMUS
CLUSTERS IN STRAMONIUM
MICROSPHENOIDS IN BELLADONNA
ROSETTES IN SENNA
TETRAGONAL CRYSTALS
MICROCRYSTALS’ IN CINCHONA
RAPHIDES IN COCO-YAM
ACICULAR CRYSTAL IN SQUILL

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