Calcium oxalate crystals in Crude drug Evaluation Chromatographic and Spectroscopic correlations: A comprehensive Review

Calcium oxalate crystals have diagnostic value, the presence and absence of crystals; their dimensions are of great importance in the identification of the crude drugs. Calcium oxalate is the most abundantly present biomineral in higher plants. The crystals of calcium oxalate are found in a variety of defined shapes in higher plants such as raphide druse, styloid, prismatic and sand crystals. Calcium oxalate crystals have diagnostic value, the presence and absence of crystals; their dimensions are of great importance in the identification of the crude drugs. It also helps in the detection of adulterants in herbal drug and in taxonomical identification. The light microscope was calibrated at10X using an Ocular and Stage micrometry. Value of 1 division = Stage Division ×10 / Ocular division. Divisions that coincided were taken and used for calibrating of the microscope.