Page 475 - Applied Pharmacognosy

Sulphated ash
• Sulphated ash involves treatment of the drug

• with dil. H2SO4 before ignition.

• So, all oxides & carbonates are converted to sulphates
and ignition is carried out at higher temperature (600 -
800ºc).

B . Acid – insoluble ash

The majority of drugs contain Ca oxalate, in variable
amounts.

• The total ash of these drugs vary within wide limits.