Page 478 - Applied Pharmacognosy

• Ignite for 15 minutes at a temp. not exceeding 450˚c .

• Subtract the weight of the insoluble matter from the

weight of the total ash; the difference in weight represent

the water – soluble ash.

• Calculate the % with reference to the air dried drug.

• Total ash, acid - insoluble ash … not more than..

• water – soluble ash … not less than..

12th lectures Evaluation of crude natural drugs for
quality control purposes