Determination of Ash value of Crude Drug with Calculation | Ash Value Determination Method- English

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ASH VALUE DETERMINATION
Ash values are helpful in determining the quality and purity of crude drugs, especially in powder form. The objective of ashing vegetable drugs is to remove all traces of organic matter, which may otherwise interfere in an analytical determination. On incineration, crude drugs normally leave an ash usually consisting of carbonates, phosphates and silicates of sodium, potassium, calcium and magnesium.

At the last of this video, you will be able to answer- what is ash value, how to determine ash value, the importance of ash value, how to find ash value of any crude drug, ash value of the crude drug,

Determination of ash
1. Place about 3 g of the ground material, accurately weighed, or the quantity specified in the monograph, in a suitable tared dish (for example, of silica or platinum), previously ignited, cooled and weighed.
2. Incinerate the material by gradually increasing the heat, not exceeding 450 °C, until free from carbon; cool, and weigh.
3. If a carbon-free ash cannot be obtained in this way, exhaust the charred mass with hot water, collect the residue on an ashless filter-paper, incinerate the residue and filter-paper, add the filtrate, evaporate to dryness, and ignite at a temperature not exceeding 450 °C.
4. Calculate the content in mg of ash per g of airdried material.

Determination of acid-insoluble ash
1. Boil the ash for 5 minutes with 25 mL of hydrochloric acid (~70 g/l) TS; collect the insoluble matter in a sintered crucible, or on an ashless filter-paper, wash with hot water, and ignite at about 500 °C to constant weight.
2. Calculate the content in mg of acidinsoluble ash per g of air-dried material.

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