# Tablet Assay Method

I am having Acetaminophen Tablets 100 mg, for that i am doing assay method

As a rule of thumb i have take both standard and samples solution at the same concentration.

As per USP i have make 0.01mg/ml solutions of both Standard and sample.

standard solution[0.01mg/ml] : 10 mg of standard to 100 ml mobile phase [0.1mg/ml]. Then 1 ml of 0.1mg/ml solution to 10ml with mobile phase[0.01 mg/ml].

Then my question is how to prepare 0.01mg/ml sample solution.

Pleas help me

[quote=qtp]I am having Acetaminophen Tablets 100 mg, for that i am doing assay method

As a rule of thumb i have take both standard and samples solution at the same concentration.

As per USP i have make 0.01mg/ml solutions of both Standard and sample.

standard solution[0.01mg/ml] : 10 mg of standard to 100 ml mobile phase [0.1mg/ml]. Then 1 ml of 0.1mg/ml solution to 10ml with mobile phase[0.01 mg/ml].

Then my question is how to prepare 0.01mg/ml sample solution.

Pleas help me[/quote]

Hi friend,

For this you should know the single tablet weight( API+ Excipients)

Take 20 tablets and grind to powder.

Now take an amount that contains 10 mg of API to 100 ml then 1 ml to 10 ml dilute with mobile phase.

Eg: you have a tablet claiming 100 mg of Acetaminophen [ single tablet contins 100 mg of API] and the tablet weight is 200 mg(you have not written the each tablet weight, I assumed 200 mg for each tablet weight].

Sample preparation : 20 mg of grinded powder(It contains 10 mg of API) dissolved in 100 ml, further diluted1 ml to 10 ml.
Regards,
Bujji Kanchi.
+91-8008889185.

Thank you very much