Hello dear, if the thermal stability of the lignin is different than those of the cellulose and the inflection points (graph weight vs temperature) for every one of them have good resolution, you can make that determination from TGA, in opposite case it is not possible.

If the first case is true, you can find the weight loss for every component and from it determines the composition, since you know the mass used for making the analysis.

Hi Edwin,

Thanks for your response. It helped me to deduce an approximate value of cellulose and lignin which lies in the similar region of published values. Though, I am unable to make a distinction in amount of hemi-cellulose present. Could you please provide me a journal paper(s) which has discuss this methodology in detail?

Thanks.

rw