Pyrolysis gas chromatography mass spectrometry (Py/GC/MS) is an instrumental method that enables a reproducible characterisation of the intractable and involatile macromolecular complexes found in virtually all materials in the natural environment. It differs from GC/MS in the type of sample analysed and the method by which it is introduced to the GC/MS system. Instead of the direct injection of a highly refined organic solution, a few mg (or in the case of materials with a high organic carbon content, For some macromolecules it is desireable to introduce a chemical reagent that, upon heating, will react with the macromolecule in a more directed manner, e.g. the preferential cleavage of ester domains, to produce a mixture of derivatized low molecular weight moieties in a process know as thermally assisted chemolysis. Typical reagents that are used include tetramethylammonium hydroxide (TMAH) and trimethylsufonium hydroxide (TMSH).
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