Trimethylsilyl speciations of cathine, cathinone and norephedrine followed by gas chromatography mass spectrometry: Direct sample preparation and analysis of khatamines

•Cathine, CAT/norephedrine, NE/cathinone, CTN were oximated then trimethylsilylated at first.•MSTFA applied in parallel with MSTFATMIS led to distinguishable new informations.•MSTFATMIS provides CAT-3TMS, NE-3TMS, CTN-2TMS(TMS-oximes)1,2 partly stable products.•MSTFA gives CAT-2TMS, NE-2TMS, CTN-TMS...

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