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Kraus L, Stahl E, Thies W, Arnold W. 
“Dünnschichtchromatographie von illegalen LSD-Präparaten und die Möglichkeit einer Direktauswertung im Nanogrammbereich”. 
Planta Med.. 1977;32A(1):24.
A TLC method for the determination of nanogram quantities of LSD in illegal preparations is described. Lysergic acid derivatives were isolated from various dispensation forms (felt, blotting paper, cigarette paper, sugar) by means of a micro-column. Conditions for the separation were optimized using a pH-gradient layer and isopartitive solvents, first for conventional layers and then for application to nano-TLC-plates. A neutral solvent mixture consisting of methanol and chloroform gave the best results Detection limit was 1 ng and direct quantitation at 410 nm was possible in the range 5-10 ng with a relative standard deviation of 2-4%. Statistical evaluation was carried out on 100 different 'felt-trips' of a confiscated batch.
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