Prochazka reagent

Fomaldehyde (Marquis [ii] and Prochazka reagent), furfural, 4-methoxybenzalde-hyde, 4-(dimethylamino)-cinnamaldehyde and 4-(dimethylamino)-benzaldehyde (Ehrlich s, Van Urk s, Morgan-Elson or EP reagents) react according to this scheme with... 

Iodides Cinnamaldehyde/hydrochloric acid 4-N,N- dimethylaminocinnamaldehyde Ehrlich reagent Ferric chloride (0.001 M) in 5% perchloric acid Naphthoquinone/perchloric acid Perchloric acid (5%)/ferric chloride (0.001 M) Prochazka reagent Salkowski reagent van Urk (or Stahl) reagent Xyanthydrol (0.1% in acidified ethanol) Sonnenschein test... 

SEHiER et al. [110] describe a direct quantitative determination of anthranilic acid and some indole derivatives, without elution. Layers on 5 X 20 cm plates were chromatographed using solvent XIV, Table 89, sprayed with the Prochazka reagent (No. 123, Table 88), illuminated with UV light of wave-length 365 nm and the fluorescence measured with a slightly modifled Zeiss-Spektralphotometer PMQ II (Firm 155). The surface areas under the lines registered with a recorder were found to be directly proportional to the amount of material between 10 and 2000 ng. A TLC-attachment for the Zeiss Spektralphotometer has been developed with which direct routine qualitative and quantitative measurements on normal TLC-plates have become possible [41, 42]. 

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