Derivatization of isothiocyanates and their reactive adducts for chromatographic analysis.
Isothiocyanates form adducts with a multitude of biomolecules, and these adducts need analytical methods. Likewise, analytical methods for hydrophilic isothiocyanates are needed. We considered reaction with ammonia to form thiourea derivatives. The hydrophilic, glycosylated isothiocyanate moringin, 4-(α-L-rhamnopyranosyloxy)benzyl isothiocyanate, was efficiently derivatized to the thiourea derivative by incubation with ammonia. The hydrophobic benzyl isothiocyanate was also efficiently derivatized to the thiourea derivative. The thiourea group provided a UV absorbing chromophore, and the derivatives showed expectable sodium and hydrogen adducts in ion trap mass spectrometry and were suitable for liquid chromatography analysis. Reactive dithiocarbamate adducts constitute the major type of reactive ITC adduct expected in biological matrices. Incubation of a model dithiocarbamate with ammonia likewise resulted in conversion to the corresponding thiourea derivative, suggesting that a variety of matrix-bound reactive isothiocyanate adducts can be determined using this strategy. As an example of the application of the method, recovery of moringin and benzyl isothiocyanate applied to cabbage leaf discs was studied in simulated insect feeding assays. The majority of moringin was recovered as native isothiocyanate, but a major part of benzyl isothiocyanate was converted to reactive adducts.
['Agerbirk|Niels|N|', 'De Nicola|Gina Rosalinda|GR|', 'Olsen|Carl Erik|CE|', 'Müller|Caroline|C|', 'Iori|Renato|R|']
D002851:Chromatography, High Pressure Liquid D002853:Chromatography, Liquid D008401:Gas Chromatography-Mass Spectrometry D006031:Glycosylation D017879:Isothiocyanates D015394:Molecular Structure D053719:Tandem Mass Spectrometry D013859:Thiocarbamates D013890:Thiourea
Isothiocyanate Thiourea Liquid chromatography Dithiocarbamate Recovery MS NMR Tandem mass spectrometry UV-detection