Natalia Cernei, Zbyněk Heger, Pavel Kopel, Ondřej Zítka, Vojtěch Adam, René Kizek
Biogenic amines (BAs) are basic nitrogenous low mass compounds with aliphatic (spermine, spermidine, putrescine, cadaverine), heterocyclic (e.g. tryptamine, histamine) or aromatic (e.g. tyramine) structure derived mainly from the decarboxylation of amino acids 1. They may be formed by the action of yeast, lactic acid bacteria or other microorganisms during alcoholic and malolactic fermentation 2.
Most of BAs have strong physiological effects and play important biological role as source of nitrogen and precursors for synthesis of broad spectrum of biomolecules, such as hormones or nucleic acids 3. On the other hand BAs have been widely studied as potentially toxic substances, since excessive intake of BAs manifests as food poisoning 4. Moreover, BAs are potential precursors for the formation of carcinogenic N-nitroso compounds 5.
In order to determine the concentrations of biogenic amines in biological matrices, techniques providing high resolution and sensitivity are demanded. To determine BAs is challenging because of strong polarity and no natural UV absorption nor fluorescence. Thus BAs must be pre or post-column derivatized before detection 6. Magnetic separation may be employed for isolation of a sample from complicated biological matrixes (food, body fluids) and may thus form the first separation and pre-concetration step prior to analysis to enhance an applied methodological approach 7.
The main aim of the present study is synthesis of nanomaghemite core and its functionalization with ion-exchange resins (Dowex and sulfoxyethyl cellulose), which can provide binding sites for chosen BAs (Tyramine-Tyr; Putrescine-Put; Histamine-His; Cadaverine-Cad, Spermine-Spm and Spermidine-Spd respectively). Synthetic particles were finally employed for isolation and subsequent analysis by using ion-exchange chromatography.
Figure 1: Chromatogram of mixture of six biogenic amines (His, Tyr, Put, Cad, Spm, Spd) in final concentration of 100 µg.mL-1, obtained by using ion-exchange liquid chromatography with Vis detection in wavelength of 570 nm.
Figure 2: The chromatogramms of biogenic amines (100 µg.mL-1) corresponding to (A) spermine isolated by using MAN21, (B) tyramine isolated by using MAN21, (C) putrescine isolated by using MAN21, (D) spermidine isolated by using MAN1, (E) histamine isolated by using MAN21 and (F) cadaverine isolated by using MAN21, with expression of their retention times. All records were obtained by using ion-exchange liquid chromatography with Vis detector (440 nm).
Figure 3: Expression of binding recovery of all of six biogenic amines (His, Tyr, Put, Cad, Spm, Spd) after isolation on paramagnetic particles (A) MAN21 and (B) MAN1. Biogenic amines (100 µg.mL-1) were isolated following optimized conditions and recovery was calculated from quantification of biogenic amines carried out on ion-exchange liquid chromatography.
1. Mayer, H.K.; Fiechter, G.; Fischer, E., A new ultra-pressure liquid chromatography method for the determination of biogenic amines in cheese. Journal of Chromatography A 2010, 1217, 3251-3257.