Add time:07/11/2019         Source:sciencedirect.com

The fluorescence properties of the aflatoxins M1, Q1, P1 in solution and the effect of various cyclodextrins (α-, β-, γ-, hydroxypropyl-β- and α-β-heptakis-di-O-methyl-β-) on their fluorescence emission were studied. Among the aflatoxins, a substantial enhancement of the fluorescence emission of aflatoxin Q1 in the presence of aqueous solutions of α-, β-, hydroxypropyl-β, and α-β-heptakis-di-O-methyl-β-cyclodextrin, was observed. On the contrary, γ-cyclodextrin proved to be inefficient to enhance the fluorescence properties of this compound. No important fluorescence enhancement was found for aflatoxins P1 or M1 for any of the cyclodextrin derivatives tested. The complex formation constant (Kf) of these compounds with β-cyclodextrin was chromatographically determined, and from the results obtained, we can conclude that Kf cannot be used alone to explain the fluorescence increase. Thermodynamic studies showed that ΔH and ΔS parameters, associated with the partition of aflatoxins in RP-HPLC, increased when β-cyclodextrin was added to the eluent.

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