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Association of aflatoxin M1 with casein

Verbindung zwischen Aflatoxin M1 und Casein

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Zusammenfassung

Die Gleichgewichtsdialyse wurde benutzt, um festzustellen, ob es eine Bindung zwischen Aflatoxin M1 (AFM1) and Casein gibt. Simuliertes Milchultrafiltrat (SM) mit entweder 10 oder 20 ng von AFM1/ml wurde gegen SM mit Caseinmicellen dialysiert. Nach 24 Std bei 7°C enthielt die Caseinsuspension 2,5- bzw. 2,9-mal so viel AFM1 als SM. Durchschmittlich wurden 17,9 bzw. 55,3 μg AFM1/g Casein gebunden. In einem Einzelexperiment wurde Milch, die natürlich mit AFM, kontaminiert war, mit einem eiweißabbauenden Enzym behandelt. Im Durchschnitt fand man etwa 30,7% mehr Toxin in behandelter als in unbehandelter Milch. Dieses Ergebnis weist auf eine Verbindung zwischen AFM1 and Casein hin.

Summary

Equilibrium dialysis was used to determine whether aflatoxin M1 (AFM1) binds to casein. Simulated milk ultrafiltrate (SMUF) containing 10 or 20 ng/ml of AFM1 was dialyzed against SMUF containing casein micelles. After 24 h at 7°C, the casein suspension contained 2.5- or 2.9-fold, respectively, more toxin than that found in SMUF. An average of 17.9 or 55.3 μg of AFM1, respectively, per gram of casein was bound. In a separate experiment, milk naturally contaminated with AFM1 was treated with a proteolytic enzyme. An average of 30.7% more toxin was found in treated than in untreated milk. This result also suggests binding of AFM1 by milk protein.

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Brackett, R.E., Marth, E.H. Association of aflatoxin M1 with casein. Z Lebensm Unters Forch 174, 439–441 (1982). https://doi.org/10.1007/BF01042721

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