Original scientific paper

https://doi.org/10.2478/aiht-2018-69-3160

Removing aflatoxin M1 from milk with native lactic acid bacteria, centrifugation, and filtration

Željka Kuharić ; Andrija Štampar Teaching Institute for Public Health1, Zagreb, Croatia
Željko Jakopović orcid.org/0000-0001-6448-484X ; University of Zagreb, Faculty of Food Technology and Biotechnology2, Zagreb, Croatia
Iva Čanak orcid.org/0000-0003-0973-138X ; University of Zagreb, Faculty of Food Technology and Biotechnology2, Zagreb, Croatia
Jadranka Frece ; University of Zagreb, Faculty of Food Technology and Biotechnology2, Zagreb, Croatia
Jasna Bošnir orcid.org/0000-0002-9877-2927 ; Andrija Štampar Teaching Institute for Public Health1, Zagreb, Croatia
Željka Pavlek ; Andrija Štampar Teaching Institute for Public Health1, Zagreb, Croatia
Martina Ivešić orcid.org/0000-0003-1405-6526 ; Andrija Štampar Teaching Institute for Public Health1, Zagreb, Croatia
Ksenija Markov orcid.org/0000-0001-9188-366X ; University of Zagreb, Faculty of Food Technology and Biotechnology2, Zagreb, Croatia

Abstract

In order to minimise human exposure to aflatoxin M1 (AFM1) the levels of this highly carcinogenic mycotoxin in milk, heat-treated milk, and other dairy products have been limited to <0.05 μg kg-1. However, its removal from dairy products presents a challenge for dairy producers, as commercial additives change organoleptic properties, and filtration alone yields poor results. The aim of this study was to find a strain of lactic acid bacteria (LAB) from milk or dairy products that most effectively binds AFM1 and to see whether heat treatment of the selected LAB affects the binding efficiency. We also wanted to investigate whether centrifugation can improve filtering of the obtained AFM1-LAB complexes from milk. To do that, we isolated and identified 10 native LAB species/strains, incubated their viable or heat-treated cells (108 CFU mL-1) in milk spiked with 0.5 μg L-1 of AFM1 at 4 °C for 0, 2, 4, and 24 h, and quantified the amount of unbound AFM1 with HPLC. AFM1 binding efficiency ranged from 21 to 92 % for viable cells and from 26 to 94 % for the heattreated ones. Since both viable and heat-treated Lactobacillus plantarum KM showed the best results, we used it for the next step in AFM1 removal from milk. Heat treatment in combination with filtration and centrifugation yielded removal as high as 96 %.

Keywords

HPLC; lactic acid bacteria; L. plantarum KM; secondary fungal metabolites; viable and heat-treated cells

Hrčak ID:

213655

URI

https://hrcak.srce.hr/213655

Publication date:

20.12.2018.

Article data in other languages: croatian

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