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Controlled release of nisin from Neusilin particles to enhance food safety of sour curd cheese

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Nisin is frequently added as food additive to soft cheese to increase food safety against foodborne pathogens like Listeria monocytogenes. The goal of this study was the extension of the antimicrobial activity of nisin in sour curd cheese (SCC) by self-releasing adsorbed nisin from Neusilin UFL2 over production-based pH shift. First, the antimicrobial activity of nisin adsorbed to Neusilin UFL2 (UFL2-N) and free nisin was investigated in BHI broth at a pH range from 7.5 to 4.5 for each of six L. monocytogenes field isolates. UFL2-N showed similar minimal inhibition concentration to L. monocytogenes over time as free nisin. Distribution of nebulized, fluorescence-labelled UFL2 was homogenous on SCC surface. Thereafter, SCC surface was inoculated with L. monocytogenes and 0.004, 0.013, 0.026, and 0.132 mg mL−1 UFL2-N or free nisin. In SCC, L. monocytogenes was below quantification limit at 0.132 mg mL−1 UFL2-N or free nisin after 2 days of ripening. Collectively, UFL2-N enabled a slow release and antilisterial activity in vitro as well as in cheese manufacturing.

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This research was financially supported by Federal Ministry for Economic Affairs and Energy on the basis of a decision by the German Bundestag (KF3083302SK3) and technical alliance Oberfranken (TAO).

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Correspondence to Matthias Noll.

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Szendy, M., Westhaeuser, F., Baude, B. et al. Controlled release of nisin from Neusilin particles to enhance food safety of sour curd cheese. J Food Sci Technol 56, 1613–1621 (2019).

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