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  • Effect of a nisin‐producing...
    Ávila, Marta; Gómez‐Torres, Natalia; Gaya, Pilar; Garde, Sonia

    International journal of food science & technology, October 2020, Letnik: 55, Številka: 10
    Journal Article

    Summary Clostridium tyrobutyricum causes swelling, cracks and off‐flavours of cheeses (late blowing defect, LBD) due to butyric acid fermentation. To control this spoilage bacterium, we investigated the use of nisinogenic Lactococcus lactis subsp. lactis INIA 415 as starter in cheeses contaminated with C. tyrobutyricum spores. Control cheese made with spores showed LBD after 14 days of ripening. However, in cheese made with the bacteriocin producer and spores, in which (unlike control cheese) bacteriocin activity was detected throughout ripening, LBD occurred after 21 days. At this stage, level of lactic acid was 1.22‐fold higher (P < 0.01) and concentrations of propionic and butyric acids were 2.15‐ and 2.32‐fold, respectively, lower (P < 0.01) in cheese made with the nisin producer than in control cheese, according to the less pronounced spoilage symptoms showed by the former cheese. The bacteriocin producer delayed the appearance of LBD, although it cannot arrest completely C. tyrobutyricum growth. Late blowing defect is one of the major causes of microbial spoilage in semi‐hard and hard cheeses, resulting in texture and flavour defects, with an unfavourable economic impact on cheese production. In this study, the use of L. lactis subsp. lactis INIA 415 in cheese manufacture delayed late blowing defect appearance and diminished spoilage symptoms.