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Technological properties of Lactococcus lactis subsp. lactis bv. diacetylactis obtained from dairy and non-dairy niches

  • Andressa Fusieger
  • Mayra Carla Freitas Martins
  • Rosângela de Freitas
  • Luís Augusto NeroEmail author
  • Antônio Fernandes de CarvalhoEmail author
Food Microbiology - Research Paper
  • 12 Downloads

Abstract

Lactococcus lactis subsp. lactis bv. diacetylactis strains are often used as starter cultures by the dairy industry due to their production of acetoin and diacetyl, important substances that add buttery flavor notes in dairy products. Twenty-three L. lactis subsp. lactis isolates were obtained from dairy products (milk and cheese) and dairy farms (silage), identified at a biovar level, fingerprinted by rep-PCR and characterized for some technological features. Fifteen isolates presented molecular and phenotypical (diacetyl and citrate) characteristics coherent with L. lactis subsp. lactis bv. diacetylactis and rep-PCR allowed the identification of 12 distinct profiles (minimum similarity of 90%). Based on technological features, only two isolates were not able to coagulate skim milk and 10 were able to produce proteases. All isolates were able to acidify skim milk: two isolates, in special, presented high acidifying ability due to their ability in reducing more than two pH units after 24 h. All isolates were also able to grow at different NaCl concentrations (0 to 10%, w/v), and isolates obtained from peanut and grass silages presented the highest NaCl tolerance (10%, w/v). These results indicate that the L. lactis subsp. lactis bv. diacetylactis isolates presented interesting technological features for potential application in fermented foods production. Despite presenting promising technological features, the isolates must be assessed according to their safety before being considered as starter cultures.

Keywords

Lactic acid bacteria Diacetyl Starter culture Technological potential 

Notes

Funding information

CNPq, CAPES (financial code 001), FAPEMIG, and CIRM-BIA for the concession of reference strains.

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Copyright information

© Sociedade Brasileira de Microbiologia 2019

Authors and Affiliations

  1. 1.Departamento de Tecnologia de AlimentosUniversidade Federal de ViçosaViçosaBrazil
  2. 2.Departamento de VeterináriaUniversidade Federal de ViçosaViçosaBrazil

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