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The 16S rDNA of six psychrotrophic Enterobacteriaceae isolated from cold raw milk were sequenced and the isolate 039 was identified as  Pantoea  sp., isolates 059, 068, and 071 were identified as  Hafnia alvei , 067 was identified as  Enterobacter  sp., and 099 was identified as  Aeromonas hydrophila . They presented different spoilage potentials in milk with  A. hydrophila  099 being the most deteriorative. Only  Pantoea  sp. 039 was not able to induce the quorum sensing monitor strains of acyl homoserine lactones (AHLs). The  halI  gene, which encodes the AHL synthase in  H. alvei , was identified in the isolates 059, 067, 068, and 071. After initial sequencing characterization and cloning, this gene showed its function by the heterologous synthesis of N-hexanoyl-DL-homoserine lactone and N-3-oxohexanoyl-L-homoserine lactone in  Escherichia coli . In addition to producing AHLs,  A. hydrophila  099 produced AI-2 in higher level than the assay's positive control  Vibrio harveyi  BB120. Therefore, Enterobacteriaceae strains isolated from cooled raw milk produce a rich array of signaling molecules that may influence bacterial traits in the milk environment.

Quorum Sensing and Spoilage Potential of Psychrotrophic Enterobacteriaceae Isolated from Milk