Milk spoilage is caused by the presence of proteolytic enzymes produced by Pseudomonas spp. during storage at low temperatures. The aim of this study was to identify Pseudomonas spp. in raw milk and investigate their associated proteolytic properties at low temperatures. Raw milk samples (n = 87) were collected from 87 bulk tanks in Shaanxi Province in China. Pseudomonas spp. were identified us...

Thermoduric bacteria are organisms capable of surviving the industrial pasteurization process of milk, and can carry over into product causing quality defects, or creating health hazards. The various species of genus Bacillus, Microbacterium, Micrococcus, Enterococcus, Lactobacillus and Corynebacterium are described as heat resistant species (Marth and Steele, 2001). A thermoduric bacterium in ...

Psychrotrophic bacteria in raw milk are most well known for their spoilage potential and cause significant economic losses in the dairy industry. Despite their ability to produce several exoenzyme types at low temperatures, psychrotrophs that dominate the microflora at the time of spoilage are generally considered benign bacteria. It was recently reported that raw milk-spoiling Gram-negative-ps...

Cells of La<:tobacillus lactis from frozen concentrated cultures were added to refrigerated raw milk to determine their effect on growth of psychrotrophic spoilage bacteria in the milk during storage at 5 or 7 C. Some strains of L. lactis were significantly inhibitory at both temperatures. 1\\'0 selected strains of L. lactis were added along with potassium sorbate to refrigerated raw milk store...

Microorganisms have been empirically used since ancestral times to produce fermented dairy products from milk. In the actual dairy industry, milk is subjected to large scale fermentation processes that involve microorganisms mostly belonging to the Lactic Acid Bacteria (LAB) group. Bacteriophages that infect LAB have been claimed as one of the principal sources of fermentation failure (spoilage...

Here, we review what is known about the microorganisms present in raw milk, including milk from cows, sheep, goats and humans. Milk, due to its high nutritional content, can support a rich microbiota. These microorganisms enter milk from a variety of sources and, once in milk, can play a number of roles, such as facilitating dairy fermentations (e.g. Lactococcus, Lactobacillus, Streptococcus, P...

In general, the quality of raw milk and of dairy products has been considerably improved by the refrigeration on farms, and in processing plants. Unfortunately, the current practices for the collection and the storage of the raw milk favour the growth of psychrotrophic bacteria, able to grow below 7°C, regardless of their optimal growth temperature. Besides their rapid growth ability in refrige...

Milk is a nutritious perishable product having short shelf-life owing to the occurrence of spoilage bacteria in it. This has led an increasing demand for ensuring safety through milk processing. Conventional techniques (such as heat treatment) increase but damage nutritional and sensory qualities milk. Hence, there need develop innovative, nonthermal processing that while preserving its quality...