Spoilage Microorganisms in Milk

The microbial quality of raw milk is crucial for the production of quality dairy foods. Spoilage is a term used to describe the deterioration of a foods' texture, colour, odour or flavour to the point where it is unappetizing or unsuitable for human consumption. Microbial spoilage of food often involves the degradation of protein, carbohydrates, and fats by the microorganisms or their enzymes.
Image result for milk bacteriaIn milk, the microorganisms that are principally involved in spoilage are psychrotrophic organisms. Most psychrotrophs are destroyed by pasteurization temperatures, however, some like Pseudomonas fluorescens, Pseudomonas fragi can produce proteolytic and lipolytic extracellular enzymes which are heat stable and capable of causing spoilage.

Some species and strains of Bacillus, Clostridium, Cornebacterium, Arthrobacter, Lactobacillus, Microbacterium, Micrococcus, and Streptococcus can survive pasteurization and grow at refrigeration temperatures which can cause spoilage problems.

Related Posts:

  • F-Plasmids and Sexduction Just as F-plasmids can be integrated into the chromosome, so they can also be occasionally excised from the Hfr-chromosome to produce a free plasmid. Sometimes, the excision does not occur in a precise manner by exact rever… Read More
  • Dimorphic Fungi Fungi can be broadly classified into two groups;  yeasts and molds. Yeasts are single celled  organisms that reproduce by budding but molds grow as filaments like structure. Many medically important fungi show… Read More
  • Restricted Transduction of Bacterial genome  Restricted transduction is mediated by certain temperate bacteriophages, like the λ-phage (lambda phage) of E. coli, which enters into a lysogenic relationship with the host bacterium. This type of phages normally doe… Read More
  • Features of interrupted mating between Hfr x F– cells of E. coli The important features of interrupted mating between Hfr x F– cells of E. coli are briefly mentioned below: (a) Transfer of Hfr chromosome to P cell begins at a particular point on chromosome determined by the site of… Read More
  • Transformation of bacterial genome Historically, the discovery of transformation in bacteria preceded the other two modes of gene transfer. The experiments conducted by Frederick Griffith in 1928 indicated for the first time that a gene-controlled characte… Read More

1 Comments:

uilleakaaker said...

Jammin' Jars Casino Tickets - Jackson's Hotel & Casino
Buy Jammin' 충주 출장샵 Jars Casino tickets 수원 출장안마 at Ticketmaster.com. Find Jammin' Jars Casino venue concert and event schedules, venue information, 충청북도 출장마사지 directions, Thu, Dec 16Miss America 인천광역 출장샵 Pageant Sun, Dec 익산 출장마사지 18Basketball Hall Of Fame

Powered by Blogger.

Visitors

224478
Print Friendly Version of this pagePrint Get a PDF version of this webpagePDF


 download University Notes apps for android

Popular Posts

Flag Counter