dairy Microbiology

5 posts / 0 new
Last post
afreen 00
afreen 00's picture
dairy Microbiology

hey, i m working in a well known dairy industry as a trainee. i wanaa know that , is UHT treated milk is totally free of bacteria??
i had run the sampleof UHT treated milk of other company, in SPC , using.EMB AGAR . nad after the due time of incubation it gives pinkish purple fish eye colonies. which is according to my preliminuary thought, E.Aerogenes.
i wanaa know is that possible UHT treated milk contain this organism or it is just my handling error??? please do give me your valuable  replies. AS SOON AS POSSIBLE

vikrant
vikrant's picture
Enterococcus may be found in

Enterococcus may be found in milk after ultra high treatment.. not only Enterococcus but many other heat tolerant species of other bacteria like Bacillus, Pseudomonas, Hafnia can grow in uht milk and spoil it.

afreen 00
afreen 00's picture
but uht is a very high

but uht is a very high temperature treatment of milk, and probably microrganisms kill by it. juxt chances of spore my b present in some cases of production line problem, or quality or sanitary condition of area??  dont u think so??

vikrant
vikrant's picture
 Enterococci can survive HTST

 Enterococci can survive HTST... i.e. 72 degree for 15 secs. specially enterococcus durans.  Though the studies says its hardly in detectable counts. Enterococcus durans is one of the most heat resistant nonsporlating bacteria. If the milk treatment in your industry goes through various steps of heating then the contamination is probably post-treatment. coz several heat treatment surely kills all the nonsporulating bacteria... please follow the post heat treatment procedure to check the source of contamination.

afreen 00
afreen 00's picture
 well, we have very effective

 well, we have very effective and secure treatment plants here , and for check ,i had also done environmental test samlings but didnt detect those organism again in our palnt products. 
but as i microbiologist i was realy concerned about that , other sample which i had processsed. 
Thankx alot for guiding me .