How Do Enzymes Influence Yoghurt Production from Milk?

[Paulie :)]

Assignment due tomorrow & virus has deleted everything please help.

AIM:
To investigate the role of enzymes in the production of yoghurt from milk.

I need full in depth information on the process of production in yoghurt.

 

[Borek]

Try to remember what was in the files deleted, and where did you get the information from. If you were ready, that won't be difficult.

 

[Paulie :)]

Yeah I was given this assignment 2 months ago and finished it last month. So it's been a while and I have 2 other assignments I am trying to finish at the moment. But yeah I know.

 

[Paulie :)]

panicking sooo much right now. just found some sites but I am not even half way through

 

[Paulie :)]

role of enzymes in the production of yoghurt from milk

The basic process by which milk is transformed into yogurt is fermentation. Several species of bacteria can be used for yogurt production Lactobacillus bulgaricus, Lactobacillus acidophilus and Streptococcus thermophilus.

When the aforementioned bacteria are added to milk, they can take up the lactose and split it into simpler sugars such as glucose. Glucose is then fermented to lactic acid, so yogurt bacteria are often classified as lactic acid bacteria. This can occur by 2 biochemical pathways (named homofermentative or heterofermentative) and it occurs because oxygen is depleted in the yogurt culture. Now, lactic acid (also called lactate) is not good for bacteria, so they excrete it into their environment. This causes the pH to fall and protein molecules in the milk become denatured.

The bacteria produces the enzymes? And I am still not sure of the whole process in which yoghurt is formed. I'm looking for in depth information that clarifies specifically what is occurring.

 

[Ouabache]

Welcome Paulie to PF forums! If you haven't had a chance to look around yet, I believe you will find lots of useful information here as well as knowlegeable members who can help you. As this is a school assignment, you probably want to post it in our subforum
(Physics Forums > Science Education > Homework & Coursework Questions > Other Sciences). I see you have made a https://www.physicsforums.com/showthread.php?t=505501" on this. I will make a request to merge it there.

I notice you've also read an https://www.physicsforums.com/showthread.php?t=67626" where I posted information about yogurt bacteria and enzymes.

As you're making an in-depth study, I would not rely on the internet as your sole source of information. As good as it is, the internet is no substitution for a school or public library. You will find some information on the net. You might conduct a net search using key words from my earlier discussion, for example: "yogurt bacteria, enzyme, β-galactosidase" As you probably are aware, not all websites have reliable information. To help sift through the myriad of websites, I would pay closer attention to those having .edu, .gov, or .us in their identifier (URL). (I've already done this and see at least one good site with detailed information yogurt formation).

Sorry I could not assist you sooner. Hopefully this information will still be useful to you.

 

[Paulie :)]

No, that's fine. Thank you so much! I've read a couple of books and looked up the two books that you recommended to the previous person.

Thanks again!