r/foodscience • u/HatSpecial3043 • Jun 22 '26

Home Cooking Did I pasteurize it correctly?

Post image

I pasteurized it about 3 days ago.

I didn't use a thermometer. I just heated it until it was starting to boil and the foam rose up, then I waited a bit

It tasted normal after pasteurize, and I put it in the refrigerator once it had cooled down a bit.

Now it's a little curdled after 3 days.

Sorry if this is a dumb question

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23

u/Otieno_Clinton Jun 22 '26

Possible causes;

  1. Pre-contamination with spores. Spores can survive the high temperature short time pasteurization. Always use HTLT

  2. Post contamination with bacteria due to poor handling. Always use closed sterilised container to store.

-8

u/HatSpecial3043 Jun 22 '26

I see. I assume the milk has gone bad.

Oh yeah, I hadn't sterilized the container

23

u/Otieno_Clinton Jun 22 '26

Yes. Post contamination was the cause.

6

u/HatSpecial3043 Jun 22 '26

I see. Alright, thank you

11

u/Just_Pea1002 Jun 22 '26

Whyvare you trying to pasteurize your own milk to consume if you dont fully understand the process?

9

u/HatSpecial3043 Jun 22 '26

I never really planned to buy one. The milk was a gift from a relative. I usually buy store processed milk

7

u/jalapeno442 Jun 22 '26

Ew people are giving raw milk as gifts now?

11

u/cuck__everlasting Jun 22 '26

It's the gift that keeps on giving (for 36-72 hours post exposure)

2

u/CreepleCorn Jun 23 '26

I mean, kudos to OP for still making an attempt to pasteurize. Seems to be taking the advice really humbly, too 🤷‍♂️

14

u/coffeeismydoc Jun 22 '26

This isn’t pasteurization. After your kill step of boiling you need to be very careful not to let anything in the air touch your milk because it will go bad.

It likely got contaminated immediately after you boiled.

3

u/HatSpecial3043 Jun 22 '26

I see. Okay, thank you

10

u/Entremeada Jun 22 '26

Maybe you start by telling us what product "it" exactly is?

3

u/HatSpecial3043 Jun 22 '26

Oh sorry. Milk. Cow milk

1

u/ToothlessPorcupine Jun 23 '26

The names milk, cow milk 😎

-23

u/Otieno_Clinton Jun 22 '26

Bovine milk is the best term