Science Buddies: "Ask an Expert"

Hi,
I was wondering if the nutrient broth used to grow lactobacillus's pH could be changed from 6.9 to 6.8 for example.
I wanted to see if changing the acidity of the broth would affect the probiotics growth rate, modeling the stomach acid. Thanks
scienceperson222

Hi scienceperson222,

This is an excellent science fair topic! I have posted my suggestions for your project below.

Changing the pH of the nutrient broth from 6.9 to 6.8 is a very subtle change, and may not generate data that could suggest a difference in growth rates. Instead, try changing the pH of the broth from 6 to 7 or 6 to 5. It's important to change the acidity of the broth with pH 1 intervals if you want significant results.

I hope this helps!
CMS

Hello,
Thanks a lot for the feedback! This really helped
Thanks,
scienceperson222