Question

Which of the following condition is correct according to lactic acid fermentation?

(a) Both Low temperature and pH

(b) Both High temperature and pH

(c) Low temperature and high pH

(d) High temperature and low pH

This question was posed to me in a job interview.

This interesting question is from Anaerobic Bioprocesses topic in portion Mixed Cultures & Traditional Industrial Bioprocesses of Bioprocess Engineering

Answer 1

Correct choice is (d) High temperature and low pH

To explain I would say: Industrially important homolactics grow at temperatures above 40°C and pH between 5 and 7. High temperature and low pH (pH < 6) reduce the risk of contamination.