# How do antioxidants work? [closed]

A friend and I are doing a project that involves the process behind manufacturing Jet A-1 and specifically the specifications highlighted in DEF 91-91. I was interested to see the information at the bottom of page 8.

Specifically:

1. Why are 2,6-ditertiary-butyl-phenol, 2,6 ditertiary-butyl-4-methyl-phenol and 2,4-dimethyl-6-tertiary-butyl-phenol used rather than "more common" antioxidants like ascorbic acid?
2. How do these antioxidants function and do they work any differently to biochemical antioxidants?
3. What factors determine the effectiveness of an antioxidant?
4. Why are a mixture of chemicals used at different ratio's rather than just one. Do they work more/less effectively at different temperatures for example?

2) The molecules mentioned in the provided quote can form stable radicals on loss of $\ce{OH}$ group hydrogen, i.e. act as a radical trap, transforming active radicals into non-active particles. It is a typical mechanism for antioxidants to work.