2.4. Surface colour measurement of yogurt
The surface colour of yogurt samples was measured by Minolta colorimetry
as described in O'Sullivan et al. (2014).
2.5. Measurement of lipid oxidation in yogurt
Lipid oxidation in yogurt was measured following the procedure of
Fenaille, Mottier, Turesky, Ali, and Guy (2001). Results were expressed
as 2-thiobarbituric acid-reactive substances (TBARS) in mg
malondialdehyde (MDA)/kg yogurt.