The sensory evaluation of the butter samples during storage on a
scale from 1 (very bad) to 5 (excellent) is presented in radar plots in
Fig. 2. The addition of probiotic strains had no effect on flavour,
structure and general acceptability scores; however, it was determined
that the colour scores were affected by probiotic bacteria at
the P < 0.05 level. The significant colour scores from panellists for
sample B might be attributed to the halo effect. Mann and Sachdeva
(2014) also reported that the colour scores were affected by the
inoculum concentration of probiotic bacteria in yoghurt. On the
other hand, the flavour, structure and general acceptability scores
significantly changed (P < 0.05) throughout the storage period. In
general, the highest scores were obtained on the first day of storage,
followed by a decrease in scores during storage. The total amount of
free fatty acids and the peroxide value may be responsible for the
development of flavour defects in butter during storage . In particular, the shelf-life of fatty dairy
products is affected by these chemical changes through oxidation,
and as a result, show an oxidised flavour defect