type of packaging on flavoured stirred yogurt quality,
whereas fat content and storage time had greater consequences
on physicochemical and sensory properties. The
analyses of the yogurts over the course of time at 4 C
for all kinds of packaging revealed a rapid evolution of
the low-fat yogurts during the first 14 days at the physicochemical
and sensory levels. For the 4%-fat yogurts, a
decrease in fruity notes was observed between the 14th
day and the 28th day of storage. However, less significant
effects were observed for yogurts with 4%-fat content than
for low-fat yogurts. The fat acts as an aroma solvent and
reduces interaction with packaging. Concerning the packaging
effects, polystyrene packaging seems to be preferable
for avoiding the loss of fruity notes for 0% and 4%-fat
yogurts and for limiting the development of odour and
aroma defects, particularly for 4%-fat yogurts. The physicochemical
results (complex viscosity, pH values and aroma release) are in agreement with the sensory properties
of the yogurts.
This study contributes to a better understanding of the
impact of packaging on the physicochemical and sensory
properties. It shows the need for integrating the packaging
type into the formulation of flavoured dairy products, in
particular for low-fat yogurt, even if yogurt has a short
conservation time and is stored at low temperatures.