2.8. Rheology of yogurt
The rheological assessment of the yogurt samples was carried out
using a rheometer (Brookfield RS, Lab Unlimited, Dublin, Ireland) with
a V-40/20 vane spindle attachment. Yogurt samples were removed
fromrefrigerated storage immediately prior to rheologymeasurements.
The spindle was directly inserted into each yogurt sample, a shear rate
of 0.05 s−1was applied to each sample for 2 min and the shearmodulus
(G) (tendency to deform when acted on by opposing forces) was
measured.
2.9. Sensory analysis of yogurt
Sensory analysis of yogurt was performed as described in O'Sullivan
et al. (2014). Sensory analysis descriptors were colour, texture, odour,
flavour, off-flavour, thickness and overall acceptability.
2.10. Stability and bioactivity of seaweed extract enriched yogurt
2.10.1. Stability of seaweed extracts in yogurt
The stability of seaweed extracts in yogurt samples over the storage
period was determined using the DPPH radical scavenging activity as
described in O'Sullivan et al. (2014). The % DPPH radical scavenging activity
(stability) of yogurts was measured at 7 day intervals up to
28 days of storage