The addition of GSE exerted a greater effect, compared
to BB, on the colour stability of cooked pork patties stored
for up to 4 days at 4 C. Addition of GSE (1000 lg/g), significantly
increased (P < 0.05) the ‘a’ redness values of
cooked pork patties, relative to controls, over the 4-day
storage period (Table 4). This increase in colour was not
perceived as negative by the in-house sensory panel with
respect to overall product quality. By contrast, Mitsumoto,
O’Grady, Kerry, and Buckley (2005) reported that addition
of tea catechins (200 or 400 lg/g) resulted in discoloration
of cooked beef and poultry patties. Monomeric phenolic
compounds such as catechins and epicatechin are present
in GSE however their concentration may not be sufficiently
high enough to cause discoloration in cooked pork.
Addition of GSE (400 and 1000 lg/g) and BB (80 and
1000 lg/g) did not significantly affect the sensory scores
of cooked pork patties for any of the quality attributes
tested (data not shown). In general, sensory scores assigned
by panelists decreased marginally over the 4 day storage
period for parameters such as colour (5.1–4.0), flavour
(5.9–3.6), tenderness (5.8–3.9) and juiciness (8.1–4.0), however,
trends observed were not statistically significant. Similarly
no antioxidant concentration · time interaction was
observed. Sensory scores for off-flavours ranged from
1.0–1.6 over the storage period. It was concluded that addition
of GSE and BB did not adversely affect the sensorial
properties of cooked pork patties at the levels employed
in the present study