The effect of Isabel (IGE) and Niagara (NGE) grape seed and peel extracts on lipid oxidation, instrumental colour, pH and sensory properties of raw and cooked processed chicken meat stored at -18°C for nine months was evaluated. The pH of raw and cooked samples was not affected by the addition of grape extracts. IGE and NGE were effective in inhibiting the lipid oxidation of raw and cooked chicken meat, with results comparable to synthetic antioxidants. The extracts caused alterations in colour, as evidenced by the instrumental (darkening and lower intensity of red and yellow colour) and sensory results of cooked samples. In the sensory evaluation of odour and flavour, IGE produced satisfactory results, which did not differ from synthetic antioxidants. These findings suggest that the IGE and NGE are effective in retarding lipid oxidation of raw and cooked chicken meat during frozen storage.

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The effect of expectation on the acceptability of four types of yoghurt-like fermented soyamilk was studied among fifty-three subjects. Overall liking was rated under three conditions: (1) blind test (B); (2) expectations created by nutritional and health claims about the products (E) and (3) subjects re-tasted the beverages, having the nutrition and health claims available (R). Student's t-tests performed on data indicated no significant differences (P > 0.05) between acceptance levels under the blind (B) and real (R) conditions, although expectation ratings (E) were significantly higher (P < 0.05) than (B) and (R). However, linear regression of (R ) C) · (E ) C) ratings for each sample revealed a major assimilation effect of expectation, especially under negative disconfirmation (when the product was evaluated as worse than expected). Contrast effect was also observed, but to a lesser extent. In conclusion, information influenced positively on the acceptance, although such influence was limited by the subjects' sensory experience.