ANTIOXIDATIVE EFFECTS OF POMPOSIA EXTRACT, ON LIPID OXIDATION AND QUALITY OF GROUND BEEF DURING REFRIGERATED STORAGE

The aim of the current investigation was to investigate the effect of pomposia juice and extracts compared to BHT as synthetic antioxidant on lipid oxidation and quality of ground beef during refrigerated storage at 0°C± 0.5°C for up to 10 days. The extracts and BHT were mixed with minced beef at 0.5, 0.75 and 1.00 % (W/W). TBA test as quality assurance test was conducted at the beginning of the experiment and after 2, 4, 6, 8, and 10 days of storage experiment. The results of this study showed that the crude juice and ethanolic extract of Kaatha variety had significantly (P<0.05) the highest levels of total polyphenols and antioxidant activity. The most effective radical scavenging activity was showed by crude juice of Kaatha was 85.22 % while the least effective was the aqueous extract of Rajamun. Control samples had significantly (p<0.05) the highest TBA value was 1.98mg malondialdehyde (MDA)/ Kg, while beef samples mixed with 1% of pomposia juice had significantly (p<0.05) the lowest TBA values was 0.79 mg (MDA)/ Kg at the end of the storage period. All samples showed good overall acceptability; in all cases the values were higher than 6. However samples mixed with 0.75 and 1.00 of crude juice of Kaatha had significantly (p<0.05) the highest scores of over all acceptability were 8.59 and 8.48, respectively. The obtained results indicated that polyphenolic compounds present in pomposia juice and ethanolic extract had high antioxidative effect in reducing the formation of hydroperoxides during refrigerated storage.