Abstract The effect of oregano essential oil (OE) and rosemary extract (RE) on the survival and growth of Staphylococcus aureus, and the total aerobic bacteria (TA) in cooked ground chicken meat stored at different temperatures had been evaluated. Five treatments including i) Control (no additives); ii) 150 ppm OE; iii) 350 ppm RE; iv) 150 ppm OE + 350 ppm RE; and v) 14 ppm of butylatedhydroxyanisole and butylatedhydroxytolune mixture (BHA/BHT) were prepared. After cooking, all samples were stored (7 days) at different temperature (10, 25, 43 °C) using oxygen permeable bags and tested for TA, and total viable count of Staph. a. In addition, all additives were showed significant (P < 0.05) antimicrobial effect during storage time compared to the control. Both OE and RE showed comparable antimicrobial effect compared to the synthetic (BHA/BHT) additive at all storage temperatures. However, the combination treatment (OE + RE) was the highest among other additives suppress bacterial growth (APC & Staph. a) during storage. Based on these results, it is concluded that both OE and RE were showed significant (P < 0.05) antimicrobial activity, but this effect could be higher if meat treated by their combined mixture.

Abstract Preservative effect of oregano essential oil (OE) and rosemary extract (RE) on ground chicken meat stored at different refrigeration time had been evaluated. Six treatments were prepared: T1) Control (No additives); T2) Combination (CM1) of 100 ppm OE and 300 ppm RE; T3) CM2: 100 ppm OE + 350 ppm RE; T4) CM3: 150 ppm OE + 300 ppm RE; T5) CM4: 150 ppm OE + 350 ppm RE; T6) 14 ppm of butylated hydroxyanisole (BHA). Meat patties were individually packaged in oxygen-permeable bags stored at 4 °C, and analyzed for lipid and protein oxidation, and CIE color values at 0, 4, and 7 days. Individual cooked thigh meats were used to evaluate different sensory attributes. All additives showed significant (P < 0.05) antioxidant effect delaying lipid and protein oxidation after day 4 comparing to the control treatment samples. However, the highest significant (P < 0.05) effect among all treatments was by CM4. The CM4 was the highest stabilizing raw meat color, and preventing meat discoloration. In addition, it showed (CM4) highest overall acceptability scores values regarding sensory evaluation. Based on current results, both OE and RE had a potential antioxidant activity; however, this could be stronger if used together.

Abstract Evaluate of Origanum syriacum L. essential oil grown in Jordan, and other comparable antioxidant on TBARS, total carbonyl, color values, and sensory attributes of raw chicken meat was investigated. Six treatments were prepared: (1) control (no additive); (2) 100 ppm oregano essential oil (OE); (3) 150 ppm OE; (4) 300 ppm L-ascorbic acid (E-300); (5) 5 and 14 ppm butylatedhydroxyanisole (BHA/E-320) for both breast and thigh meat respectively, and 6) 150 ppm Sodium nitrite (E-250), were prepared using ground chicken meat. Generally, OE at level of 150 ppm was the most effective decreasing TBARS, and total carbonyl values compared to the other treatments. Furthermore, it showed better color values (L* and a*) in term of meat color stability. However, OE and E-250 also showed the highest significant values among the other treatments. Sensory evaluation results showed that adding OE at level of 150 ppm and 100 ppm were the best values maintaining meat storage stability. Therefore, it can be recommended that OE at level of 150 ppm could be an excellent replacement to the synthetic antioxidant in the future of uncured, natural fresh meat products, and raw meat prepared for processing.