The volatile bases in beef were studied in an effort to identify the compounds responsible for the characteristic unpleasant odor of beef preserved by irradiation. The beef used in this work received 2.33 and 3.72 megarads of gamma radiation, and its odor was due in part to volatile bases that were measured quantitatively by the Conway-Byrne microdiffusion method and by gas chromatography. The amine fraction of the volatile bases was estimated quantitatively by a colorimetric method and by gas chromatography. Methylamine and ethylamine were identified by gas and paper chromatography as the major components of the amine fraction, with at least four other amines being detected also.

Effect of supplementation with roasted date seed powder (DSP)on the texture and sensory properties of spreadable processed cheese was carried out. Four different formulas of processed cheese were prepared (F-C, F-1, F-5, and F-10) with added 0, 1, 5, and 10 % of roasted DSP.Results revealed that the DSP is of higher total phenolic (TPC, 38.3 mg GAE/g) and flavonoid (TFC, 33.4 mg QE/g) contents, and antioxidant activity (AOA, 83.9%).Adding DSP resulted in significant differences (P ˂ 0.05) in total solids and fiber contents, and insignificant differences in fat content, fat/dry matter, and protein. The lowest ash content of 3.20% and the lowest soluble nitrogen of 1.68% were detected in treatment F-10. pH values significantly (P ˂ 0.05) increased by adding DSP, while decreased with the progress of storage time. Meltability and oil separation index significantly increased (P ˂ 0.05) over time,while it significantly decreased by adding DSP.Texture parameters increased (P<0.05) over time. Hardness increased while springiness, cohesiveness, gumminess, and chewiness values decreased by adding DSP. A proportional increase (P ˂ 0.05) in TPC, TFC, and AOA was detected by increasing the added DSP.Thus, F-10 treatment contained the higher TPC, TFC, and AOA %.A slight increase in TPC, TFC, and AOA was found by prolonging the storage period.As with the sensory evaluation, all formulations were acceptable, and F-5 followed by F-1 acquired the highest scores of overall acceptability. Thus, this study demonstrated the possibility of using roasted DSP in the manufacturing of processed cheese with high-quality properties,antioxidant activity,and sensory acceptability.