Ground beef patties were prepared from varying fat sources to final raw fat contents of 16, 20, 24, and 28%. Trained sensory panelists evaluated each treatment for differences in tenderness, juiciness, connective tissue amount, mouth coating effect, and ground beef flavor intensity. Other patty characteristics examined included raw and cooked fat and moisture, cooking losses, Instron shear force, and total and percentage of soluble collagen. Generally, increasing fat levels in formulations resulted in higher tenderness and juiciness scores and ratings indicative of lower connective tissue amount. Neither collagen content nor total cooking loss was significantly affected by fat level. Sensory ratings and cooking properties were not significantly affected by fat source.
Short loin steaks selected from beef carcasses representing wide ranges in USDA maturity score (A, B, C, and E) and marbling level (high=moderateoo to moderately abundantso, medium=slight6 7 to modest9 a and low=practically devoid5 o to slight" 3, were subjected to flavor profile analyses. Beef from E maturity carcasses had higher aroma and flavor amplitudes and a greater predominance of "grassy" flavors than did beef from carcasses of other maturity groups. "Astringent" aftertaste was common to most samples. Analyses obtained in our study agree with earlier flavor profile studies conducted on beef of various USDA quality grades. Flavor profiles were developed for steaks from the same carcasses that had provided steaks previously identified as "desirable" or "undesirable" in flavor by two separate panels using hedonic flavor rating scales. "Sweet" and "browned" were typical flavors of steaks previously classified as desirable in flavor, while "grassy" and "astringent" were frequently noted flavors of steaks previously classified as undesirable in flavor. Marbling and fat content were higher in steaks previously classified as desirable in flavor, than in steaks classified as undesirable in flavor.
Texturized peanut grits were substituted at 0, 15 and 30% levels on a rehydrated basis for beeftrimmings in the manufacture of frankfurters. Similar processing characteristics (peelability, cookout losses) were noted between the treatments. Frankfurters processed with 30% peanut grits exhibited a higher incidence of undesirable flavor, greater tenderness and lighter color than the control when evaluated by a trained sensory panel. Regardless oftreatment, broiling and microwave cookery produced greater precision Penetrometer penetration of cross-sectional slices than what was observed when frankfurters were not cooked prior to testing. Compression of the outer surfaces of frankfurters with the Precision Penetrometer indicated a softening effect when broiling and microwave cookery were used vs no cooking only in the 15% peanut grit treatment, No explanation can be provided for this result. The 15% peanut grit formulation was the only one to display a significant (P> .05) increase in aerobic bacterial counts between 0 and 30 days of storage. The results from this study indicate that elevated levels of texturized peanut grits can be successfully incorporated into frankfurters from a sensory, physical and microbial standpoint.
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