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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Destruction of Clostridium perfringens S-45 was compared in inoculated beef loaves cooked to 49°, 57°, 66°, or 74°C in an electric crockery pot (CP) or in an oven at 163°C (MO). In loaves cooked to 74°C, aerobic plate counts were lower and total cooking losses were higher in the CP than in the MO. Destruction of C. perfringens was similar for CP and MO methods. Vegetative cell counts were similar in raw meat and in all loaves cooked to 49°C. Cell counts were reduced by 1.4 log10 at 57°C and 2.2 log10 at 66° and 74°C. Spore counts in raw loaves and in loaves cooked to 49° and to 57°C were similar but decreased by 0.5 log10 and 1.2 log10 in loaves cooked to 66° and 74°C, respectively. In beef loaves cooked to a recommended temperature of 74°C (7 hr in the CP on low and 11/2 hr in the MO), too few C. perfringens S-45 survived to constitute a food poisoning hazard if the meat were eaten immediately.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 34 (1969), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: –The effect of heat on trichina larvae was studied in pork roasts cut from trichinae infected loins. Roasts were cooked to end-point temperatures of 120, 125, 130, 135, 140, 145, 150 or 160°F in electric household ranges at oven temperatures of 200, 325 or 350°F. Samples of the cooked roasts were artificially digested; the recovered- larvae were examined for viability. Also samples were fed to rats; 4 weeks later the rats were killed and examined for presence of trichinae by digesting aliquots of ground rat tissue. All larvae were destroyed in roasts cooked to 140° or higher; viable larvae were found in some of the roasts cooked to 135°F and in all of the roasts cooked at 130°F or lower. Thus the thermal death point of trichinae is between 130° and 140°F.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 41 (1976), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The objective was to determine the survival of C. perfringens S-45 in inoculated rump roasts (1.6 kg) cooked in an electric crockery pot set on low or in an electric oven set at 107° or 177°C. Log counts for raw samples from roasts inoculated with C perfringens were 6.30/g for vegetative cells and 3.17/g for spores. Final internal temperatures and cooking times were 81°C and 10 hr for the crockery pot, 85°C and 9 hr for the slow oven, and 77°C and 21/2 hr for the moderate oven. Total cooking losses were 38 and 39% for roasts cooked in the crockery pot or slow oven and were lower, 32%, for roasts cooked in the moderate oven. Each cooking method reduced C perfringens cell counts by at least 3.4 log cycles and spore counts by at least 0.6 log cycle. Analysis of variance indicated that the counts of vegetative cells and spores on the cooked roasts were similar for the three methods of cooking.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 41 (1976), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Beef or soy flavor of meat loaves containing 0, 15% soy flour or 15% soy concentrate were evaluated after cooking in microwave or in conventional ovens. Also, cooking time, cooking losses, fat and moisture content and thiamine retention were determined. Beef or soy flavor was significantly affected (P 〈 0.01) by loaf type, but not by oven treatment. Loaves (960g) cooked electronically reached 74°C in 19 min and had consistently higher cooking losses than those cooked conventionally for 78 min. Substitution of 15% soy reduced cooking losses more in loaves cooked in electric than in microwave ovens. Soy had no effect on the fat content, but cooking had a significant (P 〈 0.01) effect; i.e., 11.5% fat in electronically and 9.6% in conventionally cooked loaves. Thiamine retention was not affected by 15% soy substitution. The average thiamine content, regardless of treatment, was 0.09 mg/100g of the cooked loaves.
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 28 (1963), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The results reported here represent a preliminary study of the action of papain on the proteins of beef skeletal muscle. Suspensions of protein preparations which had been isolated from beef semitendinosus muscle were incubated with both crystalline papain and a commercial enzyme preparation. Analyses of ultrafiltrates of the enzyme digests indicated that all of the skeletal muscle protein fractions studied were affected by papain to some extent. Under the experimental conditions employed, the intracellular proteins were affected less by the commercial “meat tenderizer” than by crystalline papain. However, the effect of the two enzyme preparations on the connective tissue fractions was comparable. Papain appeared to affect mucoprotein and collagen more than the other skeletal muscle proteins. Incubation with papain markedly lowered the viscosity of the mucoprotein preparation. Collagen suspensions were converted to thick gels by the action of papain. These observations and the results of ultrafiltrate analyses suggest that the tenderizing effect of papain may be due at least in part to the breakdown of connective tissue.
    Type of Medium: Electronic Resource
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