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As a result of analyses of the effect of high voltage electrical stimulation (voltage of 330 V, frequency of 17 Hz, duration of 120 s) carried out ca. 40 min after slaughter on tenderness of bullocks (n=8) meat, lower values of the maximum shear force were obtained for the stimulated muscles (except for semimembranosus muscle stored for 144 h) as compared to its values noted for control muscles over the entire storage period. In addition, values of the maximum shear forces of stimulated, fresh m. longissimus dorsi and m. semimembranosus were alike and reached ca. 44 N. Results of analyses into the effect of storage time (144 h) on meat tenderness demonstrated that differences between the values of the maximum shear forces of the stimulated and control m. semimembranosus were decreasing along with time, whereas differences between the values of shear forces of m. longissimus dorsi (stimulated and control) were remaining at a constant level (ca. 30 N). The results obtained demonstrated that high voltage electrical stimulation, by means of an own-construction device, improves tenderness of the muscles examined.
The paper presents results of a research aimed at determining the effect of high-voltage electrical stimulation and age of animals on the major quality attributes of beef hams. The experimental material consisted of beef meat (semitendinosus muscle) originated from heifers aged ca. 18 months and from cows aged ca. 10 years. Slaughter was performed ca. 12 h after resting of animals in lairage. Electrical stimulation of left half-carcasses was performed applying current with the voltage of 330 V, frequency of 17 Hz and pulse duty factor of 0.9, for 120 s. The right half-carcasses were kept as controls. The stimulated meat obtained 24 h after slaughter from the left half-carcasses was used to produce beef hams at the “Ostrołęka S.A.” Meat Plant, Ostrołęka. The same technology was applied to produce hams from the non-stimulated meat. The results obtained indicated, among others, a beneficial effect of applying an own-construction device for electrical stimulation of beef carcasses on improving the quality of hams produced from meat of heifers and cows. Both the instrumental evaluation as well as the final sensory assessment indicated that the electric stimulation applied improved the quality of hams produced from cow meat to a higher extent than the hams produced from the meat of heifers.
W pracy przedstawiono wyniki badań, których celem było określenie wpływu elektrostymulacji wysokonapięciowej, przeprowadzonej za pomocą urządzenia własnej konstrukcji, oraz rodzaju mięśnia na kruchość pastrami wołowego. Wyniki oceny instrumentalnej wykazały, że najlepszą kruchością, wyrażoną najmniejszą wartością maksymalnej siły przebicia (35,60 N), charakteryzowało się pastrami wyprodukowane z mięśnia najdłuższego grzbietu stymulowanego. Wartości maksymalnej siły przebicia pastrami wyprodukowanego z mięśni stymulowanych: półbłoniastego i półścięgnistego wynosiły odpowiednio: 37,00 i 40,40 N. Wartości maksymalnej siły przebicia pastrami wyprodukowanego z mięśni nie stymulowanych wynosiły natomiast odpowiednio: 55,2; 50,40 i 45,20 N. W ocenie sensorycznej najlepszą kruchością charakteryzowało się pastrami wyprodukowane z mięśni stymulowanych: półbłoniastego i półścięgnistego (4,75 pkt.) a następnie pastrami wyprodukowane z mięśnia stymulowanego najdłuższego grzbietu (4,42 pkt.). Na podstawie uzyskanych wyników badań stwierdzono, że elektrostymulacja wysokonapięciowa z zastosowaniem urządzenia własnej konstrukcji, istotnie wpływa na poprawę kruchości pastrami wołowego, jako podstawowego wyróżnika jego jakości. Umożliwia tym samym produkcję pastrami o dobrej kruchości, niezależnie od rodzaju mięśnia.
The aim of the study was to take an attempt to use conductivity properties of fresh and stored in chilling conditions beef for assessment and control of its ripeness. The experimental material was longissimus dorsi muscle of heifers black-white breed. Left half carcasses were applied to high-voltage electrical stimulation, with own-construction device. Right half carcasses were the control samples. Muscles trimmed 1, 24, and 72 h after slaughter as well as those trimmed 24 h after slaughter and stored (2°C, 14 days) were subjected to the following measurements: impedance, resistance and reactance with an HP 4263B meter (250 mV, 100 Hz – 100 kHz). The differences between impedance and resistance values measured at 100 Hz and 10 kHz were the basis to define the ripeness indicators (QRZ, QRR) of meat trimmed in different time after slaughter. Then, using the triangle resistance graph, cos φ and sin φ coefficients for meat stored in chilling conditions were calculated. The research revealed that non stimulated meat trimmed 1 h after slaughter was characterised with the lowest ripeness indicator, whereas the stimulated one trimmed 72 h after slaughter with the highest ripeness indicator. The results of cos φ and sin φ studies showed that changes of conductivity properties for stimulated meat were stabilized already about 24 h after slaughter, whereas for the non stimulated one after about 14 days of cooling storage, which is in accordance with the time of achievement of full ripeness for stimulated and non stimulated beef. The study indicates possibilities to develop a method of fast assessment and control of ripeness of beef on the basis of conductivity properties.
This study was conducted to determine the influence of high-voltage electrical stimulation on quality of cooked beef hams produced from semitendinosus muscle of heifers and young bulls. Texture evaluation of hams was conducted with the universal testing machine Instron type 4301. Additionally, puncture and shear tests were performed. Six trained panelists conducted sensory analysis. The attributes evaluated were as follow: appearance, structure and consistency, taste and flavour as well as tenderness. The results of sensory examination and instrumental measurement revealed that the influence of high-voltage electrical stimulation on cooked hams depends on animals’ sex. The most significant difference in quality of hams was observed between stimulated and non-stimulated hams produced from semitendinosus muscle of heifers.
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