ANALYSING WARNER-BRATZLER CURVES

Autor: N. L. King, P.N. Jones
Rok vydání: 1983
Předmět:
Zdroj: Journal of Texture Studies. 14:283-301
ISSN: 1745-4603
0022-4901
DOI: 10.1111/j.1745-4603.1983.tb00351.x
Popis: Forces required to deform and rupture samples of meat were measured in a modified Warner-Bratzler device. A model is proposed to describe the shape of the plot of force against distance. This model was fitted by a least squares method to experimental curves obtained from (1) bovine longissimus dorsi muscles aged at 15°C for 1–7 days and then cooked at 80°C for 4 h, and (2) bovine biceps femoris muscles conditioned at 15°C for 24 h and then cooked at 80°C for 1–22 h. A plot of the variance between replicate forces, as a function of distance, exhibits two prominent peaks, one of which is thought to be associated with rupturing of fibre bundles, and the other with rupturing of perimysial connective tissue. Parameters calculated by fitting the model to replicate curves indicate that muscle fibres rupture in groups of fibre bundles. Hence, contrary to previous interpretations, initial yield involves rupture of connective tissue, as well as myofibrils. However, the number of fibre bundles forming a group capable of independent rupture varies according to the time-temperature history of the sample, as do other parameters. The model permits relative contributions of fibre bundles and perimysial connective tissue to be estimated. In the samples studied here, perimysial connective tissue offered greater resistance to passage of the blade than did the fibre bundles.
Databáze: OpenAIRE
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