A proposed mechanism of tenderising post-rigor beef using high pressure-heat treatment

Anita Sikes, Eva Tornberg, Ron Tume

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Tenderness of beef M. Sternomandibularis was tough when cooked from both raw, and when previously heated (60 degrees C, 20 min), whereas a significant improvement in tenderness was achieved when pressure-heat (P-H) treated Muscle (200 MPa, 60 degrees C, 20 min) was cooked. In order to determine the mechanism for this improvement, connective tissue, myofibrillar and sarcoplasmic proteins, were separated into three fractions and studied with regard to their solubilisation, denaturation and aggregation, degradation and strengthening of protein structures for the three treatments (raw, heated and H-P treated). Measurements included DSC, SDS-PAGE, surface hydrophobicity, and the appearance, length and width of myofibres (light microscopy). For the connective tissue fraction, heat solubility was determined. It is suggested that the mechanism for this improvement in tenderness is the formation of a strengthened myofibrillar structure that, when sheared by mastication, allows the crack to pass through the meat rather than dissipate into a more visco-elastic structure. In this way a more brittle fracture is achieved and the meat is perceived as more tender, The pre-requisite is that adequate enzymatic activity has occurred. It is Suggested that cathepsins are responsible. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)390-399
    JournalMeat Science
    Volume84
    Issue number3
    DOIs
    Publication statusPublished - 2010

    Subject classification (UKÄ)

    • Food Engineering

    Free keywords

    • Beef
    • Mechanism
    • Heat-pressure
    • Tenderisation
    • Light microscopy

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