Journal
FOOD CHEMISTRY
Volume 293, Issue -, Pages 103-111Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2019.04.095
Keywords
Jinhua ham; Bitterness; Adhesiveness; Protein modifications; Water distribution; Partial least square regression
Funding
- National Key Research Program of China [2016YFD0401502]
- Modern Agricultural Technical System Foundation [CARS35]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Defects with textures and flavors are a common problem, causing many economic losses in the dry-cured ham industry. To obtain a better understanding of the defects of dry-cured ham, texture, protein denaturation, protein structure, and water distribution of normal and defective hams were investigated. Compared with normal ham, more than 1.5-fold values in adhesiveness and bitterness, and less than 0.8-fold values in hardness were found in defective ham. The intense denaturation of sarcoplasmic proteins and actin, and the dramatic transformation of a-helix to beta-sheet were the key modification of proteins; a high proportion (92.39%) of immobile water contributed to the excessive softness and adhesiveness of defective hams. Furthermore, high denaturation of proteins could accelerate the degradation of proteins, which further developed the bitterness and adhesiveness of defective hams. Partial least squares regression demonstrated that the discrepancies in protein denaturation, protein structure and water distribution were related with bitterness and adhesiveness of Jinhua ham.
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