Some Objective Instrumental Methods for Evaluating the Texture of Solid Potato Tissue (Solanum tuberosum L.)
نویسندگان
چکیده
The paper presents different objective instrumental methods for studying the rheological behaviour of either fresh or thermally treated potato tissue at large and small deformations. It describes the methodology followed and the equipment used to perform fundamental objective assays of compression, tension, shear, stress-relaxation and creep compliance, and imitative direct texture profile analysis (TPA). It also shows the manner in which the force-deformation, deformation-time and force-time curves are used to obtain different rheological and textural properties. Some examples are given of the type of information that can be derived from them. Some refined measurements and procedures that complement recognized methods are proposed to improve the texture measurement of potato tissue. Since the results of objective methods depend on the experimental setup, some of the factors to be considered in each one have been included. Tests are performed on fresh and thermally-treated potato specimens, and indications are given of the best objective methods and rheological properties to represent the firmness of either fresh potato tissue or potato tissue that has been subjected to the different thermal treatments involved in the frozen potato production process. _____________________________________________________________________________________________________________
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