Food Texture

17 important questions on Food Texture

How consumer determine texture of food products?

  • Visual observation
  • Hearing
  • Touching/feeling
  • Smelling
  • Tasting

What are three product properties of texture?

  • Structure
  • Mechanical properties
  • Surface properties

What are 5 Mechanical properties of Texture ?

  • Elasticity (pasta)
  • Viscosity (water)
  • Fracture stress (cookies)
  • Fracture stain (cookies)
  • Yield stress (ketchup)
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Which mechanical properties can be tested using rheological techniques ?

  • Elasticity
  • Viscosity
  • Fracture stress

What viscosity in food?

Viscosity is a physical property of fluids. It shows resistance to flow. In a simple example, water has a low viscosity, as it is "thin". Syrup and tar, on the other hand, have a high viscosity, as they are "thick". -Stroperigheid van vloeistof

What is yield stress?

the minimum stress at which a solid will undergo permanent deformation or plastic flow without a significant increase in the load or external force.

What are 3 types of rheological behavior?

  • Viscous flow (liquids)
  • Elastic deformation ('solids')
  • Visco-elastic behaviour (most food products)

What are the two important rheological concepts ?

  • Stress: force per unit area applied to a material
  • Strain:  Relative deformation of the material

What plays a role at simple formations regarding elastic materials?

  • Simple shear
  • Compression (elongation)

What is rheological behavior?

is the scientific field that sans-serifenclose the flow phenomena of matter (solids, liquids, and gases)

What is shear thinning?

Shear thinning means that the fluid viscosity decreases with increasing shear stress.

What is shear thickening?

shear thickening) material is one in which viscosity increases with the rate of shear strain.

Examples Flow behavior?

  1. Newtonian - Water
  2. Shear rate thinning - yoghurt
  3. Shear rate thickening - peanut butter

What is the difference between low and large strain?

  • Low strain: No permanent deformation of microstructure
  • large strain: permanent deformation of structure or fracture

What are meaning of stress and strain regarding fracture properties?

  • Stress:  force needed to break the structure
  • Strain: deformation needed to beak the structure

What is function of a Texture analyzer?

  • Imposes shear rate, measures stress
  • Multifunctional by using of a range of probes

What is a penetrometer ?

A penetrometer is a device to test the strength of a material.

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