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Force Distance Devices Texture Analyzers. Lab Instruments. A variety of lab instruments exist that carefully control distance and measure force while probing a food sample These instruments can be fitted with a wide variety of probes and fixtures. Gardco LFRA Texture Analyzer.

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lab instruments
Lab Instruments
  • A variety of lab instruments exist that carefully control distance and measure force while probing a food sample
  • These instruments can be fitted with a wide variety of probes and fixtures
slide4

Stable Micro Systems

TA XT2, TA XHD

compression tests
Compression Tests
  • A flat probe is lowered on the sample
  • Sample is contained within area of probe
  • Measure maximum force, force to break or work (sometimes distance) to break used as measure of firmness or hardness
  • Examples: carrot cylinders, cake, gels, rice, bread rolls
penetrometer probes
Penetrometer Probes
  • Smaller cylinder is pushed into sample
  • Maximum force to reach specified distance; force at yield point; mean plateau force
  • Apples, cookies, bread, caramel, cherries, fish, fondant, gels, ice cream, peppers, surimi
  • Probe may be cylinder, cone, or ball
slide16

Ball Probes

Magness Taylor Probes

snapping tests
Snapping Tests
  • Measure force required to snap a rigid food sample
  • Knife edge lowered to a thin food across a bending platform
  • Bending force generated until material snaps
  • Biscuits, cookies, carrot,chewing gum, crackers, dry lasagne, pretzels
  • Used with snack chips, thin crisp items
slide22

Snapping force

Force

Distance

extrusion tests
Extrusion Tests
  • Force applied to sample until it flows through slots, holes, or annular spaces
  • Maximum force to extrude product is measure of firmness or tenderness
  • FMC Pea Tenderometer
  • Viscous materials including some gels, fats, peas, catsup
slide27

For peas

  •  A-B: peas deformed and packed more tightly
  •  B : peas packed solid; liquid begins to be expressed and fill spaces
  •  B-C: force increases as juice is expressed
  • C-D: peas rupture and flow through annulus
slide30

Forward Extrusion

Back Extrusion

slide33
Back extrusion
    • Peas,mayonnaise, rice pudding, syrup, yoghurt
  • Forward extrusion:
    • Baking fats,ketchup