Brookfield LFRA Texture Analyzer - Manual (Page 25)

Brookfield Engineering Labs., Inc. Page 5 Manual No. M/05-370-B0507
LFRA SETTINGS: MODE: Measure force in compression
PLOT: Final
SPEED: 0.1 mm/s
DISTANCE: 2, 4, or 6 mm
OPTION: Normal
TRIGGER: Auto 4g pre-set
PROBE REF: Stainless steel needle probe, 10° Taper (Ref: TA9)
Confectionery holding rig
METHOD: Samples were removed from wrappers and broken into individual chunks.
The individual chocolate piece was then held within jaws of confectionery
holder clamped to adjustable bed of LFRA approximately 2mm below
surface probe.
. READING:
. .
t
CONSISTENCY
Total.+ve.Area
HARDNESS
Peak.+ve.Force
F
ADHESION
Total.-ve.Area
ADHESION FORCE
Peak.-ve.Force
Note:. Graph.shows.continuation.of.penetration.at.2mm,.4mm
. and.6mm.parameter.values.recorded.at.set.points.for
. each.penetration.depth.
DISCUSSION: Force:deformation curves generated indicate a linear relationship between
forces generated and depth of penetration. It is therefore recommended
that the 4mm mid penetration value is utilized to permit evaluation of a
range of chocolate types thus enabling comparison of a range of results.
PARAMETER All parameters are automatically calculated within the a test report once
COLLECTION they are selected on the test results tab. Thus calculate parameters for
each curve individually and record results.
PARAMETERS: HARDNESS Force necessary to attain a given deformation
CONSISTENCY Internal strength of bonds within a product
ADHESION Work necessary to overcome attractive forces
between surface of the food and materials with
which it comes into contact.