Brookfield LFRA Texture Analyzer Bedienungsanleitung PDF herunterladen (Seite 23)

Brookeld Engineering Labs., Inc. Page 23 Manual No. M/05-370-B0507

METHOD: Biscuits approximately 6 mm thick were located beneath the probe and

clampedtotheanalyzerbedusinglowpressureclips.Theprobethen

penetratedsampletotargetdistanceandtheproleofcharacteristicswas

recorded through the interface package.

READING:

Hardness

)

Quantity of Fractures

Calculate mean of all values

)

Distance

Fracture Point

Final

= Indication of Crispiness

(Crispiness becomes a function of hardness)

Relate the mean value of peaks obtained to the original hardness

value. Empirically our investigations highlighted that higher

values of the ratio were indicative of increased crispiness.

X Y

DISCUSSION: As the probe travels through the sample an initial fracture of the surface

is recorded. This fracture is greater in relation to other peaks within the

chocolate coated sample due to surface characteristics. A range of internal

fractures are then recorded as the probe progresses to the target deforma-

tion of 3 mm. The level of peaks within the sample were considered as

being indicative of crispiness e.g. harder samples showed greater fracture

andwerethusconsideredasbeingmorecrispy.Theoverallforce:defor-

mation curve highlights various peaks and troughs as the aerated structure

of the sample is penetrated, peaks may be caused through the presence of

sugar crystals or where the probe makes contact with air pockets within

the dough structure. The overall positive area of the curve is indicative

of sample hardness (as is peak force) and may be taken as a direct indica-

tion of bake conditions imposed e.g. hotter oven or longer residence time

produces a harder biscuit within a sample batch. As two different varieties

of biscuit were evaluated, the overall hardness characteristics were consid-

ered to be the result of variations in formulation, composition and process

conditions imposed. Please note that if inclusions such as chocolate chips

oroatsareinthebiscuit,theywillcontributedirectlytoresultuctuations.

PARAMETER Parameters were calculated within the Load vs. Time Graph after the

COLLECTION cursors had been positioned at start of curve to include as greater range of

peaks as possible. Consistency was taken as total positive area.

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Brookfield LFRA Texture Analyzer Bedienungsanleitung Seite 23