Brookfield LFRA Texture Analyzer Uživatelský manuál stáhnout pdf (Strana 21)

Brookeld Engineering Labs., Inc. Page 21 Manual No. M/05-370-B0507

PARAMETERS: HARDNESS Force necessary to attain a given deformation

CONSISTENCY Internal strength of bonds within a product

(Total Positive Area)

ADHESIVENESS Work necessary to overcome attractive forces

(Total Negative Area) between surface of the food and the materials

with which it comes into contact.

ADHESIVE FORCE Force required to “pull” probe from sample

(suction).

MODULUS Ratioofstressdividedbystrainduringtherst

compressioncycle(e.g.,theslopeoftheforce:

deformation curve). It is representative of

sample rigidity.

RESULTS: LOW-FAT FAT-FREE

BREAK LOAD (g) 122 223

HARDNESS (g) 122 227

CONSISTENCY (g.s) 1592.7 3199.9

ADHESION (g.s) -246.4 -522.6

ADHESIVE FORCE (g) -58 -112

MODULUS (g/s) 7.0 15.7

where: gs = work

CONCLUSIONS: Creaminess of samples was evaluated as a comparison between low-fat

and fat-free samples. Its calculation is thus a comparative measure be-

tween two samples, but does give good indication of the effect of formu-

lationontheprotein:proteinnetworkandresultinggelset.Suchatest

would be excellent both within the Quality and Development environ-

ments, where product matching as well as process control could be facili-

tated.

The modulus values formed are also considerably different where the

highervaluesofthefat-freefatproductdenotethermer,morebound

consistency of the product. Note should be made, however, on the posi-

tioning of sample cursors, to ensure that a consistent portion of sample

curve is measured between all batches and samples within.

EMPIRICAL Testconditionswhichwillaffectresultsgenerated:

FACTORS: 1. Samplesize

2. Sample age

3. Sample temperature

4. Base and edge effects

5. Sample container and/or test probe employed

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Brookfield LFRA Texture Analyzer Uživatelský manuál Strana 21