3.4. Mechanical properties
Compression or elasticity modulus, failure or fracture stress
and strain are mechanical properties usually associated to
elasticity, strength and firmness, respectively (Torres et al.,
2006). Table 4 shows that the drying process causes an increment in the fracture strain (ε
HF) as well as in the values of
failure stress (
HF), evidencing greaterhardness indehydrated
fruit. Also,the dehydrationprovoked a drastic decrease inthe
compression modulus (E) of pineapple, perhaps owing to the
loss ofturgor and firmness in the vegetable tissue.
The statisticalanalysis (ANOVA)indicatedthe insignificant
effect ofthe drying temperature on
HF values, when the fruit
was dried at different air temperatures until the final moisture content was reached. So,there arenotdifferences among
the means of
HF values (p>0.05) in samples with approximately 80% moisture content, obtained by drying at 45, 60
and 75◦
C (Table 4). Prachayawarakorn et al. (2008) also noted
the insignificant effect ofthe drying temperature onthemaximum compression force of dried banana slices.
3.4. Mechanical propertiesCompression or elasticity modulus, failure or fracture stressand strain are mechanical properties usually associated toelasticity, strength and firmness, respectively (Torres et al.,2006). Table 4 shows that the drying process causes an increment in the fracture strain (εHF) as well as in the values offailure stress (HF), evidencing greaterhardness indehydratedfruit. Also,the dehydrationprovoked a drastic decrease inthecompression modulus (E) of pineapple, perhaps owing to theloss ofturgor and firmness in the vegetable tissue.The statisticalanalysis (ANOVA)indicatedthe insignificanteffect ofthe drying temperature on HF values, when the fruitwas dried at different air temperatures until the final moisture content was reached. So,there arenotdifferences amongthe means of HF values (p>0.05) in samples with approximately 80% moisture content, obtained by drying at 45, 60and 75◦C (Table 4). Prachayawarakorn et al. (2008) also notedthe insignificant effect ofthe drying temperature onthemaximum compression force of dried banana slices.
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