Abstract
Investigations were carried out to study the effect of different parameters, viz. drying air temperature, chemical treatment, pricking, stage of harvesting and osmosis on drying kinetics of Indian jujube (cv. Umran). The fruits were dried in the mechanical drier at three different temperatures to a final moisture content of 16%(wb). It was observed that drying air temperature, chemical treatment, pricking and maturity stage resulted in reduction in drying time. Experimental data were fitted to Page's and generalised exponential model. The Page's model fits better with experimental data for its better values of R2 compared to generalised exponential model. The drying rate constant k increased with drying air temperature. The results indicated that the Arrhenius law may be applicable to relate the dependence of rate constant on drying air temperature. Activation energies (E) and frequency factor values (ko) were higher in treated and pricked osmo-mechanically dehydrated, Stage II samples compared to others. Higher E values signified greater temperature sensitiveness of these samples. This was reflected in reduced drying times for these treatments. Variation of coefficient ‘n’ with temperature was non-systematic.
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Claims 10
Claim · model-written summary
Higher drying air temperature reduced drying time.
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Verbatim
e0“drying air temperature, chemical treatment, pricking and maturity stage resulted in reduction in drying time”
Claim · model-written summary
Chemical treatment reduced drying time.
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Verbatim
e0“chemical treatment, pricking and maturity stage resulted in reduction in drying time”
Claim · model-written summary
Pricking reduced drying time.
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Verbatim
e0“pricking and maturity stage resulted in reduction in drying time”
Claim · model-written summary
Maturity stage affected drying time, reducing it.
Not reportedTaxon
Verbatim
e0“maturity stage resulted in reduction in drying time”
Claim · model-written summary
Page’s model fit the drying data better than the generalized exponential model.
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Verbatim
e0“The Page's model fits better with experimental data for its better values of R2 compared to generalised exponential model”
Claim · model-written summary
Drying rate constant k increased with air temperature.
Not reportedTaxon
Verbatim
e0“The drying rate constant k increased with drying air temperature”
Claim · model-written summary
Arrhenius law may describe temperature dependence of drying rate.
- Outcome
- dependence of rate constant on drying air temperaturee0
Not reportedComparatorValue
Verbatim
e0“the Arrhenius law may be applicable to relate the dependence of rate constant on drying air temperature”
Claim · model-written summary
Activation energies and frequency factors were higher in treated and pricked Stage II samples.
- Organ / stage
- Stage IIe0
- Outcome
- Activation energies (E) and frequency factor values (ko)e0
- Direction
- highere0
- Comparator
- otherse0
Not reportedTaxon
Verbatim
e0“Activation energies (E) and frequency factor values (ko) were higher in treated and pricked osmo-mechanically dehydrated, Stage II samples compared to others”
Claim · model-written summary
Higher activation energy signified greater temperature sensitivity.
Not reportedTaxon
Verbatim
e0“Higher E values signified greater temperature sensitiveness of these samples”
Claim · model-written summary
Coefficient n varied non-systematically with temperature.
Not reportedTaxonDirection
Verbatim
e0“Variation of coefficient ‘n’ with temperature was non-systematic”