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Drying kinetics, moisture diffusivity and lycopene retention of watermelon pomace in different dryers

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Abstract

Drying kinetics of watermelon pomace was investigated in fluidized-bed and cabinet dryers using 2–6 kg/m2 tray loads at 50–70 °C. Drying behavior was described by the Page’s model with high coefficient of determination (≥0.96), lower standard error (≤0.03) and scattered residual plot. Effective moisture diffusivity of pomace during drying varied from 0.880 × 10−8 to 3.541 × 10−8 m2/s for fluidized bed and 0.347 × 10−8 to 0.868 × 10−8 m2/s for cabinet dryers. Arrhenius’s equation adequately explained the relationship between the drying rate constant/effective moisture diffusivity and drying air temperature. Lycopene content of dehydrated watermelon pomace was 11.0–17.3 mg/100 g dry basis in fluidized-bed dryer and 9.3–15.4 mg/100 g dry basis in cabinet dryer.

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Correspondence to Dalbir Singh Sogi.

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Highlights

• Watermelon pomace is generated during processing of watermelon.

• It is generally discarded as waste leading to environment problems.

• Watermelon pomace contains more lycopene as compared to its flesh.

• Dehydration can increase the shelf life of pomace.

• Pigment extracted can be used in different food products.

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Oberoi, D.P.S., Sogi, D.S. Drying kinetics, moisture diffusivity and lycopene retention of watermelon pomace in different dryers. J Food Sci Technol 52, 7377–7384 (2015). https://doi.org/10.1007/s13197-015-1863-7

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  • DOI: https://doi.org/10.1007/s13197-015-1863-7

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