首页|Radio frequency-assisted hot air drying of carrots for the production of carrot powder: Kinetics and product quality
Radio frequency-assisted hot air drying of carrots for the production of carrot powder: Kinetics and product quality
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NSTL
Elsevier
Radio frequency-assisted hot air drying (RF-HAD) was carried out to produce carrot powders. Effect of electrode gap, sample thickness and sample weight on RF-HAD efficiency was investigated. 90 mm of electrode gap, 2.5 cm of sample thickness and 600 g of sample weight were selected as RF-HAD parameters in order to obtain acceptable drying rate and avoid excessive deformation. RF-HAD kinetics were studied and compared with hot air drying (HAD). RF-HAD increased drying rate and reduced drying time by 45%. Also, the quality of carrot powders obtained after RF-HAD was evaluated and compared with those produced by air and freeze drying. The results showed that the samples dried with RF-HAD had greater contents of 8-carotene, ascorbic acid, and total phenols, higher antioxidant activity and improved rehydration capacity compared to HAD. The better retention of cellular microstructure after RF-HAD also resulted in better rehydration capacity. Beta-carotene, ascorbic acid, total phenolic content and antioxidant activity retention rates were 80.26%, 45.33%, 72.42% and 67.49%, respectively, for RF-HAD. These values were 89.36%, 47.02%, 79.98% and 70.61% for freeze dried samples. The retention of bioactive compounds after RF-HAD was comparable to those achieved by freeze drying.
Carrot powderRadio frequency-assisted hot air dryingDrying kineticsQuality
NSTL
Elsevier
