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Drying Performance and Product Quality of Sliced Carrots by Infrared Blanching Followed by Different Drying Methods

  • Bengang Wu , Zhongli Pan , Baoguo Xu , Junwen Bai , Hamed M. El-Mashad , Bei Wang , Cunshan Zhou and Haile Ma EMAIL logo
Published/Copyright: July 5, 2018

Abstract

The objective of this study was to investigate the processing parameters and quality of carrots under sequential infrared (IR) dry-blanching and (1) hot air drying (IRB-HAD), (2) infrared drying (IRB-IRD), and (3) Infrared-hot air drying (IRB-IRHAD). Water blanching at 90oC was used for comparison. The quality of dried carrot was evaluated based on vitamin C content, rehydration ratio, color, shrinkage and hardness. Applying IR dry-blanching for 15 min resulted in the reductions of about one log in peroxidase (POD) activities and 54 % in moisture reduction. A notable change in the surface color and retention of vitamin C were obtained with IR blanching. IRB-IRD and IRB-IRHAD had higher drying rates and higher quality. The recommended processing parameters for IRB-IRHAD are IR blanching for 15 min, followed by IR drying to a moisture content of 30–40 % wet basis (w.b.), and then finished by HA drying to a targeted MC (8 % w.b.).

Acknowledgements

The authors wish to thank for the supports received from program (BK20150500; BK20170538) of Youth Natural Science Fund of Jiangsu Province, National Key Research and Development Program of China (2018YFD0700100、2017YFE0105300、2017YFD0400903), and grant (15JDG070) of Senior Professional Research Start-up Fund of Jiangsu University.

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Received: 2017-12-11
Revised: 2018-03-19
Accepted: 2018-05-24
Published Online: 2018-07-05

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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