Journal of
Stored Products and Postharvest Research

  • Abbreviation: J. Stored Prod. Postharvest Res.
  • Language: English
  • ISSN: 2141-6567
  • DOI: 10.5897/JSPPR
  • Start Year: 2010
  • Published Articles: 147

Full Length Research Paper

Drying characteristics and antioxidant properties of Java plum seed and skin waste

Amritpal Kaur
  • Amritpal Kaur
  • Department of Food Science and Technology, Faculty of Science, Guru Nanak Dev University, Amritsar 143005, India.
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Dilpreet Singh
  • Dilpreet Singh
  • Department of Food Science and Technology, Faculty of Science, Guru Nanak Dev University, Amritsar 143005, India.
  • Google Scholar
Harpreet Kaur
  • Harpreet Kaur
  • Department of Food Science and Technology, Faculty of Science, Guru Nanak Dev University, Amritsar 143005, India.
  • Google Scholar
Dalbir Singh Sogi
  • Dalbir Singh Sogi
  • Department of Food Science and Technology, Faculty of Science, Guru Nanak Dev University, Amritsar 143005, India.
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  •  Received: 05 April 2018
  •  Accepted: 17 May 2018
  •  Published: 30 June 2018

Abstract

Java plum seeds and skin wastes recovered after passing fruits through a pulper were separated manually and dried in tray/fluidised bed drier at 50, 70 and 90˚C or in freeze drier at -55°C at 4.4 torr. Drying behaviour of java plum seeds and skin followed falling rate period and described adequately by Page's model. Drying rate constant was higher for fluidized bed drier varying from 0.00163 to 0.255406 h-1 for seeds and 0.002042 to 0.004258 h-1 for skin followed by tray and freeze drier. Anthocyanin content of freeze dried java plum skin was 1944 mg/100g dry basis but high drying temperature resulted in lower anthocyanin retention in tray and fluidized bed driers. 'L' and ‘b’ value of java plum seeds increased but ‘a’ value decreased. Free radical scavenging activities of fresh java plum seeds and skin were 92.41 and 93.42% respectively which decreased after drying.

Key words: Java plum waste, drying, free radical scavenging activity, anthocyanin content, Page's model.