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Process optimisation of vacuum drying of onion slices

Author

Listed:
  • Jayeeta Mitra

    (Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur, India)

  • Shanker Lal Shrivastava

    (Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur, India)

  • P. Srinivasa Rao

    (Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur, India)

Abstract

Dehydration of untreated and pre-treated onion slices under vacuum was optimised using the response surface methodology. The effects of the drying temperature (50-70°C), slice thickness (1-5 mm), and treatment (5% NaCl and 0.2% K2S2O5) were observed on the responses, viz. final moisture content, colour change, flavour content, and rehydration ratio of the dehydrated onion slices. Full factorial design was employed for the analysis. Optimisation of the vacuum drying process was achieved based on the criteria of maximum flavour retention, 3-3.5% db moisture content, acceptable colour, and rehydration ratio using numerical technique. The optimum condition for the treated sample was found at 58.66°C drying temperature and 4.95 mm slice thickness. Optimum values of the response parameters, namely the moisture content, colour, flavour content, and rehydration ratio were obtained as 3.5% d.b., 30.33 OI/g dried sample; 4.35 μmol/g dried sample and 4.82, respectively.

Suggested Citation

  • Jayeeta Mitra & Shanker Lal Shrivastava & P. Srinivasa Rao, 2011. "Process optimisation of vacuum drying of onion slices," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 29(6), pages 586-594.
    • Handle: RePEc:caa:jnlcjf:v:29:y:2011:i:6:id:162-2010-cjfs
    DOI: 10.17221/162/2010-CJFS
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