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Analysis of the use of a non-conventional rotary drum for dehydration of microalga Spirulina platensis

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Abstract

The high content of bioactive compounds in the microalga Spirulina platensis has recently attracted attention from food and pharmaceutical industries. However, for its application an effective preservation technique must be developed. In this paper, we investigated the use of a non-conventional rotary dryer (with an inert bed) for drying the microalga Spirulina biomass and the effects of the operational conditions (air temperature, intermittent feeding interval, filling degree of inert particles, and rotation speed) on its bioactive compounds. The results indicated that this non-conventional drying system offers an effective alternative for expanding the use of this biomass in an adequate form. We identified the conditions in which the dried material had maintained satisfactory contents of phenolics (air temperature of 70 °C and intermittent feeding interval of 10 min), flavonoids (intermittent feeding interval of 17.4 min), and phycocyanin compounds (air temperature of 40 °C), which were near to those present in fresh microalga.

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Acknowledgements

The authors are grateful for the financial support of the Brazilian research funding agencies CNPq, Finep, Capes and Fapemig.

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  1. School of Chemical Engineering, Federal University of Uberlândia, Bloco K, Campus Santa Mônica, Uberlandia, MG, 38400-902, Brazil

    Neiton C. Silva, Cláudio R. Duarte & Marcos A. S. Barrozo

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  1. Neiton C. Silva
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  2. Cláudio R. Duarte
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  3. Marcos A. S. Barrozo
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Correspondence to Marcos A. S. Barrozo.

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Silva, N.C., Duarte, C.R. & Barrozo, M.A.S. Analysis of the use of a non-conventional rotary drum for dehydration of microalga Spirulina platensis. Bioprocess Biosyst Eng 43, 1359–1367 (2020). https://doi.org/10.1007/s00449-020-02329-1

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