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Influence of Temperature and Screw Pressing on the Quality of Cassava Leaf Fractions

Author

Listed:
  • Haimanot Hailegiorgis Ayele

    (Tropics and Subtropics Group, Institute of Agricultural Engineering, University of Hohenheim, 70599 Stuttgart, Germany)

  • Sajid Latif

    (Tropics and Subtropics Group, Institute of Agricultural Engineering, University of Hohenheim, 70599 Stuttgart, Germany)

  • Joachim Müller

    (Tropics and Subtropics Group, Institute of Agricultural Engineering, University of Hohenheim, 70599 Stuttgart, Germany)

Abstract

In this study, the development of a mild processing method for cassava leaves to remove cyanogenic compounds with minimum nutritional loss is evaluated. Fresh leaves were reduced in size using a mixer at temperatures of 25 (room temperature), 55, 80, and 100 °C for 1 min before screw pressing to separate the juice and press cake fractions. Cyanide content in the fresh leaves was reduced by 60% at 100 °C and by 57% in the juice sample processed at 25 °C. The press cake cyanide content was low (210 ppm) in both the control and the sample that was processed at 55 °C. An increase in the temperature for processing cassava leaves to 100 °C resulted in a loss of 5–13% of the CP and 7–18% of the vitamin C content. The press-cake fraction had high beta-carotene, lutein, and chlorophyll a and b content, and low values were registered for the juice fraction. Processing fresh cassava leaves at 25 and 55 °C resulted in fractions with high beta-carotene and lutein content. The protein quality of press cake was better than that of juice for feed. Short thermal shredding with pressing resulted in minimal loss of nutrients and a significant reduction of cyanide in the leaves.

Suggested Citation

  • Haimanot Hailegiorgis Ayele & Sajid Latif & Joachim Müller, 2021. "Influence of Temperature and Screw Pressing on the Quality of Cassava Leaf Fractions," Agriculture, MDPI, vol. 12(1), pages 1-13, December.
    • Handle: RePEc:gam:jagris:v:12:y:2021:i:1:p:42-:d:715168
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    References listed on IDEAS

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    1. Aditya Parmar & Asnake Fikre & Barbara Sturm & Oliver Hensel, 2018. "Post-harvest management and associated food losses and by-products of cassava in southern Ethiopia," Food Security: The Science, Sociology and Economics of Food Production and Access to Food, Springer;The International Society for Plant Pathology, vol. 10(2), pages 419-435, April.
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