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Related Experiment Videos

Reducing cassava toxicity by heap-fermentation in Uganda

A J Essers1, C Ebong, R M van der Grift

  • 1Department of Food Science, Wageningen Agricultural University, The Netherlands.

International Journal of Food Sciences and Nutrition
|May 1, 1995
PubMed
Summary
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Heap-fermentation significantly reduces toxic cyanogens in cassava, improving safety compared to sun-drying. While effective, further process optimization is recommended for consistently safe cassava products.

Area of Science:

  • Food Science and Technology
  • Agricultural Science
  • Public Health Nutrition

Background:

  • Cassava is a vital staple crop, but its consumption poses risks due to inherent cyanogen toxicity.
  • Traditional processing methods, like sun-drying, may not sufficiently reduce cyanogen levels.
  • The Alur tribe in Uganda employs solid substrate heap-fermentation for cassava processing.

Purpose of the Study:

  • To evaluate the effectiveness of heap-fermentation in reducing cyanogen levels in cassava.
  • To analyze the microflora, protein content, amino acid profile, and mycotoxin contamination of fermented cassava.
  • To compare heap-fermentation with traditional sun-drying methods.

Main Methods:

  • Field monitoring of cassava heap-fermentation at rural households and laboratory replication.

Related Experiment Videos

  • Analysis of cassava flour for residual cyanogens, mutagenicity, cytotoxicity, and aflatoxins.
  • Assessment of protein quantity, amino acid patterns, and cassava gel viscosity.

    • Main Results:

    • Heap-fermentation reduced total cyanogen levels significantly, from 436.3 to 20.4 mg CN equivalents/kg.
    • Residual cyanogens correlated positively with particle size; heap-fermentation was more effective than sun-drying.
    • No mutagenicity, cytotoxicity, or aflatoxins were detected; protein content remained stable.

    Conclusions:

    • Heap-fermentation is an improved method for reducing cassava cyanogens compared to sun-drying, especially for high-cyanogen varieties.
    • The process modifies cassava gel viscosity favorably and does not introduce new health risks like mycotoxins.
    • Optimization of heap-fermentation is recommended to ensure consistently safe cyanogen levels in the final product.