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Process development for spray drying a value-added extract from aflatoxin-contaminated peanut meal

Authors

  • Aaron J. Oakes,

    1. Department of Food, Bioprocessing & Nutrition Sciences, North Carolina State University, Raleigh, NC 27695, USA
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  • Brittany L. White,

    1. United States Department of Agriculture, Agricultural Research Service, Market Quality & Handling Research, Raleigh, NC 27695, USA
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  • Marshall Lamb,

    1. United States Department of Agriculture, Agricultural Research Service, National Peanut Research Laboratory, Dawson, GA 39842, USA
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  • Victor Sobolev,

    1. United States Department of Agriculture, Agricultural Research Service, National Peanut Research Laboratory, Dawson, GA 39842, USA
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  • Timothy H. Sanders,

    1. Department of Food, Bioprocessing & Nutrition Sciences, North Carolina State University, Raleigh, NC 27695, USA
    2. United States Department of Agriculture, Agricultural Research Service, Market Quality & Handling Research, Raleigh, NC 27695, USA
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  • Jack P. Davis

    Corresponding author
    1. United States Department of Agriculture, Agricultural Research Service, Market Quality & Handling Research, Raleigh, NC 27695, USA
    • Department of Food, Bioprocessing & Nutrition Sciences, North Carolina State University, Raleigh, NC 27695, USA
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Correspondent: E-mail: jack.davis@ars.usda.gov

Summary

Peanut meal, the primary by-product of commercial oil crushing operations, is an excellent source of protein although aflatoxin contamination often limits applications for this material. Naturally aflatoxin-contaminated (59 ppb) peanut meal dispersions were adjusted to pH 2.1 or pH 9.1, with or without additional protease and/or a clay absorbent, and the resulting soluble extracts derived from these dispersions were spray dried. Clay addition during processing minimally affected spray-drying yields, protein powder solubility or antioxidant capacities, whereas these properties were significantly altered by pH and protease treatments. Spray-dried hydrolysates produced from peanut meal treated with clay contained significantly less aflatoxin than hydrolysates produced without clay; the effects of pH or enzyme on aflatoxin content were minimal. Peanut meal treated with Alcalase, and clay yielded spray-dried hydrolysates with enhanced antioxidant capacity and increased solubility compared to unhydrolysed controls and had aflatoxin levels below 1 ppb.

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