Nutrient and antinutrient content of an underexploited Malawian water tuber Nymphaea Petersiana (Nyika)* |
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| Authors: | Chrissie M. Chawanje William E. Barbeau Ingolf Grün |
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| Affiliation: | 1. Department of Applied Sciences , University of Malawi, The Polytechnic , P/Bag 303, Chichiri, Blantyre3, Malawi, Africa;2. Department of Human Nutrition, Foods and Exercise , Virginia Polytechnic Institute and State University , Blacksburg, VA, 24061, USA;3. Department of Food Science and Nutrition , University of Missouri , Columbia, MO, 65211, USA |
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| Abstract: | Uncooked/sun‐dried (UCSD) and boiled/freeze‐dried (BFD) flours of the Malawian water tuber Nymphaea petersiana (Nyika) were analyzed for selected nutrients and antinutrients. On a wet weight basis, the flours contained 8.1 and 8.0% crude protein; 0.8 and 1.0% crude fat; 12.0 and 13.0% dietary fiber; and 2.2 and 1.9% ash, respectively. The flours also contained 928 and 1300 μg/g of calcium; 2600 and 2200 μg/g of phosphorus; 88 and 20 μg/g of iron; and 22 and 20 μg/g of zinc, respectively. USCD and BFD flours were limiting in lysine and had amino acid scores of 91 and 84. The predominant fatty acids in the tubers were oleic (47%), linoleic (32%), palmitic (21%), and linolenic (7%). Tannin content was 1.5 and 1.0%; phytate content was 5.4 and 3.9 μg/g; trypsin activity was reduced from 400 to 55 TIU/g of tuber and chymotrypsin activity was reduced from 240 to 50 CIU/g by moist heat. Hydrogen cyanide levels were below detection limits (LOD < 16 nmoles/L) for both UCSD and BFD flour samples. |
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| Keywords: | Nymphaea petersiana Malawian water tuber |
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