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Soaking and cooking parameters of tepary beans effects of cooking time and cooking temperature on hardness and activity of nutritional antagonists



Soaking and cooking parameters of tepary beans effects of cooking time and cooking temperature on hardness and activity of nutritional antagonists



Qualitas Plantarum Plant Foods for Human Nutrition 36(4): 295-308



Tepary samples were examined for patterns of hydration, dry matter losses during the processes of soaking and cooking, residual hardness in partially cooked samples and heat lability of endogenous proteinaceous antinutritional factors. At 24.degree. C, teparies imbibed water equivalent to their weight (100% hydration) in 4 h and continued to absorb water rapidly for an additional 4 h before reaching an equilibrium hydration. During the processes of soaking and cooking, materials leached from raw beans represented 7.3 and 13.5% of their dry weight, 4.3 and 12.4% of their protein content, 7.1 and 12.2% of their stored carbohydrate and 22.4 and 33.4% of their mineral levels, respectively. In samples prepared at different cooking times (60, 90, 120, 150, 180 min) and cooking temperatures (80, 85, 90, 95.degree. C), longer times and higher temperatures resulted in greater reductions in residual bean hardness; interactive effects of time and temperature treatments were significant. Residual activity of trypsin and chymotrypsin inhibitors in partially-cooked samples appeared to be negligible. In addition, at least 80% of the original hemagglutinating activity of lectins in raw beans was lost during partial-cooking of samples under all cooking regimes.

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Accession: 006429410

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DOI: 10.1007/bf01892351


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