Winged bean in human nutrition.

Protein calorie malnutrition is prevalent in many developing countries of the tropics and subtropics. Improvement of protein supply to meet the demand of a growing population necessitates utilization of unconventional protein sources. Winged bean, a high protein crop, is one of the important underexploited legumes of the tropics. All the plant parts, viz., seeds, immature pods, leaves, flowers and tubers are edible. Mature seeds contain 29 to 37% proteins and 15 to 18% oil. It has fairly good amounts of phosphorus, iron, and vitamin B. Essential amino acid composition of winged bean is very similar to that of soybean. The fatty acid composition is very much comparable to groundnut. It contains relatively high amounts of behenic acid and parinaric acid. The trypsin inhibitor in winged bean has been shown to be heat resistant. Other toxic factors such as hemagglutinins and cyanide have also been reported. Winged bean seeds are hard to cook. Soaking of seeds in the Rockland's soak solution containing sodium bicarbonate, sodium carbonate, sodium chloride, and sodium pyrophosphate reduces cooking time significantly. The potential uses of this important crop in human nutrition and future research needs are discussed.