1. Introduction
Vegetable soybean is a specialty food-type soybean harvested while the seeds are still immature at R6 stage It is similar to field matured soybean except for its larger seeds and lighter hilum color Vegetable soybean has advantages in sensory attributes over mature soybean, such as green color, soft texture, large seed size, slightly sweet taste, and less objectionable beany flavor. In addition, vegetable soybean is higher in nutritional content than mature soybean, including higher ascorbic acid and b-carotene contents, and lower amounts of indigestible oligosaccharides and anti-nutritional substances such as trypsin-inhibitors and phytates If properly stored, fresh vegetable soybean can retain its flavor and appearance for a short time period. The two most important sensorial attributes for vegetable soybean are sweetness and savory taste. The sweet taste comes from its high sucrose content, and the