용암해수로 재배한 콩나물의 특성

Abstract

This study aimed to examine the cultivation characteristics of soybean sprouts enhanced with inorganic contents using magma seawater in order to improve the quality and functionality of soybean sprouts as one of the Korean traditional food. This investigation used soybean (Glycine max L.) with a 100-seed weight of 8.93, a long axis of 6.19mm, a short axis of 4.46mm, and a thickness of 5.33mm as the material for growing soybean sprouts. The pH of magma seawater and electrodialized magma seawater used for cultivation ranged between 7.51-7.57 comparable to a drinking water pH of 7.13. Meanwhile, EC was 67.5-253 times higher. The most abundant inorganic substance of magma seawater was Cl at 18,950mg/100g, followed by Na at 9,616mg/100g, SO4 at 2,475.5, K at 393.5 and Ca at 384.3. In contrast, the contents of Na and Cl were lower in electrodialized magma seawater. Water absorption rate increased rapidly for 8 hours after soaking in soybean sprouts cultivated with magma seawater. Water absorption rate was highest at 156.2% in 25% electrodialized seawater, and decreased as the concentration of cultivation water increased. Germination rate was greater than 99% in drinking water, 12.5%, 25% and 50% electrodialized magma seawater, and 12.5% magma seawater. However, germination rate was poor in magma seawater at a concentration greater than 50%. The outcome is thought to be attributable to magma seawater level caused by osmotic pressure and others. The length of soybean sprouts cultivated for 5 days was longest at 16.7cm in drinking water, followed by 14.6cm in 25% electrodialized magma seawater. The weight of soybean sprouts was heaviest at 0.52g in drinking water, followed by 0.50g in 25% electrodialized magma seawater. The length of embryonic axis of soybean sprouts was longest at 77.8mm in drinking water, followed by 69.5mm 25% electrodialized magma seawater. Fine roots were most abundant in sprouts cultivated in drinking water and electrodialized magma seawater. Likewise, the growth of soybean sprouts was poor with short length and heavy weight as the concentration of cultivation water increased. The yield rate of soybean sprouts cultivated in 25% electrodialized magma seawater was 562.0% which was lower than that of sprouts cultivated in drinking water at 599.7%. Yield rate was lower as the concentration of cultivation water was higher. Moreover, the rate of cotyledon formaiton was high, indicating low quality. In regards to the inorganic substances of soybean sprouts cultivated in magma seawater, there was no difference in the contents of P and K according to cultivation water levels. On the other hand, the contents of Mg, Na and B were higher as the concentration of cultivation water increased. The content of Ca was low in soybean sprouts as cultivation water level increased. The inorganic contents of cotyledon showed a decreasing tendency compare to those of embryonic axis as cultivation water level increased. The overall inorganic contents of soybean sprouts increased as the concentration of magma seawater increased.