| Nutritional components and physiologically active substances in the young barley(Hordeum Vulgare,L) leaves have many biological effects such as anti-inflammation, restoring DNA injury,inhibition of infection of HIV,antiulcer and decreasing blood pressure. Dynamic variations of nutritional components and physiologically active substences in young barley leaves were systemically studied .On the other hand, the technics of producing juice powder and antioxidative ability of leaf extract solution were preliminarily studied. The main results and conclusions were as follows.-(1) During the seedlings growth period,the height of plant raised gradually,the fresh weight of leaf per plant increased slowly in the early stage and then quickly after 25 days growth.The leaf/stem ratio on fresh weight declined straightly from 10th day to 25th day and began to increase from the 25th day. The fresh weight of leaf per plant in Xinan 86911 and Chuandamai 34 was higher than in Xinong 242. At the 20th day,the iPA content in the leaf of Xinan86911 was higher than in the leaf of Xinong 242 and Chuandamai 34. The IAA content in the leaf of Xinong 242 was higher than in the leaf of Xinan86911 and Chuandamai34.(2) During the seedlings growth period, the nutritional components and physiologically active substances contents(activities) in young barley leaves had a tendency of elevation at the beginning and descent after their contents reaching the maximum. The contents of protein,soluble sugar,chlorophyll,carotenoid and vitamine C went up rapidly in early stage and declined gradually when their contents reached the maximum. However the content of soluble sugar slowerly went up again from the 25th day.On the other hand ,the activities of SOD and CAT in barley leaves ascended rapidly from early stage and began to descend subsequently when the activities reached the peak. In the leaf of different varieties of barley,the nutritional components and physiologically active substances contents reached their maxium at different time.(3) Compared with the mineral elements contents in the leaf at the 20th day ,the K content in the leaf was higher than other major elements contents.The K content(19.80mg.g"'DW) in the leaf of Chuandamai 34 was obviously higher than in the leaf of Xinong242 (16.00 mg.lg''DW)and Xinan 86911(15.70 mg.g''DW). About the minor elements, the Fe(0.30mg.g"') average content in the leaf was higher than that of Mn(0.046 mg.g''DW),Zn(0.032 mg.g''DW),Cu(0.016 mg.g''DW).(4) With the age of leaf increasing,the nutritional component contents in the leaf per plant ascended accordingly. At the same growth period,the contents in the leaf of Chuandamai34 per plant were the highest, while the contents in the leaf of Xinong 242 per plant were the lowest.(5)The optimal extract condition while producing young barley leaf juice power was that: extract solution^; the ratio between solvents and raw materials,4: 1 ;extract temperature, 10癈,extract time,5 hours.(6)Different extract solvents had different effect on the scavenge rate of -OH.Methanol extract solution had the strongest scavenge abilitiy,while petroleum ether and ethyl acetate extract solution' s scavenge abilities were weak.The ethanol extract solution was the middle.Different concentration of ethanol extract solution had different scavenge ability. 80% ethanol extract solution had higher scavenge ratio of -OH (30.6%) than that of the 30% and 50% ethanol extract solutions. The scavenge rate of-OH was enhanced by prolonging extract temperature and increasing extract time. 80% ethanol extract solution of different barley leaves had different scavenge abilities,the extract solution of Chuangdamai 34 leaves had higher scavenge rate of -OH(35.6%)than that of Xinan 86911(30.6% )and of Xinong 242(33.6%).(7) The ethanol extract of barley leaves had strong antioxidative ability. All barley leaf extract solutions of different concentration can delay the oxidation velocity of lard,.Ethanol extract of 0.1 gram leaves can retard the rancidity time to 8th da...
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