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【答案】应助回帖
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爱与雨下(金币+2): 2012-01-02 09:57:13
hmily601(金币+100, 翻译EPI+1): ★★★★★最佳答案 谢谢 辛苦了哈！ 2012-01-03 21:43:33
Flowering of Pitaya is concentrated in 5-11 months per year, which is up to 15 times with large output. The director of the dragon fruit plant buds emerges after 40 - 50 days in the night under suitable temperature conditions. Pitaya flowers are of tubular and about 20 cm wide with mainly white and a few red petals [8]. Pitaya flowers are low in calories and contain vitamin C, protein, crude fiber, crude fat and other nutrients as well as a wealth of mineral elements. They can be used as detoxification tea that is good for Yin and lungs [9-10]. In addition, the dragon fruit flower is also good for eyesight, and it could reduce pathogenic fire and prevention of hypertension. Besides, it can be used to treat cough, asthma, and the dragon fruit flower role could be in support of curing tuberculosis, bronchitis, the treatment of cervical lymph nodes [11-13].
At present, more attention has been paid to the development of dragon fruit juice for health, dried process and nutritional analysis. However, seldom research has been carried out yet on its antioxidant activity [14]. The antioxidant capacity and ability to restore the reduction of peroxide are closely related with inactive free radicals and the ability to capture metal ions. Free radical reagent can make the color change. The content of free radicals could be measured indirectly according to the changes in absorbance values which is the basic principle of spectrophotometry. By measuring the scavenging and reducing power and antioxidant activity different extracts from dragon fruit flowers on DPPH radical, hydroxyl free base (.OH), superoxide anion radical (.O2-), the activity of such extracts was investigated and a comparison has been made with the synthetic antioxidant BHT antioxidant. This will provide some theoretical basis for the comprehensive development and rational utilization of dragon fruit flowers.
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