کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5132848 | 1492059 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Se-fortification reduced antioxidants, sulphur compounds, and increased SMSeC.
- Se dose and developmental stage determine largely the behaviour of the system.
- The saturation concentration of seleno-methyl-selenocysteine is 3.13 µmol gâ1 DM.
- Above 2Â mmol sodium selenate the phenolic compounds decrease significantly.
Selenium (Se) exerts many effects beneficial to health. Broccoli is a Se-hyperaccumulator plant, with Se-fertilization increasing its potential as a functional food. We studied the effect of dose, and the developmental stage at the beginning of Se-fortification, on antioxidant capacity, phenolics, glucosinolates, sulphoraphane, Se-methyl selenocysteine and myrosinase in broccoli. Se-fortification decreased the antioxidant properties and sulphur-containing compounds, but increased Se-methyl-selenocysteine content. Regression models gave r > 0.77 confirming that Se dose and developmental stage largely determine the behaviour of the system. Correlation models gave r > 0.95, allowing estimation of saturation concentration of Se-methyl-selenocysteine in broccoli cv. Traditional (3.13 µmol gâ1 DM) and the concentration (2-mmol sodium selenate) above which the content of phenolic compounds decreases significantly. Sulphoraphane and glucosinolates' dependence on total Se supply was consistent with myrosinase activity below 3.5-mmol sodium selenate. Our results would enable design of optimal fertilization strategies to enrich broccoli in Se with minimal impairment of antioxidants properties.
Journal: Food Chemistry - Volume 233, 15 October 2017, Pages 492-499