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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Relationship between Fresh-Packaged Spinach Leaves Exposed to Continuous Light or Dark and Bioactive Contents: Effects of Cultivar, Leaf Size, and Storage Duration
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Relationship between Fresh-Packaged Spinach Leaves Exposed to Continuous Light or Dark and Bioactive Contents: Effects of Cultivar, Leaf Size, and Storage Duration

机译：新鲜包装的菠菜叶片暴露在连续的光照或黑暗与生物活性含量之间的关系：品种，叶大小和储存时间的影响

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Current retail marketing conditions allow produce to receive artificial light 24 h per day during its displayed shelf life. Essential human-health vitamins [ascorbic acid (vit C), folate (vit B9), phylloquinone (vit K1), α-Tocopherol (vit E), and the carotenoids lutein, violaxanthin, zeaxanthin, and β-carotene (provit A)] also are essential for photosynthesis and are biosynthesized in plants by light conditions even under chilling temperatures. Spinach leaves, notably abundant in the aforementioned human-health compounds, were harvested from flat-leaf 'Lazio' and crinkle-leafed 'Samish' cultivars at peak whole-plant maturity as baby (top- and midcanopy) and larger (lower-canopy) leaves. Leaves were placed as a single layer in commercial, clear-polymer retail boxes and stored at 4 °C for up to 9 days under continuous light (26.9 μmol · m~2·s) or dark. Top-canopy, baby-leaf spinach generally had higher concentrations of all bioactive compounds, on a dry weight basis, with the exception of carotenoids, than bottom-canopy leaves. All leaves stored under continuous light generally had higher levels of all bioactive compounds, except β-carotene and violaxanthin, and were more prone to wilting, especially the flat-leafed cultivar. All leaves stored under continuous darkness had declining or unchanged levels of the aforementioned bioactive compounds. Findings from this study revealed that spinach leaves exposed to simulated retail continuous light at 4 °C, in clear plastic containers, were overall more nutritionally dense (enriched) than leaves exposed to continuous darkness.
机译：当前的零售营销条件允许农产品在其保质期内每天24小时接受人造光。人体必需的维生素[抗坏血酸（vit C），叶酸（vit B9），叶醌（vit K1），α-生育酚（vit E）和类胡萝卜素叶黄素，紫黄质，玉米黄质和β-胡萝卜素（A组） ）对于光合作用也是必不可少的，并且即使在寒冷的温度下也可以在光照条件下在植物中生物合成。菠菜叶，在平整的“ Lazio”和皱叶的“ Samish”品种中，在整个植物的成熟高峰期，从幼叶（上冠层和中冠层）和较大的（下冠层）中收获，尤其富含上述人类健康化合物） 树叶。将叶子单层放置在商业透明聚合物零售盒中，并在连续光照（26.9μmol·m〜2·s）或黑暗下于4°C最多保存9天。除类胡萝卜素外，顶冠层婴儿叶菠菜的所有生物活性化合物的浓度（以干重计）通常比底冠层叶片的浓度更高。在连续光照下保存的所有叶片，除β-胡萝卜素和紫黄质素外，所有生物活性化合物的含量通常都较高，并且更容易枯萎，尤其是平叶品种。在连续黑暗中储存的所有叶片的上述生物活性化合物的含量均下降或保持不变。这项研究的发现表明，在透明塑料容器中暴露于4°C的模拟零售连续光照下的菠菜叶片比暴露于连续黑暗的叶片总体上营养密度更高（富含）。

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