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首页> 外文OA文献 >Changes in the isoflavone concentration in red clover (Trifolium pratense L.) during ensiling and storage in laboratory-scale silos
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Changes in the isoflavone concentration in red clover (Trifolium pratense L.) during ensiling and storage in laboratory-scale silos

机译：在实验室规模的筒仓中封存和储存过程中红三叶草（Trifolium pratense L.）中异黄酮浓度的变化

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Isoflavones constitute one of the most common categories of nonsteroidal estrogen-like substances belonging to the broad group of phytoestrogens. The highest concentrations in the plant kingdom are found in the Fabaceae family. They have become a focus of research because of their estrogenic or anti-estrogenic effect and potential impact on human health. In recent years, several studies have focused on the impact of biotic and abiotic factors and farming management on the isoflavone concentration in plants and their impact on the composition of cow’s milk. Nevertheless, knowledge about the effect of the ensiling process on isoflavone concentration remains limited. The objective of this work was to study the evolution of the concentrations of four compounds (daidzein, formononetin, genistein and biochanin A) in red clover (Trifolium pratense L.) ensiled at harvest. The impact of the field-drying process was also assessed. The plant material was ensiled in laboratory scale silos using vacuum-packed plastic bags and stored over a 6-month period. The quality of the silages was checked throughout the experiment by determining the pH, lactic acid concentration, volatile fatty acids, crude proteins, cellulose and other chemical characteristics. The isoflavone concentration in fresh plant material was 2050, 1766, 306 and 127 µg/g DM for formononetin, biochanin A, genistein and daidzein, respectively. After 4 days of drying in the field, no significant change in isoflavone concentration was found, except for daidzein, which increased twofold. The laboratory-scale silos experiment, however, showed a decrease in isoflavone concentration during the first 2 weeks, followed by stabilization over the 5 remaining months. The concentrations fell by 26, 39, 66 and 73% for daidzein, genistein, biochanin A and formononetin, respectively. Animals fed with silage would therefore absorb fewer isoflavones than those fed with fresh plant material or hay.
机译：异黄酮是非甾体类雌激素中最常见的一种，属于大量植物雌激素。植物界中的最高浓度存在于豆科中。由于它们的雌激素或抗雌激素作用以及对人体健康的潜在影响，它们已成为研究的重点。近年来，一些研究集中在生物和非生物因素以及耕作管理对植物中异黄酮浓度的影响及其对牛乳成分的影响。然而，关于包衣过程对异黄酮浓度影响的知识仍然有限。这项工作的目的是研究青贮的红三叶草（Trifolium pratense L.）中四种化合物（大豆苷元，formononetin，染料木黄酮和生物素A）的浓度变化。还评估了田间干燥过程的影响。使用真空包装的塑料袋将植物材料包裹在实验室规模的筒仓中，并保存6个月。在整个实验过程中，通过确定pH，乳酸浓度，挥发性脂肪酸，粗蛋白，纤维素和其他化学特性来检查青贮饲料的质量。新鲜植物素中异黄酮的浓度为formononetin，biochanin A，genistein和daidzein分别为2050、1766、306和127 µg / g DM。在田间干燥4天后，除大豆苷元增加了两倍外，未发现异黄酮浓度发生显着变化。然而，实验室规模的筒仓实验显示，在最初的2周中，异黄酮的浓度降低了，随后在剩余的5个月中稳定下来。大豆苷元，染料木黄酮，生物chanin A和formononetin的浓度分别下降了26％，39％，66％和73％。因此，饲喂青贮饲料的动物吸收的异黄酮要少于饲喂新鲜植物材料或干草的动物。

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