Department of Chemistry, Virginia Military Institute, Lexington, VA 24450, USA.
Biometals. 2011 Dec;24(6):1005-15. doi: 10.1007/s10534-011-9458-x. Epub 2011 May 17.
Red, purple, and blue sepals on selected cultivars of Hydrangea macrophylla were analyzed for their aluminum content. This content was determined to be a function of the sepal color with red sepals possessing 0-10 μg Al/g fresh sepal, purple sepals having 10-40 μg Al/g fresh sepal, and blue sepals containing greater than 40 μg Al/g fresh sepal. Accordingly, the threshold aluminum content needed to change H. macrophylla sepals from red to blue was about 40 μg Al/g fresh sepal. Higher aluminum concentrations were incorporated into the sepals, but this additional aluminum did not affect the intensity or hue of the blue color. These observations agreed with a chemical model proposing that the concentration of the blue Al(3+)-anthocyanin complex reached a maximum when a sufficient excess of aluminum was present. In addition, the visible absorbance spectra of harvested red, purple, and blue sepals were duplicated by Al(3+) and anthocyanin (delphinidin-3-glucoside) mixtures in this model chemical system.
对绣球花（Hydrangea macrophylla）的一些品种的红色、紫色和蓝色萼片进行了铝含量分析。结果表明，萼片颜色与铝含量之间存在一定的关系，其中红色萼片的铝含量为 0-10μg/g 鲜重，紫色萼片的铝含量为 10-40μg/g 鲜重，蓝色萼片的铝含量大于 40μg/g 鲜重。因此，使绣球花萼片由红色变为蓝色所需的铝含量阈值约为 40μg/g 鲜重。虽然更多的铝被结合到萼片中，但这并没有影响蓝色的强度或色调。这些观察结果与一个化学模型一致，该模型提出，当存在足够过量的铝时，蓝色 Al(3+)-花青素配合物的浓度达到最大值。此外，在这个模型化学体系中，用 Al(3+)和花青素（矢车菊素-3-葡萄糖苷）混合物可以复制收获的红色、紫色和蓝色萼片的可见吸收光谱。
Zotero 插件