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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Formation of Natural Indigo Derived from Woad (Isatis tinctoriaL.) in Relation to Product Purity.
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Formation of Natural Indigo Derived from Woad (Isatis tinctoriaL.) in Relation to Product Purity.

机译：从Woad（Isatis tinctoriaL。）衍生的天然靛蓝与产品纯度的关系。

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摘要

There is an increasing commercial demand for naturally sourced indigo that meets the purity standards set by the synthetic product. This study concerns the indigo made from leaves of woad (Isatis tinctoria L.), and in particular its interaction with particulate impurities arising from soil and plant materials. Also, a more reliable method using N-methyl-2-pyrrolidone has been developed for the spectrophotometric determination of indigo. In a novel application of fluorescence spectroscopy, indoxyl intermediates in indigo formation are shown to be stable for minutes. The main indigo precursor from woad can be adsorbed onto Amberlite XAD16 in conformity with a Langmuir isotherm, but indigo precursors break down on this and other resin beads to yield indigo and red compounds. Indigo made from indoxyl acetate aggregates into particles, the size distribution of which can be modified by the inclusion of a fine dispersion of calcium hydroxide. Bright field microscopy of indigo products made under defined conditions and scanning electron microscopy combined with energy-dispersive X-ray analysis reveal the relationship of indigo with particulate materials. A model illustrating the interaction of indigo with particulate contaminants is developed on the basis of the results obtained, and recommendations are made for improving the purity of natural indigo.
机译：满足合成产品设定的纯度标准的天然来源靛蓝的商业需求正在增加。这项研究关注的是用羊毛叶（Isatis tinctoria L.）制成的靛蓝，特别是其与土壤和植物材料产生的颗粒杂质的相互作用。另外，已经开发出一种更可靠的方法，使用N-甲基-2-吡咯烷酮进行靛蓝的分光光度测定。在荧光光谱的新应用中，靛蓝形成中的吲哚中间体显示出在数分钟内稳定。 woad的主要靛蓝前体可以按照Langmuir等温线吸附在Amberlite XAD16上，但是靛蓝前体在该树脂和其他树脂珠上分解，生成靛蓝和红色化合物。由乙酸吲哚酚制成的靛蓝会聚集成颗粒，可以通过加入氢氧化钙的细分散体来改变其尺寸分布。在限定条件下制备的靛蓝产品的明场显微镜和扫描电子显微镜与能量色散X射线分析相结合，揭示了靛蓝与颗粒物质的关系。根据获得的结果，开发了一个模型，该模型说明了靛蓝与颗粒污染物的相互作用，并提出了改善天然靛蓝纯度的建议。

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