To discover new standard for the standardization of bulbs of Allium fistulosum (Chongbaek, Korean herbal name), twelve compounds (1–12) were isolated. Among them, a new HPLC/UV analysis method by selecting the five cinnamic acid amides (5–9) and two decursidate isomers (10 and 11), was fully validated. The developed analysis method showed sufficient reproducibility (< 2.58%) and accuracy (96.00–106.72%). Moreover, among compounds 5–11, only trans-isomers were verified from all four Chongbaek samples which produced in different regions, and this finding implied that the cis-forms were not originally nature compounds, thus, it led us to verify the conversion processes. The four trans-standard solutions and extracts of Chongbaek were converted to the cis- derivatives after 96 h of UV (254 nm) light exposure as 78.74% (6), 82.29% (8), and 63.99% (11) in solution and 82.38% (6), 62.91% (8), and 61.64% (11) in extracts. A verified analysis method using new indicators was developed for quality control of Chongbaek, as well as their stability control under UV light exposure. These results might be important for the industrial use of Chongbaek.

中文翻译：

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葱属鳞茎的几何异构体及其转化的验证研究

为了发现标准化葱属鳞茎鳞茎鳞茎鳞茎的新标准（崇白，韩国草药名称），分离了十二种化合物（1–12）。其中，通过选择五种肉桂酸酰胺（5-9）和两种癸二酸酯异构体（10和11）的新HPLC / UV分析方法得到了充分验证。发达的分析方法显示出足够的重现性（<2.58％）和准确性（96.00–106.72％）。此外，在化合物5-11中，仅在四个在不同区域产生的崇白样品中验证了反式异构体，这一发现暗示顺式不是最初的自然化合物，因此，我们使它验证了转化过程。崇白的四种超标溶液和提取物在紫外线（254 nm）照射96 h后分别转化为顺式衍生物，分别为78.74％（6），82.29％（8）和63。溶液中的含量为99％（11），萃取液中的含量为82.38％（6），62.91％（8）和61.64％（11）。开发了使用新指标的经过验证的分析方法，用于崇白的质量控制以及在紫外线照射下的稳定性控制。这些结果对于崇白的工业应用可能很重要。