UNLABELLED A new chemiluminescence (CL) system based on the CL-emitting reaction between potassium tetrabromoaurate (III) [Au(III)] and luminol in alkaline medium is described in this paper. On the basis of this study, folic acid (FA) could dramatically enhance CL intensities, and incorporated with flow injection (FI) and solid-phase extraction (SPE), the novel CL system has been applied for the determination of FA in infant formula milk powder. Under optimum conditions, the CL intensities were linearly related to the concentration of FA in the range of 8.0 × 10⁻⁸ to 4.0 × 10⁻⁵ g/L with a correlation coefficient of 0.999, and the detection limit was 2.0 × 10⁻⁸ g/L. The relative standard deviation was 3.5% for 1.0 × 10⁻⁶ g/L FA. The optimal conditions for the detection of FA were evaluated, and the interferences from some common inorganic ions and a couple of relevant organic compounds were also investigated. PRACTICAL APPLICATION The new Au(III)-luminol chemiluminescent system is proposed for the determination of FA; it will be an adequate technique for the analysis of low FA concentrations in pharmaceutical preparations and food samples, and it will have potential analytical applications for other substances.

中文翻译：

---

一种用于测定奶粉中叶酸的新型四溴金酸钾 (III)-鲁米诺化学发光系统

未标记 本文描述了一种基于四溴金酸钾 (III) [Au(III)] 和鲁米诺在碱性介质中发出 CL 的反应的新型化学发光 (CL) 系统。在本研究的基础上，叶酸 (FA) 可以显着提高 CL 强度，并结合流动注射 (FI) 和固相萃取 (SPE)，新型 CL 系统已应用于测定婴儿配方奶粉中的 FA牛奶粉。在最佳条件下，CL强度与FA浓度线性相关，范围为8.0×10⁻⁸至4.0×10⁻⁵g/L，相关系数为0.999，检出限为2.0×10⁻⁸克/升。对于 1.0 × 10⁻⁶ g/L FA，相对标准偏差为 3.5%。评估了检测 FA 的最佳条件，还研究了一些常见无机离子和一些相关有机化合物的干扰。实际应用 提出了新的 Au(III)-luminol 化学发光系统来测定 FA；它将是分析药物制剂和食品样品中低 FA 浓度的合适技术，并且对其他物质具有潜在的分析应用。