Two hydroxyanthraquinones, alizarin and purpurin, that have been used throughout history as a natural pigment, were extracted from roots of Rubia tinctorum from Serbia. As substances with important chemical activities and, therefore, with wide applications (for example in dyeing textile fabrics as well as in pharmacy because of their anti-inflammatory, anti-cancer, antiviral, antimicrobial and antioxidant activities, etc.) they were analyzed in the kinetically very sensitive Bray–Liebhafsky (BL) oscillatory reaction. However, although they are both, hydroxyanthraquinones it is shown that their interactions with BL nonlinear reaction system differ significantly. Consequently, two different reactions were used to explain the mechanism of their chemical activities. The numerical simulations based on a standard model of the BL oscillatory reaction together with proposed reactions due to alizarin/purpurin interactions with a matrix are correlated with experimental investigations. Moreover, it is shown that very small amounts of alizarin and purpurin (from about 1 × 10^–7 M) produce the response of the BL matrix such that micro-quantitative analysis based on the BL oscillatory reaction can be successfully performed in this reaction system. The linear response of the BL matrix on the presence of alizarin and purpurin (necessary for microquantitative determination) is analyzed as a function of two concentration sensitive parameters: pre-oscillatory period τ₁ and potential shift after perturbation ΔE.

从塞尔维亚的茜草根中提取了两种羟基蒽醌，茜素和紫嘌呤，它们在整个历史上一直被用作天然色素。作为具有重要化学活性并因此得到广泛应用的物质（例如，由于其抗炎，抗癌，抗病毒，抗微生物和抗氧化等作用，因此在染色织物以及在制药中均得到应用）。）在动力学非常敏感的Bray–Liebhafsky（BL）振荡反应中进行了分析。然而，尽管它们都是羟基蒽醌，但它们与BL非线性反应体系的相互作用存在显着差异。因此，使用了两种不同的反应来解释其化学活性的机理。基于BL振荡反应的标准模型以及由于茜素/紫嘌呤与基质相互作用引起的拟议反应的数值模拟与实验研究相关。此外，结果表明，很少量的茜素和紫嘌呤（约1×10 ^–7 M）产生BL矩阵的响应，使得可以在该反应系统中成功地进行基于BL振荡反应的微定量分析。茜素和红紫素（必要microquantitative确定）的存在下，BL矩阵的线性响应被分析为两个浓度敏感参数的函数：预振荡周期τ ₁和扰动后ΔE电位漂移。