【作者】 谷筱玉；

【导师】 汪曣；

【作者基本信息】 天津大学 ， 生物医学工程， 2004， 硕士

【摘要】 中药现代化、国际化的核心问题之一是中药生产的质量控制。其中，建立中药在线检测技术和方法是重要一环。而选择红外光谱法作为在线检测的研究方向，具有十分明显的优势。红外光谱技术取样简单，分析速度快，抗干扰能力强，适于在线应用；通过建立数学模型，可对多成分进行测定；设备简单，结构紧凑，操作方便，成本较低，易于推广。本文选取冰片为主要研究对象，在中红外和近红外两个光谱区域对中药的有效成分含量进行检测，做定性定量的分析研究。中红外区域的分析研究采用了衰减全反射和透射两种方法。由于增加光程有利于样品对红外光的充分吸收，所以光谱数据分析的结果透射方法优于 ATR 方法，并且透射方法下 1mm 光程优于 0.4mm 光程。近红外区域分别针对粉末状和溶液状样品采用漫反射和透射的方法进行分析研究。漫反射方法的实验结果显示该方法可以作为定性分析的方法。在采用漫反射方法进行定量分析时，要充分考虑粉末颗粒度等因素的影响，采用归一的方法对光谱进行处理，可以改善但不能完全消除颗粒度对光谱造成的影响。冰片溶液的透射方法检测的回归建模分析得到的 RMSEP 值为 0.193mg/ml，而在采用波长选择对模型进行优化后，最多可将波长数减少 78％，预测精度提高 39％。本文的研究内容作为在线检测的基础研究为后续的研究奠定了基础，而在线检测的真正实施可以为中药生产精确、即时地提供检测数据，并反馈于生产过程，使过程得到科学高效的控制，保证产品质量的稳定性。更多还原

【Abstract】 One of the most important problems to the modernization of Chinese medicine isto enhance the quality control. Due to the material qualities are irregular, Chinesemedicine is also unstable. So it is necessary to control the quality by using certainquality standards. There are many advantages to use infrared spectrometry asdirection investigated of on-line monitoring of Chinese medicine, such as efficient,rapid, anti-interperence, environmental friendly. In this paper, we started from the fundamental research of on-line detection onChinese medicine and demonstrated the use of middle infrared spectrum (MIR) andnear infrared spectrum (NIR), the tools for quantitative spectrometricmulti-component analysis, for measuring the content of borneol in Chinese medicine. The methods of Attenuate Total Reflection (ATR) and Transmission were appliedto analytical study in MIR. As the longer the optical path length, the more theabsorption of the sample to infrared light, the result of spectra data analysis showedthat the method of Transmission was better than Attenuate Total Reflection, and thepath length of 1mm surpassed 0.4 mm. Aimed at powder sample and solution sample, the methods of diffused reflectionand transmission were applied for investigation in NIR. The result showed that themethod of diffused reflection is suitable for quantitative analysis. The influence ofsample’s graininess should be taken into consideration when using diffused reflectionas a method for quantitative analysis. Normalization can eliminate the influence ofsample’s graininess to a certain extent. Multivariate regression techniques have provided tools for calibration by relatingabsorbance values to concentration levels for many chemical components at manywavelengths. Borneol solution’s results of transmission method showed that RMSEPfor borneol in ethanol solution was 0.193mg/ml，and correlation was up to 0.9998.Wavelengths selection is an important step in modeling. With the design of adedicated instrument for real-time or near-real-time measurements in mind, it isdesirable to simplify the design and minimize the cost. The predictive precisionincrease of 39 percent was obtained, and the number of wavelength is decreased to 22percent of original. Compared with conventional methods, infrared spectroscopy can be used as an<WP=5>nvestigate method for on-line monitoring and quality controlling of effectiveprinciples in Chinese medicine. This method can improve the criterion of qualitycontrolling and accelerate the modernization course of Chinese medicine.更多还原