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| 近红外光谱法对茶叶中的咖啡碱含量的快速测定 | |
| 引用本文： | 赵红波,谭红,徐玮,包娜,何锦林,史会兵. 近红外光谱法对茶叶中的咖啡碱含量的快速测定[J]. 中国酿造, 2011, 0(8) |
| 作者姓名： | 赵红波 谭红 徐玮 包娜 何锦林 史会兵 |
| 作者单位： | 1. 贵州大学化学与化工学院,贵州贵阳550002;贵州省理化测试分析研究中心,贵州贵阳550002 2. 贵州省理化测试分析研究中心,贵州贵阳,550002 3. 贵州大学化学与化工学院,贵州贵阳,550002 |
| 基金项目： | 贵州省科技厅农业攻关项目[黔科合NY字(2009)3021]; 贵州省国际科技合作计划[黔科合外G字(2009)700131] |
| 摘 要： | 以贵州省各地茶叶为研究对象,以近红外光谱分析技术快速检测茶叶中的咖啡碱含量为目的,将茶叶制成粉末进行光谱扫描并用化学法测定其咖啡碱含量,将偏最小二乘法与傅立叶变换近红外光谱法相结合,建立茶叶中咖啡碱含量的模型.通过多元散射校正(MSC)处理光谱,光谱范围选择4493.33cm-1～4354.48cm-1,5800.83cm-1～5696.69cm-1,主因子数为10,得到模型的内部交互验证相关系数(P)为0.991,交互验证均方差(RMSECV)为0.205；模型的预测值与化学测定值的相关系数为0.999,预测标准偏差(RMSEP)为0.242.通过稳定性试验得到的RSD都在0.30％以下.结果表明,模型的预测效果很好,具有较高的精密度和较好的稳定性,且方法简捷,能满足茶叶中咖啡碱的快速检测要求. |
| 关 键 词： | 近红外光谱法 偏最小二乘法 咖啡碱 模型 |
Rapid determination of caffeine in the tea by NIR spectroscopy |
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| ZHAO Hongbo,TAN Hong,XU Wei,BAO Na,HE Jinlin,SHI Huibing. Rapid determination of caffeine in the tea by NIR spectroscopy[J]. China Brewing, 2011, 0(8) | |
| Authors: | ZHAO Hongbo TAN Hong XU Wei BAO Na HE Jinlin SHI Huibing |
| Affiliation: | ZHAO Hongbo1,2,TAN Hong2,XU Wei1,BAO Na1,HE Jinlin2,SHI Huibing1(1.College of Chemical Engineering and Chemistry,Guizhou University,Guiyang 550002,China,2.Guizhou Research Center of Physical Test and Chemical Analysis,China) |
| Abstract: | The caffeine concentrations in tea from Guizhou province were determined by near infrared(NIR) spectroscopy.The tea spectral was scanned after became powder and the caffeine content were detected by chemical method.A calibration model was established based on Fourier Transform Near Infrared Spectroscopy with partial least square.According to the multiplicative signal correction processing method,the selected spectra ranges were chosen at 4493.33cm-1~4354.48cm-1 and 5800.83cm-1~5696.69cm-1.The principal fact... |
| Keywords: | near infrared spectroscopy partial least squares caffeine model |
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