| 近红外光谱法快速测定绿茶的4种主要成分 |
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| 引用本文： | 林新,牛智有,刘梅英,马爱丽.近红外光谱法快速测定绿茶的4种主要成分[J].华中农业大学学报,2009,28(4). |
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| 作者姓名： | 林新 牛智有 刘梅英 马爱丽 |
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| 作者单位： | 华中农业大学工程技术学院,武汉,430070 |
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| 基金项目： | 湖北省自然科学基金项目 |
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| 摘 要： | 应用现代近红外光谱分析技术,建立了绿茶中水分、茶多酚、咖啡碱和游离氨基酸4种主要成分的改进偏最小二乘(MPLS)定标模型,用目标函数法对不同光谱预处理方法进行考查,评定出最优模型,并对其进行了验证.各成分最优模型的目标函数值(f)分别为98.84%、95.66%、95.07%和94.25%,相对标准差(RSD)分别为4.53%、4.57%、8.33%和6.39%,预测决定系数(R2)分别为0.95、0.85、0.63和0.71.测定结果表明:应用近红外光谱分析可以实现绿茶中4种成分的快速定量检测,水分、茶多酚和游离氨基酸模型取得了良好的预测效果,可以用于实际检测;咖啡碱模型预测效果较差,需要进一步优化.
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| 关 键 词： | 近红外光谱 绿茶 成分 快速测定 |
Rapid Determination of Four Kinds of Main Composition in Green Tea by Near Infrared Spectroscopy(NIRS) |
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| LIN Xin,NIU Zhi-you,LIU Mei-ying,MA Ai-li.Rapid Determination of Four Kinds of Main Composition in Green Tea by Near Infrared Spectroscopy(NIRS)[J].Journal of Huazhong Agricultural University,2009,28(4). |
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| Authors: | LIN Xin NIU Zhi-you LIU Mei-ying MA Ai-li |
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| Institution: | College of Engineering and Technology;Huazhong Agricultural University;Wuhan 430070;China |
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| Abstract: | Using modern near infrared spectroscopy(NIRS) analytical technology,the modified PLS calibration models of moisture content,tea polyphenol,caffeine and free amino acids in green tea were established.The effects of different spectral data preprocessing methods were studied with object function method.The optimal NIRS models were evaluated and validated.The values of object function for each optimal model are 98.84%,95.66%,95.07% and 94.25% respectively.The relative standard deviations(RSD) are 4.53%,4.57%,8.... |
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