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当前位置: 首页 > 文章 > 傅里叶变换近红外光谱技术测定绿茶全氮量 食品科学 2014,35 (8) 147-151
Position: Home > Articles > Determination of Total Nitrogen in Green Tea by Fourier Transform Near Infrared Spectroscopy FOOD SCIENCE 2014,35 (8) 147-151

傅里叶变换近红外光谱技术测定绿茶全氮量

作  者：
杨丹;刘新;张颖彬;尹鹏
单  位：
中国农业科学院茶叶研究所,农业部茶叶质量监督检验测试中心;中国农业科学院茶叶研究所
关键词：
近红外光谱技术;绿茶;全氮量;子模型
摘  要：
建立准确性高、稳定性好的绿茶全氮量的偏最小二乘定量分析模型。在4 691~3 959、5 126~4 848 cm-1波段区间内,光谱经过一阶导数与平滑处理后,模型的预测性能最好,外部验证集样品的预测值与实测值的预测均方差(RMSEP)为0.092 5%,相关系数为0.993 9。根据嫩度等级,建立了绿茶全氮量子模型,提高了模型的预测性能。嫩度为3级的子模型预测结果最好,验证集样品的全氮量的预测值与实测值的RMSEP值最小,为0.037 9%,相关系数为0.996 1。绿茶全氮量近红外光谱检测技术是一种绿色、快速、高效的新型分析技术,能够实现快速测定绿茶全氮量,评价绿茶品质。
译  名：
Determination of Total Nitrogen in Green Tea by Fourier Transform Near Infrared Spectroscopy
作  者：
YANG Dan;LIU Xin;ZHANG Ying-bin;YIN Peng;Tea Quality and Supervision Testing Center Ministry of Agriculture, Tea Research Institute of Chinese Academy of Agriculture Science;
关键词：
near infrared spectroscopy;;green tea;;total nitrogen content;;sub-model
摘  要：
A highly ac curate and stable calibration model of total nitrogen content in green tea was established based on partial least square regression. The m odel demonstrated great predictive performance after the first derivative processing and smoothing in the spectral range of 4 691–3 959 cm-1 and 5 126–4 848 cm-1. The correlation coefficient of predicted and chemically measured values in the validation set was 0.993 9 and the RMSEP was 0.092 5%. The prediction performance was improved by developing sub-models of total nitrogen in green tea according to different tenderness. The prediction performance of the tenderness level 3 model was the best. The RMSEP in the validation set was the smallest, 0.037 9%, and the correlation coefficient was 0.996 1. Thus, near infrared spectroscopy can provide a green, rapid and efficient technique for the detection of total nitrogen in green tea and quality evaluation.

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