Non-destructive determination of total polyphenols content and classification of storage periods of Iron Buddha tea using multispectral imaging system

卷:176

Xiong, Chuanwu ; Liu, Changhong ; Pan, Wenjuan ; Ma, Fei ; Xiong, Can ; Qi, Li ; Chen, Feng ; Lu, Xuzhong ; Yang, Jianbo ; Zheng, Lei

关键词: Multispectral imaging;    Near infrared reflectance spectroscopy;    Total polyphenols;    Non-destructive determination;    Chemometrics;    Iron Buddha tea;   

DOI  :  10.1016/j.foodchem.2014.12.057

学科分类：食品科学和技术

【 摘 要 】

Total polyphenols is a primary quality indicator in tea which is consumed worldwide. The feasibility of using near infrared reflectance (NIR) spectroscopy (800-2500 nm) and multispectral imaging (MSI) system (405-970 nm) for prediction of total polyphenols contents (TPC) of Iron Buddha tea was investigated in this study. The results revealed that the predictive model by MSI using partial least squares (PLS) analysis for tea leaves was considered to be the best in non-destructive and rapid determination of TPC. Besides, the ability of MSI to classify tea leaves based on storage period (year of 2004, 2007, 2011, 2012 and 2013) was tested and the classification accuracies of 95.0% and 97.5% were achieved using LS-SVM and BPNN models, respectively. These overall results suggested that MSI together with suitable analysis model is a promising technology for rapid and non-destructive determination of TPC and classification of storage periods in tea leaves. (C) 2014 Elsevier Ltd. All rights reserved.