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25 November 2009 Principle and application of portable NIR tea drinks analyzer
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Tea polyphenols (Tp) and free amino acids (Aa) are the most important quality materials in tea drinks. Due to the high number of samples to be analyzed, new analytical techniques providing fast and reliable data about the quality are essential. Therefore, a portable near-infrared spectroscopy (NIR) analyzer was developed for real-time, continuous and quantitative determination of Tp and Aa in tea drinks. The portable NIR tea drinks analyzer is composed of a lamphouse, a temperature-controlled sample chamber, an optical fiber and an InGaAs array mini grating spectrometer. The analyzer is compact, lightweight and robust with no movable elements. The software with the functions of spectrum acquisition, model establishment, method selection and real-time analysis was also developed for the analyzer. Using partial least squares (PLS) regression, the calibration models for the quantification of Tp and Aa were established with reference to the GB methods (the national standard methods). The values of root mean square error of cross validation (RMSECV) of the models for Tp and Aa calibration were 0.059 mg/mL, 0.005 mg/mL, the values of the correlation coefficients (R2) were 0.99 and 0.98 respectively. The relative standard deviation (RSD) of ten repetitive testing were 3.17% and 4.15%. It suggested that the portable NIR tea drinks analyzer could be a fast and reliable alternative for tea drinks quality testing.
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Liyi Jiang, Huacai Chen, and Fuli Liu "Principle and application of portable NIR tea drinks analyzer", Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 750608 (25 November 2009);

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