红外光谱结合化学计量学对不同采收期滇重楼的定性定量分析

doi:10.3964/j.issn.1000-0593(2017)06-1754-05

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Abstract In order to provide a scientific basis tor find out the best harvest time. Fourier transform infrared (FT-IR) spectroscopy combined with partial least squares discriminant analysis (PLS-DA) and partial least squares regression (PLSR) were used for the identification and evaluation of Paris polyphylla var. yunnanensis from different harvest times. Infrared spectra of 46 samples from different harvest times were collected. The original spectra were pretreated with automatic baseline correction, ordinate normalization, automatic smoothing and wavelet denosing prior to PLS-DA. The contents of polyphyllin Ⅰ, Ⅱ, Ⅵ and Ⅶ were determined with ultra performance liquid chromatography (UPLC). The PLSR model was established combining the spectral data with the reference data performed by UPLC data for evaluating the quality of polyphyllin Ⅰ, Ⅱ, Ⅵ and Ⅶ after the preprocessing of automatic baseline correction, ordinate normalization, automatic smoothing, first derivative and Orthogonal signal correction (OSC). Results showed that: (1) The main absorptions of the original spectra were in the ranges of 950~700, 1 200~950, 1 800~1 500 and 2 800~3 500 cm^-1. (2) The PLS-DA score plot could accurately distinguish P. polyphylla var. yunnanensis from different harvest times. (3) According to the UPLC data, it was found that the total content of polyphyllin Ⅰ, Ⅱ, Ⅵ and Ⅶ got a fold increase, then elicited a decline, and finally showed a slow upward trend with the growth period. (4)There was no significant differences between the predicted value based on quantitative model and measured value with UPLC, and the effect of the model was good. FT-IR spectroscopy combined with chemometrics could clearly distinguish P. polyphylla var. yunnanensis from different harvest times and reach a fast prediction for the content of polyphyllin. Furthermore, it could provide a method for distinguishing and forecasting polyphyllin and a theoretical basis for best harvest time of P. polyphylla var. yunnanensis.

Key words：Infrared spectroscopy; Harvest times; Paris polyphylla Smith var. yunnanensis; Polyphyllin; PLS-DA; PLSR

Received: 2016-01-21 Accepted: 2016-05-16

ZTFLH:

R282.5

Corresponding Authors: WANG Yuan-zhong, ZHANG Jin-yu E-mail: boletus@126.com; jyzhang2008@126.com

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2017)06-1754-05 OR https://www.gpxygpfx.com/EN/Y2017/V37/I06/1754

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