Journal
MOLECULES
Volume 23, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/molecules23051010
Keywords
FT-IR spectroscopy; chlorophyll; pheophytin; green tea; quantification determination
Funding
- Special Funding Projects for Basic Scientific Research Projects in Universities [2015QNA6005]
- National Natural Science Foundation of China [31771676]
- Zhejiang Province Public Technology Research Program [2015C02008, 2017C02027]
- Zhejiang Province Public Welfare Technology Application Research Project [2014C32091]
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The chlorophyll, pheophytin, and their proportions are critical factors to evaluate the sensory quality of green tea. This research aims to establish an effective method to determine the quantification of chlorophyll and pheophytin in green tea, based on Fourier transform infrared (FT-IR) spectroscopy. First, five brands of tea were collected for spectral acquisition, and the chlorophyll and pheophytin were measured using the reference method. Then, a relation between these two pigments and FT-IR spectroscopy were developed based on chemometrics. Additionally, the characteristic IR wavenumbers of these pigments were extracted and proved to be effective for a quantitative determination. Successively, non-linear models were also built based on these characteristic wavenumbers, obtaining coefficients of determination of 0.87, 0.80, 0.85 and 0.89; and relative predictive deviations of 2.77, 2.62, 2.26 and 3.07 for the four pigments, respectively. These results demonstrate the feasibility of FT-IR spectroscopy for the determination of chlorophyll and pheophytin.
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