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  • Ký hiệu PL/XG: 615.3
    Nhan đề: Geographic origin classification and simultaneous determination of methylxanthines in vietnamese tea using chemometrics based on the near infrared reflectance spectroscopy /
DDC 615.3
Nhan đề Geographic origin classification and simultaneous determination of methylxanthines in vietnamese tea using chemometrics based on the near infrared reflectance spectroscopy / Tran Thi Hue, Bui Duc Tho, Nguyen Van Ri, Ta Thi Thao
Thông tin xuất bản Ho Chi Minh city : Nguyen Tat Thanh University, 2019
Mô tả vật lý 8 p.
Tóm tắt This paper reported the results of classification of geographic origin and simultaneous analysis of three methylxanthines (caffeine, theobromine, theophylline) in Vietnamese tea samples by the infrared reflectance spectrophotometry coupled with chemometrics. The spectral range was 10,000-4,000cm-1 and each spectrum was measured at 2 cm-1 intervals. For the purpose of geographic origin classification, this study used FT-NIR spectroscopy combined with Partial Least Squares Discriminant Analysis (PLS-DA), and Principal Component Analysis-Discriminant Analysis (PCA-DA). The ability to determine the origin of tea samples in the prediction set of PLS-DA model is 100%. Using the same IR spectral database combined with the partial least squares (PLS), three methylxanthines in tea samples are also quickly quantified. The PLS model based on the spectra of 24 tea samples in which the contents of 3 analytes were determined by high performance liquid chromatography- HPLC) were applied for simultaneous determination of caffeine, theobromine and theophylline in samples. The determination of methylxanthines in 7 tea samples in test set gave the good accuracy of the PLS model. The correlation coefficients (R2) in the prediction set were of 0.9582, 0.8894 and 0.9303 for theobromine, theophylline, and caffeine, respectively. This work demonstrated that infrared reflectance spectrophotometry combined with chemometrics could be applied to rapidly classify the geographic origin and simultaneous determination of main contents in green tea.
Từ khóa tự do Caffeine
Từ khóa tự do Infrared reflectance spectrophotometry
Từ khóa tự do Multivariable
Từ khóa tự do Regression
Từ khóa tự do Theobromine
Từ khóa tự do Theophylline
Từ khóa tự do Cây chè
Tác giả(bs) CN Bui, Duc Tho
Tác giả(bs) CN Nguyen, Van Ri
Tác giả(bs) CN Tran, Thi Hue
Tác giả(bs) CN Ta, Thi Thao
Nguồn trích Journal of Science and Technology - NTTU2019p. 33-40 Số: 06
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082 |a615.3
245 |aGeographic origin classification and simultaneous determination of methylxanthines in vietnamese tea using chemometrics based on the near infrared reflectance spectroscopy / |cTran Thi Hue, Bui Duc Tho, Nguyen Van Ri, Ta Thi Thao
260 |aHo Chi Minh city : |bNguyen Tat Thanh University, |c2019
300 |a8 p.
520 |aThis paper reported the results of classification of geographic origin and simultaneous analysis of three methylxanthines (caffeine, theobromine, theophylline) in Vietnamese tea samples by the infrared reflectance spectrophotometry coupled with chemometrics. The spectral range was 10,000-4,000cm-1 and each spectrum was measured at 2 cm-1 intervals. For the purpose of geographic origin classification, this study used FT-NIR spectroscopy combined with Partial Least Squares Discriminant Analysis (PLS-DA), and Principal Component Analysis-Discriminant Analysis (PCA-DA). The ability to determine the origin of tea samples in the prediction set of PLS-DA model is 100%. Using the same IR spectral database combined with the partial least squares (PLS), three methylxanthines in tea samples are also quickly quantified. The PLS model based on the spectra of 24 tea samples in which the contents of 3 analytes were determined by high performance liquid chromatography- HPLC) were applied for simultaneous determination of caffeine, theobromine and theophylline in samples. The determination of methylxanthines in 7 tea samples in test set gave the good accuracy of the PLS model. The correlation coefficients (R2) in the prediction set were of 0.9582, 0.8894 and 0.9303 for theobromine, theophylline, and caffeine, respectively. This work demonstrated that infrared reflectance spectrophotometry combined with chemometrics could be applied to rapidly classify the geographic origin and simultaneous determination of main contents in green tea.
653 |aCaffeine
653 |aInfrared reflectance spectrophotometry
653 |aMultivariable
653 |aRegression
653 |aTheobromine
653 |aTheophylline
653|aCây chè
700 |a Bui, Duc Tho
700 |aNguyen, Van Ri
700 |aTran, Thi Hue
700|aTa, Thi Thao
773 |tJournal of Science and Technology - NTTU|d2019|gp. 33-40|x2615-9015|i06
890|c1|a0|b0|d6
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