Individual NIR calibrations were developed by combiningall 95 tea leaf translation - Individual NIR calibrations were developed by combiningall 95 tea leaf Indonesian how to say

Individual NIR calibrations were de

Individual NIR calibrations were developed by combining
all 95 tea leaf samples in one common set. Table
1 shows the mean concentrations, standard deviations,
and ranges of the different quality parameters analyzed
by the reference methods (HPLC, Folin-Ciocalteu). It
can be seen from Table 1 that the variation data are
good for most of the criteria under investigation. Furthermore,
it summarizes also the statistic parameters
obtained in the development of the calibration equations.
A high correlation between NIRS-predicted and
HPLC values for the major catechins [(-)-epicatechin
(EC), ECG, and EGCG] and for caffeine is obtained. The
reason the NIRS determination of (-)-epigallocatechin
(EGC) presents somewhat less prediction quality is
probably referred to the applied HPLC reference procedure,
which has been performed according to the
described ISO method. In this method EGC is not
detected at the absorption maximum. Taking into
account the SD/SECV ratio of the investigated quality
parameters, almost all of the developed models can be
used for analytical purposes. The low SD/SECV ratio
for total phenolics (1.74) is attributed to the limited
selectivity of the applied photometric reference method.
Because cross-validation is a very useful tool to
estimate the predictive ability of the calibration equations,
no attempts have been made to perform additional
external validation.
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Individual NIR calibrations were developed by combiningall 95 tea leaf samples in one common set. Table1 shows the mean concentrations, standard deviations,and ranges of the different quality parameters analyzedby the reference methods (HPLC, Folin-Ciocalteu). Itcan be seen from Table 1 that the variation data aregood for most of the criteria under investigation. Furthermore,it summarizes also the statistic parametersobtained in the development of the calibration equations.A high correlation between NIRS-predicted andHPLC values for the major catechins [(-)-epicatechin(EC), ECG, and EGCG] and for caffeine is obtained. Thereason the NIRS determination of (-)-epigallocatechin(EGC) presents somewhat less prediction quality isprobably referred to the applied HPLC reference procedure,which has been performed according to thedescribed ISO method. In this method EGC is notdetected at the absorption maximum. Taking intoaccount the SD/SECV ratio of the investigated qualityparameters, almost all of the developed models can beused for analytical purposes. The low SD/SECV ratiofor total phenolics (1.74) is attributed to the limitedselectivity of the applied photometric reference method.Because cross-validation is a very useful tool toestimate the predictive ability of the calibration equations,no attempts have been made to perform additionalexternal validation.
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Results (Indonesian) 2:[Copy]
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Kalibrasi NIR individu dikembangkan dengan menggabungkan
semua sampel daun teh 95 dalam satu set umum. Tabel
1 menunjukkan konsentrasi rata-rata, standar deviasi,
dan rentang parameter kualitas yang berbeda dianalisis
oleh metode referensi (HPLC, Folin Ciocalteu-). Hal
ini dapat dilihat dari Tabel 1 bahwa data variasi yang
baik untuk sebagian besar kriteria diselidiki. Selanjutnya,
merangkum juga parameter statistik
yang diperoleh dalam pengembangan persamaan kalibrasi.
Sebuah korelasi yang tinggi antara NIRS-prediksi dan
nilai HPLC untuk katekin utama [(-) - epicatechin
(EC), EKG, dan EGCG] dan untuk kafein diperoleh. The
Alasan penentuan NIRS dari (-) - epigallocatechin
(EGC) menyajikan kualitas prediksi agak kurang adalah
mungkin disebut prosedur referensi HPLC yang diterapkan,
yang telah dilakukan sesuai dengan
metode ISO dijelaskan. Dalam metode ini EGC tidak
terdeteksi pada maksimum penyerapan. Mengingat
akun rasio SD / SECV dari kualitas diselidiki
parameter, hampir semua model yang dikembangkan dapat
digunakan untuk tujuan analisis. Rasio SD / SECV rendah
total fenolat (1,74) dikaitkan dengan keterbatasan
selektivitas metode referensi fotometri diterapkan.
Karena cross-validasi adalah alat yang sangat berguna untuk
memperkirakan kemampuan prediksi dari persamaan kalibrasi,
tidak ada upaya telah dilakukan untuk melakukan tambahan
validasi eksternal.
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