3.6. Quantitative determination of ten components in Ziyang green teaI terjemahan - 3.6. Quantitative determination of ten components in Ziyang green teaI Bahasa Indonesia Bagaimana mengatakan

3.6. Quantitative determination of

3.6. Quantitative determination of ten components in Ziyang green tea

In this study, the proposed HPLC method was successfully applied to the simultaneous determination of the ten components in Ziyang green tea samples.
The identity of the marker compound peaks in the chromatogram was confirmed by their retention times and their UV profiles.
Quantification was based on the external standard method using calibration curves fitted by linear regression analysis.
The analysis was performed in triplicates. The contents of the ten marker compounds in ten batches of Ziyang green tea from different areas of Ziyang are summarised in Table 4.
The results showed that the catechins (including EGCG, EGC,ECG, EC, GCG, GC, and C) accounted for 77.66% of the contents of ten compounds, which were the dominant components in Ziyang green tea samples.
Furthermore, EGCG was the major catechin monomer found in the tea samples in the range of 48.68– 93.88 mg/g, followed by EGC (average content was 19.04 mg/g), ECG (12.80 mg/g), EC (6.66 mg/g), GC (2.86 mg/g), GCG (2.11 mg/g), and C (1.44 mg/g). The identified epicatechins (EGCG, EGC, ECG
and EC) are in cis structure. The non-epicatechins GCG, GC and Care the corresponding epimers of EGCG, EGC and EC, respectively (Fig. 1A). The accumulation of EGCG in green tea is possibly due to inactivation of the polyphenol oxidase by drying and steaming the fresh leaves until non oxidation process occurs (Rahim, Nofrizal, & Saad, 2014).
Additionally, the phenolic acid compounds, including GA (average content was 1.08 mg/g) and CA (0.72 mg/g), accounted for 1.21% of the contents of ten markers.
The level of caffeine in Ziyang green tea samples was in the range of 26.71–38.06 mg/g.
The largest variation was found in the contents of CA and GCG in the ten batches of samples with having an RSD of 72.22% and 78.12%, respectively.
This indicated that the contents of CA and GCG in the ten batches of Ziyang green tea samples from different tea plantations were evidently different.
The other eight contents in the ten batches of Ziyang green tea samples were consistent with all having an RSD less than 50%.
These data suggested that the quality of the commercial Ziyang green tea could be successfully monitored by determining these contents in the samples.

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3.6. Quantitative determination of ten components in Ziyang green teaIn this study, the proposed HPLC method was successfully applied to the simultaneous determination of the ten components in Ziyang green tea samples. The identity of the marker compound peaks in the chromatogram was confirmed by their retention times and their UV profiles. Quantification was based on the external standard method using calibration curves fitted by linear regression analysis. The analysis was performed in triplicates. The contents of the ten marker compounds in ten batches of Ziyang green tea from different areas of Ziyang are summarised in Table 4.The results showed that the catechins (including EGCG, EGC,ECG, EC, GCG, GC, and C) accounted for 77.66% of the contents of ten compounds, which were the dominant components in Ziyang green tea samples. Furthermore, EGCG was the major catechin monomer found in the tea samples in the range of 48.68– 93.88 mg/g, followed by EGC (average content was 19.04 mg/g), ECG (12.80 mg/g), EC (6.66 mg/g), GC (2.86 mg/g), GCG (2.11 mg/g), and C (1.44 mg/g). The identified epicatechins (EGCG, EGC, ECGand EC) are in cis structure. The non-epicatechins GCG, GC and Care the corresponding epimers of EGCG, EGC and EC, respectively (Fig. 1A). The accumulation of EGCG in green tea is possibly due to inactivation of the polyphenol oxidase by drying and steaming the fresh leaves until non oxidation process occurs (Rahim, Nofrizal, & Saad, 2014). Additionally, the phenolic acid compounds, including GA (average content was 1.08 mg/g) and CA (0.72 mg/g), accounted for 1.21% of the contents of ten markers. The level of caffeine in Ziyang green tea samples was in the range of 26.71–38.06 mg/g.The largest variation was found in the contents of CA and GCG in the ten batches of samples with having an RSD of 72.22% and 78.12%, respectively. This indicated that the contents of CA and GCG in the ten batches of Ziyang green tea samples from different tea plantations were evidently different. The other eight contents in the ten batches of Ziyang green tea samples were consistent with all having an RSD less than 50%. These data suggested that the quality of the commercial Ziyang green tea could be successfully monitored by determining these contents in the samples.
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3.6. Penentuan kuantitatif dari sepuluh komponen dalam teh hijau Ziyang Dalam penelitian ini, metode HPLC yang diusulkan itu berhasil diterapkan untuk penentuan simultan sepuluh komponen di Ziyang sampel teh hijau. Identitas puncak senyawa penanda dalam kromatogram adalah fi con rmed oleh waktu retensi mereka dan mereka UV pro fi les. Quanti fi kasi didasarkan pada metode standar eksternal menggunakan kurva kalibrasi Fi tted dengan analisis regresi linier. Analisis dilakukan di tiga ulangan. Isi dari sepuluh senyawa penanda dalam sepuluh batch teh hijau Ziyang dari berbagai wilayah Ziyang dirangkum dalam Tabel 4. Hasil penelitian menunjukkan bahwa katekin (termasuk EGCG, EGC, EKG, EC, GCG, GC, dan C) menyumbang 77,66% dari isi sepuluh senyawa, yang merupakan komponen yang dominan di Ziyang sampel teh hijau. Selanjutnya, EGCG merupakan monomer utama catechin yang ditemukan dalam sampel teh di berbagai 48.68- 93,88 mg / g, diikuti oleh EGC (konten-rata adalah 19,04 mg / g), ECG (12,80 mg / g), EC (6,66 mg / g), GC (2,86 mg / g), GCG (2.11 mg / g), dan C (1,44 mg / g). The diidentifikasi epicatechins (EGCG, EGC, EKG dan EC) dalam struktur cis. Non-epicatechins GCG, GC dan Perawatan yang epimer sesuai EGCG, EGC dan EC, masing-masing (Gambar. 1A). Akumulasi EGCG dalam teh hijau mungkin karena inaktivasi dari polifenol oksidase dengan pengeringan dan mengukus daun segar sampai proses non oksidasi terjadi (Rahim, Nofrizal, & Saad, 2014). Selain itu, senyawa asam fenolat, termasuk GA (rata konten adalah 1,08 mg / g) dan CA (0,72 mg / g), menyumbang 1,21% dari isi sepuluh spidol. Tingkat kafein dalam Ziyang sampel teh hijau adalah di kisaran 26,71-38,06 mg / g. terbesar Variasi ditemukan dalam isi CA dan GCG dalam sepuluh batch sampel dengan memiliki RSD dari 72,22% dan 78,12%, masing-masing. Hal ini menunjukkan bahwa isi CA dan GCG dalam sepuluh batch Ziyang sampel teh hijau dari teh yang berbeda perkebunan yang jelas berbeda. Delapan isi lainnya dalam sepuluh batch Ziyang sampel teh hijau yang konsisten dengan semua memiliki RSD kurang dari 50%. Data ini menunjukkan bahwa kualitas teh hijau Ziyang komersial dapat berhasil dipantau dengan menentukan isi ini dalam sampel.















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