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Determination of catechins and caffeine in tea polyphenols / 中成药
Chinese Traditional Patent Medicine ; (12)1992.
Artigo em Chinês | WPRIM | ID: wpr-682213
ABSTRACT

Objective:

To develop a HPLC method for simultaneous determination of catechins (EGC、DC、EGCG、EC、GCG、ECG) and caffeine in tea polyphenols and to quantify seven ingredients in twenty nine batches of tea polyphenols samples from thirteen producers.

Methods:

The study was achieved using a C 18 column with a methanol water 0.1% formic acid gradient elution system.

Results:

The peak resolutions of seven ingredients in mixed standards were all above 2; The resolutions in samples were all above 1.5 except EGCG; The average recoveries were 98.56%~100.14%.

Conclusion:

This method is accurate, stable, reproducible and suitable for quality control of tea polyphenols; the variations of contents are obvious among tea polyphenols samples from different even the same producers.

Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Idioma: Chinês Revista: Chinese Traditional Patent Medicine Ano de publicação: 1992 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Idioma: Chinês Revista: Chinese Traditional Patent Medicine Ano de publicação: 1992 Tipo de documento: Artigo