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Tea and instant tea in solid form — Determination of caffeine content — Method using high-performance liquid chromatography
90.93 Standard confirmed
Tea — Classification of grades by particle size analysis
90.20 Standard under periodical review
Determination of substances characteristic of green and black tea — Part 1: Content of total polyphenols in tea — Colorimetric method using Folin-Ciocalteu reagent
90.93 Standard confirmed
Determination of substances characteristic of green and black tea — Part 1: Content of total polyphenols in tea — Colorimetric method using Folin-Ciocalteu reagent — Technical Corrigendum 1
60.60 Standard published
Determination of substances characteristic of green and black tea — Part 2: Content of catechins in green tea — Method using high-performance liquid chromatography
90.93 Standard confirmed
Determination of substances characteristic of green and black tea — Part 2: Content of catechins in green tea — Method using high-performance liquid chromatography — Technical Corrigendum 1
60.60 Standard published
Tea — Preparation of ground sample of known dry matter content
90.93 Standard confirmed
Tea — Determination of water-soluble ash and water-insoluble ash
90.93 Standard confirmed
Tea — Determination of theaflavins in black tea — Method using high performance liquid chromatography
60.60 Standard published
Determination of theanine in tea and instant tea in solid form using high-performance liquid chromatography
90.93 Standard confirmed