Determination of substances characteristic of green and black tea — Part 2: Content of catechins in green tea — Method using high-performance liquid chromatography
NORMA vydána dne 16.3.2005
Označení normy: ISO 14502-2:2005
Datum vydání normy: 16.3.2005
Počet stran: 23
Přibližná hmotnost: 69 g (0.15 liber)
Země: Mezinárodní technická norma
Kategorie: Technické normy ISO
Description / Abstract: ISO 14502-2:2005 specifies a high-performance liquid chromatographic (HPLC) method for the determination of the total catechin content of tea from the summation of the individual catechins. It is applicable to both leaf and instant green tea, and with precision limitations to black tea. Gallic acid and caffeine can also be determined by this method, as can theogallin and theaflavins.