详细信息

Green tea (Camellia sinensis) leaves - Catechins and xanthines
This Standard Reference Material (SRM®) is intended primarily for use in validating analytical methods for the
determination of catechins and xanthines in the leaves of Camellia sinensis (green tea) and similar matrices.
SRM3254 can also be used for quality assurance when assigning values to in-house control materials. A unit of
SRM3254 consists of five packets, each containing approximately 3 g of leaf powder.

Certified Mass Fraction Values for Selected Catechins and Xanthines in SRM3254
                                                               Mass Fraction                                                                      Mass Fraction
                                                (mg/g, dry-mass basis)                                                        (mg/g, dry-mass basis)
(–)-Epicatechin ............................................ 9.0 ± 1.6       (–)-Gallocatechin gallate ......................... 0.99 ± 0.21
(–)-Epicatechin gallate .............................. 12.7 ± 1.2        Caffeine ..................................................... 23.5 ± 1.8
(–)-Epigallocatechin .................................. 25.2 ± 4.5        Theobromine ....................................... 0.463 ± 0.052
(–)-Epigallocatechin gallate ...................... 52.0 ± 2.2
Indicative values for (+)-Catechin, (–)-Gallocatechin, Gallic acid and L-theanine