詳細信息綠茶(茶樹)葉中的兒茶素和黃嘌呤
SRM 3254-Green tea (Camellia sinensis) leaves - Catechins and xanthines
| 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
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