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首页 > 供应产品 > 绿茶(茶树)叶中的儿茶素和黄嘌呤(货号:SRM 3254)
绿茶(茶树)叶中的儿茶素和黄嘌呤(货号:SRM 3254)
浏览: 959
品牌: NIST
产品规格: 5包 x 3g
单价: 面议
最小起订量:
供货总量:
发货期限: 自买家付款之日起 3 天内发货
有效期至: 长期有效
最后更新: 2021-06-03 22:15
 
详细信息
 详细信息绿茶(茶树)叶中的儿茶素和黄嘌呤
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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