Identification and characterization of Se-methyl selenomethionine in Brassica juncea roots.

Identification and characterization of Se-methyl selenomethionine in Brassica juncea roots.
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芥菜根中硒甲基硒代蛋氨酸的鉴定和表征。

DOI:
10.1016/j.chroma.2003.11.039
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发表时间:
2004
期刊:
Journal of chromatography. A
影响因子:
--
通讯作者:
Caruso,JosephA
Caruso,JosephA
中科院分区:
--
文献类型:
--
作者:
Grant,TyreD;Montes-Bayón,María;LeDuc,Danika;Fricke,MichaelW;Terry,Norman;Caruso,JosephA

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本工作表明,硒甲基硒蛋氨酸(SeMMet)作为一个重要的硒物种在芥菜根生长时,在硒蛋氨酸(SeMet)的存在下作为硒源的鉴定和表征。采用两种不同的液相色谱机制通过液相色谱分离SeMMet:使用七氟丁酸作为反离子的反相离子配对和使用吡啶甲酸盐梯度(pH 3)的阳离子交换。电感耦合等离子体质谱法用于硒的检测。SeMMet的特征在于通过电喷雾四极杆飞行时间MS在合成的标准品和根提取物中使用碰撞诱导解离的所选离子。初步证据表明,芥菜也可能产生丙酸二甲基硒,尽管程度要小得多。
The present work shows the identification and characterization of Se-methyl selenomethionine (SeMMet) as an important Se species in Brassica juncea roots when grown in the presence of Se-methionine (SeMet) as the Se source. SeMMet was isolated by liquid chromatography employing two different liquid chromatographic mechanisms: reversed-phase ion-pairing using heptafluorobutyric acid as counter ion and cation exchange using a pyridinium formate gradient (pH 3). Inductively coupled plasma mass spectrometry was used for the detection of Se. SeMMet was characterized by electrospray quadrupole time-of-flight MS in both a synthesized standard and in the roots extract using collision-induced dissociation of the selected ion. Preliminary evidence suggests that Brassica juncea may also produce dimethylselenonium propionate, although to a much lesser extent.
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