DusQ 21是一种在FRET应用中用作受体的暗淬灭剂，其最大吸收波长为656 nm，由于缺乏二次荧光，可用于多重检测。它是与在该范围的红色和近红外部分发射的荧光染料配对的首选猝灭剂。DusQ 21 NHS酯衍生物用于标记含胺分子的伯胺。它可用于淬灭许多荧光团，包括Cyanie5、Cyanie5.5、AF 647。 DusQ 21 is a dark quencher used as an acceptor in FRET applications, it has absorption maximum 656 nm, and can be used in multiplex assays due to the lack of secondary fluorescence. It is a quencher of choice for pairing with fluorescent dyes that emit in the red and near-infrared part of the range. DusQ 21 NHS ester derivative is used for labeling with the primary amines of amine-containing molecules. It can be used for quenching of many fluorophores, including Cyanine5, Cyanine5.5, AF 647.