Disclosed is a composition that synergistically prevents proteolysis or modification of peptides in sampled biological fluids using sulfonyl fluoride family protease inhibitors at high concentrations combined with at least one additional protease inhibitor of a different type, preferably a broad spectrum protease inhibitor, and a chelator. A preferred embodiment uses AEBSF at 10mM, Benzamidine at 20mM and EDTA as the chelator. The disclosed composition may be combined with other protease inhibitors to further modulate its specificity, for instance to additionally target acidic proteases. Additional protease inhibitors, reducing agents, stabilizers and buffering agents may be combined with the disclosed compositions in devices for sampling or testing biological fluids for levels of peptides of interest, or methods therefore. The disclosed devices, compositions and methods are of particular use in sampling and testing for the level of natriuretic peptides.
本发明公开了一种组合物,使用高浓度的磺酰
氟族蛋白酶抑制剂与至少一种不同类型的蛋白酶抑制剂(最好是广谱蛋白酶抑制剂)和一种
螯合剂相结合,可协同防止采样
生物液体中肽的蛋白
水解或修饰。一个优选的实施方案使用 10mM 的 AEBSF、20mM 的
联苯胺和
EDTA 作为
螯合剂。所公开的组合物可与其他蛋白酶抑制剂结合使用,以进一步调节其特异性,例如额外针对
酸性蛋白酶。其他蛋白酶抑制剂、还原剂、稳定剂和缓冲剂可与所公开的组合物结合,用于
生物液体中相关肽
水平的采样或测试装置,或用于相关方法。所公开的装置、组合物和方法尤其适用于
钠尿肽
水平的取样和检测。