计算溶液所需的质量、体积或浓度。
马来酰亚胺 PEG N-羟基琥珀酰亚胺是一种异双功能聚乙二醇衍生物,可同时与巯基和氨基发生反应。NHS 酯可与去质子化的伯胺反应,因此该反应需要在中性至弱碱性 pH 条件下进行。马来酰亚胺基团可与天然存在或经突变引入的半胱氨酸残基上的游离巯基(–SH)发生反应。在室温、pH 6.5~7.5条件下,马来酰亚胺基团与巯基反应,形成稳定的硫醚键。
Maleimide PEG NHS is a heterobifunctional PEG derivative that can react with both thiol and amine groups. NHS esters react with deprotonated primary amines, therefore, the reaction requires neutral to basic pH values to proceed. The maleimide group reacts with available –SH groups from naturally occurring or mutagenically derived cysteine residues. Maleimide groups react with sulfhydryl groups at pH 6.5~7.5 at room temperature to form stable thioether bonds.