双硫键在化学上是一条从结合硫醇而衍生的单共价键。它又称为二硫键或双硫桥，差不多只用于生物化学的范畴。其正式名称应为过硫化物，但却甚少使用。与过氧化物（R-O-O-R）相似，它的整体连结是R-S-S-R。三个硫原子按序列连结有时被称为三硫键，但其实只是两个双硫键。
用极谱电流法测定BSA还原波的电子数，证实该波为BS A中的两个双硫键还原所致。
It was ascertained that this wave results from reduction of two disulfide bonds of BSA through determining the electron number by polarographic current method.
相反的，超过二十一种不同的血浆蛋白次单位可以组成血浆中双硫键键结的蛋白质同源体。
On the contrary, more than 21 different plasma protein subunits comprised the disulfide-mediated protein conjugates in plasma.
这两种新组分都含有双硫键，其中34 ~ 37 KD新组分可能是球蛋白的直接降解产物。
The two new fractions contained double sulfur bands, of which 34-37kd was considered to be a product of proteolysis of cucurbitin.
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