桑蚕丝腺体和丝纤维中金属离子的含量

Metal Element Contents in Silk Gland and Silk Fiber of Bombyx mori Silkworm

用不同的测试方法,即质子诱导X射线发射(PIXE)、电感耦合等离子体质谱(ICP-MS)和原子吸收光谱(AAS)对桑蚕丝腺体和丝纤维中金属元素的含量进行了详细的表征.结果表明,在桑蚕丝腺体和丝纤维中含有钠、镁、钾、钙、铜、锌、铁、锰八种金属元素,同时还可能含有微量的铷和锶.这些金属元素在丝腺体和各种丝纤维(蚕茧丝、强拉丝和脱胶丝)中的含量都有所变化,而这些变化可能与之在成丝过程(丝蛋白的构象转变过程)中所起的作用有关.

The contents of metal elements in silk gland and silk fiber of B. mori silkworm have been detailedly analyzed by proton induced X-ray emission （PIXE）, inductively coupled plasma mass spectroscopy （ICP-MS） and atomic adsorption spectroscopy （AAS）. The results showed that Na, Mg, K, Ca, Cu, Zn, Fe and Mn were found in both silk gland and silk fiber, while Rb and Sr were also possibly contained. The contents of these elements varied from silk gland to different kinds of silk fibers （i.e. cocoon silk, forced-drawn silk and degummed silk）, and the changes of element content might correspond to the effect of these metal dements on the spinning process （conformation transition of silk fibroin） of B. mori silkworm.