The bleached natural shellac product with low chlorine content was prepared by means of catalytic hydrogenation of the bleached shellac in the presence of Ni-Fe binary-metal catalyst and hydrogen.
制备和表征了在食品及制药业中广泛使用的天然低氯漂白紫胶。
The content of reducing sugar, K, Fe, Mn, Cu and Zn were higher, but that of nicotine, chloride ion and Mg were low in tobacco leaf.
烟叶还原糖、钾、铁、锰、铜和锌含量较高，烟叶尼古丁、氯离子和镁含量偏低。
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