食品中限量元素分析样品的预处理技术进展

本文综述了近年来食品中限量元素分析的样品前处理技术,重点对密封罐消解(包括普通电烘箱密封罐消解及微波消解技术)在食品农药限量元素分析中的应用进行了评述;同时对常规样品预处理技术(高温灰化、湿法消化)、低温灰化技术、酸提取技术及分离富集技术应用进行了总结,对食品中限量元素分析预技术发展方向进行了讨论。

Affinity Purification of Insulin by Peptide-Ligand Affinity Chromatography

The affinity heptapeptide(HWWWPAS)for insulin,selected from phage display library,was coupled to EAH Sepharose 4B gel and packed to a 1-mL column.The column was used for the affinity purification of insulin from protein mixture and commercial insulin preparation.It was observed that the minor impurity in the commercial insulin was removed by the affinity chromatography.Nearly 40 mg of insulin could be purified with the 1-mL affinity column.The results revealed the high specificity and capacity of the affinity column for insulin purification.Moreover,based on the analysis of the amino acids in the peptide sequence,shorter peptides were designed and synthesized for insulin chromatography.As a result,HWWPS was found to be a good alternative to HWWWPAS,while the other two peptides with three or four amino acids showed weak affinity for insulin.The results indicated that the peptide sequence of HWWWPAS was quite conservative for specific binding of insulin.

高纯氧化铝制备方法和生产现状研究

氧化铝生产设备经常与高腐蚀性物质接触,并且全年暴露于高温和高压下。腐蚀程度非常严重。因此,为了降低生产设备的腐蚀指数,开展了氧化铝厂生产设备的腐蚀防护技术。探索。简要介绍了酸铝的生产工艺,分析了铁杂质影响铝盐结晶的机理。总结了国内外沉淀,萃取,树脂法等酸性溶液铝铁分离技术的研究进展,比较了它们的优缺点,以及除铁技术的未来发展前景,提供了一定的参考和认识。氧化铝除酸工艺中除铁技术突破的灵感来源。