壳寡糖-金属配合物对太平洋牡蛎体内中Cd残留脱除效果的研究
首发时间:2011-02-21
摘要:贝类重金属污染,尤其是镉(Cd)污染已经成为影响海洋贝类食品安全的一个重要问题。有研究表明壳寡糖(chitosan oligosaccharide, COS)-金属配合物可显著降低贝类体内的重金属含量,但未对COS分子量及脱乙酰度对其金属配合物的重金属脱除效果的影响进行研究。本文以太平洋牡蛎为实验对象,研究了COS分子量及脱乙酰度对COS-金属配合物脱Cd效果的影响,并对其应用条件进行了优化。结果表明,在COS-Ca、COS-Mg、COS-Zn和COS-Ree四种配合物中,COS-Mg的脱Cd效果最好;进一步的研究表明,COS的分子量和脱乙酰度对COS-Mg的脱Cd效果均有显著影响,其中当COS分子量为2000、脱乙酰度为90%时COS-Mg对太平洋牡蛎的Cd脱除效果最佳,可达到28.20%;最后对该COS-Mg配合物的应用条件进行了优化,发现当配合物浓度为100mg/L海水、脱除时间为48小时时,Cd脱除率最高,可达34.68%。本研究表明,COS-Mg配合物可有效降低牡蛎体内的Cd残留,是一种非常有潜力的贝类重金属残留脱除剂。
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Effect of chitosan oligosaccharide-metal complex on cadmiun removal from oyster Crassostrea gigas
Abstract:Pollution of marine molluscs by heavy metals, especially cadmium (Cd), has turned to be a ctritical issue that threatens the safety of molluscs-derived foods. Lastest researches indicated that chitosan oligosaccharide (COS)-metal complexes could significantly reduced heavy metal contents in molluscs; however, the effects of COS properties on the Cd removal effects by its metal complexes remain unclear. In this paper, the effects of COS properties, including molecular weight and degree of deacetylation, on Cd removal by COS-metal complexes were studied by using oyster Crassostrea gigas as the model and the application conditions were optimized. The results showed that the COS-Mg complex had the highest Cd removal rate among COS-Ca, COS-Mg, COS-Zn, and COS-Ree complexes. The molecular weight and degree of deacetylation of COS significantly affected the Cd removal of the COS-Mg complex and the highest removal was obtained in COS molecular weight 2000 and degree of deacetylation 90%, reaching 28%. Optimiztion experiments showed that the optimum Cd removal conditions were COS-Mg concentration 100 mg/L and exposure for 48 h. Under these conditions, the Cd removal rate reaches 34.68%. It is concluded that the COS-Mg complex can effectively reduced Cd content in oyster and is a potent Cd removal agent for molluscs.
Keywords: chitosan oligosaccharide complex oyster cadmium residue removal
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壳寡糖-金属配合物对太平洋牡蛎体内中Cd残留脱除效果的研究
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