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1. 天水师范学院生命科学与化学学院,甘肃 天水,74100
2. 定西师范高等专科学校,甘肃 定西,743000
收稿日期:2013-07-26,
修回日期:2013-09-25,
纸质出版日期:2013-12-10
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李小芳, 冯小强, 杨声, 王霞. 丁二酰化壳寡糖稀土配合物与鲱鱼精DNA相互作用的电化学及光谱学研究[J]. 发光学报, 2013,34(12): 1662-1666
LI Xiao-fang, FENG Xiao-qiang, YANG Sheng, WANG Xia. Interaction of Succinic-oligochitosan Rare Earth Complexes with Herring Sperm DNA by Electrochemical and Spectral Methods[J]. Chinese Journal of Luminescence, 2013,34(12): 1662-1666
李小芳, 冯小强, 杨声, 王霞. 丁二酰化壳寡糖稀土配合物与鲱鱼精DNA相互作用的电化学及光谱学研究[J]. 发光学报, 2013,34(12): 1662-1666 DOI: 10.3788/fgxb20133412.1662.
LI Xiao-fang, FENG Xiao-qiang, YANG Sheng, WANG Xia. Interaction of Succinic-oligochitosan Rare Earth Complexes with Herring Sperm DNA by Electrochemical and Spectral Methods[J]. Chinese Journal of Luminescence, 2013,34(12): 1662-1666 DOI: 10.3788/fgxb20133412.1662.
采用紫外光谱和循环伏安法,研究了丁二酰化壳寡糖稀土配合物(BCS-La、BCS-Nd)与鲱鱼精DNA之间的作用方式。BCS-La、BCS-Nd的存在导致Fe(CN)
6
3-/4-
探针分子峰电流下降,式量电位正移,表明BCS-La、BCS-Nd和探针分子与DNA之间存在竞争性作用;BCS-La和BCS-Nd分子都是通过插入方式与DNA相互作用。在一定的扫描速率范围内(0.01~0.2 V/s),在BCS-La或BCS-Nd参与的条件下,Fe(CN)
6
3-/4-
在Au/DNA电极上的反应受吸附控制。BCS-La和BCS-Nd分别使得鲱鱼精DNA的特征峰产生明显的减色效应,最大吸收峰峰位红移,进一步表明BCS-La和BCS-Nd分别以插入方式与鲱鱼精DNA发生相互作用,导 致DNA分子的构象变化。BCS-La与DNA的结合比为:
n
(BCS-La):
n
(DNA)=2:1;
n
(BCS-Nd):
n
(DNA)=6:1。
The interaction between succinic-oligochitosan-rare earth complexes (BCS-La and BCS-Nd) and herring sperm DNA was investigated by cyclic voltammetry and UV-Vis spectra. The results indicated as follows. Firstly
the peak current of probe molecule Fe(CN)
6
3-/4-
at Au/DNA electrodes obviously decreased and the peak potential shifted positively because of the existences of complexes. All above these showed that there was a competitive effect between complexes and probe molecule with herring sperm DNA
which revealed that a binding mode intercalation was interacted between complexes and herring sperm DNA. The reaction of Fe(CN)
6
3-/4-
at Au/DNA electrodes was controlled by adsorption mechanism in the range of scan rate from 0.01 V/s to 0.2 V/s. Secondly
the absorption intensity of herring sperm DNA decreased with the adding of complexes
and the maximum absorption peak had a red shift
which further illustrated that a binding mode intercalation was interacted between complexes and herring sperm DNA
thus led to the change of DNA conformation. The combining ratio of
n
(BCS-La) and
n
(BCS-Nd) with DNA was 2:1 and 6:1
respectively.
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