脱氧核糖核酸与双苯甲亚胺相互作用的荧光特性研究

采用荧光光谱法对脱氧核糖核酸（ＤＮＡ）与双苯甲亚胺（Ｈｏｃｅｈｓｔ ３３２５８）相互作用的方式及其作用机理进行了研究,证实了Ｈｏｅｃｈｓｔ ３３２５８与ＤＮＡ的相互作用除嵌入作用时,还存在持异性的静电作用;Ｈｏｅｃｈｓｔ３３２５８与ＤＮＡ主要作用在Ａ－Ｔ匹配,同时,在磷酸根的存在下可以减弱Ｈｏｅｃｈｓｔ３３２５８与ＤＮＡ的非特异性作用。另外,根据荧光峰增强与Ｈｏｅｃｈｓｔ３３２５８浓度的线性关系,     

Zinc-Binding Peptides from Protein of Cicer arietinum

Chemistry of Natural Compounds - A zinc-binding peptide was obtained from the albumin fraction of chickpea Cicer arietinum by separating Zn2+ using immobilizing metal-affinity chromatography...     

Cu@PtCu催化薄膜的构筑及氧还原催化性能研究

采用喷涂或转印方法制备的质子交换膜燃料电池催化层存在活性不均匀或活性位点易失效的问题。本研究用静电纺丝法制备高导电性的柔性碳纳米纤维薄膜，然后将析氢电位较高的Cu以脉冲电沉积的方式均匀沉积到纤维膜上，制备出Cu纳米晶/碳纳米纤维膜，最后通过原位置换还原，合成Cu@PtCu/碳纳米纤维(Cu@PtCu/CNF)催化薄膜。Cu@PtCu/CNF催化薄膜解决了催化层活性不均的问题，且可以直接作为催化层使用。采用SEM、XRD、XPS等对其形貌、结构进行了表征。电化学测试结果表明，在pH=4、氯铂酸浓度为0.25 mg·mL^-1时获得的Cu@PtCu/CNF催化薄膜，其面积比活性为49 m²·g^-1。在5 000个循环的稳定性测试后，电化学活性比表面积保持74%,半波电位下降了9 mV,均优于商业Pt/C催化剂。     

Chemical Properties and Antioxidant Activity of Polysaccharides from Orchis mascula

Chemistry of Natural Compounds - The polysaccharide composition of dried bulbs of Orchis mascula (L.) L. is reported. The obtained polysaccharides were studied as sulfate derivatives, were called...     

Composition of the Petroleum Ether Extract of Piper longum and its Cytotoxic Activity

Chemistry of Natural Compounds -     

基于逻辑思维主线的分析化学教学设计与实践

This paper expounds the importance of logical thinking in the teaching of analytical chemistry and shows the internal logical relationship of the knowledge of analytical chemistry. Based on the logical relationship, the teaching design of the main content of analytical chemistry is carried out. In teaching practice, twice as much can be accomplished with half the effort with deep thinking and effective use of the progressive logical relationship inside and between chapters, and focusing on combing the main line of knowledge points. Then, the teaching difficulty can be effectively reduced and the students' learning interest and the teaching effect can be improved. At the same time, the rigorous logical thinking ability and scientific research innovation consciousness of the students can be trained.     

Photoluminescence study of tetra-dendron dendrimers derived from ethylenediamine cores and di-dendron dendrimers derived from mono-Boc-protected ethylenediamine cores

Strong UV absorbance spectra and fluorescence spectra from tetra-dendron dendrimers derived from ethylenediamine cores with different terminal groups (-NH₂, -COOCH₃) or di-dendron dendrimers derived from mono-Boc-protected ethylenediamine cores were studied under different conditions by varying experimental parameters such as pH value and concentration. The result shows a rapid increase of fluorescence intensity at low pH. It was reasonable that the formation of a fluorescence-emitting moiety had a close relationship to protonated tertiary amine groups in tetra-dendron dendrimers derived from ethylenediamine cores or di-dendron dendrimers derived from mono-Boc-protected ethylenediamine cores. Furthermore, it was confirmed that the concentration of two dendrimers plays an important role in fluorescence intensity. The increase in fluorescence intensity was linear with respect to concentration at low concentration regions but the intensity increases slowly at high concentration regions.