Studies of the Mg-Al and Cation-Incorporated Hydrotalcites

研究了掺杂阳离子水滑石的制备及阳离子对水滑石性质的影响.分别制备了掺杂Zn2+、Ni2+、Fe3+型的水滑石,考察了掺杂阳离子对水滑石晶相结构、层间距、层间阴离子含量、水滑石表面形态、水滑石碱性的影响,结果表明,由于阳离子的引入,导致水滑石层间距减小及层间阴离子结合量降低,且使水滑石培烧产物电负性提高,并最终降低其碱性.以上述水滑石培烧产物作为固体碱催化剂促进苯甲醛和丙醛缩合,合成α-甲基肉桂醛,关联了水滑石培烧产物碱性与反应活性的关系.Mg-Al and cation-incorporated(containing Zn2+?Ni2+?Fe3+) hydrotalcites were synthesized and characterized. A detailed comparative analysis of structure and composition was made. Different cations influenced strongly textural parameters of hydrotalcites and the basicity of the obtained Mg-Al oxides after calcinations. With the cation incorporation, the distance of the brucite and the mount of CO2-3 as the compensating anion changed. Meanwhile the CO2-TPD was used to determine the basicity of the samples. The results showed that the basicity of the calcined hydrotalcites reduced. Finally, the activated hydrotalcite catalysts may efficiently replace homogeneous catalysts in Claisen-Schmidt condensation reaction of the benzaldehyde and propanal. And it was noteworthy that the calcined cation-type(containing Zn2+?Fe3+) hydrotalcites as catalysts did not show significant activity, in agreement with their low basicity.国家自然科学基金(20203014)资助项

Studies of the Mg-Al and cation-incorporated hydrotalcites

Mg-Al and cation-incorporated(containing Zn2+Ni2+Fe3+) hydrotalcites were synthesized and characterized. A detailed comparative analysis of structure and composition was made. Different cations influenced strongly textural parameters of hydrotalcites and the basicity of the obtained Mg-Al oxides after calcinations. With the cation incorporation, the distance of the brucite and the mount of CO32- as the compensating anion changed. Meanwhile the CO2-TPD was used to determine the basicity of the samples. The results showed that the basicity of the calcined hydrotalcites reduced. Finally, the activated hydrotalcite catalysts may efficiently replace homogeneous catalysts in Claisen-Schmidt condensation reaction of the benzaldehyde and propanal. And it was noteworthy that the calcined cation-type (containing Zn2+, Fe3+) hydrotalcites as catalysts did not show significant activity, in agreement with their low basicity

cDNA Library Construction of Testis and Ovary ofScylla serrata with SMART Technique

采用RDP试剂(改进自ChomczynskiandSacchi1987)提取锯缘青蟹精巢和卵巢的总RNA,经oligotex试剂盒纯化得到mRNA.利用SMART(switchingmechanismat5'endofRNAtranscript)技术,构建成精巢和卵巢的全长cDNA文库.在构建好的文库中,精巢的文库含有约1.45×106的重组子,卵巢的文库含有约为1.75×106的重组子.插入cDNA长度为500bp～3kb,说明两文库均具有良好的质量,为进一步筛选、克隆精巢与卵巢特异表达基因奠定了基础. 【英文摘要】 To clone the testis and ovary specific expression genes of Scylla serrata,we constructed two full-length cDNA libraries using the SMART cDNA library construction kit(Clontech).Total RNA were prepared from testes and ovaries using RDP,a reagent modified from Chomczynski and Sacchi(1987)for the simultaneous isolation of RNA,DNA,and protein.Oligotex(QIAGEN)was used to separate the mRNA of testes and ovaries from total RNA.The"anchor first-strand cDNA"containing asymmetricalSfiⅠrestriction enzyme sites(A&B) was...国家教育部骨干教师基金;; 福建省重中之重项目资