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1.
采用分子印迹技术,以苯甲酸为模板分子,1,4-二乙烯基苯为交联剂,分别以α-甲基丙烯酸和丙烯酰胺为功能单体,合成了苯甲酸具有特异性吸附能力的两种分子印迹聚合物,其中用α-甲基丙烯酸合成的分子印迹聚合物对模板分子苯甲酸的氢键作用力和结合能力都比较强。  相似文献   

2.
以芹菜甲素为模板分子,通过沉淀聚合法制备了芹菜甲素分子印迹聚合物(MIPs)和非分子印迹聚合物(NIPs),并通过动态吸附、静态吸附和选择性吸附实验对所制备的分子印迹聚合物的吸附性能进行了表征.结果表明,当芹菜甲素的浓度为0.1 mmol L~(-1),吸附时间为12 h时,MIPs达到吸附平衡且最大吸附量为3.561 mg g~(-1).Scatchard分析表明,在MIPs中存在高亲和性和低亲和性两种结合位点,而在NIPs中只存在一种非特异性结合位点.选择吸附实验表明,MIPs对芹菜甲素具有高选择性和良好的专一识别性能.该研究可为芹菜甲素分子印迹聚合物作为固相萃取材料分离提取中药中有效成分芹菜甲素提供了理论基础.  相似文献   

3.
平衡法表征对苯二胺分子印迹聚合物的分子识别性能   总被引:1,自引:1,他引:0  
采用非共价分子印迹技术,以对苯二胺(p-PD)为模板分子,甲基丙烯酸为功能单体,制备了p-PD分子印迹聚合物,并利用静态平衡法研究了印迹聚合物的结合能力和选择性。结果表明,在印迹聚合物中存在两类结合位点,离解常数分别为2.57×10^-4mol/L和3.71×10^-3mol/L;对应的最大结合位点数分别为19.7μmol/g和80.7μmol/g;p-PD印迹聚合物能够选择性结合p-PD。  相似文献   

4.
以对羟基苯甲酸丁酯为模板,α-甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,聚乙烯醇为分散剂,采用悬浮聚合法在氯仿溶剂中制备了分子印迹聚合物(MIP)。通过考察该聚合物对模板分子的间歇式吸附实验表明,所制备的分子印迹聚合物对模板分子的吸附较快,最大表观结合量近270μg/g。Scatchard方程研究表明在研究的浓度范围内在聚合物中形成了两类不同的结合位点。  相似文献   

5.
蛋白质分子印迹聚合物具有高度选择吸附性,能专一性识别蛋白质模板分子.本文综述了蛋白质分子印迹聚合物的制备、选择性识别机制及其选择性吸附的影响因素,并对蛋白质分子印迹技术的应用前景进行了展望。  相似文献   

6.
以光引发剂二乙基二硫代氨基甲酸钠对硅胶表面进行修饰,以氨基比林为模板分子、甲基丙烯酸为单体、乙二醇二甲基丙烯酸酯为交联剂,在修饰后的硅胶表面接枝共聚制备分子印迹聚合物。利用红外光谱、电镜对聚合物进行了表征,用紫外分光光度法考察了分子印迹聚合物对氨基比林的吸附特性。结果表明,印迹聚合物对模板分子具有较高的吸附能力和选择识别能力。  相似文献   

7.
硅胶表面双酚A分子印迹聚合物的制备和识别特性   总被引:1,自引:0,他引:1  
采用表面分子印迹技术,在硅胶表面合成了基于双酚A的分子印迹聚合物,用紫外光谱分析了模板分子的洗脱效果,用扫描电子显微镜表征了印迹聚合物的表面形貌。静态吸附实验表明,该印迹聚合物对双酚A具有较好的选择性吸附。  相似文献   

8.
以水杨酸为模板分子,通过制备印迹聚合物作为敏感材料,制成检测水杨酸的电导型传感器。测试了水杨酸印迹聚物[P(SA)]对水杨酸(SA)的吸附特性。该传感器在pH6.0的缓冲介质中,对浓度范围为0.01-0.1mmol L-1的水杨酸有明显的电导响应,寿命为5个月。通过对传感器选择性,灵敏度和稳定性测试,结果证明水杨酸分子印迹聚合物可以作为敏感物质用于水杨酸传感器的开发研制。  相似文献   

9.
以Pn^2+为模板分子,以巯基壳聚糖为功能单体合成了交联巯基壳聚糖分子印迹聚合物.并研究其合成、吸附和洗脱条件,结果表明:合成的分子印迹聚合物抗酸性提高了,且保留了对Pb^2+良好的吸附性和识别选择性.  相似文献   

10.
采用非共价印迹技术,以3,4,5-三羟基苯甲酸(3,4,5-THBA)为印迹分子,丙烯酰胺为功能单体,乙二醇二甲基丙烯酸酯为交联剂,乙腈为致孔剂,60℃热引发制备了印迹聚合物P(3,4,5-THBA),用高效液相色谱法和Scatchard作图评价了其选择性结合特性。结果表明,P(3,4,5-THBA)对3,4,5-THBA具有选择性结合能力,氢键结合在其分子识别过程中起主要作用,其中存在两类结合位点,高亲和力结合位点的离解常数KD1=2.4×10-4mol/L,最大结合位点数Qmax1=30.6μmol/g;低亲合力结合位点的离解常数KD2=2.3×10-3mol/L,最大结合位点数Qmax2=91.1μmol/g。  相似文献   

11.
汉字倒说     
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。  相似文献   

12.
《海外英语》2007,(5):44-45
It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,  相似文献   

13.
一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/  相似文献   

14.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?  相似文献   

15.
钱生钱!     
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了  相似文献   

16.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.  相似文献   

17.
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex.  相似文献   

18.
王菲 《华章》2007,(12):273-273
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.  相似文献   

19.
现在,我们可以没有面包,没有钱,没有房子,没有车子……但我们唯独不能丢失的是高尚的情操,笃定的信念,还有,满满的希望!  相似文献   

20.
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator's Garden. Translating building data to the Virtual Reality Modeling Language (VRML) is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching.  相似文献   

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