PDF全文下载:2015050493
混旭
(青岛科技大学 化学与分子工程学院,山东 青岛 266042)
摘要:研究了一种利用DNAzyme和磁珠以及葡萄糖仪测定L组氨酸的新方法。首先,将DNAzyme固定在磁珠表面,以基质DNA修饰转化酶金纳米粒子为探针,通过DNA杂交作用,将探针固定在磁珠表面。当有目标物L组氨酸存在时,L组氨酸与DNAzyme发生识别作用,将基质DNA切割,导致探针脱落,然后将脱落的探针溶液中加入果糖,在探针表面转化酶的作用下,将果糖转化为葡萄糖,利用葡萄糖仪为检测仪器,实现对L组氨酸的测定。方法的检测限为008 nmol·L-1,另外,该方法对L组氨酸的测定表现出了良好的选择性。
关键词: L组氨酸; 葡萄糖仪; DNAzyme; 磁珠
中图分类号: O 652 文献标志码:A
Using Personal Glucose Meters and DNAzyme to Detect LHistidine
HUN Xu
(College of Chemical Engineering,Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: We reported a new method for Lhistidine detection using lowcost, simple, and widely accessible personal glucose meters coupling DNAzyme and magnetic beads. The DNAzyme was first immobilized onto the surface of magnetic beads. Then the substrate which was labeled onto AuNPs modified with invertase hybridized with the DNAzyme. The introduction of Lhistidine induced selfcleavage of DNAzyme and the invertase modified AuNPs was released from the magnetic beads and produced measurable glucose signals through invertasecatalyzed hydrolysis of sucrose. The experimental results demonstrated it can be to detect 0.08 nmol·L-1 Lhistidine using PGM. The method also showed excellent selectivity.
Key words: Lhistidine; personal glucose meters; DNAzyme; magnetic beads
收稿日期: 20140528
基金项目: 国家自然科学基金项目(21005045, 21275085);
青岛市专项基金项目(12143(18)jch).
作者简介: 混旭(1975—),男,副教授.
文章编号: 16726987(2015)05049304; DOI: 10.16351/j.16726987.2015.05.004