低背景信号的高级生物分析方法：光电化学生物分析

光电化学传感是近年来兴起并发展迅速的一种生物分析技术,其检测的主要原理是生物识别原件识别靶标物质而引起光电活性材料的光电性能变化,最终导致光电流值发生变化,从而达到检测的目的。由于光电化学生物分析中输入信号是光,输出信号是电,这赋予了此种检测方法背景信号低、灵敏度高的天然优势,这种优势所展现出来的潜力使光电化学分析在检测领域受到了越来越多的关注。本文介绍了光电化学生物传感的基本原理、光电活性材料的分类以及光电化学生物传感的传感模式,最后对其未来的发展进行了展望。     

超临界流体色谱-紫外检测法同时测定混纺地毯中8种致敏性分散染料

建立了超临界流体色谱-紫外检测同时测定混纺地毯中分散黄1、分散黄49、分散黄9、分散橙37/76、分散红1、分散橙1、分散橙3和分散棕1共8种致敏性分散染料的分析方法。样品在70℃水浴中经甲醇超声萃取30 min后,以超临界态二氧化碳-甲醇(90∶10,v/v)为流动相,等度洗脱,在440 nm波长下检测。8种致敏性分散染料在12 min内即可实现分离,其在各自的线性范围内均具有良好的线性关系,相关系数(r~2)为0.999 2~0.999 8,方法的检出限(LOD,S/N=3)为0.05~0.10 mg/L。用该方法分析8种致敏性分散染料,其峰面积的相对标准偏差(RSD)均小于1.2%(n=5)。8种染料在实际样品中的加标回收率为95.6%~104.2%。该方法可以对混纺地毯等纺织品中8种致敏性分散染料进行检测,方法简便、快速、灵敏、选择性高、结果准确,能满足纺织品中致敏性分散染料的检测标准。     

量子点传感器在有机磷农药残留检测中的应用

有机磷农药作为一种神经毒剂,在过量使用后会造成许多潜在危害,如污染作物、环境以及使人畜中毒等。因此,建立高灵敏、高特异的有机磷农药残留检测方法对于保障食品安全与人体健康具有重要意义。基于量子点的传感器分析检测方法因其具有灵敏度高、特异性强、响应速度快、操作简单等优势,在有机磷农药残留检测方面成为研究热点与发展趋势。本文对国内外近年来量子点传感器在作物、环境以及生物样品中有机磷农药残留检测的应用进展进行了综述,并对该领域的前景进行了展望。     

1.55-μm Si-based MOEMS optical tunable filter

A prototype 1.55-μm Si-based micro-opto-electro-mechanical-systems (MOEMS) tunable filter is fabricated, employing surface micromachining technology. Full-width-at-half-maximum (FWHM) of the transmission spectrum is 23 nm. The tuning range is 30 nm under 50-V applied voltage. The device can be readily integrated with resonant cavity enhanced (RCE) detector and vertical cavity surface emitting laser (VCSEL) to fabricate tunable active devices.     

Icephobic performance on the aluminum foil-based micro-/nanostructured surface

The research of superhydrophobic materials has attracted many researchers' attention due to its application value and prospects.In order to expand the serviceable range,people have investigated various superhydrophobic materials.The simple and easy preparation method has become the focus for superhydrophobic materials.In this paper,we present a program for preparing a rough surface on an aluminum foil,which possesses excellent hydrophobic properties after the treatment with low surface energy materials at high vacuum.The resulting contact angle is larger than 160° and the droplet cannot freeze on the surface above-10 ℃.Meanwhile,the modified aluminum foil with the thickness of less than 100 μm can be used as an ideal flexible applied material for superhydrophobicity/anti-icing.