纸芯片微流控技术的发展及应用

纸芯片微流控技术是一种新型微流控技术。相比于以玻璃、石英、高聚物等为基底的传统微流控芯片,纸芯片具有成本低、易操作、可携带、耗样量小等优点。该文介绍了纸芯片的发展及常用的制作方法,并举例说明了光度法、荧光法、化学发光及电化学发光法和电化学法在纸芯片检测中的应用;归纳了纸芯片技术在临床诊断、环境监控以及食品安全分析等方面的应用;最后对纸芯片微流控的应用前景进行了展望。     

化学发光检测在微流控芯片中的应用综述

综述了近年来化学发光检测在微流控芯片中的应用.指出微流控芯片(又称为"芯片实验室"或者"微型全分析系统")因具有小型化、集成化和自动化等特点而在近20年来日益受到关注,而化学发光检测具有仪器结构简单、背景噪音低、操作和维护成本低等优点,非常适合用作微流控芯片的检测手段.     

微流控芯片荧光检测系统研究进展

评述了1996～2010年以来微流控芯片荧光检测系统的研究进展,主要介绍微流控芯片中荧光检测系统,包括激光诱导荧光（LIF）、发光二极管（LED）诱导荧光和其他荧光检测装置的原理、光路结构及其应用（引用文献60篇）。     

微流控纸芯片的加工技术及其应用

微流控纸芯片是一种新兴的微流控分析技术平台,具有成本低、加工简易、使用和携带方便等优点,在临床诊断、食品质量控制和环境监测等应用领域具有很大的应用前景,近年来,引起广大科学工作者极大的兴趣。本文着重介绍目前文献相继报道的各种纸芯片加工技术,包括紫外光刻、蜡印、等离子体处理、喷墨打印、喷墨溶剂刻蚀、绘图、柔印和激光光刻等技术。此外,还介绍了微流控纸芯片分析中的检测方法及其应用。     

微流控芯片在食品安全分析中的应用进展

微流控芯片技术可以实现从样品处理到检测的微型化、自动化、集成化及便携化,因而在食品安全检测方面展现出强大的发展活力。目前微流控芯片技术在农药残留、兽药残留、重金属、食品添加剂等食品安全检测方面已取得了一系列重要进展。该文着重介绍了微流控芯片技术在食品安全分析中的研究进展,并展望了其在食品安全分析中的应用前景。     

微流控芯片技术在临床检测中的应用进展

临床检测微流控芯片是微全分析系统的一个重要研究前沿。根据检测对象和检测方法的不同,本文从免疫分析、蛋白质分析、核酸分析、细胞分析和小分子分析5个方面对微流控临床检测的最新技术进行了全面地评述。引用文献45篇。     

微流控芯片的研究及产业化

以大连研究团队的近期工作为基础,结合2015年末召开的“深圳-大连微流控芯片及其产业化战略研讨会”内容,扼要阐述作者对近期微流控芯片的研究及产业化的基本看法.鉴于微流控芯片研究的主流已从平台构建和方法发展转为不同领域的广泛应用,本文重点介绍了微流控芯片在现代生物化学分析、即时诊断、材料筛选-材料合成以及组织-器官仿生等4个应用领域的研究趋势,讨论了3D打印技术的崛起对微流控芯片的影响和挑战,阐述了微流控芯片作为当代极为重要的新兴科学技术平台和国家层面产业转型的潜在战略领域,在全球范围内产业化的发展势头.全文引用文献69篇.     

微流控芯片电泳技术在临床检测中的新进展

微流控芯片电泳技术作为一种消耗少、速度快、效率高的分析技术,可同时实现便携化、集成化、高通量,在临床检测中发挥着重要作用。该文综述了近年来微流控芯片电泳技术在临床应用方面的研究进展,主要包括微流控芯片电泳技术在小分子、氨基酸、蛋白质、核酸、细胞等方面的应用近况。同时,介绍了一种崭露头角的基于大管电泳技术的大通道电泳微流控芯片技术,最后对微流控芯片电泳技术实现临床分析进行了展望。     

微流控芯片光学检测技术在细胞研究中的应用与进展

重点综述了芯片上细胞培养和实时检测的微系统研究及相应检测方法和技术近年来的进展.总结了多种光学检测方法和技术体系的优缺点及发展趋势,讨论了各种方法技术对细胞研究模型的研究适用范围,探讨各种检测方法和技术对活细胞、单细胞实时无损无标记检测和传感发展前景和研究进展.最后对整个芯片实验室框架下细胞研究及传感微系统的发展方向进行了有益的思路和方法展望.     

微流控SERS芯片的设计制备及其在细菌检测中的应用

微流控芯片分析平台与表面增强拉曼散射(Surface enhanced Raman scattering,SERS)光谱分析方法结合,充分利用了SERS法所具备的样品前处理简便、检测无损、成分辨识度高以及适宜水环境检测等优点,在生化分析检测领域备受关注。微流控SERS芯片设计及芯片上SERS增强基质的制备是构建微流控SERS芯片分析方法和系统的关键,也是提高检测灵敏度和可重复性的核心问题。该文在介绍微流控SERS芯片的基本构型和功能的基础上,重点综述了微流控SERS芯片上SERS基质的制备方法及其测试效果。基于微电子机械系统(Micro-Electro-mechanical-System,MEMS)加工技术制备的SERS基质,具有纳米粒径有序可控、便于集成制备但增强基质材料种类有限的特点;基于化学沉积和自组装等理化方法制备的SERS基质具有基质种类易拓展、成本低、与微流控通道结合方法灵活等特点。在这些基础上构建的微流控SERS芯片及其分析测试方法和系统,在细菌等许多生化检测领域显示出强大的发展潜力。     

基于微流控驱动和控制技术的临床生化分析系统研究进展

微流控技术具有微量、高效、高通量、微型化、集成化、自动化的特点,为实现现场化、低成本的临床生化分析提供了一条可行的技术途径。针对于目前临床生化分析中复杂流体操控的难点,该文依据系统中采用驱动和控制方式的不同,对各种基于微流控技术的临床生化分析系统进行了分类介绍,同时也介绍了市场上商品化的微流控生化分析仪器,并对其各自特点进行了综合评述。     

基于微流控芯片的乳腺癌细胞微环境酸化检测

建立了基于微流控芯片的乳腺癌微环境酸化模型和动态检测微环境酸化情况的分析方法。设计了一种多层复合式微流控芯片,将乳腺癌细胞悬液引入含有水凝胶前体的芯片培养室后,在硝酸纤维素薄膜上固化形成3D培养支架。芯片通道连续灌流模拟血流供应,并将非电化学的pH检测器引入芯片,通过图像分析得到实时的pH变化。通过观察癌细胞的存活率、增殖率、乳酸水平及pH值,分析微环境的酸化情况,同时与正常细胞进行比较。结果表明,连续灌流培养7 d,乳腺癌细胞的存活率保持在90%以上;随着培养天数的增加,芯片上癌细胞微环境的pH值逐渐降低,且灌流速度越低,pH值下降越明显,而正常细胞微环境的pH值无明显变化。基于微流控芯片的微环境酸化检测平台可实时动态检测微环境的pH值,有望成为相关肿瘤研究的有力工具。     

Determination of nitrite in saliva using microfluidic paper-based analytical devices

Point-of-care platforms can provide fast responses, decrease the overall cost of the treatment, allow for in-home determinations with or without a trained specialist, and improve the success of the treatment. This is especially true for microfluidic paper-based analytical devices (μPAD), which can enable the development of highly efficient and versatile analytical tools with applications in a variety of biomedical fields. The objective of this work was the development of μPADs to identify and quantify levels of nitrite in saliva, which has been proposed as a potential marker of periodontitis. The devices were fabricated by wax printing and allowed the detection of nitrite by a colorimetric reaction based on a modified version of the Griess reaction. The presented modifications, along with the implementation of a paper-based platform, address many of the common drawbacks (color development, stability, etc.) associated with the Griess reaction and are supported by results related to the design, characterization, and application of the proposed devices. Under the optimized conditions, the proposed devices enable the determination of nitrite in the 10–1000 μmol L⁻¹ range with a limit of detection of 10 μmol L⁻¹ and a sensitivity of 47.5 AU [log (μmol L⁻¹)]⁻¹. In order to demonstrate the potential impact of this technology in the healthcare industry, the devices were applied to the analysis of a series of real samples, covering the relevant clinical range.     

微流控芯片分选临床样品中循环肿瘤细胞的研究进展

癌症作为常见病正严重威胁着我国乃至全球居民的健康。循环肿瘤细胞(CTCs)是一类由癌变部位释放并进入血液中的癌细胞,其在癌症的早期诊断、个体化及肿瘤转移机制研究等方面的作用正逐渐被发现和认可,但由于血液中的CTCs含量极少,对其分选极具挑战。微流控芯片作为一种微型化、高通量、集成化平台,在CTCs研究中彰显了独特的优势,相关报道也越来越多。随着研究的深入,微流控芯片技术不再局限于基于模型样品的方法学开发,而是更注重于能否用于临床实际样品中CTCs的检测,但目前未见该角度的综述报道。为此,文章综述了近年来用于临床实际样品CTCs分析的微流控芯片分选技术,并探讨了微流控芯片用于CTCs分选的发展趋势。     

Simultaneous electrochemical detection in paper-based analytical devices

The growing need for reliable analytical tools to perform measurements at the point-of-need has prompted the development of novel sensors that are low cost, portable, sensitive, easy to use, and capable of multiplexed analysis. Miniaturization of the sensors into microfluidic platforms has become a promising approach to achieve these self-contained sensors. However, traditional microfluidics often require relatively expensive and complicated pumping mechanisms that increase the cost and limit the portability of the sensors. From a material perspective, paper is an attractive substrate for constructing point-of-need sensors because of its affordability, vast availability, and self-pumping ability, particularly when combined with electrochemical detection. In this mini-review, we discuss various strategies to achieve multiplexing or simultaneous detection of multiple analytes in electrochemical paper-based devices and provide a brief guide on selecting the detection strategy based on the electrochemical property of the analytes.     

Chelate titrations of Ca and Mg using microfluidic paper-based analytical devices

We developed microfluidic paper-based analytical devices (μPADs) for the chelate titrations of Ca²⁺ and Mg²⁺ in natural water. The μPAD consisted of ten reaction zones and ten detection zones connected through narrow channels to a sample zone located at the center. Buffer solutions with a pH of 10 or 13 were applied to all surfaces of the channels and zones. Different amounts of ethylenediaminetetraacetic acid (EDTA) were added to the reaction zones and a consistent amount of a metal indicator (Eriochrome Black T or Calcon) was added to the detection zones. The total concentrations of Ca²⁺ and Mg²⁺ (total hardness) in the water were measured using a μPAD containing a buffer solution with a pH of 10, whereas only Ca²⁺ was titrated using a μPAD prepared with a potassium hydroxide solution with a pH of 13. The μPADs permitted the determination of Ca²⁺ and Mg²⁺ in mineral water, river water, and seawater samples within only a few minutes using only the naked eye—no need of instruments.     

Electrochemical detection in paper-based analytical devices using microwire electrodes

Microwire electrodes are presented as an alternative to screen-printed electrodes for detection in electrochemical paper-based analytical devices (ePADs). Compared to carbon ink electrodes, microwire electrodes offer lower resistance and a significant increase in current density relative to carbon ink electrodes. Various microwire compositions and diameters, including 30 μm Pt, 25 μm Au, 18 μm Pt with 8% W, and 15 μm Pt with 20% Ir, were tested and compared to theoretically predicted behavior. The measured current in static solution was below predicted levels for cylindrical microelectrodes but greater than levels predicted for hemi-cylindrical electrodes most likely as a result of the proximity of the electrode to the paper surface. Furthermore, the current response was indicative of semi-thin layer behavior, likely due to the confined solution volume in the paper. After electrode characterization, a device was developed for the non-enzymatic detection of glucose, fructose, and sucrose using a Cu electrode in alkaline solution. The limits of detection for glucose, fructose, and sucrose were 270 nM, 340 nM, and 430 nM, respectively, which are significantly below sugar concentrations found in sweetened beverages or glucose levels in serum.     

微流控芯片分选富集循环肿瘤细胞的研究进展

近年来,循环肿瘤细胞(CTCs)研究得到了越来越多的关注,许多研究报告已经证实其在肿瘤转移的早期诊断、治疗方案选择、个体化治疗及探索肿瘤转移机制等方面具有潜在的价值,然而CTCs在循环系统中的含量极低,这成为限制其临床相关应用的主要难点。微流控芯片技术具有低成本、快速、高通量及操作简单等优势,利用微流控芯片可实现CTCs的高速、高回收率、高纯度的分选富集,近年来得到广泛的关注。本文综述了近年来在微流控芯片内进行CTCs分选富集的研究并探讨了各种方法的优缺点,并在本研究团队的研究基础上进行了展望。