利用便携式血糖仪测定乙醇

研究了便携式血糖仪(PGM)在非糖物质检测方面的应用。基于便携式血糖仪对烟酰胺腺嘌呤二核苷酸(NADH)具有剂量依赖性反应构建酶促反应,提出采用PGM实现对乙醇含量的便携式定量检测。在最佳的检测条件下,当乙醇的体积分数在3%~100%范围内变化时,PGM读数与乙醇含量之间呈现良好的线性关系,线性方程为y=0.70125+0.02148V,相关系数(R2)为0.97351,检出限为3%。     

英国百灵达发明Chloro Sense余氯检测仪

世界领先的致力于水质检测产品的制造商英国百灵达公司不久前宣布推出了一款用于检测水中氯含量的革命性新型便携式仪器——chloroSense余氯检测仪。Thomas Palin博士50年前始创了DPD方法，即通过溶解药片对氯含量进行检测，奠定了“DPD药片检测法”作为工业领域氯含量检测标准方法的地位。ChloroSense的到来具有划时代的革新意义，它打破了长期使用的传统的DPD检测方法。     

3D打印便携式凝胶电泳装置用于蛋白质的快速检测

随着现场分析对于快速、便携和经济型检测的需求,分析仪器的便携化和微型化备受关注。3D打印技术的不断发展,将会极大推动小型化、便携式实验设备的开发和研制。分析仪器的微型化有助于促进资源不足地区在医疗现场、食品安全和环境污染等方面的现场监测。目前,用于蛋白质分离的凝胶电泳装置多为实验室用小型化分析仪器,可用于现场快速分离蛋白质的小型化仪器尚未见报道。该研究设计加工了一款便携式凝胶电泳装置,用于蛋白质的快速分离检测。首先,通过3D打印加工的凝胶电泳装置可在实验室内方便、快捷、低成本的复制。其次,通过对预染蛋白质相对分子质量标准的分离测试,对该系统结构进行优化。优化后该凝胶电泳装置电泳槽的尺寸仅为15 mm×20 mm×17 mm,采用3D打印技术可在5 h内加工完成,耗费打印材料10 mL。正负极所用电泳缓冲液共需4 mL,所使用的25 V锂电池可实现100 h左右的工作时间。装置优化后可实现蛋白质的快速高效分离。随后,在5种常用蛋白质相对分子质量标准的分离中,该装置与商业化平板凝胶电泳分离效果相当,同时具备更快的分离速度。该研究在便携式凝胶电泳装置的开发及其在蛋白质快速分离方面取得了初步成果,但在分离完成后立即对蛋白质进行定量分析以及更多实际样品的应用方面还需要进一步研究。     

便携式气相色谱仪测定海上平台天然气中氮气含量

为保障海上平台安全生产,采用便携式色谱仪对海上平台天然气中氮气进行分析.便携式色谱仪利用气相色谱原理能够准确分析产出气体组成.仪器检测数据精度高,检测速度快,单个样品检测时间为4 min,可连续工作时间为8 h.现场检测表明便携式色谱仪具有操作简单、快速等特点,对快速判定气体成分显示出一定的优越性,为海上油气田天然气中氮气快速检测提供技术支持.     

便携式仪器30min能测出蔬菜药物残留

<正>烟台申报的"便携式农兽药多残留快速检测科技惠民示范工程"获得省科技惠民立项,不久将在3家大型超市开展示范,提供食品安全检测服务。大家买菜时最担心的就是农残问题,但是现在这个问题得到了进一步的解决,最快30 min,最慢4 h就能知道结果。"我们这个项目采用经省级科技成果鉴定为国际领先水平的食品安全检测样品前处理技术,结合CCD成像技术与图片处理软件,研制成功便携式农兽药多残留快速检测仪成套设     

便携式质谱仪的研究进展

面对大气、河流、土壤等化学污染,各种突发性爆炸事故和化学泄漏事件,以及生化武器滥用等等社会问题,迫切需要对源头进行现场原位检测分析.质谱(MS)以其检测速度快、灵敏度高、检测样品量少、可对未知物定性定量检测等特点,非常适合应用于这些现场的分析检测.然而实验室用MS的体积、重量、功耗等较大,不便于搬运,无法实现现场的原位检测.近年来,便携式质谱仪的出现,使得现场原位质谱分析成为可能,并且随着人们对原位质谱分析的要求越来越高,便携式质谱仪从质量分析器、迸样方法,以及真空系统等方面进行了不断改进,并在临床诊断、食品质量控制、法医学、环境学等多个领域发挥了重要作用.文章对近年来便携式质谱仪的发展进行了梳理,并对仪器及其相关部件的未来发展趋势进行了展望.     

便携式智能多参数水质分析仪的研制及其应用系统

利用传感器分析技术、单片机控制技术及系统集成技术,研制了一种新型便携式智能多参数水质分析仪及其应用系统。便携式智能多参数水质分析仪集成有定位、传感器检测、控制、显示等模块,可同时检测水温、pH、溶解氧、电导率、浊度、氨氮、COD等水质参数,测量精度高,稳定性好;内置高性能锂电池,交/直流双系统供电,续航时间超过10 h;集成度高、体积小、总质量小于8kg,便于携带。应用系统人机交互界面友好,可同时与若干台便携式智能多参数水质分析仪进行配网连接,实现多任务并行处理及分析仪管理功能。该便携式智能多参数水质分析仪及其应用系统实现了高度集成、便携化、低功耗、可靠及准确测量,具有操作简单、分析快速、环境友好、无二次污染的特点,适用于水质应急监测、区域水质网格化布点监测及实验室检测等。     

便携式电化学传感平台灵敏检测偶氮类染料日落黄和柠檬黄

构建了一种聚蛋氨酸（p-Met）修饰的激光诱导石墨烯（LIG）电极（p-Met/LIG）,与便携式电化学工作站和掌上电脑应用程序一体化集成,实现了现场同时检测环境水体中的偶氮染料日落黄（SY）和柠檬黄（Tz）。优化了激光加工参数,制备了导电性能最佳的传感界面;在LIG表面电聚合Met,提高了SY和Tz的电化学响应;通过将p-Met/LIG便携式电化学传感器、小型电化学工作站和掌上电脑应用程序一体化集成,搭建了便携式电化学传感平台用于检测SY和Tz。采用差分脉冲伏安法（DPV）测定两种染料,检测SY的线性范围为0.2～20μmol/L和20～100μmol/L,检出限低至0.001μmol/L;检测Tz的线性范围为0.3～40μmol/L和40～100μmol/L,检出限为0.005μmol/L。p-Met/LIG具有优良的抗干扰性能、稳定性和重现性。将此便携式传感平台用于实际水样检测,结果表明,此平台适用于实际环境水体中SY和Tz的即时现场检测。     

基于智能手机现场快速检测技术研究进展

作为一种便携式的功能性移动电子设备,智能手机的广泛应用为便携式检测提供了发展平台,并在临床诊断、食品安全分析和环境监测等领域表现出巨大的应用潜力。本文综述了2018～2022年,基于智能手机与比色法、荧光法、化学发光法、电化学分析、免疫分析及微流控分析等技术联用的即时检测应用研究进展,并对其发展趋势和应用前景进行了展望。     

用于肿瘤标志物现场快速检测的便携式仪表的研制

针对肿瘤标志物高灵敏度现场快速检测的需求,将电化学检测技术与电子技术相结合,采用差分脉冲伏安法(Differential pulse voltammetry,DPV)研制了一种可用于肿瘤标志物现场快速检测的便携式仪表,检测电压和电流的分辨率分别为0.8 mV和1nA.结合实验室自制微流控纸芯片,利用该便携式仪表对肿瘤标志物癌胚抗原(Carcinoembryonic antigen,CEA)进行检测,实验结果表明,在1～500 μg/L浓度范围内,DPV峰值电流响应与CEA抗原浓度对数呈线性关系,线性相关系数为0.998,检出限为10 pg/mL.根据抗原抗体特异性结合和电化学检测原理,检测到电化学反应的微弱电流后,仪表可以根据已经标定的电流与浓度之间的比例关系自动计算出肿瘤标志物的浓度.此便携式仪表具有检测灵敏度高、检出限低等优点,可广泛应用于肿瘤标志物的即时检测.     

Miniaturization of Gas-Chromatographic Instruments

The current state trends in the development of portable gas chromatographs were considered. A classification of portable chromatographs was proposed (compact devices, field devices, on-chip micro chromatographs, and special micro chromatographs). Performance and analytical characteristics of domestically produced and foreign portable chromatographs were presented. Portable gas chromatographs for space exploration, high-flow-rate gas chromatography, and new applications of portable chromatographs were considered.     

Portable Raman versus portable mid-FTIR reflectance instruments to monitor synthetic treatments used for the conservation of monument surfaces

This study aims to evaluate the relevance of portable Raman and portable mid-Fourier transform infrared (FTIR) reflectance instruments in monitoring the synthetic treatments applied on plaster substrates, a crucial issue in a conservation work. Some polymeric consolidants and protectives have a relatively short life owing to their degradation, and after some years the surface should be retreated. It follows that any information about the presence and composition of the products applied, their chemical transformations and their distribution on the surfaces is essential. For these purposes, conservation scientists should seek and test new in situ methods, and this is of utmost importance especially in the case of buildings, considering their large dimensions and consequent extensive mapping. The effectiveness of portable Raman and portable mid-FTIR reflectance instruments has been compared by analysing a set of laboratory specimens prepared and treated with variable amounts of products belonging to three classes of polymers; the spectroscopic investigation highlighted, for the first time, the limits and the advantages of portable Raman and portable mid-FTIR reflectance instruments in the detection of small amounts of products commonly employed for the conservation of plasters.     

An effervescent reaction micropump for portable microfluidic systems

A water-activated, effervescent reaction was used to transport fluid in a controllable manner on a portable microfluidic device. The reaction between sodium bicarbonate and an organic acid, tartaric acid and/or benzoic acid, was modeled to analyze methods of controlling the generation of carbon-dioxide gas for the purposes of pumping fluids. Integration and testing of the effervescent reaction pump in a microfluidic device was made possible by using elastomeric polymers as both photopolymerizable septa and removable lids. These materials combined to enable facile access to otherwise gas-tight devices. Based on theoretical predictions for 0.33 mg of sodium bicarbonate and a stoichiometric amount of organic acid, the pumping flow rate could be varied from 0.01 microL s(-1) to 70 microL s(-1). The flow rate is controlled by adjusting any or all of the particle size of the least soluble reactant, the amount of reactants used, and the type of organic acid selected. The tartaric acid systems rapidly produce carbon dioxide; however, the gas generation rates dramatically decrease over the course of the reaction. In contrast, carbon dioxide production rate in the benzoic acid systems is lower and nearly constant for several minutes. Water activation and direct placement on a microfluidic device are key features of this micropump, which is therefore useful for portable microfluidic applications.     

Nanopore membrane-based electrochemical immunoassay

Using nanotechnology in the immunoassay field, Lynntech has developed a nanopore-based sensor with electrochemical signal transduction for the detection of biologically relevant molecular targets. Antibodies of interest were immobilized on the inside wall of nanopores and the antibody–antigen interaction was monitored by measuring the ionic conductance through the nanopores. We have used electrochemical impedance spectroscopy to monitor the changes in the ionic conductance due to the antibody–antigen interaction. To aid the development of a portable, fast immunoassay instrument, we have selected specific impedance frequency values that are very sensitive to the ionic conductance changes. Biomarkers of prostate cancer, prostate-specific antigen and hepsin, were successfully assayed by the nanopore membrane-based electrochemical immunoassay in both phosphate-buffered saline and plasma medium.     

Aptamers: The Powerful Molecular Tools for Virus Detection

Aptamers are short single-stranded DNA or RNA oligonucleotides selected by the technique of systematic evolution of ligands by exponential enrichment (SELEX). Aptamers have been demonstrated to bind various targets from small-molecule to cells or even tissues in the way of antibodies. Thus, they are called chemical antibodies. We summarize and evaluate recent developments in aptamer-based sensors (for short aptasensors) for virus detection in this review. These aptasensors are mainly classified into optical and electronic aptasensors based on the type of transducer. Nowadays, the smartphone has become the most widely used mobile device with billions of users worldwide. Considering the ongoing COVID-19 outbreak, smartphone-based aptasensors for a portable and point-of-care test (POCT) of COVID-19 detection will be of great importance in the future.     

Portable capillary electrophoresis system with potential gradient detection for separation of DNA fragments

A portable capillary electrophoresis (CE) system with a novel potential gradient detection (PGD) was utilized to separate DNA fragments. For the first time it was demonstrated that separation of DNA fragments in polymer solution could be detected by a portable CE system integrated with PGD, with a limit of detection (LOD) comparable to that of the CE-ultraviolet (UV) method. Effects of buffer solution, sieving medium, and applied voltage were also investigated. The portable CE-PGD system shows several potential advantages, such as simplicity, cost effectiveness, and miniaturization.     

Dynamic solid phase microextraction for sampling of airborne sarin with gas chromatography-mass spectrometry for rapid field detection and quantification

A portable dynamic air sampler and solid phase microextraction were used to simultaneously detect, identify, and quantify airborne sarin with immediate analysis of samples using a field portable gas chromatography-mass spectrometry system. A mathematical model was used with knowledge of the mass of sarin trapped, linear air velocity past the exposed sampling fiber, and sample duration allowing calculation of concentration estimates. For organizations with suitable field portable instrumentation, these methods are potentially useful for rapid onsite detection and quantification of high concern analytes, either through direct environmental sampling or through sampling of air collected in bags.     

Application of portable Raman instruments for fast and non-destructive detection of minerals on outcrops

Raman spectral signatures have been obtained in situ for a series of minerals using portable Raman instruments. Cerussite, anglesite, wulfenite, titanite, calcite, tremolite, andradite and quartz were detected using portable Raman spectrometer First Defender XL (Ahura). Baryte, almandine and realgar Raman spectra obtained by this instrument in the field were compared to the data measured by the other mobile Raman instrument Inspector Raman (DeltaNu). Bench Raman dispersive microspectrometer (InVia Reflex, Renishaw) was used for comparative purposes. All spectra were obtained using a 785nm diode excitation. Although displaying lower spectral resolution comparing with the laboratory confocal instrument both portable instruments permit unambiguous detection of minerals in the field. These possibilities designate portable Raman machines as excellent tools for field geological applications. Miniaturised Raman instrument combined with LIBS will be included in the payload of the EXO Mars mission and would open interesting research possibilities in other in situ field planetary studies.     

Portable Raman explosives detection

Recent advances in portable Raman instruments have dramatically increased their application to emergency response and forensics, as well as homeland defense. This paper reviews the relevant attributes and disadvantages of portable Raman spectroscopy, both essentially and instrumentally, to the task of explosives detection in the field.