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1.
为了有效利用金标试纸图像中的颜色信息,针对3个颜色空间HSV、CIEXYZ和CIELab,采集6种浓度的视黄醇结合蛋白(RBP4)的金标试纸的彩色图像,对检测线和质控线的颜色数据建立云模型,得到特征向量的夹角与质量浓度之间的映射关系.实验结果表明,在CIELab颜色空间中映射效果最好,二次拟合曲线的拟合相关度为0.95.利用特征数据与浓度的二次拟合曲线可定量检测视黄醇结合蛋白的质量浓度,进而为肾小管疾病的诊断提供判别依据.  相似文献   

2.
以三氨基三羰基铬与对二甲氨基苯甲醛缩巴比妥酸为原料,合成了一种新型高灵敏度检测三聚氰胺的红外化学传感器分子——对二甲氨基苯甲醛缩巴比妥酸三羰基铬。通过元素分析、质谱、核磁共振及红外光谱对其结构进行了表征。红外吸收光谱研究表明,在乙醇溶剂中,当三聚氰胺的浓度高于1.0×10~(-7) mol/L时,金属羰基的红外吸收峰与三聚氰胺的浓度呈线性关系。利用该红外化学传感器分子可初步实现对三聚氰胺的微量检测,检测误差低于5%。  相似文献   

3.
利用纳米金的表面等离子共振吸收光谱研究了谷胱甘肽(GSH)、L半胱氨酸(L-Cys)和6-巯基嘌呤(6-MP)3种巯基化合物与纳米金作用的机理.结果表明,3种巯基化合物均能诱导纳米金聚集导致其表面等离子共振吸收峰红移.聚集后的纳米金对介质环境(如溶液极性)的变化较敏感,其吸收峰随着加入分析物的极性变化有规律地红移,并且吸光度也线性下降.可根据波长的红移或吸光度变化确立定量关系,可望用于分析对象的定量检测.  相似文献   

4.
通过减薄、键合、抛光等技术加工成厚度达到10μm左右的超薄晶片,然后通过蒸金、黑化等处理技术将其制备成红外敏感元件.根据红外光谱吸收原理,为提高分辨率和选择性吸收性能,在敏感元件前段集成了窄带滤光片.制备的敏感元件与选用的窄带滤光片,以及CMOS放大器与电阻和电容各一个都被封装和集成在一个TO-18型管壳内,最终被设计加工成为单一通道的红外探测器,其滤光片可根据要求的波带范围进行更换.利用两个吸收波长分别为(3 310±90)nm和(3 910±60)nm的单元探测器,设计并制作了一个微型气体传感器.该气体传感器能实现检测一些烃类气体,文中对乙烯气体进行了实验测试,并进行了实验数据分析.分析结果表明:这种气体传感器具备较好的检测气体浓度的能力,能检测的最大量程为30 000×10-6,达到分辨100×10-6的检测能力,且具有较好的重复性.  相似文献   

5.
离子色谱法检测含蛋白质食品中三聚氰胺   总被引:1,自引:0,他引:1  
目的:建立离子色谱法检测含蛋白质食品中三聚氰胺的方法。方法:样品经冰乙酸溶液提取并沉淀蛋白,Dionex OnGuardⅡ RP样品前处理小柱除去脂肪等大分子有机物,采用Dionex IonpacCS17分离柱,3mmol/L H2SO4淋洗液等度淋洗,流速:1.2mL/min,在紫外波长240nm下检测。结果:三聚氰胺在0.5-50.0mg/L的范围内,质量浓度与色谱峰面积呈良好的线性关系(R2>0.9992),方法检出限(MDL)为0.06mg/kg,不同加标量的阴性样品加标回收率在84.8%-103.2%范围内,相对标准偏差RSD<4.0%。结论:该方法简便易行、快速,无干扰,不用有毒试剂,对环境友好,检测成本低,灵敏度高,检测结果准确度高,易于推广,适合对各种含蛋白食品中三聚氰胺的检测分析。  相似文献   

6.
真菌毒素检测仪是一种可对一次性检测卡中的免疫层析带进行定量检测和分析的精密仪器。与适宜的试纸配套使用,供医疗机构用于免疫学项目的测定,为定量和半定量的荧光测定。具有检测快速、灵敏等特点,越来越受到市场的关注。但目前没有机构展开真菌毒素检测仪相关检测校准,本文旨在解决该类仪器计量校准难题。  相似文献   

7.
ZnS/CdS单带差超晶格薄膜的制备及光学性质研究   总被引:1,自引:0,他引:1  
为了提高CdTe太阳电池的效率,ZnS/CdS单带差超晶格被创新性地提出.用射频磁控溅射法制备了ZnS/CdS单带差超晶格薄膜,用SEM观察样品截面,分层清晰;测试了ZnS/CdS单带差超晶格薄膜的透过谱图,在300~800nm波长范围内存在4个明显的透过峰.相较于CdS单层膜与ZnS单层膜,ZnS/Cds单带差超晶格薄膜在可见光短波部分的光谱响应十分明显,说明Zns/Cds单带差超晶格薄膜的电子能带与光子吸收方式发生了明显的变化.理论上可以提高CdTe太阳电池的效率.  相似文献   

8.
以试纸为载体,基于重金属铅单克隆抗体,建立纺织品中有害重金属铅的快速筛查方法。该试纸对纺织品汗液中总铅含量和可萃取铅含量的检测限分别是1mg/kg和0.2mg/kg,可在3-5min内完成样品的定性或半定量的测试,其灵敏度、特异性和稳定性,完全满足实际样品的检测要求,适用于样品现场快速筛选的要求。  相似文献   

9.
目的针对可食包装纸原料中的玉米赤霉烯酮进行检测,采用以酶联免疫法为主,胶体金试纸条检测法为辅的免疫分析方法,为实时监控食品的包装、包装存储条件等提供有效技术手段。方法实验主要选取可食包装纸原料玉米粉作为检测对象,为提高酶联免疫法检测结果的准确性,通过添加回收实验,以最高的回收率为判断标准对应得到最优的前处理条件;先通过标准曲线的封闭温度和温育时间的优化,再进行玉米赤霉烯酮的前处理方式(包括对提取液浓度、稀释液的pH值、稀释液中有机溶剂的浓度等3个方面进行优化,以添加回收结果作为判断依据)进行测试。同时,将优化后的实验结果组装到胶体金试纸条,并对掺杂玉米赤霉烯酮的玉米粉进行快速检测。结果前处理最适条件,甲醇溶液的体积分数为50%,缓冲液pH值为8.0且含甲醇的体积分数为10%,在该条件下测得的回收率最高。在该优化条件下,组装的胶体金试纸条其检测灵敏度可达0.75ng/mL。结论该检测结果与添加标品所测实验结果基本一致,可以确定该胶体金试纸条是一种快速有效的检测方法。  相似文献   

10.
高效液相色谱法测定鸡蛋中的三聚氰胺   总被引:1,自引:0,他引:1  
建立了鸡蛋中三聚氰胺的高效液相色谱(HPLC)检测方法. 样品使用阳离子交换固相萃取柱净化后, 使用 SB-C18 柱(4.6 mm×150 mm, 5 μm), 在流动相为乙腈 -0.01 mol/L 柠檬酸 +0.01 mol/L 庚烷磺酸钠(pH 值为 3.0)(体积比为 10∶90), 检测波长 240 nm, 流速为 1.0 mL/min, 柱温 40 ℃, 进样量为 20 μL 的色谱条件下测定. 结果表明: 方法的线性范围为 0.5~50 mg/L, 最低检出浓度为 0.15 mg/kg, 定量限为 0.5 mg/kg, 回收率为 101%~115%, 相对标准偏差为 5.50%~8.34%. 具有杂质干扰小、回收率高、重现性好的特点, 可推广应用于鸡蛋中的三聚氰胺的检测.  相似文献   

11.
Chen  Yanni  Liu  Liqiang  Xu  Liguang  Song  Shanshan  Kuang  Hua  Cui  Gang  Xu  Chuanlai 《Nano Research》2017,10(8):2833-2844
A gold immunochromatographic sensor (GICS) was developed for the rapid detection of 26 sulfonamides in honey samples.The sensor was based on a group-specific monoclonal antibody (mAb) that can recognize all 26 sulfonamides.Three haptens (hapten 1 with a thiazole ring,hapten 2 with a benzene ring,and hapten 3 with a straight carbon chain) were used for antigen preparation.With hybridoma technology,a group-specific mAb was screened with a 50% maximal inhibitory concentration (IC50) against sulfathizole (STZ) and the other 25 analogues ranging from 0.08 to 90.18 ng/mL.Mono-dispersed gold nanoparticles were conjugated with the mAb to develop the lateral immunochromatographic strip.A labeled antibody concentration of 0.1 μg/mL and a coating antigen concentration of 0.2 μg/mL in the test line were chosen for strip preparation.Under optimized conditions,the visual limits of detection (vLOD) for the concentrations of STZ,sulfamethoxazole,sulfamethizole,sulfadiazine,sulfamerazine,sulfadimethoxine,sulfamonomethoxine,sulfameter,sulfamethoxypyridazine,and sulfachloropyridazine were 5,0.25,0.25,10,5,10,25,2.5,5,0.25,and 10 μg/kg,respectively.Scanner analysis in honey samples revealed good performance for detection of the 26 sulfonamides.Commercial honey samples were tested with the sensor and positive results were confirmed with high-performance liquid chromatography.The proposed strip sensor provides a convenient method for the rapid and reliable determination of sulfonamides pollutants in honey samples.  相似文献   

12.
Plastic ELISA-on-a-chip based on sequential cross-flow chromatography   总被引:4,自引:0,他引:4  
A plastic chip that can perform immunoassays using an enzyme as signal generator, i.e., ELISA-on-a-chip, was developed by incorporating an immunostrip into channels etched on the surfaces of the chip. To utilize an analytical concept of cross-flow chromatography, the chip consisted of two cross-flow channels in the horizontal and vertical directions. In the vertical channel, we placed a 2-mm-wide immunostrip for cardiac troponin I (cTnI), which was identical to a conventional rapid test kit except for the utilization of an enzyme, horseradish peroxidase (HRP), as tracer. An enzyme substrate supply channel and a horizontal flow absorption pad compartment were transversely arranged on each lateral side of the signal generation pad of the strip, respectively. Upon application of a sample containing cTnI, it migrated vertically through the membrane strip by capillary action, and antigen-antibody binding occurred. After 15 min, the horizontal flow was initiated by the addition of a chromogenic substrate solution for HRP into the supply channel and by partial superimposition of the horizontal flow absorption pad onto the signal generation pad. A color signal proportional to the analyte concentration was produced on this pad, measured after 5 min as optical densities using a digital camera-based detector, and quantified by integration of the densities under the peak after normalization. Its calibration curve indicated that the detection limit of the chip was approximately 0.1 ng/mL and its quantification limit was 0.25 ng/mL. In measuring blindly prepared samples, the chip performance correlated with that of a reference system, Beckman Coulter Access, within 2.5-fold discrepancy at the detection limit.  相似文献   

13.
太赫兹时域谱技术快速定性检测奶粉中的三聚氰胺   总被引:5,自引:1,他引:4  
采用太赫兹时域谱(THz-TDS)技术测量了奶粉中三聚氰胺在0.2~1.8 THz频段的吸收谱和折射率谱,同时运用密度泛函理论(DFT)计算了三聚氰胺在太赫兹波段的振动频率,并据此对实验光谱吸收峰进行了指认,计算结果与实验光谱特征峰很好吻合.表明太赫兹时域谱技术对快速测定识别奶粉中三聚氰胺成分具有良好前景.  相似文献   

14.
The illegal adulteration of milk with melamine in 2008 in China led to adverse kidney and urinary tract effects in hundreds of thousands of children and the reported deaths of six. The milk had been deliberately adulterated to elevate the apparent protein content, and subsequently melamine was detected in many milk-related products which had been exported. This led to the banning of imports of milk and milk products from China intended for the nutritional use of children and to the implementation of analytical methods to test products containing milk products. An optical biosensor inhibition immunoassay has been developed as a rapid and robust method for the analysis of infant formula and infant liquid milk samples. A compound with a chemical structure similar to that of melamine was employed as a hapten to raise a polyclonal antibody and as the immobilized antigen on the surface of a biosensor chip. The sensitivity of the assay, given as an IC(50), was calculated to be 67.9 ng mL(-1) in buffer. The antibody did not cross-react with any of the byproducts of melamine manufacture; however, significant cross-reactivity was observed with the insecticide cyromazine of which melamine is a metabolite. When sample matrix was applied to the assay, a limit of detection of <0.5 μg mL(-1) was determined in both infant formula and infant liquid milk. The development of the immunoassay and validation data for the detection of melamine is presented together with the results obtained following the analysis of melamine-contaminated milk powder.  相似文献   

15.
Liu BH  Tsao ZJ  Wang JJ  Yu FY 《Analytical chemistry》2008,80(18):7029-7035
A monoclonal antibody (mAb) specific to ochratoxin A (OTA) was produced from a stable hybridoma cell line, 9C9H9, generated by the fusion of P3/NS1/1-AG4-1 myeloma cells with spleen cells isolated from a BALB/c mouse immunized with OTA-keyhole limpet hemocyanin. The 9C9H9 mAb belongs to the immunoglobulin G1 (kappa chain) isotype. A competitive direct enzyme-linked immunosorbent assay (cdELISA) and a competitive indirect ELISA were established for antibody characterization. The concentrations causing 50% inhibition of binding of OTA-horseradish peroxidase to the antibody by OTA, OTB, and OTC were found to be 0.32, 0.17, and 0.28 ng/mL, respectively, in the cdELISA. A sensitive and rapid mAb-based gold nanoparticle immunochromatographic strip was also developed using this mAb. This strip has a detection limit of 5 ng/mL for OTA and can be completed in 10 min. Analysis of OTA in coffee samples revealed that data obtained from immunochromatographic strip were in a good agreement with those obtained from cdELISA. The mAb-based cdELISA and immunochromatographic strip assay established in this study were sensitive and accurate for rapid screening of OTA in coffee samples.  相似文献   

16.
Liu G  Lin YY  Wang J  Wu H  Wai CM  Lin Y 《Analytical chemistry》2007,79(20):7644-7653
We describe a disposable electrochemical immunosensor diagnosis device that integrates the immunochromatographic strip technique with an electrochemical immunoassay and exploits quantum dot (QD, CdS@ZnS) as labels for amplifying signal output. The device takes advantage of the speed and low cost of the conventional immunochromatographic strip test and the high sensitivity of the nanoparticle-based electrochemical immunoassay. A sandwich immunoreaction was performed on the immunochromatographic strip, and the captured QD labels in the test zone were determined by highly sensitive stripping voltammetric measurement of the dissolved metallic component (cadmium) with a disposable screen-printed electrode, which is embedded underneath the membrane on the test zone. The new device coupled with a portable electrochemical analyzer shows great promise for in-field and point-of-care quantitative testing of disease-related protein biomarkers. The parameters (e.g., voltammetric measurement of QD labels, antibody immobilization, the loading amount of QD-antibody, and the immunoreaction time) that govern the sensitivity and reproducibility of the device were optimized with IgG model analyte. The voltammetric response of the optimized device is highly linear over the range of 0.1-10 ng mL(-1) IgG, and the limit of detection is estimated to be 30 pg mL(-1) in association with a 7-min immunoreaction time. The detection limit was improved to 10 pg mL(-1) using a 20-min immunoreaction time. The device has been successfully applied for the detection of prostate-specific antigen (PSA) in human serum sample with a detection limit of 20 pg mL(-1). The results were validated by using the commercial PSA enzyme-linked immunosorbent assay kit and showed high consistency. The new disposable electrochemical diagnosis device thus provides a rapid, clinically accurate, and quantitative tool for protein biomarker detection.  相似文献   

17.
研制基于标准CM05工艺和微加工技术的微型糠化血红蛋白免疫传感器,可用于血液中糖化血红蛋白浓度与血红蛋白浓度的快速检测.该微传感器包括含有信号读出电路的传感集成芯片和一次性测试试条,实现了对4—24μg/mL糖化血红蛋白和60~180μg/mL血红蛋白的检测,响应时间小于3min,试剂用量10μL,具有简便、快速、试剂用量少等优点.  相似文献   

18.
The oral patch of diazepam (DZ) was developed to achieve a rapid absorption of DZ for the emergency treatment of epileptic seizure or anxiety disorder. The patch was composed of the outer mucoadhesive Carbopol 934 region, central drug region, and Tegaderm backing film. DZ (3 mg) was dissolved in propylene glycol (PG) alone or PG containing oleic acid (OA) at 5.6% (w/w), and used as the drug region. The patches with and without OA were attached to the mucosa of cheek in rats. The patch with OA exhibited the plasma level of more than 200 ng/mL at 10 min after administration, then the plasma concentration decreased gradually. The patch without OA displayed a plasma level of less than 30 ng/mL during 40 min after administration. To the contrary, in the in vitro drug permeation using a cellulose membrane, the patch without OA showed a three times faster permeation rate than the patch with OA, suggesting that the direct action of OA to mucosa might be associated with absorption enhancement. It was demonstrated that the patch with OA showed a good adhesion to oral mucosa and worked efficiently for rapid absorption of DZ.  相似文献   

19.
The oral patch of diazepam (DZ) was developed to achieve a rapid absorption of DZ for the emergency treatment of epileptic seizure or anxiety disorder. The patch was composed of the outer mucoadhesive Carbopol 934 region, central drug region, and Tegaderm backing film. DZ (3 mg) was dissolved in propylene glycol (PG) alone or PG containing oleic acid (OA) at 5.6% (w/w), and used as the drug region. The patches with and without OA were attached to the mucosa of cheek in rats. The patch with OA exhibited the plasma level of more than 200 ng/mL at 10 min after administration, then the plasma concentration decreased gradually. The patch without OA displayed a plasma level of less than 30 ng/mL during 40 min after administration. To the contrary, in the in vitro drug permeation using a cellulose membrane, the patch without OA showed a three times faster permeation rate than the patch with OA, suggesting that the direct action of OA to mucosa might be associated with absorption enhancement. It was demonstrated that the patch with OA showed a good adhesion to oral mucosa and worked efficiently for rapid absorption of DZ.  相似文献   

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