This letter reports a chemiluminescene immunoassay method combined with immunomagnetic separation to rapidly detect Cyfra 21-1, in which bio-functionlized magnetic nanocomposites were used as mobile substrate for capturing and isolating the cyfra 21-1 proteins. After the captured Cyfra 21-1 further reacted with horseradish peroxidase-conjugated anti-Cyfra 21-1 antibody to form a sandwich immunocomplex, the chemiluminescence would be produced as a result of addition of the chemiluminescent substrate. A home-made optical biosensor was designed to detect the chemiluminescence instead of other large instruments. There is a good linear response between the chemiluminescence intensity and the concentration of Cyfra 21-1 in the range from 0.2 to 50 ng/mL. The whole detection process including incubation, washing and detection could be performed within 45 min. The proposed method offers a simple, noninvasive and reliable tool for detecting non-small cell lung cancer and has potential application for clinical testing.
To achieve a dopamine(DA)response with high sensitivity and high signal-to-noise ratio(S/N)with a patch-clamp system,polypyrrole/graphene(PPy/GR)nanocomposites were steadily electrodeposited by an electrochemical method on a planar microelectrode array(pMEA)fabricated by a standard micromachining process.The electrodeposition process was carried out by chronopotentimetry measurement scanning from 0.1 to 0.8 C/cm2at the current of 2 mA;0.5 C/cm2was found to be optimal.The pMEA modified by PPy/GR at the 0.5 C/cm2exhibits remarkable properties;for instance,the standard deviation(SD)decreases from 8.4614×10-11to 5.62×10 11A,reduced by 33.52%,and the sensitivity increases from 2566.88 to 76114.65μAmMcm-2,29.65 times higher than the bare Pt(platinum).A good linear relationship between the current and DA concentration in the range of 0.30 to 61.71μm was obtained,with a correlation coefficient of 0.997.The sensor is meaningful for neuroscience research and the treatment of neurological diseases.
WANG LiJIANG TingJunSONG YiLinSHI WenTaoCAI XinXia
A new rapid,specific and sensitive method for assay of recombinant CFP10-ESAT6 amalgamation proteins from Mycobacterium tuberculosis was proposed.The method used streptavidincoated magnetic beads to enrich the specific biotinylated anti-CFP10 antibody,then adopted a sandwich-type enzyme linked immunosorbent assay technology with two kinds of monoclonal antibodies:biotinylated anti-CFP10 antibody and HRP-labeled anti-CFP10 antibody to identify the target CFP10-ESAT6 proteins,and finally detected chemiluminescence intensity by a small home-made optical sensor.It was shown that,the corresponding chemiluminescence intensity had a good logarithmic linear response to the concentration of CFP10-ESAT6 proteins when ranging at 1~1000 ng/mL,and the correlation coefficient is 0.9937.The proposed method could detect the CFP10-ESAT6 proteins with low detection limit(1 ng/mL)and the detection time could be controlled within 45 min.Compared with commonly used detection methods of M.tuberculosis,this method was easy to operate,faster,and of higher sensitivity.The achievement of the quantitative detection of CFP10-ESAT6 proteins has important scientific significance and wide application prospects in tuberculosis control.
YIQING HUANGJINPING LUOMIXIA WANGJUNTAO LIUXINXIA CAI
