Convenient,rapid,and accurate detection of cardiac troponin I(cTnI)is crucial in early diagnosis of acute myocardial infarction(AMI).A paper-based electrochemical immunosensor is a promising choice in this field,becau...Convenient,rapid,and accurate detection of cardiac troponin I(cTnI)is crucial in early diagnosis of acute myocardial infarction(AMI).A paper-based electrochemical immunosensor is a promising choice in this field,because of the flexibility,porosity,and cost-efficacy of the paper.However,paper is poor in electronic conductivity and surface functionality.Herein,we report a paper-based electrochemical immunosensor for the label-free detection of cTnI with the working electrode modified by MXene(Ti_(3)C_(2))nanosheets.In order to immobilize the bio-receptor(anti-cTnI)on the MXene-modified working electrode,the MXene nanosheets were functionalized by aminosilane,and the functionalized MXene was immobilized onto the surface of the working electrode through Nafion.The large surface area of the MXene nanosheets facilitates the immobilization of antibodies,and the excellent conductivity facilitates the electron transfer between the electrochemical species and the underlying electrode surface.As a result,the paper-based immunosensor could detect cTnI within a wide range of 5-100 ng/mL with a detection limit of 0.58 ng/mL.The immunosensor also shows outstanding selectivity and good repeatability.Our MXene-modified paper-based electrochemical immunosensor enables fast and sensitive detection of cTnI,which may be used in real-time and cost-efficient monitoring of AMI diseases in clinics.展开更多
Acute myocardial infarction(AMI)is a major health problem leading to high rates of mortality and morbidity.Biomarker cardiac troponin I(cTnI)has shown high sensitivity and specificity towards AMI detection,and has bee...Acute myocardial infarction(AMI)is a major health problem leading to high rates of mortality and morbidity.Biomarker cardiac troponin I(cTnI)has shown high sensitivity and specificity towards AMI detection,and has been regarded as"gold standard".An ultrasensitive method to detectcTnI with low concentration in human fluid is essential.In this paper,we developed an aptamer-based assay coupled with rolling circle amplification(RCA)and molecular beacon probe for sensitive detection ofcTnI.In this strategy,aptamer acts as a bridge to communicate between oligonucleotides andcTnI.RCA reaction produces a single-stranded tandem repeated copy of the circular template,which are recognized by fluorescence molecular beacon probe.With this strategy,highly sensitive and specific detection of cTnI was realized with the lowest detectable concentration of 7.24 pg/m L.The developed aptamer-RCA assay can be a promising tool in clinical samples analysis.The assay can also analyze other disease-related biomarkers by replacing the aptamer.展开更多
目的研究急诊老年严重脓毒症及脓毒性休克患者血浆心肌肌钙蛋白I(cTnI)、肌酸激酶同工酶(CK-MB)及动脉血乳酸水平的变化及其对预后的评估。方法收集首都医科大学宣武医院急诊老年严重脓毒症和脓毒性休克患者98例,就诊后予cTnI、CK-MB、...目的研究急诊老年严重脓毒症及脓毒性休克患者血浆心肌肌钙蛋白I(cTnI)、肌酸激酶同工酶(CK-MB)及动脉血乳酸水平的变化及其对预后的评估。方法收集首都医科大学宣武医院急诊老年严重脓毒症和脓毒性休克患者98例,就诊后予cTnI、CK-MB、乳酸等检查,并行APACHEⅡ评分(Acute Physiology and Chronic Health EvaluationⅡ)和SOFA(Sequential Organ Failure Assessment,SOFA)评分,早期目标导向性治疗(EGDT)后6h复测血乳酸水平,随访28天,依据患者的预后分为存活组和死亡组,分别比较存活组和死亡组cTnI,CK-MB,乳酸,APACHEⅡ评分及SOFA评分区别;比较脓毒性休克和严重脓毒症组的cTnI,CK-MB,乳酸,APACHEⅡ评分及SOFA评分的区别;并进行cTnI,CK-MB,乳酸与APACHEⅡ评分、SOFA评分的相关性分析;通过分析ROC曲线下面积(AUC)确定cTnI、CK-MB、乳酸对老年严重脓毒症和脓毒性休克患者预后的评估价值。结果脓毒性休克组患者cTnI、CKMB、乳酸、APACHEII评分和SOFA评分大于严重脓毒症组;死亡组cTnI、CK-MB、和乳酸均大于存活组(P<0.05);cTnI、CK-MB、乳酸水平与APACHElI评分、SOFA评分具有显著相关性(相关系数r=0.675-0.899,P<0.05),cTnI、CK-MB、乳酸预测死亡ROC曲线下面积分别为0.846、0.949、0.809、0.829,通过logistic回归所得联合预测概率ROC曲线下面积为0.979(P<0.05)。结论急诊脓毒性休克以及老年严重脓毒症患者采用cTnI、CK-MB和动脉血乳酸联合检测,对其病情和预后有着非常重要的评估价值,cTnI、CK-MB、和乳酸水平愈高提示患者预后愈差。展开更多
基金financially supported by the National Key R&D Program of China(2017YFA0204700)the Joint Research Funds of Department of Science&Technology of Shaanxi Province and Northwestern Polytechnical University(2020GXLH-Z-021)+1 种基金the China-Sweden Joint Mobility Project(51811530018)the Fundamental Research Funds for the Central Universities.
文摘Convenient,rapid,and accurate detection of cardiac troponin I(cTnI)is crucial in early diagnosis of acute myocardial infarction(AMI).A paper-based electrochemical immunosensor is a promising choice in this field,because of the flexibility,porosity,and cost-efficacy of the paper.However,paper is poor in electronic conductivity and surface functionality.Herein,we report a paper-based electrochemical immunosensor for the label-free detection of cTnI with the working electrode modified by MXene(Ti_(3)C_(2))nanosheets.In order to immobilize the bio-receptor(anti-cTnI)on the MXene-modified working electrode,the MXene nanosheets were functionalized by aminosilane,and the functionalized MXene was immobilized onto the surface of the working electrode through Nafion.The large surface area of the MXene nanosheets facilitates the immobilization of antibodies,and the excellent conductivity facilitates the electron transfer between the electrochemical species and the underlying electrode surface.As a result,the paper-based immunosensor could detect cTnI within a wide range of 5-100 ng/mL with a detection limit of 0.58 ng/mL.The immunosensor also shows outstanding selectivity and good repeatability.Our MXene-modified paper-based electrochemical immunosensor enables fast and sensitive detection of cTnI,which may be used in real-time and cost-efficient monitoring of AMI diseases in clinics.
基金Supported by the National Key Scientific Instrument and Equipment Development Projects of China(2012YQ04014005)。
文摘Acute myocardial infarction(AMI)is a major health problem leading to high rates of mortality and morbidity.Biomarker cardiac troponin I(cTnI)has shown high sensitivity and specificity towards AMI detection,and has been regarded as"gold standard".An ultrasensitive method to detectcTnI with low concentration in human fluid is essential.In this paper,we developed an aptamer-based assay coupled with rolling circle amplification(RCA)and molecular beacon probe for sensitive detection ofcTnI.In this strategy,aptamer acts as a bridge to communicate between oligonucleotides andcTnI.RCA reaction produces a single-stranded tandem repeated copy of the circular template,which are recognized by fluorescence molecular beacon probe.With this strategy,highly sensitive and specific detection of cTnI was realized with the lowest detectable concentration of 7.24 pg/m L.The developed aptamer-RCA assay can be a promising tool in clinical samples analysis.The assay can also analyze other disease-related biomarkers by replacing the aptamer.
文摘目的研究急诊老年严重脓毒症及脓毒性休克患者血浆心肌肌钙蛋白I(cTnI)、肌酸激酶同工酶(CK-MB)及动脉血乳酸水平的变化及其对预后的评估。方法收集首都医科大学宣武医院急诊老年严重脓毒症和脓毒性休克患者98例,就诊后予cTnI、CK-MB、乳酸等检查,并行APACHEⅡ评分(Acute Physiology and Chronic Health EvaluationⅡ)和SOFA(Sequential Organ Failure Assessment,SOFA)评分,早期目标导向性治疗(EGDT)后6h复测血乳酸水平,随访28天,依据患者的预后分为存活组和死亡组,分别比较存活组和死亡组cTnI,CK-MB,乳酸,APACHEⅡ评分及SOFA评分区别;比较脓毒性休克和严重脓毒症组的cTnI,CK-MB,乳酸,APACHEⅡ评分及SOFA评分的区别;并进行cTnI,CK-MB,乳酸与APACHEⅡ评分、SOFA评分的相关性分析;通过分析ROC曲线下面积(AUC)确定cTnI、CK-MB、乳酸对老年严重脓毒症和脓毒性休克患者预后的评估价值。结果脓毒性休克组患者cTnI、CKMB、乳酸、APACHEII评分和SOFA评分大于严重脓毒症组;死亡组cTnI、CK-MB、和乳酸均大于存活组(P<0.05);cTnI、CK-MB、乳酸水平与APACHElI评分、SOFA评分具有显著相关性(相关系数r=0.675-0.899,P<0.05),cTnI、CK-MB、乳酸预测死亡ROC曲线下面积分别为0.846、0.949、0.809、0.829,通过logistic回归所得联合预测概率ROC曲线下面积为0.979(P<0.05)。结论急诊脓毒性休克以及老年严重脓毒症患者采用cTnI、CK-MB和动脉血乳酸联合检测,对其病情和预后有着非常重要的评估价值,cTnI、CK-MB、和乳酸水平愈高提示患者预后愈差。
