TALANTA
·
2024
·
IF 5.6
Feifan Qi,Mengdie Wu,Simin Liu,Wendi Mu,Chunyan Wu,Xinshui Ren,Chuang Rui,Fangfang Wu,Dong Chang,Hongzhi Pan
Carbohydrate antigen 199 (CA199) is the most sensitive marker reported for pancreatic cancer, and it is a difficult task to develop a highly sensitive assay for CA199. During the experiment, a ratiometric electrochemical immunosensor for quantitative analysis of CA199 was prepared for NiCo@Fc-MWCNTs-LDH as the electrode sensing surface and 3D-rGOF@Ag/Au as the label of Ab 2 . NiCo@Fc-MWCNTs-LDH not only provide the required signal for the immunosensor, but also have a layered structure to obtain a large specific surface area, which can provide more sites for the placement of biological molecules. rGOF has the advantages of large specific surface area and high porosity, which can adsorb Ag electrochemical probe through redox reaction. The modification of gold nanoparticles can not only enhance the electrical conductivity of nano-composites, but also immobilize more biomolecules to improve the sensitivity of electrochemical sensors. With the beefing up of CA199 concentration, the oxidation peak current of Ag increases and the oxidation peak current of Fc-COOH decreases. The ratio (y = I Ag /I Fc-COOH ) of two different signals was linear with the logarithm of CA199 concentration in a certain value range. Under optimal conditions, the immunosensor showed excellent performance in the concentration range of 0.0001 U/mL to 10 U/mL, and the detection limit was 5.55 × 10 −4 U/mL. The strategy could clearly discriminate between matched and mismatched targets, demonstrating high specifificity. This approach further detects CA199 in human plasma to differentiate pancreatic cancer patients from healthy individuals with high accuracy. This method also provided a new idea for the ultrasensitive quantitative detection of other biomarkers.
研究领域:
生物医学工程
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肿瘤标志物检测
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纳米材料科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL LETTERS
·
2023
·
IF 2
Hongdan Wang,Wei Yuan,Liqiu Zhang,Baogang Xie,Qiong Cheng,Ningwen Zhang
To precisely detect CA199 antigen, a novel electrochemical immunosensor based on horseradish peroxidase (HRP) and glucose oxidase (GOD) double enzyme system was prepared. Thiol was adsorbed on the surface of nano-octahedral gold through Au-S self-assembly; the second antibody was labeled by glutaraldehyde ligase as a signal amplification reagent. Amino magnetic microspheres were used to connect GOD and bovine serum albumin (BSA) through glutaraldehyde. The biosensor displayed low detection limits of 0.2 U/mL and wide linear range (0.5–200 U/mL). This novel immunosensor improves the sensitivity of current detection, showing promising application prospects in the clinical immunoassay detection of CA199.
研究领域:
生物医学工程
·
临床检验
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产品关联
DOI
高影响因子
Experimental and Therapeutic Medicine
·
2023
·Vol. 25
·期 2
·1-10
·
IF 2.7
Qing Chen,Shaojin Zhu,Nanlin Jiao,Ziyu Zhang,Guangjian Gao,Wenqiang Zheng,Gang Feng,Wenzheng Han
The early diagnosis of lung cancer is closely associated with the decline of mortality. A panel consisting of seven lung cancer‑related autoantibodies (7‑AABs) has been shown to be a reliable and specific indicator for the early detection of lung cancer, with a specificity of ~90% and a positive predictive value of ~85%. However, its low sensitivity and negative predictive value limit its wide application. To improve its diagnostic value, the diagnostic efficiencies of 7‑AABs in combination with non‑specific tumor markers were retrospectively investigated for the detection of early‑stage lung cancer. A total of 217 patients with small lung nodules who presented with ground‑glass opacity or solid nodules as well as 30 healthy controls were studied. The concentrations of 7‑AABs and heat shock protein 90a (HSP90a) were assessed using ELISA. Automated flow fluorescence immune analysis was used for the assessment of CEA, CYFRA21‑1, CA199 and CA125 levels. The results showed that 7‑AABs + HSP90a possessed a remarkably improved diagnostic efficiency for patients with small pulmonary nodules or for patients with lung nodules of different types, which suggested that 7‑AABs in combination with HSP90a could have a high clinical value for the improvement of the diagnostic efficiency of early‑stage lung cancer.
研究领域:
肿瘤学
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医学诊断学
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免疫学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 17
·9991
·
IF 6.208
Xueshima Jiao,Tao Peng,Zhanwei Liang,Yalin Hu,Bo Meng,Yang Zhao,Jie Xie,Xiaoyun Gong,You Jiang,Xiang Fang,Xiaoping Yu,Xinhua Dai
Carbohydrate antigen 199 (CA199) is a serum biomarker which has certain value and significance in the diagnosis, prognosis, treatment, and postoperative monitoring of cancer. In this study, a lateral flow immunoassay based on europium (III) polystyrene time-resolved fluorescence microspheres (TRFM-based LFIA), integrated with a portable fluorescence reader, has been successfully establish for rapid and quantitative analysis of CA199 in human serum. Briefly, time-resolved fluorescence microspheres (TRFMs) were conjugated with antibody I (Ab1) against CA199 as detection probes, and antibody II (Ab2) was coated as capture element, and a “TRFMs-Ab1-CA199-Ab2” sandwich format would form when CA199 was detected by the TRFM-based LFIA. Under the optimal parameters, the detection limit of the TRFM-based LFIA for visible quantitation with the help of an ultraviolet light was 4.125 U/mL, which was four times lower than that of LFIA based on gold nanoparticles. Additionally, the fluorescence ratio is well linearly correlated with the CA199 concentration (0.00–66.0 U/mL) and logarithmic concentration (66.0–264.0 U/mL) for quantitative detection. Serum samples from 10 healthy people and 10 liver cancer patients were tested to confirm the performances of the point-of-care application of the TRFM-based LFIA, 20.0 U/mL of CA199 in human serum was defined as the threshold for distinguishing healthy people from liver cancer patients with an accuracy of about 60%. The establishment of TRFM-based LFIA will provide a sensitive, convenient, and efficient technical support for rapid screening of CA199 in cancer diagnosis and prognosis.Keywords:time-resolved fluorescent microspheres;lateral flow immunoassay;carbohydrate antigen 199;biomarker;cancer
研究领域:
医学诊断
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生物技术
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肿瘤学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）