Article(id=1322946771386761424, tenantId=1146029695717560320, journalId=1283840372199657495, issueId=1322945494665797748, articleNumber=null, orderNo=null, doi=10.3724/SP.J.1123.2024.12017, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1734364800000, receivedDateStr=2024-12-17, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793344689460, onlineDateStr=2026-10-30, pubDate=1757260800000, pubDateStr=2025-09-08, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793344689460, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793344689460, creator=13701087609, updateTime=1793344689460, updator=13701087609, issue=Issue{id=1322945494665797748, tenantId=1146029695717560320, journalId=1283840372199657495, year='2025', volume='43', issue='9', pageStart='987', pageEnd='1085', issueExtLink='null', onlineDate='null', pubDate='1757260800000', pubDateStr='2025-09-08', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793344385067, creator='13701087609', updateTime=1793345219786, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322948995802334087, tenantId=1146029695717560320, journalId=1283840372199657495, issueId=1322945494665797748, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322948995802334088, tenantId=1146029695717560320, journalId=1283840372199657495, issueId=1322945494665797748, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1070, endPage=1077, ext={EN=ArticleExt(id=1322946772645052627, articleId=1322946771386761424, tenantId=1146029695717560320, journalId=1283840372199657495, language=EN, title=A protein-specific quantitative detection method based on polyacrylamide gel electrophoresis and online fluorescence imaging, columnId=1284557502633185292, journalTitle=Chinese Journal of Chromatography, columnName=Articles, runingTitle=null, highlight=null, articleAbstract=
Specific protein detection plays a crucial role in biological analysis and clinical diagnostics, serving as an essential tool for disease diagnosis, therapeutic monitoring, and biological research. However, conventional methods such as immunofixation electrophoresis (IFE) and western blotting (WB) suffer from complex workflows, time-consuming operations, and limited quantification capabilities owing to intricate staining and de-staining procedures. In addition, these traditional immunological detection methods require extensive manual handling and specialized expertise, while low levels of automation restrict their applicability to high-throughput or large-scale analysis scenarios. Moreover, the multistep nature of these methods increases the risk of experimental errors and compromises quantification accuracy.Herein, we present a quantitative protein immune polyacrylamide gel electrophoresis (PAGE) detection method that combines immune-recognition principles with online fluorescence imaging technology, thereby offering a rapid and specific approach for quantifying target proteins. The developed method exploits the specificity of fluorescently labeled antibodies and the separation capability of PAGE, with formaldehyde crosslinking used to stabilize antigen-antibody complexes under the denaturing conditions of electrophoresis, thereby ensuring reliable quantification. The entire experimental workflow can be completed within 1.5 h and consists of three main steps. Firstly, the target protein is incubated with fluorescently labeled antibodies at room temperature for 0.5 h to form immune complexes, after which they are crosslinked using formaldehyde. The cross-linked samples are then loaded onto polyacrylamide gels and separated under optimized electrophoresis conditions (120 V, 15 min; 150 V, 15 min; 200 V, 15 min). Electrophoretic separation is finally monitored in real-time using an online fluorescence imaging system, which enables direct visualization of protein migration and eliminates the need for post-separation processing. Three distinct bands are observed on the precast gel following immune PAGE separation: the immune complexes at the uppermost position, the free fluorescent antibodies in the middle, and other proteins at the bottom. ImageJ software is used to analyze the electrophoresis pattern, and quantification is achieved based on the linear relationship between the fluorescence intensity of the free antibody and the mass concentration of the target protein. We systematically validated the performance of the method using human transferrin (TRF) as the model antigen protein and fluorescein-isothiocyanate-labeled (FITC-labeled) anti-TRF IgG antibody (anti-TRF IgG-FITC) as the detection probe, which involved analyzing three key aspects: the necessity of the formaldehyde-crosslinking step for maintaining immune complex stability, antibody recognition specificity in complex samples, and the linear correlation between the fluorescence signal and the mass concentration of the target protein. The method exhibited excellent analytical performance, with a linear range that extended between 5.0 and 200.0 mg/L and a correlation coefficient (R2) of 0.993 0. Triplicate measurements of fluorescence intensity at all mass concentration points revealed a maximum relative standard deviation (RSD) of 1.65%. The limit of detection (LOD) reaches 0.5 mg/L, with recoveries between 98.2% and 105.0%. Repeatability experiments revealed maximum intra- and inter-day RSDs of 1.21% and 1.58%, respectively. Specificity testing confirmed that the developed method accurately quantified TRF without interference from other proteins in complex samples. These results highlight the good accuracy, excellent consistency, high sensitivity, and robust specificity of the developed method, thereby confirming its reliability for use in precise protein-quantification applications. Compared to traditional PAGE methods, the immune PAGE method introduced herein provides the ability to selectively quantify specific target proteins online using real-time fluorescence imaging technology. The method exhibits several notable advantages, including high resolution, a simple workflow, strong specificity, rapid analysis, and good reproducibility. The online fluorescence imaging system eliminates the need for complex gel-dismantling, membrane-transfer, fixation, staining, and de-staining steps while effectively preventing protein band broadening, thereby enabling highly sensitive quantitative analyses with superior resolution. The cost-effectiveness of the developed method is achieved through economical fluorescently labeled antibodies and low sample consumption. Moreover, the fundamental principle of the immune PAGE method suggests that this approach is readily adaptable to the quantification of other proteins through the judicious selection of specific fluorescently labeled antibodies. Consequently, the versatility of the developed method makes it a comprehensive analytical platform suitable for pharmaceutical preparations and clinical diagnostics, in which rapid and accurate protein quantification is essential for decision-making processes. Additionally, this method is an ideal choice for high-throughput applications in both academic research and industrial settings owing to the integration of automated analysis and short operation times. The protein immune PAGE method represents a significant advancement in specific protein quantification methodology with great potential as a promising tool that is expected to be widely adopted in various biological analysis scenarios.
, authors=Rui ZOU, Zixian YU, Zehua GUO, Haozheng DAI, Qiang ZHANG
*, Weiwen LIU, Chengxi CAO
*, authorsList=Rui ZOU, Zixian YU, Zehua GUO, Haozheng DAI, Qiang ZHANG, Weiwen LIU, Chengxi CAO, authorCompany=null, correspAuthors=Qiang ZHANG, Chengxi CAO, authorNote=null, correspAuthorsNote=null, copyrightStatement=
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322946778902954214, articleId=1322946771386761424, tenantId=1146029695717560320, journalId=1283840372199657495, language=CN, title=基于聚丙烯酰胺凝胶电泳结合在线荧光成像的蛋白质特异性定量分析方法, columnId=1284557502792568846, journalTitle=色谱, columnName=研究论文, runingTitle=null, highlight=null, articleAbstract=
蛋白质的特异性检测在生物分析和临床诊断中具有重要意义。现有方法如免疫固定电泳和蛋白质印迹法,需要手工染色和脱色等步骤,操作繁琐,耗时久且定量能力有限。本文结合在线荧光成像技术开发了一种蛋白质免疫聚丙烯酰胺凝胶电泳(PAGE)定量检测方法。该方法首先采用荧光标记抗体结合目标蛋白质,使用甲醛交联免疫复合物后进行电泳和在线成像,最终通过计算凝胶电泳图像中游离抗体的荧光信号强度实现定量分析。整个检测流程可在1.5 h内完成。本文以人转铁蛋白(transferrin,TRF)为模式蛋白进行方法学验证,结果显示该方法的线性范围为5.0~200.0 mg/L,线性相关系数(R2)为0.993 0,制作标准曲线的标准溶液中荧光信号强度的最大相对标准偏差(RSD)为1.65%,检出限为0.5 mg/L,加标回收率为98.2%~105.0%,表明该检测方法具有良好的精密度、灵敏度和准确度。相较于传统的PAGE方法,该方法利用实时荧光成像技术实现了对目标蛋白质的在线定量检测,具有分辨率高、特异性强、操作简便、分析快速以及重现性好等优点。该方法具有普适性,可应用于其他蛋白质的定量检测,在药物制备和临床诊疗等领域具有重要的应用价值。
, authors=邹睿, 吁子贤, 郭泽华, 戴皓正, 张强
*, 刘伟文, 曹成喜
*, authorsList=邹睿, 吁子贤, 郭泽华, 戴皓正, 张强, 刘伟文, 曹成喜, authorCompany=null, correspAuthors=张强, 曹成喜, authorNote=null, correspAuthorsNote=
, copyrightStatement=Copyright © 2025 Editorial office of Chinese Journal of Chromatography
本文是开放获取文章,遵循CC BY 4.0协议
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Schematic illustration of the immune polyacrylamide gel electrophoresis (PAGE) methoda. illustration of immunological binding and formaldehyde crosslinking of immune complex of transferrin (TRF) and fluorescein-isothiocyanate-labeled (FITC-labeled) anti-TRF IgG antibody (anti-TRF IgG-FITC); b. diagram of protein separation by electrophoresis; c. optical path configuration of the online fluorescence imaging system; d. principle of gel fluorescence imaging and quantitative detection of the immune complex and anti-TRF IgG-FITC.
, figureFileSmall=ab+Lb+dbV886u1ZIRndj3A==, figureFileBig=YAK9pWwRMr6FDV1ZPD+mCw==, tableContent=null), ArticleFig(id=1322947918432436706, tenantId=1146029695717560320, journalId=1283840372199657495, articleId=1322946771386761424, language=CN, label=图1, caption=
免疫PAGE定量检测方法的原理示意图, figureFileSmall=ab+Lb+dbV886u1ZIRndj3A==, figureFileBig=YAK9pWwRMr6FDV1ZPD+mCw==, tableContent=null), ArticleFig(id=1322947918600208867, tenantId=1146029695717560320, journalId=1283840372199657495, articleId=1322946771386761424, language=EN, label=Fig. 2, caption=
Comparative analysis of immune complex stability with and without formaldehyde crosslinkinga. fluorescence imaging of immune complexes formed between TRF antigen and anti-TRF IgG-FITC after formaldehyde crosslinking treatment; b. fluorescence imaging of the same immune complexes without formaldehyde crosslinking.
The numbers above each lane indicate TRF mass concentrations (mg/L) in the immune complex samples, and protein relative molecular masses are marked on the left.
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有/无甲醛交联时免疫复合物电泳稳定性的对比, figureFileSmall=blDFzt2K0dqOZTD5XyfT+w==, figureFileBig=2QvJ0y8HukAxhFp3iTCeZQ==, tableContent=null), ArticleFig(id=1322947918767981029, tenantId=1146029695717560320, journalId=1283840372199657495, articleId=1322946771386761424, language=EN, label=Fig. 3, caption=
Bar graph of differential fluorescence signals for specificity validation of protein immune PAGE method, figureFileSmall=DBo+hBiEIAVwZRfwDSFHjg==, figureFileBig=ToJjZaRLtubHZGzPypL28g==, tableContent=null), ArticleFig(id=1322947918885421542, tenantId=1146029695717560320, journalId=1283840372199657495, articleId=1322946771386761424, language=CN, label=图3, caption=
蛋白质免疫PAGE方法特异性验证的荧光信号差值条形图, figureFileSmall=DBo+hBiEIAVwZRfwDSFHjg==, figureFileBig=ToJjZaRLtubHZGzPypL28g==, tableContent=null), ArticleFig(id=1322947918990279143, tenantId=1146029695717560320, journalId=1283840372199657495, articleId=1322946771386761424, language=EN, label=Fig. 4, caption=
Experimental results of analytical performance of the protein immune PAGE method using TRF and anti-TRF IgG-FITC (n=3)a. linear correlation between band grayscale intensity and anti-TRF IgG-FITC mass concentration; b. calibration curve of fluorescence intensity versus TRF mass concentration.
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使用TRF和anti-TRF IgG-FITC验证免疫PAGE方法性能的实验结果(n=3), figureFileSmall=3Ealem2JovFa+lk7wMgfzA==, figureFileBig=KUJRSWM8CTBwxY6f7Fk6XQ==, tableContent=null), ArticleFig(id=1322947919204188649, tenantId=1146029695717560320, journalId=1283840372199657495, articleId=1322946771386761424, language=EN, label=Table 1, caption=
Protein components of samples used in specificity validation
, figureFileSmall=null, figureFileBig=null, tableContent=
| Sample | TRF | BSA | C-PC | Mb | Cyt-C | anti-TRF IgG-FITC |
|---|
| 1 | + | - | - | - | - | + |
| 2 | - | + | - | - | - | + |
| 3 | - | - | + | - | - | + |
| 4 | - | - | - | + | - | + |
| 5 | - | - | - | - | + | + |
| 6 | + | + | + | + | + | + |
| Blank | - | - | - | - | - | + |
), ArticleFig(id=1322947919300657642, tenantId=1146029695717560320, journalId=1283840372199657495, articleId=1322946771386761424, language=CN, label=表1, caption=
特异性验证实验中各样本的蛋白质组分
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| Sample | TRF | BSA | C-PC | Mb | Cyt-C | anti-TRF IgG-FITC |
|---|
| 1 | + | - | - | - | - | + |
| 2 | - | + | - | - | - | + |
| 3 | - | - | + | - | - | + |
| 4 | - | - | - | + | - | + |
| 5 | - | - | - | - | + | + |
| 6 | + | + | + | + | + | + |
| Blank | - | - | - | - | - | + |
), ArticleFig(id=1322947919455846891, tenantId=1146029695717560320, journalId=1283840372199657495, articleId=1322946771386761424, language=EN, label=Table 2, caption=
Comparison of immune PAGE with online imaging with other immunoassay electrophoresis
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| Method | Specificity | Quantification | Online Imaging | Staining Free | Antibody* | Refs. |
|---|
| CBB | no | no | no | no | / | [29,30] |
| IFE | yes | yes | no | no | 1st Ab | [11,15,31,32] |
| WB | yes | no | yes | yes | 1st & 2nd Ab | [12,13,33,34] |
| Our work | yes | yes | yes | yes | 1st Ab-FITC | / |
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蛋白质免疫PAGE定量检测方法与其他免疫学检测方法的对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| Method | Specificity | Quantification | Online Imaging | Staining Free | Antibody* | Refs. |
|---|
| CBB | no | no | no | no | / | [29,30] |
| IFE | yes | yes | no | no | 1st Ab | [11,15,31,32] |
| WB | yes | no | yes | yes | 1st & 2nd Ab | [12,13,33,34] |
| Our work | yes | yes | yes | yes | 1st Ab-FITC | / |
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