Article(id=1321170456489607435, tenantId=1146029695717560320, journalId=1260987677001138203, issueId=1321170163563614210, articleNumber=null, orderNo=null, doi=10.13386/j.issn1002-0306.2025020172, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1740326400000, receivedDateStr=2025-02-24, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1792921182987, onlineDateStr=2026-10-25, pubDate=1769875200000, pubDateStr=2026-02-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792921182987, onlineIssueDateStr=2026-10-25, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792921182986, creator=13701087609, updateTime=1792921182986, updator=13701087609, issue=Issue{id=1321170163563614210, tenantId=1146029695717560320, journalId=1260987677001138203, year='2026', volume='47', issue='3', pageStart='1', pageEnd='497', issueExtLink='null', onlineDate='null', pubDate='1769875200000', pubDateStr='2026-02-01', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792921113148, creator='13701087609', updateTime=1792921113148, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=284, endPage=291, ext={EN=ArticleExt(id=1321170456699322636, articleId=1321170456489607435, tenantId=1146029695717560320, journalId=1260987677001138203, language=EN, title=Efficient Detection of Xanthine Content in Edible Mushrooms Using Electrochemical Sensors Based on g-C3N4, columnId=1261343843585241413, journalTitle=Science and Technology of Food Industry, columnName=Analysis and Determination, runingTitle=null, highlight=null, articleAbstract=

This study aimed to construct a highly sensitive, reliable, and low-cost electrochemical sensor based on graphitic carbon nitride (g-C3N4) modified materials for efficient and convenient detection of purine content in edible mushrooms. The g-C3N4 material was fabricated through a high-temperature calcination method, and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), and differential pulse voltammetry (DPV). The results indicated that the g-C3N4 material exhibited a two-dimensional sheet-like nanostructure, characterized by a high degree of graphitization, abundant N-functional group content, and a specific surface area of 61.35 m2/g. An electrochemical sensor (g-C3N4/GCE) was fabricated by modifying a glassy carbon electrode (GCE) with the composite material. Under optimal conditions (pH5.5, enrichment potential of 0.3 V, and enrichment time of 5 min), the peak current of the sensor demonstrated a favorable linear relationship with the concentration of xanthine. Within the low concentration range of 0.5~5 μmol/L, a linear relationship was established as Ipa=0.310CXA+2.859 (where Ipa represented the peak current and CXA denoted the xanthine concentration), with a coefficient of determination R2=0.990. In the high concentration range of 5~200 μmol/L, the linear relationship was determined to be Ipa=0.051CXA+4.034, with R2=0.997. The minimum detection limit (LOD) was calculated to be 0.28 μmol/L. According to this sensor, the xanthine content in shiitake mushrooms, tea tree mushrooms, and wood ears were 307.50, 229.22, and 47.27 mg/100 g, respectively. Compared with the commonly used high-performance liquid chromatography method, the g-C3N4 electrochemical sensor exhibited good stability, with a relative standard deviation (RSD) of 1.45%~3.69%, and the operation was simple, which could be used for the detection of xanthine in edible mushrooms.

, authors=Zhiyan CHEN1, 2, Zuyun ZHAO3, Yixin CHEN3, Yixuan REN4, Yajun GAO3, *, authorsList=Zhiyan CHEN, Zuyun ZHAO, Yixin CHEN, Yixuan REN, Yajun GAO, authorCompany=null, correspAuthors=Yajun GAO, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright © 2026 Science and Technology of Food Industry. All rights reserved., 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=1321170458637091105, articleId=1321170456489607435, tenantId=1146029695717560320, journalId=1260987677001138203, language=CN, title=基于g-C3N4的电化学传感器高效检测菌菇中黄嘌呤含量, columnId=1261343846139572559, journalTitle=食品工业科技, columnName=分析检测, runingTitle=null, highlight=null, articleAbstract=

本研究旨在构建一种基于石墨相N化碳(g-C3N4)修饰材料的高灵敏度、可靠和低成本的电化学传感器,用于高效检测菌菇中黄嘌呤含量。通过高温煅烧法制备g-C3N4材料,利用扫描电镜(Scanning Electron Microscope,SEM)、透射电镜(Transmission Electron Microscope,TEM)、循环伏安法(Cyclic Voltammetry,CV)和差分脉冲伏安法(Differential Pulse Voltammetry,DPV)等技术进行表征。结果显示,g-C3N4材料呈二维的片状纳米结构,具有较高的石墨化程度和丰富的N官能团含量,比表面积达到了61.35 m2/g。利用复合材料修饰玻碳电极(Glassy Carbon Electrode,GCE)构建电化学传感器g-C3N4/GCE,在最优条件下(pH5.5,富集电位0.3 V,富集时间5 min),传感器的峰电流与黄嘌呤浓度呈现良好的线性关系。在低浓度0.5~5 μmol/L范围内,线性关系为Ipa=0.310CXA+2.859(Ipa为峰电流,CXA为黄嘌呤浓度),决定系数R2=0.990,在高浓度5~200 μmol/L范围内,线性关系为Ipa=0.051CXA+4.034,R2=0.997,最低检测限(LOD)为0.28 μmol/L。使用该传感器测定双孢蘑菇、茶树菇、玉木耳中黄嘌呤含量分别为307.50、229.22、47.27 mg/100 g。相比常用的高效液相色谱法,g-C3N4电化学传感器稳定性好,相对标准偏差(RSD)为1.45%~3.69%,操作简便,能够用于菌菇中黄嘌呤的检测。

, authors=陈志炎1, 2, 赵祖云3, 陈怡鑫3, 任怡璇4, 高亚军3, *, authorsList=陈志炎, 赵祖云, 陈怡鑫, 任怡璇, 高亚军, authorCompany=null, correspAuthors=高亚军, authorNote=

陈志炎(1982−),男,硕士,副教授,研究方向:食品(烹饪)质量与安全控制,E-mail:

, correspAuthorsNote=
高亚军(1984−),男,博士,讲师,研究方向:微生物检测及生物传感的构建与应用,E-mail:。
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postcode=null, companyName=null, departmentName=null, remark=4School of Agronomy, Shandong Agricultural University, Tai'an 271017, China), AuthorCompanyExt(id=1321170459215905069, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, companyId=1321170459199127851, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=4山东农业大学农学院,山东泰安 271017)])], figs=[ArticleFig(id=1321170461279502672, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.1, caption=SEM (A) and TEM (B) images of the g-C3N4, figureFileSmall=ukGpC3hO7ECSAShwiGjVxQ==, figureFileBig=RHMxwI0hPQGfk9ND9gQrzg==, tableContent=null), ArticleFig(id=1321170461346611537, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图1, caption=g-C3N4材料的SEM(A)和TEM(B)图像, figureFileSmall=ukGpC3hO7ECSAShwiGjVxQ==, figureFileBig=RHMxwI0hPQGfk9ND9gQrzg==, tableContent=null), ArticleFig(id=1321170461589881170, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.2, caption=Raman spectra of g-C3N4, figureFileSmall=t9thiIDiC4oDFjkCjr1NrA==, figureFileBig=2e8yXRBOMuli6oo268uD2g==, tableContent=null), ArticleFig(id=1321170461652795731, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图2, caption=g-C3N4的拉曼光谱, figureFileSmall=t9thiIDiC4oDFjkCjr1NrA==, figureFileBig=2e8yXRBOMuli6oo268uD2g==, tableContent=null), ArticleFig(id=1321170461719904596, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.3, caption=XPS survey spectrums (A), high resolution XPS spectra of N1s (B), nitrogen adsorption/desorption isotherms (C), pore size distribution (D) of g-C3N4, figureFileSmall=/xvuA1PssXlz1L9h0W5B1w==, figureFileBig=ZtLHLflgD0sNW0fpPLiVkA==, tableContent=null), ArticleFig(id=1321170461803790677, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图3, caption=g-C3N4的XPS全光谱(A)、N1s光谱(B)、N2吸附/脱附等温线(C)、孔径分布图(D)

注:C图中左侧/下部曲线(相对压力升高过程)为吸附线,右侧/上部曲线(相对压力下降过程)为脱附线。

, figureFileSmall=/xvuA1PssXlz1L9h0W5B1w==, figureFileBig=ZtLHLflgD0sNW0fpPLiVkA==, tableContent=null), ArticleFig(id=1321170461900259670, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.4, caption=CV (A) and EIS (B) of GCE, g-C3N4/GCE, figureFileSmall=xeaatSO3pHQU2dp4oDlkEg==, figureFileBig=neheOsOGBQXdhfmDbdwdxA==, tableContent=null), ArticleFig(id=1321170462005117271, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图4, caption=GCE、g-C3N4/GCE的CV图(A)和EIS图(B), figureFileSmall=xeaatSO3pHQU2dp4oDlkEg==, figureFileBig=neheOsOGBQXdhfmDbdwdxA==, tableContent=null), ArticleFig(id=1321170462063837528, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.5, caption=DPV of g-C3N4/GCE for the detection of xanthine, figureFileSmall=4buUiZlYmqUcHedpbdd9Nw==, figureFileBig=jSJDIOheGu8MUL4SvJ6h7Q==, tableContent=null), ArticleFig(id=1321170462130946393, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图5, caption=g-C3N4/GCE检测黄嘌呤的DPV图, figureFileSmall=4buUiZlYmqUcHedpbdd9Nw==, figureFileBig=jSJDIOheGu8MUL4SvJ6h7Q==, tableContent=null), ArticleFig(id=1321170462198055258, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.6, caption=Effect of pH on oxidation peak potential (A) and current (B), figureFileSmall=gDJttOFxrkvIcYC3FlLRyw==, figureFileBig=XkwbxiQyeNIOoKE3EkVmEA==, tableContent=null), ArticleFig(id=1321170462265164123, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图6, caption=pH的对氧化峰电位(A)和电流(B)的影响, figureFileSmall=gDJttOFxrkvIcYC3FlLRyw==, figureFileBig=XkwbxiQyeNIOoKE3EkVmEA==, tableContent=null), ArticleFig(id=1321170462336467292, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.7, caption=Effect of enrichment potential (A) and enrichment time (B) on electric current, figureFileSmall=yA89Z5Git4wWck2guC/RuQ==, figureFileBig=bxTp+V5/pDx8nHD31hoTGg==, tableContent=null), ArticleFig(id=1321170462420353373, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图7, caption=富集电位(A)和富集时间(B)对电流的影响, figureFileSmall=yA89Z5Git4wWck2guC/RuQ==, figureFileBig=bxTp+V5/pDx8nHD31hoTGg==, tableContent=null), ArticleFig(id=1321170462500045150, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.8, caption=Quantitative detection of xanthine by g-C3N4/GCE assay, figureFileSmall=GiUgXdtLqZph3R0lPT/Tjw==, figureFileBig=/7PeRkTluINi25DHYwOEfg==, tableContent=null), ArticleFig(id=1321170462558765407, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图8, caption=g-C3N4/GCE检测方法对黄嘌呤的定量检测

注:(A)电化学传感器对不同浓度黄嘌呤的DPV响应曲线;(B)氧化峰电流与黄嘌呤浓度之间的线性关系。

, figureFileSmall=GiUgXdtLqZph3R0lPT/Tjw==, figureFileBig=/7PeRkTluINi25DHYwOEfg==, tableContent=null), ArticleFig(id=1321170462621679968, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.9, caption=Reproducibility (A) and stability (B) of the sensor, figureFileSmall=6gG90zYk99TGmCNfMvXoPA==, figureFileBig=YnzsNI44zPjz5vdWupIVmA==, tableContent=null), ArticleFig(id=1321170462713954657, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图9, caption=传感器的重现性(A)和稳定性(B)

注:曲线1~7为同一条件下对黄嘌呤电流响应的测定次数。

, figureFileSmall=6gG90zYk99TGmCNfMvXoPA==, figureFileBig=YnzsNI44zPjz5vdWupIVmA==, tableContent=null), ArticleFig(id=1321170462772674914, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Fig.10, caption=Current response values of sensors for the determination of xanthine and its interferents, figureFileSmall=vBGCHix00IuyxJsB6P99iA==, figureFileBig=H+laZ1Q6epwpdoFNSd3wng==, tableContent=null), ArticleFig(id=1321170462835589475, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=图10, caption=传感器对黄嘌呤及其干扰物测定的电流响应值, figureFileSmall=vBGCHix00IuyxJsB6P99iA==, figureFileBig=H+laZ1Q6epwpdoFNSd3wng==, tableContent=null), ArticleFig(id=1321170462902698340, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=EN, label=Table 1, caption=

Comparison results of g-C3N4 sensors and HPLC method

, figureFileSmall=null, figureFileBig=null, tableContent=
样品加标量
(μmol/L)
g-C3N4传感器法HPLC法
回收率
(%)
RSD
(%)
样品中
黄嘌呤
含量
(mg/100 g)
回收率
(%)
RSD
(%)
样品中
黄嘌呤
含量
(mg/100 g)
双孢蘑菇40102.021.45307.5088.351.15286.3
8097.282.98101.422.36
120100.932.76100.402.13
茶树菇40103.783.21229.2294.742.17208.9
80101.382.5495.232.63
120101.233.16104.273.12
玉木耳40102.631.6947.2792.971.0344.2
80100.762.87100.282.93
120100.933.69110.603.17
), ArticleFig(id=1321170462969807205, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1321170456489607435, language=CN, label=表1, caption=

g-C3N4传感器与HPLC法的对比结果

, figureFileSmall=null, figureFileBig=null, tableContent=
样品加标量
(μmol/L)
g-C3N4传感器法HPLC法
回收率
(%)
RSD
(%)
样品中
黄嘌呤
含量
(mg/100 g)
回收率
(%)
RSD
(%)
样品中
黄嘌呤
含量
(mg/100 g)
双孢蘑菇40102.021.45307.5088.351.15286.3
8097.282.98101.422.36
120100.932.76100.402.13
茶树菇40103.783.21229.2294.742.17208.9
80101.382.5495.232.63
120101.233.16104.273.12
玉木耳40102.631.6947.2792.971.0344.2
80100.762.87100.282.93
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基于g-C3N4的电化学传感器高效检测菌菇中黄嘌呤含量
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陈志炎 1, 2 , 赵祖云 3 , 陈怡鑫 3 , 任怡璇 4 , 高亚军 3, *
食品工业科技 | 分析检测 2026,47(3): 284-291
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食品工业科技 |分析检测 2026 , 47 (3) : 284 -291
基于g-C3N4的电化学传感器高效检测菌菇中黄嘌呤含量
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陈志炎1, 2 , 赵祖云3, 陈怡鑫3, 任怡璇4, 高亚军3, *
作者信息
  • 1扬州大学旅游烹饪学院,江苏扬州 225127
  • 2中餐非遗技艺传承文化和旅游部重点实验室,江苏扬州 225127
  • 3扬州大学食品科学与工程学院,江苏扬州 225127
  • 4山东农业大学农学院,山东泰安 271017
通讯作者:
高亚军(1984−),男,博士,讲师,研究方向:微生物检测及生物传感的构建与应用,E-mail:。
作者简介:

陈志炎(1982−),男,硕士,副教授,研究方向:食品(烹饪)质量与安全控制,E-mail:

Efficient Detection of Xanthine Content in Edible Mushrooms Using Electrochemical Sensors Based on g-C3N4
Zhiyan CHEN1, 2 , Zuyun ZHAO3, Yixin CHEN3, Yixuan REN4, Yajun GAO3, *
Affiliations
  • 1School of Tourism and Culinary Science, Yangzhou University, Yangzhou 225127, China
  • 2Key Laboratory of Chinese Cuisine Intangible Cultural Heritage Technology Inheritance, Ministry of Culture and Tourism, Yangzhou 225127, China
  • 3School of Food Science and Technology, Yangzhou University, Yangzhou 225127, China
  • 4School of Agronomy, Shandong Agricultural University, Tai'an 271017, China
出版时间: 2026-02-01 doi: 10.13386/j.issn1002-0306.2025020172
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本研究旨在构建一种基于石墨相N化碳(g-C3N4)修饰材料的高灵敏度、可靠和低成本的电化学传感器,用于高效检测菌菇中黄嘌呤含量。通过高温煅烧法制备g-C3N4材料,利用扫描电镜(Scanning Electron Microscope,SEM)、透射电镜(Transmission Electron Microscope,TEM)、循环伏安法(Cyclic Voltammetry,CV)和差分脉冲伏安法(Differential Pulse Voltammetry,DPV)等技术进行表征。结果显示,g-C3N4材料呈二维的片状纳米结构,具有较高的石墨化程度和丰富的N官能团含量,比表面积达到了61.35 m2/g。利用复合材料修饰玻碳电极(Glassy Carbon Electrode,GCE)构建电化学传感器g-C3N4/GCE,在最优条件下(pH5.5,富集电位0.3 V,富集时间5 min),传感器的峰电流与黄嘌呤浓度呈现良好的线性关系。在低浓度0.5~5 μmol/L范围内,线性关系为Ipa=0.310CXA+2.859(Ipa为峰电流,CXA为黄嘌呤浓度),决定系数R2=0.990,在高浓度5~200 μmol/L范围内,线性关系为Ipa=0.051CXA+4.034,R2=0.997,最低检测限(LOD)为0.28 μmol/L。使用该传感器测定双孢蘑菇、茶树菇、玉木耳中黄嘌呤含量分别为307.50、229.22、47.27 mg/100 g。相比常用的高效液相色谱法,g-C3N4电化学传感器稳定性好,相对标准偏差(RSD)为1.45%~3.69%,操作简便,能够用于菌菇中黄嘌呤的检测。

石墨相N化碳(g-C3N4)  /  电化学传感器  /  黄嘌呤  /  菌菇

This study aimed to construct a highly sensitive, reliable, and low-cost electrochemical sensor based on graphitic carbon nitride (g-C3N4) modified materials for efficient and convenient detection of purine content in edible mushrooms. The g-C3N4 material was fabricated through a high-temperature calcination method, and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), and differential pulse voltammetry (DPV). The results indicated that the g-C3N4 material exhibited a two-dimensional sheet-like nanostructure, characterized by a high degree of graphitization, abundant N-functional group content, and a specific surface area of 61.35 m2/g. An electrochemical sensor (g-C3N4/GCE) was fabricated by modifying a glassy carbon electrode (GCE) with the composite material. Under optimal conditions (pH5.5, enrichment potential of 0.3 V, and enrichment time of 5 min), the peak current of the sensor demonstrated a favorable linear relationship with the concentration of xanthine. Within the low concentration range of 0.5~5 μmol/L, a linear relationship was established as Ipa=0.310CXA+2.859 (where Ipa represented the peak current and CXA denoted the xanthine concentration), with a coefficient of determination R2=0.990. In the high concentration range of 5~200 μmol/L, the linear relationship was determined to be Ipa=0.051CXA+4.034, with R2=0.997. The minimum detection limit (LOD) was calculated to be 0.28 μmol/L. According to this sensor, the xanthine content in shiitake mushrooms, tea tree mushrooms, and wood ears were 307.50, 229.22, and 47.27 mg/100 g, respectively. Compared with the commonly used high-performance liquid chromatography method, the g-C3N4 electrochemical sensor exhibited good stability, with a relative standard deviation (RSD) of 1.45%~3.69%, and the operation was simple, which could be used for the detection of xanthine in edible mushrooms.

graphitic carbon nitride (g-C3N4)  /  electrochemical sensor  /  xanthine  /  edible mushrooms
陈志炎, 赵祖云, 陈怡鑫, 任怡璇, 高亚军. 基于g-C3N4的电化学传感器高效检测菌菇中黄嘌呤含量. 食品工业科技, 2026 , 47 (3) : 284 -291 . DOI: 10.13386/j.issn1002-0306.2025020172
Zhiyan CHEN, Zuyun ZHAO, Yixin CHEN, Yixuan REN, Yajun GAO. Efficient Detection of Xanthine Content in Edible Mushrooms Using Electrochemical Sensors Based on g-C3N4[J]. Science and Technology of Food Industry, 2026 , 47 (3) : 284 -291 . DOI: 10.13386/j.issn1002-0306.2025020172
黄嘌呤广泛存在于多种食物中,如肉类、豆制品以及多种蘑菇等[1]。黄嘌呤是人体内尿酸代谢的前体物质,同时也具有温和的兴奋和支气管扩张等生理作用,适量摄入对特定人群的健康有益,如哮喘患者[2−3]。但是,过量的黄嘌呤摄入可能会引发高尿酸血症,进而导致慢性关节炎、痛风、高血压[4−5]、肾脏疾病、泌尿系感染[6−7]及心脑血管疾病等问题[8]。此外,过量摄入黄嘌呤也可能导致失眠、心悸、情绪激动等不良反应[9−10]。天然食物中的菌菇作为一种常见的食物,不仅含有丰富的营养物质如矿物质、纤维素及多酚类物质等,同时也具有较高含量的黄嘌呤,过多食用可能对痛风患者产生潜在威胁[11]。因此,有必要建立一种高效灵敏的检测方法以评估食物中黄嘌呤的含量,这对于为消费者尤其是痛风患者提供科学的膳食指导具有重要意义。
常用的黄嘌呤检测方法包括高效液相色谱法[12−16]、毛细管电泳法[16−18]、质谱法[19−20]、光纤表面等离子体共振法等[10,21]。然而,这些方法成本高、操作复杂,无法实现食品中黄嘌呤含量的快速筛查[22−23]。近年来,将电化学传感器应用于食品中黄嘌呤检测受到了广泛的关注,耿吴越等[24]合成了系列金属卟啉基共价-有机框架/炭黑复合材料(COF-366/CB),并用于修饰玻碳电极,能同时检测出鸟嘌呤、N6-甲基腺嘌呤和腺嘌呤,且互不干扰。宋光捷等[25]制备了壳聚糖/氮掺杂还原氧化石墨烯(CS/N-RGO)复合材料,其对黄嘌呤有着优异的电化学响应。电化学法具有样品损耗低、敏感度高、反应迅速以及设备小型化等显著优点,但样品中的其他电活性物质(如抗坏血酸、多巴胺等)可能干扰嘌呤的检测,导致信号重叠或假阳性结果[26],另外电极材料的制备工艺、表面修饰方法以及操作条件(如pH、温度)可能影响检测结果的重现性[27]。为了追求更好的电化学传感器性能,研究具有高电催化活性的新型纳米材料对于放大电化学信号、提高检测灵敏度至关重要[28]。石墨相氮化碳(g-C3N4)纳米材料凭借其比表面积大、活性位点丰富等优异的理化性能,能够显著增强电化学响应信号,被广泛应用于电化学传感器领域[29−31]。因此,本研究通过合成g-C3N4纳米材料,测试其对黄嘌呤的检测性能,建立一种高灵敏度的菌菇中黄嘌呤含量检测的电化学传感器方法。
黄嘌呤(≥98%)、葡萄糖(≥99.0%)、维生素C(≥99%)、谷胱甘肽(≥99%) 上海麦克林生化科技有限公司;三聚氰胺(≥99.9%)、醋酸钠(NaAc)(≥99%)、甘氨酸(≥99%)、乳糖(≥99%)、半乳糖(≥99%)、蔗糖(≥99.5%)、麦芽糖(≥98%) 上海阿拉丁生化科技股份有限公司;乙醇(≥99.7%)、磷酸二氢钠(≥99%)、磷酸氢二钠(≥99%) 均为分析纯,国药集团(上海)化学试剂有限公司;双孢蘑菇、茶树菇、玉木耳干货 扬州永辉超市;实验用水均为去离子水。
XW-80C型涡旋混合器 上海医大仪器有限公司;Tecnai 12型透射电子显微镜(TEM) 荷兰飞利浦公司;S-4800Ⅱ型场发射扫描电子显微镜(SEM) 日本日立公司;In Via Reflex型拉曼光谱仪 英国雷尼绍公司;Autosorb IQ3型比表面分析及孔径综合分析仪(BET) 美国康塔仪器公司;ESCALAB 250Xi型X射线光电子能谱仪(XPS) 赛默飞世尔科技公司;CHI660E型电化学工作站 上海辰华仪器有限公司;KQ5200型超声波清洗器 昆山市超声仪器有限公司;LC-DMS-ProN型磁力搅拌器、PHS-3E型pH计 上海力辰邦西仪器科技有限公司;DHG-9036A型电热恒温鼓风干燥箱 上海精宏实验设备有限公司;500A型多功能粉碎机 永康市速锋工贸有限公司;BSA124S型电子天平 赛多利斯科学仪器有限公司;TG16-WS台式高速离心机 湖南湘仪实验室仪器开发有限公司。
在氮气氛围下,将10 g三聚氰胺在500 ℃下以5 ℃/min的加热速率煅烧2 h,得到浅黄色的g-C3N4[32]。
通过SEM、TEM、拉曼光谱仪、XPS以及BET等手段对制备得到的g-C3N4材料进行外部形貌及内部元素状态的表征。利用SEM在电压为10 kV、放大倍数为5万倍的测试条件下,对经过喷金处理后的复合材料进行形貌表征;利用TEM分析样品的微观结构:加速电压200 kV,点分辨率0.23 nm,放大倍数10万倍;利用拉曼光谱仪分析样品的石墨化和缺陷程度:激发波长532 nm,扫描时间10 s/次,激光功率20 mW,光谱采集范围600~2200 cm−1;利用XPS鉴定压片后的粉末样品中化学元素的组成和电子价态;利用BET对复合材料的比表面积及孔径分布进行表征:以高纯氮气为吸附质、液氮(77.35 K)为吸附温度,样品经150 ℃真空脱气6 h预处理后,在0.001~0.995 P/P0范围采集数据,比表面积用BET多点法(0.05~0.3 P/P0,R2≥0.999)计算,孔径分布采用BJH/DFT模型分析。
使用0.3 μm厚的氧化铝颗粒打磨出具有良好表面的玻璃电极(GCE),接着将其依次放入水、乙醇中做深度清洁,然后用高纯度的流动高压氮气吹干。随后将大约5 μL的g-C3N4水基悬浮剂以2 g/mL的比例加入到已经准备好的电极上,最后自然风干即为带有g-C3N4涂层的改良型电极g-C3N4/GCE。
实验以浓度0.1 mol/L的PBS磷酸缓冲溶液为电解质溶液,采用差分脉冲伏安法(DPV)进行测试,扫描速率为100 mV/s。在单因素优化实验中,首先设定富集电位为0.3 V、富集时间为5 min作为基准条件,依次考察pH5.0~8.0的PBS缓冲溶液、0~0.6 V的富集电位以及0~8 min的富集时间等检测条件对g-C3N4/GCE传感器氧化峰响应电流的影响。其中,当考察某一因素时,其余条件均保持上述基准值。
使用预先准备好的电化学检测设备对包含0.5~200 μmol/L黄嘌呤的10 mL PBS溶液(浓度为0.1 mol/L,pH为5.5)进行DPV分析。将电压设定在0.3 V并持续收集数据5 min。测试区间为0.4~1.1 V,脉冲强度为50 mV,脉冲长度为50 ms。
本研究通过以下实验评估传感器性能:重现性为连续7次测定150 μmol/L黄嘌呤的电流响应;稳定性为将传感器在4 ℃储存0~30 d后,测定相同浓度黄嘌呤的电流变化;选择性为比较传感器对200 μmol/L黄嘌呤与等浓度常见干扰物的响应差异。
分别称取50 g双孢蘑菇、茶树菇、玉木耳干货,用多功能粉碎机粉碎,过60目网筛[29]。精密称取50 mg双孢蘑菇、茶树菇、玉木耳粉末,分别加入5%(v/v)乙醇溶液5 mL,超声萃取30 min。5000 r/min离心10 min,去除沉淀,将上清液用0.5 μm针式过滤器过滤,然后用0.2 mol/L氢氧化钠溶液调节pH至7.0,使用5%乙醇定容至50 mL,待用。采用标准加入法测定样品中黄嘌呤的含量:取等体积的样品提取液和已知量的黄嘌呤溶液(黄嘌呤终浓度分别为40、80和120 μmol/L)混合均匀。按照1.2.5进行黄嘌呤的电化学检测。
取等体积样品提取液分别与终浓度为40、80和120 μmol/L的黄嘌呤溶液混合,在如下色谱条件下测定:色谱柱选用岛津GL Science C18(4.6 mm×250 mm,5 μm)/C18-AQ(4.6 mm×250 mm,5 μm);流动相为0.01 mol/L磷酸二氢钾缓冲液(含0.005 mol/L四丁基溴化铵),pH6.0;流速1.0 mL/min,柱温30 ℃,进样量20 μL。定性分析:利用特定色谱条件(固定相类型、流动相组成、柱温、流速等)下,各物质与固定相相互作用差异导致的保留时间不同,同时结合紫外吸收光谱特征(如黄嘌呤在266.4 nm处呈现最强吸收峰),通过对比样品与标准品的吸收波长及保留时间确定物质属性。定量分析:采用外标法,具体为:配制系列浓度的黄嘌呤标准品溶液,在相同色谱条件下测定峰面积,以峰面积为纵坐标、标准液浓度为横坐标绘制标准曲线,建立线性方程。根据测得的峰面积,代入线性方程计算样品中黄嘌呤含量[33]。
每组做三个平行,结果取平均值;采用Origin2021与ChemDraw 22.0.0软件绘图。
利用SEM和TEM观察合成材料的表面形貌和微观结构,结果如图1所示。图1(A)显示g-C3N4材料为典型的微米级块体,由每块二维纳米片在热聚合过程中聚集团聚形成。图1(B)显示二维g-C3N4材料呈片状结构。SEM与TEM观察到的结果一致,均显示g-C3N4材料为二维纳米结构。
采用拉曼光谱研究g-C3N4的石墨化和缺陷程度。如图2所示,缺陷无序(D)带和石墨(G)带引起的谱带分别在约1350 cm−1和1580 cm−1处观察到。这些带的积分强度之比(IG/ID)是碳质材料的石墨化和结晶度的量度[33]。将D峰和G峰的光谱强度做比值,得出g-C3N4的IG/ID值为0.84,表明g-C3N4石墨化程度较高,这为材料具备较高的电传输速率和优异的电化学响应性能奠定了基础。
利用XPS光谱研究了g-C3N4的元素组成和化学键结构。如图3(A)所示,XPS分析表明g-C3N4由C、N和O元素组成,且g-C3N4的含N量为55%。高精度的XPS光谱显示了g-C3N4的N1s光谱特征(图3(B)),主要包括两组能量分别为396.86和398.73 eV的拟合峰,这些峰来自吡啶N (N-6)和吡咯N (N-5)[34]。由于吡啶N具备吸附质子和氧气及向催化位置传递的能力,因此它能够作为一种有效的N源参与反应过程。此外,吡咯N在氧还原反应中起着重要作用,会促进电子转移过程,从而加快催化反应的速度[35]。
利用N2吸附-脱附实验探究g-C3N4的比表面积。如图3(C)所示,根据N2吸附-脱附过程等温曲线推算出g-C3N4的BET比表面积达到了61.35 m2/g。g-C3N4较大的比表面积使其能有效地为电子传递及目标物的吸收提供充足的空间[36]。图3(D)表明,g-C3N4的多尺寸空隙结构有利于其吸附与催化性能。结合以上结果,g-C3N4具有大的比表面积、丰富的N官能团含量(吡啶N和吡咯N)的优点,意味着g-C3N4具有良好的催化活性,在电化学和比色分析检测应用中具有良好的潜力。
利用循环伏安法(CV)在外部氧化还原剂[Fe(CN)6]3−的存在下,研究了g-C3N4修饰电极的电化学性能[37−38]。记录了GCE和g-C3N4/GCE修饰电极在100 mV/s下的CV图(图4(A))。结果显示,相较于原始GCE,经过g-C3N4修饰后的GCE呈现出两个明显的氧化还原峰,其峰值电流大幅度提升,表明g-C3N4对GCE进行了有效的改造,从而增加了其导电性能和表面电子传输速度。
通过电化学阻抗谱法(EIS)探究电极表面的界面性质[39]。从EIS图来看,电子转移电阻(Ret)和电化学阻抗谱的半圆直径有直接关系。观察图4(B)可以发现,当运用g-C3N4涂层到电极上时,其半圆形的直径比未加任何处理的GCE小得多,表明经过改良后的电极g-C3N4/GCE拥有最小的界面电荷转移电阻,这个结果与CV测试的数据一致。
用差分脉冲伏安法(DPV)研究原始GCE和修饰电极g-C3N4/GCE在0.1 mol/L的PBS缓冲溶液(pH5.0)中的电流响应[40]。使用100 mV/s的扫描速率,对GCE和g-C3N4/GCE进行了扫描。从图5可以看出,不存在黄嘌呤的情况下,原始GCE没有出现可见峰。随后加入150 μmol/L的黄嘌呤,此时原始GCE在0.72 V左右出现微弱的氧化峰电流,这是由于黄嘌呤在电极表面发生氧化反应,而修饰电极g-C3N4/GCE的氧化峰有明显增强,峰值约为11 μA,为GCE响应电流的2.2倍。这说明g-C3N4/GCE对黄嘌呤具有良好的电催化性能。
考虑到PBS溶液对黄嘌呤在修饰电极上的电化学响应有显著影响,因此采用DPV法研究在不同pH(5.0~8.0)的0.1 mol/L PBS溶液中黄嘌呤电化学传感器性能的变化[28]。由图6(A)可见,氧化峰电位随着pH升高呈现负移动趋势,表明黄嘌呤在g-C3N4/GCE上的氧化还原反应伴随着质子的转移。由图6(B)可见,当pH达到5.5时,氧化峰电流值达到最高,然后逐渐降低,这可能是由于弱酸性条件下,黄嘌呤的五元咪唑环可以被质子化,更快地从核苷酸中水解并游离出来[11],因此选择pH5.5作为后续优化条件。
图7(A)显示了富集电位对黄嘌呤响应信号的影响。富集电位在0~0.6 V范围内,富集时间为5 min。当富集电位从0 V增加到0.3 V时,黄嘌呤的氧化峰电流逐渐增加。当富集电位由0.3 V增加至0.6 V时,黄嘌呤的氧化峰电流迅速减少。因此采用0.3 V作为富集电位。富集时间对黄嘌呤响应信号的影响如图7(B)所示。富集时间由0增至5 min后,黄嘌呤的氧化峰电流明显增强,说明一定时间的富集能提高敏感度。继续增大富集时间至8 min,氧化峰值电流逐渐稳定,说明黄嘌呤在电极表面上的富集数量已经接近了上限值。考虑到灵敏度和检测时间的因素,选择富集时长为5 min。
在最佳条件下使用DPV测定了制备的黄嘌呤电化学传感器的分析性能,电势扫描范围为0.4~1.1 V。在测定中,只有目标分子的浓度发生了变化。结果如图8(A)所示,黄嘌呤的阳极电流随着其浓度增加而增加(0.5~200 μmol/L范围)。图8(B)显示了加入不同浓度的黄嘌呤后,g-C3N4/GCE的响应电流和浓度的线性关系。在低浓度0.5~5 μmol/L范围内,线性关系为Ipa=0.310CXA+2.859,R2=0.990,在高浓度5~200 μmol/L范围内,线性关系为Ipa=0.051CXA+4.034,R2=0.997,最低检测限LOD为0.28 μmol/L。结果表明,该方法对黄嘌呤的检测具有良好的定量性能。
在最佳检测条件下,对传感器的重现性进行了评估。根据图9(A)显示的结果,对150 μmol/L黄嘌呤的电流值进行了多次测定,其相对标准偏差为2.2%,证明了所制备的黄嘌呤电化学传感器具有良好的重现性。接下来进行了传感器稳定性的评估,在4 ℃下储存了0、5、10、15、20、25和30 d后,使用150 μmol/L的黄嘌呤处理并检测,记录了峰值电流数据。如图9(B)所示,实验结果显示,在30 d后,电流值仍保持在初始信号的90%,表明该传感器具有良好的稳定性。
选择性测试是评估电化学传感器实用性的重要参数。生物体内存在多种与黄嘌呤结构相似、性质相近的化合物,这些化合物在检测过程中可能产生干扰,影响黄嘌呤的准确测定。本研究选取了甘氨酸、L-半胱氨酸、葡萄糖、乳糖、半乳糖、麦芽糖、蔗糖为参考物质进行实验,同时还测试了谷胱甘肽和抗坏血酸。图10结果显示,在相同浓度条件下(200 μmol/L),除了黄嘌呤的电流响应值达到14 μA以上,其他物质的电流响应值均低于2 μA,说明该传感器对黄嘌呤的选择性好,精确度高。
为了验证本方法对菌菇中黄嘌呤检测的适用性,选取了双孢蘑菇、茶树菇、玉木耳进行测试。采用加标回收法检测黄嘌呤的回收率和RSD,并与高效液相色谱法(HPLC)进行对比。将已知浓度(40、80和120 μmol/L)的黄嘌呤标准溶液加入检测系统中,结果如表1所示。在加标量为40 μmol/L时,电化学法检测黄嘌呤的回收率为102.02%~103.78%,RSD为1.45%~3.21%,HPLC法检测黄嘌呤的回收率为88.35%~94.74%,RSD为1.03%~2.17%,此时电化学法的回收率明显高于HPLC法。当加标量为80 μmol/L和120 μmol/L时,两种方法的加标回收率没有明显差异。样品中实际黄嘌呤含量的检测结果显示,电化学法对3种菌菇中黄嘌呤的检出量均高于HPLC法,说明电化学法的检测灵敏度更高。此外,对基于镍掺杂二硫化锡/多壁碳纳米管(Ni/SnS2/MWCNTs)[41]和金掺杂沸石咪唑酸盐框架-8/有序介孔碳(Au-ZIF-8/OMC)[42]两种复合材料构建的电化学传感器进行对比分析。结果表明,前者对黄嘌呤的加标回收率为92.9%~112.6%,后者为96%~106%。相比之下,本研究方法在三种加标水平下均表现出更稳定、更接近100%的回收率,展示出更高的准确性和灵敏度。
本研究构建了一种基于g-C3N4材料无标记电化学传感器用于快速检测双孢蘑菇、茶树菇、玉木耳中的黄嘌呤。在最优条件下,g-C3N4/GCE具有良好的线性范围,最低检测限LOD为0.28 μmol/L。通过本研究建立的电化学分析法能够准确测定双孢蘑菇、茶树菇、玉木耳中黄嘌呤含量。该电化学传感器具有灵敏度高、稳定性好和响应速度快等优点,能够用于菌菇中黄嘌呤的快速检测。

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2026年第47卷第3期
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doi: 10.13386/j.issn1002-0306.2025020172
  • 接收时间:2025-02-24
  • 首发时间:2026-10-25
  • 出版时间:2026-02-01
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  • 收稿日期:2025-02-24
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    1扬州大学旅游烹饪学院,江苏扬州 225127
    2中餐非遗技艺传承文化和旅游部重点实验室,江苏扬州 225127
    3扬州大学食品科学与工程学院,江苏扬州 225127
    4山东农业大学农学院,山东泰安 271017

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高亚军(1984−),男,博士,讲师,研究方向:微生物检测及生物传感的构建与应用,E-mail:。
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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