Article(id=1153986589228262139, tenantId=1146029695717560320, journalId=1149652044408987649, issueId=1153986579971429187, articleNumber=null, orderNo=null, doi=10.19812/j.cnki.jfsq11-5956/ts.20241121001, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1732118400000, receivedDateStr=2024-11-21, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1753061442906, onlineDateStr=2025-07-21, pubDate=1740412800000, pubDateStr=2025-02-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1753061442906, onlineIssueDateStr=2025-07-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1753061442906, creator=13701087609, updateTime=1753061442906, updator=13701087609, issue=Issue{id=1153986579971429187, tenantId=1146029695717560320, journalId=1149652044408987649, year='2025', volume='16', issue='4', pageStart='1', pageEnd='320', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1753061440699, creator=13701087609, updateTime=1758783495950, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1177986619249406427, tenantId=1146029695717560320, journalId=1149652044408987649, issueId=1153986579971429187, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1177986619249406428, tenantId=1146029695717560320, journalId=1149652044408987649, issueId=1153986579971429187, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=178, endPage=184, ext={EN=ArticleExt(id=1153986589895156496, articleId=1153986589228262139, tenantId=1146029695717560320, journalId=1149652044408987649, language=EN, title=Traceability of geographical origin of Cyperus esculentus based on chemometrics and near infrared spectroscopy, columnId=1153986581653349021, journalTitle=Journal of Food Safety & Quality, columnName=Special Topic: Application of Modern Analysis Instrument in Food Detection, runingTitle=null, highlight=null, articleAbstract=

Objective To analyze Cyperus esculentus by near infrared spectroscopy, and trace geographical origin of Cyperus esculentus by the identification model in chemometrics. Methods A total of 408 samples of Cyperus esculentus samples from Hebei, Hunan, Shandong, Xinjiang, and Yunnan were analyzed for provenance tracing using near-infrared spectroscopy and chemometric software, 3 kinds of spectral preprocessing methods including multiplicative scatter correction, standard normal variate transformation and standard normal variate transformation & detrending, were used respectively, and 5 kinds of recognition modes such as support vector machine (SVM), soft independent modeling of class analogy (SIMCA), orthogonal partial least squares discriminant analysis (OPLS-DA), partial least squares discriminant analysis (PLS-DA), and K-nearest neighbor algorithm (KNN) were used to identify the geographical origin. Results The modeling recognition rates of the 5 kinds of modes including SVM, SIMCA, OPLS-DA, PLS-DA, and KNN were 91.89%, 94.47%, 62.37%, 65.32%, and 100.00% respectively. The KNN was selected as the origin identification model, and the impact of different preprocessing methods, data preprocessing and sample distance on the stability of the model prediction results were analyzed in order to select the optimal model parameters. The prediction set recognition rate could reach 100.00% by using multiplicative scatter correction spectral preprocessing method, one of data preprocessing methods including UV, Pareto, automatic, or centering, and block distance as the sample distance. Conclusion The technology of near infrared spectroscopy combined with KNN mode has the advantages of fast analysis speed, simple operation, easy sample pretreatment, non-destructive, on-line qualitative and quantitative analysis, etc., and has a certain application prospect.

, correspAuthors=Yong-Tan YANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, 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, authorCompany=null, fund=null, authors=null, authorsList=Xiao-Hong LUO, Nan-Xi WANG, Hong-Juan CHEN, Xu-Hui ZHUANG, Tian-Tian SUN, Jin-Xiu XIAO, Yu-Pei LINGHU, Yong-Tan YANG), CN=ArticleExt(id=1153986615341998606, articleId=1153986589228262139, tenantId=1146029695717560320, journalId=1149652044408987649, language=CN, title=基于化学计量学和近红外光谱法的油莎豆产地溯源, columnId=1153986581842092705, journalTitle=食品安全质量检测学报, columnName=本期专题:现代分析仪器在食品检测中的应用, runingTitle=null, highlight=null, articleAbstract=

目的 采用近红外光谱技术对油莎豆进行分析, 并应用化学计量学中识别模式对油莎豆进行产地溯源。方法 采用近红外光谱法结合化学计量学软件, 对来自河北、湖南、山东、新疆、云南等地408份油莎豆样品进行产地溯源, 分别采用多元散射校正、多量标准化或多量标准化耦合去趋势算法3种光谱预处理方法和支持向量机(support vector machine, SVM)、簇类独立分类(soft independent modeling of class analogy, SIMCA)、正交偏最小二乘判别(orthogonal partial least squares discriminant analysis, OPLS-DA)、偏最小二乘判别(partial least squares discriminant analysis, PLS-DA)、和K最近邻算法(K-nearest neighbor algorithm, KNN)等5种识别模式进行产地识别。结果 SVM、SIMCA、OPLS-DA、PLS-DA和KNN等5种模式的建模识别率分别为91.89%、94.47%、62.37%、65.32%和100.00%。选择KNN作为产地识别模型, 分析不同预处理方法、数据预处理及样本距离对模型预测结果稳定性的影响, 筛选出最优模型参数。选用多元散射校正光谱预处理方式, 在UV标度化、Pareto标度化、自动标度化或中心化任一种数据预处理条件下, 样本距离选用街区距离, 测试集识别率能达到100.00%。结论 近红外光谱结合KNN模式的技术具有分析速度快、操作简单、样本预处理容易、无损、在线的定性定量分析等优点, 具有一定应用前景。

, correspAuthors=杨永坛, authorNote=null, correspAuthorsNote=
* 杨永坛(1971—), 男, 博士, 研究员, 主要研究方向为食品加工与安全。E-mail:
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罗晓宏(1986—), 女, 硕士, 助理研究员, 主要研究方向为仪器分析方法开发及应用。E-mail:

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罗晓宏(1986—), 女, 硕士, 助理研究员, 主要研究方向为仪器分析方法开发及应用。E-mail:

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罗晓宏(1986—), 女, 硕士, 助理研究员, 主要研究方向为仪器分析方法开发及应用。E-mail:

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European Journal of Lipid Science and Technology, 2019, 121(12): 190028., articleTitle=A systematic chemometric approach to identify the geographical origin of olive oils, refAbstract=null)], funds=[Fund(id=1178002215076769794, tenantId=1146029695717560320, journalId=1149652044408987649, articleId=1153986589228262139, awardId=JY2408, language=CN, fundingSource=中央级公益性科研院所基本科研业务费项目(JY2408), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1178002210647585721, tenantId=1146029695717560320, journalId=1149652044408987649, articleId=1153986589228262139, xref=null, ext=[AuthorCompanyExt(id=1178002210718888890, tenantId=1146029695717560320, journalId=1149652044408987649, articleId=1153986589228262139, companyId=1178002210647585721, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1. 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Classification results of sample data sets

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编号 分类名称 归属 总样本/个 训练集/个 测试集
/个
1 河北 训练集 30 30 -
2 湖南 训练集 15 15 -
3 山东 训练集 21 21 -
4 新疆 训练集 175 175 -
5 云南 训练集 30 30 -
6 河北预测 测试集 15 - 15
7 湖南预测 测试集 9 - 9
8 山东预测 测试集 9 - 9
9 新疆预测 测试集 89 - 89
10 云南预测 测试集 15 - 15
合计 408 271 137
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样品数据集的分类结果

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编号 分类名称 归属 总样本/个 训练集/个 测试集
/个
1 河北 训练集 30 30 -
2 湖南 训练集 15 15 -
3 山东 训练集 21 21 -
4 新疆 训练集 175 175 -
5 云南 训练集 30 30 -
6 河北预测 测试集 15 - 15
7 湖南预测 测试集 9 - 9
8 山东预测 测试集 9 - 9
9 新疆预测 测试集 89 - 89
10 云南预测 测试集 15 - 15
合计 408 271 137
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Results of identification based on 5 kinds of modeling patterns to model

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模式 光谱
预处理
数据
预处理
训练集
识别率/%
验证集
识别率/%
SVM 自动标度化 91.89 85.24
SIMCA 自动标度化 94.47 90.77
OPLS-DA 自动标度化 62.37 66.42
PLS-DA 自动标度化 65.32 83.39
KNN 自动标度化 100.00 100.00
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5种模式建模识别结果

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模式 光谱
预处理
数据
预处理
训练集
识别率/%
验证集
识别率/%
SVM 自动标度化 91.89 85.24
SIMCA 自动标度化 94.47 90.77
OPLS-DA 自动标度化 62.37 66.42
PLS-DA 自动标度化 65.32 83.39
KNN 自动标度化 100.00 100.00
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Effects of different spectral preprocessing on pattern recognition results

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模式 光谱预处理优化 训练集识别率/% 验证集识别率/% 测试集识别率/%
河北 湖南 山东 新疆 云南 平均值
KNN MSC+自动标度化 100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
SNV+自动标度化 100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
SNV+Detrending+
自动标度化
100.00 100.00 100.00 100.00 66.00 98.00 100.00 92.80
未经处理+自动标度化 100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
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不同光谱预处理对模式识别结果的影响

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模式 光谱预处理优化 训练集识别率/% 验证集识别率/% 测试集识别率/%
河北 湖南 山东 新疆 云南 平均值
KNN MSC+自动标度化 100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
SNV+自动标度化 100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
SNV+Detrending+
自动标度化
100.00 100.00 100.00 100.00 66.00 98.00 100.00 92.80
未经处理+自动标度化 100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
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Effects of data preprocessing on pattern recognition results

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模式 数据预处理优化 训练集
识别率/%
验证集
识别率/%
测试集识别率/%
河北 湖南 山东 新疆 云南 平均值
KNN MSC+UV标度化+
欧氏距离
100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
MSC+Pareto标度化+
欧氏距离
100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
MSC+自动标度化+
欧氏距离
100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
MSC+均一化+
欧氏距离
100.00 100.00 100.00 100.00 67.00 92.00 100.00 91.80
MSC+中心化+
欧氏距离
100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
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数据预处理对模式识别结果的影响

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模式 数据预处理优化 训练集
识别率/%
验证集
识别率/%
测试集识别率/%
河北 湖南 山东 新疆 云南 平均值
KNN MSC+UV标度化+
欧氏距离
100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
MSC+Pareto标度化+
欧氏距离
100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
MSC+自动标度化+
欧氏距离
100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
MSC+均一化+
欧氏距离
100.00 100.00 100.00 100.00 67.00 92.00 100.00 91.80
MSC+中心化+
欧氏距离
100.00 100.00 100.00 100.00 89.00 94.00 100.00 96.60
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Effects of sample distance on pattern recognition results

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模式 样本距离优化 训练集
识别率/%
验证集
识别率/%
测试集识别率/%
河北 湖南 山东 新疆 云南 平均值
KNN MSC+UV标度化+
街区距离
100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00
MSC+Pareto标度化+
街区距离
100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00
MSC+自动标度化+
街区距离
100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00
MSC+均一化+街区距离 100.00 100.00 100.00 100.00 89.00 100.00 100.00 97.80
MSC+中心化+街区距离 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00
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样本距离对模式识别结果的影响

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模式 样本距离优化 训练集
识别率/%
验证集
识别率/%
测试集识别率/%
河北 湖南 山东 新疆 云南 平均值
KNN MSC+UV标度化+
街区距离
100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00
MSC+Pareto标度化+
街区距离
100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00
MSC+自动标度化+
街区距离
100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00
MSC+均一化+街区距离 100.00 100.00 100.00 100.00 89.00 100.00 100.00 97.80
MSC+中心化+街区距离 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00
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基于化学计量学和近红外光谱法的油莎豆产地溯源
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罗晓宏 1 , 王楠希 1 , 陈红娟 1 , 庄绪会 1 , 孙恬恬 1 , 肖巾秀 2 , 令狐羽珮 2 , 杨永坛 1, *
食品安全质量检测学报 | 本期专题:现代分析仪器在食品检测中的应用 2025,16(4): 178-184
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食品安全质量检测学报 | 本期专题:现代分析仪器在食品检测中的应用 2025, 16(4): 178-184
基于化学计量学和近红外光谱法的油莎豆产地溯源
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罗晓宏1 , 王楠希1, 陈红娟1, 庄绪会1, 孙恬恬1, 肖巾秀2, 令狐羽珮2, 杨永坛1, *
作者信息
  • 1.国家粮食和物资储备局科学研究院, 北京 100037
  • 2.北京农学院食品科学与工程学院, 北京 102200
  • 罗晓宏(1986—), 女, 硕士, 助理研究员, 主要研究方向为仪器分析方法开发及应用。E-mail:

通讯作者:

* 杨永坛(1971—), 男, 博士, 研究员, 主要研究方向为食品加工与安全。E-mail:
Traceability of geographical origin of Cyperus esculentus based on chemometrics and near infrared spectroscopy
Xiao-Hong LUO1 , Nan-Xi WANG1, Hong-Juan CHEN1, Xu-Hui ZHUANG1, Tian-Tian SUN1, Jin-Xiu XIAO2, Yu-Pei LINGHU2, Yong-Tan YANG1, *
Affiliations
  • 1. Academy of National Food and Strategic Reserves Administration, Beijing 100037, China
  • 2. Food Science and Engineering College, Beijing University of Agriculture, Beijing 102200, China
出版时间: 2025-02-25 doi: 10.19812/j.cnki.jfsq11-5956/ts.20241121001
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目的 采用近红外光谱技术对油莎豆进行分析, 并应用化学计量学中识别模式对油莎豆进行产地溯源。方法 采用近红外光谱法结合化学计量学软件, 对来自河北、湖南、山东、新疆、云南等地408份油莎豆样品进行产地溯源, 分别采用多元散射校正、多量标准化或多量标准化耦合去趋势算法3种光谱预处理方法和支持向量机(support vector machine, SVM)、簇类独立分类(soft independent modeling of class analogy, SIMCA)、正交偏最小二乘判别(orthogonal partial least squares discriminant analysis, OPLS-DA)、偏最小二乘判别(partial least squares discriminant analysis, PLS-DA)、和K最近邻算法(K-nearest neighbor algorithm, KNN)等5种识别模式进行产地识别。结果 SVM、SIMCA、OPLS-DA、PLS-DA和KNN等5种模式的建模识别率分别为91.89%、94.47%、62.37%、65.32%和100.00%。选择KNN作为产地识别模型, 分析不同预处理方法、数据预处理及样本距离对模型预测结果稳定性的影响, 筛选出最优模型参数。选用多元散射校正光谱预处理方式, 在UV标度化、Pareto标度化、自动标度化或中心化任一种数据预处理条件下, 样本距离选用街区距离, 测试集识别率能达到100.00%。结论 近红外光谱结合KNN模式的技术具有分析速度快、操作简单、样本预处理容易、无损、在线的定性定量分析等优点, 具有一定应用前景。

油莎豆  /  近红外光谱技术  /  K最近邻算法  /  产地溯源

Objective To analyze Cyperus esculentus by near infrared spectroscopy, and trace geographical origin of Cyperus esculentus by the identification model in chemometrics. Methods A total of 408 samples of Cyperus esculentus samples from Hebei, Hunan, Shandong, Xinjiang, and Yunnan were analyzed for provenance tracing using near-infrared spectroscopy and chemometric software, 3 kinds of spectral preprocessing methods including multiplicative scatter correction, standard normal variate transformation and standard normal variate transformation & detrending, were used respectively, and 5 kinds of recognition modes such as support vector machine (SVM), soft independent modeling of class analogy (SIMCA), orthogonal partial least squares discriminant analysis (OPLS-DA), partial least squares discriminant analysis (PLS-DA), and K-nearest neighbor algorithm (KNN) were used to identify the geographical origin. Results The modeling recognition rates of the 5 kinds of modes including SVM, SIMCA, OPLS-DA, PLS-DA, and KNN were 91.89%, 94.47%, 62.37%, 65.32%, and 100.00% respectively. The KNN was selected as the origin identification model, and the impact of different preprocessing methods, data preprocessing and sample distance on the stability of the model prediction results were analyzed in order to select the optimal model parameters. The prediction set recognition rate could reach 100.00% by using multiplicative scatter correction spectral preprocessing method, one of data preprocessing methods including UV, Pareto, automatic, or centering, and block distance as the sample distance. Conclusion The technology of near infrared spectroscopy combined with KNN mode has the advantages of fast analysis speed, simple operation, easy sample pretreatment, non-destructive, on-line qualitative and quantitative analysis, etc., and has a certain application prospect.

Cyperus esculentus  /  near infrared spectroscopy  /  K-nearest neighbor algorithm  /  geographical origin
罗晓宏, 王楠希, 陈红娟, 庄绪会, 孙恬恬, 肖巾秀, 令狐羽珮, 杨永坛. 基于化学计量学和近红外光谱法的油莎豆产地溯源. 食品安全质量检测学报, 2025 , 16 (4) : 178 -184 . DOI: 10.19812/j.cnki.jfsq11-5956/ts.20241121001
Xiao-Hong LUO, Nan-Xi WANG, Hong-Juan CHEN, Xu-Hui ZHUANG, Tian-Tian SUN, Jin-Xiu XIAO, Yu-Pei LINGHU, Yong-Tan YANG. Traceability of geographical origin of Cyperus esculentus based on chemometrics and near infrared spectroscopy[J]. Journal of Food Safety & Quality, 2025 , 16 (4) : 178 -184 . DOI: 10.19812/j.cnki.jfsq11-5956/ts.20241121001
油莎豆(Cyperus esculentus)又名油莎草、虎坚果、铁荸荠等[1-2], 可食用或作为油料作物, 营养物质丰富, 其地下块茎中含淀粉25%~40%、油脂20%~30%、糖15%~20%、蛋白质5%~10%、膳食纤维8%~10%、维生素C和E 8~14 mg/100 g, 以及丰富的矿物质(钾、磷、钠、钙、镁), 是一种的多用途经济作物[3]。油莎豆中的脂肪酸、淄醇和多种酚类化合物具有抗氧化、降血糖血脂、抗菌等生物活性[4], 以及含有必需氨基酸的高活性蛋白[5], 正在受到食品、营养保健和畜牧生产领域的广泛关注, 有开发成为功能食品潜力。
油莎豆原产于非洲, 自1960年引入我国, 近年来种植规模和加工量逐年增加, 在我国新疆、河北、湖南、山东、吉林和广东等地都有种植, 油莎豆品质由于受到基因遗传、气候和土壤等因素的影响, 营养成分会发生变化[6], 不同产地的油莎豆品质不同, 导致市场的价格也会参差不齐, 一些不法商贩会趁机惨杂, 扰乱市场交易秩序, 因此, 建立油莎豆产地溯源就尤为重要。
目前, 产地溯源的方法有液相色谱法、气相色谱法和液相色谱-串联质谱法等[7-9], 虽然上述方法测试准确度高, 但是检测成本高, 需要大量化学试剂和前处理, 很难实现快速检测。而近红外光谱在12000~4000 cm-1, 可以检测样品中的-CH、-OH和-NH等化学键, 但由于仪器本身、环境、样品特性等因素的影响, 采集的光谱常出现噪声干扰、基线漂移、谱峰重叠等现象[10-11], 为此, 需要引入化学计量学方法, 并通过化学计量学方法分析其“指纹”特征, 可以实现全光谱和特定区域光谱的定性和定量分析, 从而实现产品的产地溯源。其中近红外光结合化学计量学技术因具有快速、高效和无损的检测特点, 适应当今市场快检需求, 已经在鳄嘴花、玉米油、黄精、海南山茶油、辣椒、柠檬和枸杞等[12-18]医药和农产品领域的产地鉴别中应用。
本研究拟利用傅里叶变换近红外漫反射光谱法结合化学计量学软件, 以5个省产地溯源识别准确率为指标, 采用5种识别模式算法, 建立产地与指纹图谱之间的关联, 实现油莎豆的近红外光谱定性分析模型, 提高产地溯源智能化和自动化分析水平。该技术不仅为油莎豆品牌保护, 而且也为产地溯源的应用研究提供理论依据。
MB3600傅立叶近红外光谱仪(加拿大ABB公司); JP-300A高速多功能粉碎机(永康市久品工贸有限公司); BPG-9056A电热鼓风干燥箱(上海一恒科学仪器有限公司); Chempattern化学计量学软件[科迈恩(北京)科技有限公司]。
收集新疆、云南、湖南、河北、山东等地油莎豆。时间集中在2023年10月13日和2023年11月10日期间, 每个采样地点进行区域设计, 来进行随机样品采集, 每个采样点收集3份1 kg的油莎豆, 记录采样信息并整理编号。
将采集的油莎豆按照地区整理, 按产地进行编号, 用超纯水对前处理后的油莎豆籽粒进行流动水清洗, 清洗后晾晒, 烘干至水分5%以下, 再进行粉碎处理, 过50目不锈钢筛, 得到油莎豆粉末样本, 存入密封袋, 于-20 ℃保存, 所有样本采用统一处理方式。
利用近红外光谱仪漫反射, 设备开机预热30 min, 铟砷检测器(InAsTEC)增益为80.36, 实验所处的环境温度为(25±1) ℃, 相对湿度为20%~30%, 将油莎豆粉末样本均匀的放入20 mL玻璃小瓶中, 然后安放于旋转支架, 启动光谱仪进行近红外光谱扫描, 光谱采集设置参数分辨率32 cm-1, 扫描次数64, 波长范围10000~4000 cm-1。托盘中样本紧密程度保持基本一致, 扫描过程中要避免样品间的交叉污染, 每次扫描后要用无尘纸擦净样品杯, 每个样品均扫描背景。
采用Chempattern 2020(x86)计量学软件绘制红外光谱图, 并利用软件中光谱预处理和不同算法的模式识别模块对近红外实验数据进行建模分析。其中光谱数据处理时常用的预处理方法很多, 如多元散射校正、多量标准化(standard normal variate transformation, SNV)和多量标准化耦合去趋势算法(standard normal variate transformation & detrending, SNV+Detrending)等[19]。采用计量学软件中模式识别模块计算训练集和测试集识别结果, 将数据结果导出至Excel 2021中, 应用EXACT函数判别识别结果真假, 用COUNTIFS函数计算识别正确结果个数。识别分类图采用计量学软件Chempattern制作, 采用Excel 2021绘制识别率表, 采用编程语言Python(版本3.9.13)绘制接收者操作特征(receiver operating characteristic, ROC)曲线和统计出曲线下面积(area under the curve, AUC)值。
模型预测正确率计算公式(1)如下。
$\text { 预测识别率 } / \%=\frac{\text { 预测正确产地数量 }}{\text { 所有预测产地数量 }} \times 100 \%$
K最近邻算法(K-nearest neighbor algorithm, KNN)模式中涉及的欧式距离、街区距离计算公式(2)和(3)如下。
N维空间的两个点A (X1, X2, ……XN)和B (Y1, Y2, ……YN)。
$d(A, B)=\sqrt{\sum_{i=1}^{N}\left(X_{i}-Y_{i}\right)^{2}}$
N维空间的两个点A (X1N, Y1N)和B (X2N, Y2N)。
$d(A, B)=\sum_{i=1}^{N}\left|X_{2 i}-X_{1 i}\right|+\sum_{i=1}^{N}\left|Y_{2 i}-Y_{1 i}\right|$
采用留一交叉验证[20], 该方法是将数据训练集中的每一个样本都作为单独的验证集, 而其余的样本作为训练集进行模型训练。将随机选择2/3的样本用于训练集, 1/3的样本用于测试集。总样本数408个, 其中训练集样本为271个, 测试集137个, 详见表1
采集5个省共408个样本的近红外光谱图, 由图1可以看出, 5个产地的油莎豆官能团出峰位置在谱图上非常接近, 共有特征峰的波长为4212.2236、4289.3706、4505.3823、4983.6934、5384.8579、5739.7730、7359.8203 cm-1等, 分别对应C-H伸缩振动、C-H伸缩振动或N-H伸缩振动、C-H相关的振动、O-H伸缩振动或C-H伸缩振动、C-H伸缩振动或N-H伸缩振动、C-H伸缩振动或O-H伸缩振动、C-H或N-H伸缩振动等, 样品出峰位置基本一致, 仅仅依靠肉眼无法实现区分, 这可能是由于不同产地油莎豆化学组成非常相似, 另外人为操作不当、仪器误差等都会对光谱产生影响, 样品的近红外光谱信号也会受到杂散光、噪声、基线漂移等因素影响, 以至于最后分析结果较差[21]。因此, 在运用近红外光谱联合化学计量学判别模型进行分析之前, 选择分析波长9000~4000 cm-1, 需要对原始近红外光谱图进行预处理, 即采用数学统计的方法消除或减弱一些干扰因素对光谱的影响, 以便于更好的对近红外光谱进行解析说明, 以此提高模型分析的可靠性和准确性。
将原始光谱数据导入Chempattern软件中, 分为训练组和测试组, 支持向量机(support vector machine, SVM)[22]、簇类独立分类(soft independent modeling of class analogy, SIMCA)[23]、正交偏最小二乘判别(orthogonal partial least squares discriminant analysis, OPLS-DA)[24]、偏最小二乘判别(partial least squares discriminant analysis, PLS-DA)[25]和KNN[26]等5种识别模式对油莎豆产地溯源建模, 具体操作如下: 分别把河北样本赋值为1, 湖南样本赋值为2, 山东样本赋值为3, 新疆样本赋值为4, 云南样本赋值为5, 即测定值位于赋值区间, 就把该样品产地归类到赋值的省份, 详见图2。5种模型训练集识别率详见表2,在红外谱图未经光谱预处理情况下, 数据预处理为自动标度化, 5种模式训练集识别效果不一, 训练集识别率最好的是KNN, 其次是SIMCA, OPLS-DA建模识别效果最差, 其中支持向量机建模识别率为91.89%, SIMCA识别率为94.47%, OPLS-DA和PLS-DA识别率偏低, 可能原因模型样品中没有存在很好的线性关系, PLS-DA属于多元线性识别方法, 不能很好地解决非线性问题, PLS-DA模式更适合基中红外光谱的不同省份样品的识别[27]。采用留一交叉验证方法, 确定KNN的k值参数为2, KNN训练集识别率为100.00%, 验证集识别率为100.00%。KNN模式取得更好识别结果的原因可能是近红外光谱峰重叠和噪声干扰, 造成了近红外数据存在严重的非线性, 而KNN分类算法是一种惰性机器学习算法, 具备增量学习特性, 适用于非线性分类问题[28]。另外, KNN模式已在茉莉花、大米识别中取得很好效果[29-30], 本研究中KNN也被选为油莎豆产地溯源识别模式。
选择KNN作为识别模式, 选择MSC、SNV和SNV+Detrending等3种光谱预处理方式和1种未经处理方式, 研究了不同光谱预处理对模型识别率影响, 结果表明, SNV+Detrending光谱预处理方式对模式识别率结果最小, 其他处理方式对KNN模型识别率影响一致, 见表3
KNN模式下, 选择MSC作为光谱预处理方式, 比较5种数据预处理对模型的影响, 由表4可知, 5种数据预处理对河北、湖南和云南的识别率能达到100.00%, 整体而言, 均一化的数据前处理会降低模型识别率, 其他4项识别结果一致。在优化模型数据预处理时, 可以优选UV标度化、Pareto标度化、自动标度和中心化中任一种数据预处理方式。
KNN模式下, 选择MSC为光谱预处理方式, 比较了欧式距离和街区距离等样本距离对模型识别结果, 由表4表5可知, 在相同条件下, 街区距离对模型识别率影响较大, 能显著提高识别率, 除了均一化条件外, 其他4种数据预处理都能达到100.00%。有研究表明, 在各种k值下, 街区距离能很好反映最低均方根误差(root mean square error, RMSE)的表现, 街区对异常值的敏感性较低, 街区距离对异常值的鲁棒性较强, 而欧氏距离在计算时会受到极端值的显著影响。因此, 在包含异常值的数据集中, 使用街区距离可能会导致更低的RMSE, 而对小规模行为的敏感性则高于欧式距离函数[31]
KNN模式下, 选择172个样本作为测试集, 验证模型识别准确率, 模型参数选择光谱前处理为MSC, 数据预处理为自动标度化, 样本距离为街区距离, k值为2, 所有测试集和训练集分类结果一致, 识别效果良好, 整体模型预测识别结果为100.00%, 识别结果见图3。通过比较5种模式训练集下的ROC曲线(图4), 计算出SVM、SIMCA、OPLS-DA、PLS-DA和KNN的AUC值, 分别为0.95、0.92、0.52、0.60、1.00, 表明基于训练样本所建立的算法模型在油莎豆产地分类中具有较好的性能。
近红外光谱结合化学计量学软件, 对河北、湖南、山东、新疆和云南等5个省份油莎豆进行产地溯源研究, 确定了KNN为产地溯源识别模型, 优化该模式算法的参数, 确定最优模型参数为: 光谱预处理方式选择MSC, 数据预处理方式UV标度化、Pareto标度化、自动标度化或中心化中任一种, 样本距离选择街区距离, 模型识别率都能达到100.00%。KNN模式下样本距离中街区距离要优于其他距离识别效果, 涉及到算法机制需要后续深入研究。近红外光谱结合KNN模式的技术用于油莎豆产地溯源, 极大提高光谱的数据处理与建模分析水平, 这种技术具有分析速度快、操作简单、样本预处理容易、无损、在线的定性定量分析等优点, 具有一定应用前景。
  • 中央级公益性科研院所基本科研业务费项目(JY2408)
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doi: 10.19812/j.cnki.jfsq11-5956/ts.20241121001
  • 接收时间:2024-11-21
  • 首发时间:2025-07-21
  • 出版时间:2025-02-25
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  • 收稿日期:2024-11-21
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中央级公益性科研院所基本科研业务费项目(JY2408)
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    1.国家粮食和物资储备局科学研究院, 北京 100037
    2.北京农学院食品科学与工程学院, 北京 102200

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* 杨永坛(1971—), 男, 博士, 研究员, 主要研究方向为食品加工与安全。E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

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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