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基于水自由基阳离子快速检测甲醇和乙醇

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本文采用常压电晕放电电离质谱技术,开发了一种快速检测甲醇和乙醇含量的方法.基于水自由基阳离子分别与甲醇和乙醇相互作用形成相应的水自由基阳离子复合物[CH3OH+H2O]+·(m/z 50)和[CH3CH2OH+H2O]+·(m/z 64),实现了不同种类酒精饮料中甲醇和乙醇的直接快速定性与定量分析.结果表明,甲醇和乙醇的检出限分别为0.011、0.004 mg/L,定量限分别为0.038、0.014 mg/L.该方法无需样品前处理、操作简单、分析速度快,适合含水体系的检测,对复杂体系中甲醇和乙醇的定量分析具有指导意义.
Rapid Detection of Methanol and Ethanol Based on Water Radical Cation
The content of ethanol in wine can affect its quality.Some edible alcohol con-tains small amounts of methanol,and its accumulation can cause serious health prob-lems.Therefore,it is very important to test the contents of methanol and ethanol in alcohol products.In this paper,a rapid method for the determination of methanol and ethanol by ambient corona discharge ionization mass spectrometry was developed.The method is based on the interaction of water radical cation with methanol and ethanol,respectively.In the positive ion mode,the water dimer radical cation(H2O)2+·(m/z 36)with ambient corona discharge ionization source was prepared by using ambient corona discharge ionization source,and it was introduced into the mass spectrometer with methanol or ethanol through a dual-channel low-energy corona discharge ionization device.The two reacted with each other to form the corresponding water radical cationic complex[CH3 OH+H2 O]+·(m/z 50)and[CH3CH2 OH+H2O]+·(m/z 64),which realized the direct and rapid qualitative and quantitative analysis of methyl alcohol and ethanol in different kinds of alcoholic beverages.The result showed that the limits of detection and the limits of quantification of methanol and ethanol were 0.011 and 0.004 mg/L,0.038 and 0.014 mg/L,respectively.The correlation coeffi-cients of the target ionic strength curves obtained by the interaction of different concen-trations of standard methanol and ethanol with water free radical cation could reach to 0.990 4 and 0.991 1,respectively.By using this method,no methanol was detected in common alcoholic drinks,and the ethanol content in liquor was higher than beer.In the actual work,the method has good practicability through the experimental exploration and verification of different wines.This method does not require sample pretreatment,has the advantages of simple operation and fast analysis,and is especially suitable for the detection of aqueous system.This study has important guiding significance for the quantitative detection and analysis of methanol and ethanol in complex system,provides technical support for the detection of alcoholic beverages and food,and also provides an effective strategy for the quantitative detection of the content of small and medium molecular alcohols in actual samples.

water radical cationmethanolethanolalcoholic beveragesambient coro-na discharge ionization mass spectrometry

段敏敏、张小平、胡平花、袁艳春、张兴磊、陈焕文

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东华理工大学,江西省质谱科学与仪器重点实验室,江西南昌 330013

江西中医药大学药学院,江西南昌 330004

水自由基阳离子 甲醇 乙醇 含酒饮料 常压电晕放电质谱

国家自然科学基金国家自然科学基金江西省国际科技合作项目江西中医药大学校级科技创新团队发展计划江西省自然科学基金东华理工大学实践教学项目

221040142216400220203BDH80W010Cxtd2200520232BAB213047DHSY-202315

2024

10.7538/zpxb.2023.0092

质谱学报
北京中科科仪技术发展有限责任公司 中国物理学会质谱分会

质谱学报

CSTPCD北大核心EI
影响因子：1.046
ISSN：1004-2997
年,卷(期)：2024.45(1)
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