1.宁波中盛产品检测有限公司,浙江 宁波 315040
2.宁波海关技术中心,浙江 宁波 315040
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周洁,孙骥,余晓玲等.氯丙醇双酯在四极杆/静电场轨道阱高分辨质谱中的裂解规律研究及应用[J].分析测试学报,2023,42(01):11-20.
ZHOU Jie,SUN Ji,YU Xiao-ling,et al.Study on the Fragmentation Law of Chloropropanol Diesters by Q-Orbitrap-HRMS and Its Application[J].Journal of Instrumental Analysis,2023,42(01):11-20.
周洁,孙骥,余晓玲等.氯丙醇双酯在四极杆/静电场轨道阱高分辨质谱中的裂解规律研究及应用[J].分析测试学报,2023,42(01):11-20. DOI: 10.19969/j.fxcsxb.22052502.
ZHOU Jie,SUN Ji,YU Xiao-ling,et al.Study on the Fragmentation Law of Chloropropanol Diesters by Q-Orbitrap-HRMS and Its Application[J].Journal of Instrumental Analysis,2023,42(01):11-20. DOI: 10.19969/j.fxcsxb.22052502.
通过直接采集碎片离子的高精度质量数(分辨率 ,>, 70 000,,m/z, 200),利用元素模拟得到碎片离子的元素组成,进而探究氯丙醇双酯的质谱裂解规律。结果表明:氯丙醇双酯存在以脂肪酸或酮基形式的中性丢失,形成一系列的碎裂片段:[RCH,2,COOH + H],+,,[RCH,,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42450556&type=,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42450554&type=,3.72533321,2.28600001,CO + H],+,和[*g-H,2,O],+,等,这些离子可用于鉴定脂肪酸链组成。在高碰撞能下,脂肪酸链的骨架结构形成一系列Δ = 14 u的碎片离子,质荷比分布为100 ~ 210 u。值得注意的是,氯丙醇双酯在一定的碰撞能量范围内,sn-1/3位酰基链形成的碎裂片段总大于sn-2位对应的离子碎片,该结论可实现对氯丙醇双酯酰基链位置的准确鉴定。基于上述裂解规律,在植物油中共鉴定出9种3-氯丙醇双酯,含量为(7.12 ± 0.54)~(24.24 ± 2.01) mg/kg。
The elemental composition of fragment ions was obtained by directly collecting the high precision mass number of fragment ions(resolution ,>, 70 000,,m,/,z, 200),and then the cracking laws of chloropropanol diesters were investigated by elemental simulation.Results showed that chloropropanol diesters have neutral ions in the form of fatty acids or ketoacids,forming a series of fragmentation fragments,including [RCH,2,COOH + H],+,,[RCH,,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42450632&type=,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42450630&type=,3.72533321,2.28600001,CO + H],+, and [*g-H,2,O],+,,etc,which could be used to identify the composition of fatty acyl chain. Under high collision energy,the fatty acid chain skeleton structure could also form a series of Δ = 14 u fragment ions,with a mass-charge ratio distributed between 100 u and 210 u.Notably,when chlorpropanol diesters is under a certain range of collision energy,the fragmentation fragments formed by the acyl chain at sn-1/3 are always greater than the corresponding ionic fragments at sn-2,which could realize the identification on position from the diester acyl.Nine 3-chloropropanol diesters in vegetable oil were identified,with total content from (7.12 ± 0.54) mg/kg to (24.24 ± 2.01) mg/kg.
氯丙醇双酯质谱裂解规律四极杆/静电场轨道阱高分辨质谱(Q-Orbitrap-HRMS)
chloropropanol diestermass spectrum fragmentation lawquadrupole electrostatic field orbital trap high resolution mass spectrometry(Q-Orbitrap-HRMS)
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