本文主要研究内容
作者王颖(2019)在《基于固相微萃取的全二维气相色谱/飞行时间质谱测定梨果挥发性香气物质》一文中研究指出:梨果挥发性香气物质分析对于梨果的香气育种、采收、病害防治以及贮藏加工有着重要意义。但是香气易挥发、易破坏且成分复杂,这为挥发性香气物质的提取、鉴定增加了难度。因此,本文围绕基于固相微萃取-全二维气相色谱/飞行时间质谱测定梨果挥发性香气物质这一课题,研究梨果挥发性香气物质的提取及鉴定方法,用以提高梨果挥发性香气物质检测的准确性。(1)以固相微萃取(Solid-Phase Microextraction,SPME)提取,通过气相色谱-质谱联用(Gas Chromatography-Mass Spectrometry,GC-MS)鉴定,对五种品系梨果挥发性香气物质做了研究。研究中考虑到萃取头类型、萃取温度、时间对萃取结果的影响,通过对白梨品系金川雪梨和秦酥挥发性香气物质的SPME条件优化,确立了梨果挥发性香气物质的SPME-GC-MS分析条件。SPME的最佳萃取条件为:50/30μm DVB/CAR/PDMS萃取头,40℃,萃取40min。进行可行性鉴定:各物质在5-200 mg/L的范围内线性良好,相关系数R2均大于0.99,各物质的最小检出限小于2.44×10-3ng;添加回收试验中,各标准物质在梨块中添加回收率为89.3%-101.4%,相对标准偏差为1.6%-7.9%,满足挥发性香气物质分析要求。考虑到不同品系不同品种梨果挥发性香气物质种类与含量不同,将已建立的条件应用于不同品系梨果挥发性香气物质的检测分析,探讨不同品系梨果的主要挥发性香气物质。砂梨中醛、醇类相对含量较高;秋子梨和西洋梨中酯类、烯烃类数量和相对含量均较高;冷藏过程中,库尔勒香梨中各类挥发性香气物质均受到不同程度的影响。贮藏60天以后,酯类所占比例显著下降,对梨果香气品质贡献不大的烯烃、烷烃和其他类物质所占比例显著提高。(2)选取香气浓郁的南果梨,用SPME提取其挥发性香气物质,全二维气相色谱/飞行时间质谱(Comprehensive two-dimensional gas chromatography/Time-of-flight mass spectrometry,GC×GC-TOFMS)鉴定分析。进一步优化全二维的程序升温、采集电压值、分流比和调制周期等条件,确定GC×GC-TOFMS全谱扫描分析条件。GC×GC-TOFMS的最佳解析条件为:升温速率为5℃/min,电压值为1450V,分流比1:10为最优分流比,调制周期为3 s,2-壬酮内标浓度为10 mg/L。南果梨样品重复三次,得到的主要挥发性香气物质含量的RSD均小于20%,满足分析条件。用已优化的GC×GC-TOFMS条件,测定南果梨挥发性香气物质,进而探究全二维气相色谱/飞行时间质谱的优势。将GC×GC-TOFMS测得的结果与GC-MS、GC-TOFMS比对分析,发现GC×GC-TOFMS测得的南果梨挥发性香气物质数量最多。用SPME-GC×GC-TOFMS在南果梨检出以酯类、烯烃类、醇类和醛类为主的挥发性香气物质共133种。本文通过建立优化梨果挥发性香气物质的提取及鉴定方法,以期准确测定梨果的香气,为梨果的鲜食、贮藏、深加工提供数据支持。
Abstract
li guo hui fa xing xiang qi wu zhi fen xi dui yu li guo de xiang qi yo chong 、cai shou 、bing hai fang zhi yi ji zhu cang jia gong you zhao chong yao yi yi 。dan shi xiang qi yi hui fa 、yi po huai ju cheng fen fu za ,zhe wei hui fa xing xiang qi wu zhi de di qu 、jian ding zeng jia le nan du 。yin ci ,ben wen wei rao ji yu gu xiang wei cui qu -quan er wei qi xiang se pu /fei hang shi jian zhi pu ce ding li guo hui fa xing xiang qi wu zhi zhe yi ke ti ,yan jiu li guo hui fa xing xiang qi wu zhi de di qu ji jian ding fang fa ,yong yi di gao li guo hui fa xing xiang qi wu zhi jian ce de zhun que xing 。(1)yi gu xiang wei cui qu (Solid-Phase Microextraction,SPME)di qu ,tong guo qi xiang se pu -zhi pu lian yong (Gas Chromatography-Mass Spectrometry,GC-MS)jian ding ,dui wu chong pin ji li guo hui fa xing xiang qi wu zhi zuo le yan jiu 。yan jiu zhong kao lv dao cui qu tou lei xing 、cui qu wen du 、shi jian dui cui qu jie guo de ying xiang ,tong guo dui bai li pin ji jin chuan xue li he qin su hui fa xing xiang qi wu zhi de SPMEtiao jian you hua ,que li le li guo hui fa xing xiang qi wu zhi de SPME-GC-MSfen xi tiao jian 。SPMEde zui jia cui qu tiao jian wei :50/30μm DVB/CAR/PDMScui qu tou ,40℃,cui qu 40min。jin hang ke hang xing jian ding :ge wu zhi zai 5-200 mg/Lde fan wei nei xian xing liang hao ,xiang guan ji shu R2jun da yu 0.99,ge wu zhi de zui xiao jian chu xian xiao yu 2.44×10-3ng;tian jia hui shou shi yan zhong ,ge biao zhun wu zhi zai li kuai zhong tian jia hui shou lv wei 89.3%-101.4%,xiang dui biao zhun pian cha wei 1.6%-7.9%,man zu hui fa xing xiang qi wu zhi fen xi yao qiu 。kao lv dao bu tong pin ji bu tong pin chong li guo hui fa xing xiang qi wu zhi chong lei yu han liang bu tong ,jiang yi jian li de tiao jian ying yong yu bu tong pin ji li guo hui fa xing xiang qi wu zhi de jian ce fen xi ,tan tao bu tong pin ji li guo de zhu yao hui fa xing xiang qi wu zhi 。sha li zhong quan 、chun lei xiang dui han liang jiao gao ;qiu zi li he xi xiang li zhong zhi lei 、xi ting lei shu liang he xiang dui han liang jun jiao gao ;leng cang guo cheng zhong ,ku er le xiang li zhong ge lei hui fa xing xiang qi wu zhi jun shou dao bu tong cheng du de ying xiang 。zhu cang 60tian yi hou ,zhi lei suo zhan bi li xian zhe xia jiang ,dui li guo xiang qi pin zhi gong suo bu da de xi ting 、wan ting he ji ta lei wu zhi suo zhan bi li xian zhe di gao 。(2)shua qu xiang qi nong yu de na guo li ,yong SPMEdi qu ji hui fa xing xiang qi wu zhi ,quan er wei qi xiang se pu /fei hang shi jian zhi pu (Comprehensive two-dimensional gas chromatography/Time-of-flight mass spectrometry,GC×GC-TOFMS)jian ding fen xi 。jin yi bu you hua quan er wei de cheng xu sheng wen 、cai ji dian ya zhi 、fen liu bi he diao zhi zhou ji deng tiao jian ,que ding GC×GC-TOFMSquan pu sao miao fen xi tiao jian 。GC×GC-TOFMSde zui jia jie xi tiao jian wei :sheng wen su lv wei 5℃/min,dian ya zhi wei 1450V,fen liu bi 1:10wei zui you fen liu bi ,diao zhi zhou ji wei 3 s,2-ren tong nei biao nong du wei 10 mg/L。na guo li yang pin chong fu san ci ,de dao de zhu yao hui fa xing xiang qi wu zhi han liang de RSDjun xiao yu 20%,man zu fen xi tiao jian 。yong yi you hua de GC×GC-TOFMStiao jian ,ce ding na guo li hui fa xing xiang qi wu zhi ,jin er tan jiu quan er wei qi xiang se pu /fei hang shi jian zhi pu de you shi 。jiang GC×GC-TOFMSce de de jie guo yu GC-MS、GC-TOFMSbi dui fen xi ,fa xian GC×GC-TOFMSce de de na guo li hui fa xing xiang qi wu zhi shu liang zui duo 。yong SPME-GC×GC-TOFMSzai na guo li jian chu yi zhi lei 、xi ting lei 、chun lei he quan lei wei zhu de hui fa xing xiang qi wu zhi gong 133chong 。ben wen tong guo jian li you hua li guo hui fa xing xiang qi wu zhi de di qu ji jian ding fang fa ,yi ji zhun que ce ding li guo de xiang qi ,wei li guo de xian shi 、zhu cang 、shen jia gong di gong shu ju zhi chi 。
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论文作者分别是来自齐鲁工业大学的王颖,发表于刊物齐鲁工业大学2019-08-27论文,是一篇关于梨果论文,挥发性香气物质论文,固相微萃取论文,全二维气相色谱论文,飞行时间质谱论文,齐鲁工业大学2019-08-27论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自齐鲁工业大学2019-08-27论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。
标签:梨果论文; 挥发性香气物质论文; 固相微萃取论文; 全二维气相色谱论文; 飞行时间质谱论文; 齐鲁工业大学2019-08-27论文;