期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Determination of volatile profiles inside apple fruit storage facilities using Monotrap^(TM)monolithic silica adsorbent and GC-MS
1
作者 Cuihua Liu Xiaoran Liu +5 位作者 Xiaoning Tian Jing Zhang Zhanfeng Zhang jinrui shi Juan Xu Xiaolin Ren 《Horticultural Plant Journal》 SCIE CSCD 2021年第4期267-274,共8页
The interior atmosphere of storage facilities is very important for maintaining fruit quality and delaying senescence,so it’s of significance to determine the volatile profiles in this environment for the postharvest... The interior atmosphere of storage facilities is very important for maintaining fruit quality and delaying senescence,so it’s of significance to determine the volatile profiles in this environment for the postharvest industry.However,volatile profiles inside fruit storage facilities have been rarely reported.To study the volatile profiles of the atmosphere inside fruit storage facilities,a method comprising Monotrap^(TM)adsorbent and GC–MS analysis in the study was developed and tested.Based on that,the volatile profiles in the atmosphere inside fruit storage facilities at four locations in Shaanxi Province were monitored.Altogether thirty-six volatiles were detected,and most of them were identified as esters.An analysis of the similarities of volatile profiles showed that the three storage rooms at each location clustered together.The storage rooms at two locations in Baoji had the most similar volatile profiles,and both were similar to that at Xianyang,but different from that at Yan’an,which were consistent with their geographic distributions.On the basis of a principal component analysis,heatmap dendrogram,and correlation matrix analysis,these compounds clustered into five groups.Compounds in Group 1,which were abundant in the storage room at Yan’an,were branched-chain esters,whereas the compounds in the other four groups were mainly straight-chain esters which were abundant in the storage rooms at Xianyang and Baoji.The difference among volatile profiles inside fruit storage facilities at four locations might be caused by ultraviolet radiation.In this study,we demonstrated the Monotrap^(TM)adsorbent and GC–MS analysis were an efficient method for volatile compounds detection inside fruit storage facilities. 展开更多
关键词 APPLE MonoTrap^(TM)adsorbent VOLATILE Storage environment ESTER
下载PDF
基于GC-QTOF构建挥发性有机物的非靶标筛查方法 被引量:4
2
作者 乔显亮 施锦瑞 +3 位作者 谢晴 陈景文 孙畅 刘远 《科学通报》 EI CAS CSCD 北大核心 2020年第26期2922-2930,共9页
挥发性有机物(volatile organic compounds, VOCs)是一类影响大气质量的重要污染物,对生态安全与人体健康都具有重要影响. VOCs种类众多,全面的环境监测存在很大的技术挑战.本研究从环境空气样品中VOCs的定性筛查出发,采用气相色谱-四... 挥发性有机物(volatile organic compounds, VOCs)是一类影响大气质量的重要污染物,对生态安全与人体健康都具有重要影响. VOCs种类众多,全面的环境监测存在很大的技术挑战.本研究从环境空气样品中VOCs的定性筛查出发,采用气相色谱-四级杆飞行时间串联质谱(GC-QTOF)建立了一套VOCs的非靶标筛查方法,其主要流程如下:(1)在70 eV下对样品中VOCs进行分析,将获得的质谱图与仪器配套的谱图库比对,筛选出可能的候选物;(2)在15 eV条件下获取分子离子峰,根据候选物分子离子的准确度误差<5 ppm(parts per million)作为阈值鉴定化合物;(3)如果分子中涉及同位素元素,进行质谱同位素分析;(4)使用保留时间预测模型,进一步辅助识别;(5)使用标准样品对识别的VOCs进行确证.采用108种VOCs进行非靶标筛查流程测试发现, 94种可以被正确识别,准确率为87%,显著高于采用GC-MS分析和谱库对比的识别率58%.对大连某企业环境大气中的VOCs进行了采样分析,筛查出30种VOCs,其中有23种通过标准样品确认,初步说明本研究构建的非靶标筛查方法可以作为环境大气中未知VOCs定性识别的技术工具.在后续研究中,将进一步对非靶标筛查方法进行环境样品分析验证和完善优化. 展开更多
关键词 挥发性有机物 高分辨质谱 非靶标筛查 环境监测
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部