天堂国产午夜亚洲专区-少妇人妻综合久久蜜臀-国产成人户外露出视频在线-国产91传媒一区二区三区

氣泡微萃取-氣相色譜-質(zhì)譜法測(cè)定尿中咖啡因

發(fā)布時(shí)間:2018-01-22 06:45

  本文關(guān)鍵詞: 氣泡微萃取 咖啡因 氣相色譜/質(zhì)譜 尿 出處:《分析化學(xué)》2017年05期  論文類型:期刊論文


【摘要】:建立了氣泡微萃取結(jié)合氣相色譜/質(zhì)譜技術(shù)(GC-MS)測(cè)定尿中咖啡因的方法。對(duì)影響萃取效率的實(shí)驗(yàn)條件進(jìn)行了優(yōu)化,確定了最佳萃取條件:三氯甲烷作為萃取溶劑,萃取溶劑暴露體積1μL,氣泡體積1.6μL,攪拌速度300 r/min,萃取時(shí)間5 min,鹽度15%(m/V),氣泡與磁子間距離1 cm。在優(yōu)化條件下,所建立方法在咖啡因濃度0.005~10 mg/L范圍內(nèi)有較好的線性關(guān)系,相關(guān)系數(shù)可達(dá)0.986,檢出限為0.003 mg/L。在人尿液中添加不同濃度的咖啡因(0.050、0.500和5.000 mg/L),回收率為89.2%~107.5%,相對(duì)標(biāo)準(zhǔn)偏差小于8%(n=6)。
[Abstract]:A method for determination of caffeine in urine by gas chromatography / mass spectrometry (GC / MS) with bubble microextraction was established and the experimental conditions affecting the extraction efficiency were optimized. The optimum extraction conditions were determined as follows: trichloromethane as extraction solvent, solvent exposure volume 1 渭 L, bubble volume 1.6 渭 L, stirring speed 300r / min, extraction time 5 min. Under the optimized conditions, the established method has a good linear relationship in the range of 0.005 ~ 10 mg/L of caffeine concentration, and the distance between the bubble and the magneton is 1 cm 路m ~ (-1), the salinity is 15 cm / V ~ (-1), and the distance between the bubble and the magneton is 1 cm. The correlation coefficient was 0.986, the detection limit was 0.003 mg / L. Different concentrations of caffeine were added to human urine (0.050 mg / L and 5.000 mg / L). The recovery was 89. 2% and 107.5%, and the relative standard deviation was less than 8%.
【作者單位】: 甘肅政法學(xué)院公安技術(shù)學(xué)院;蘭州軍區(qū)農(nóng)業(yè)新技術(shù)試驗(yàn)培訓(xùn)基地;
【基金】:國(guó)家自然科學(xué)基金(No.21565005) 甘肅省自然科學(xué)基金(No.1506RJZA033) 蘭州市科技計(jì)劃(No.2016-3-36)資助項(xiàng)目~~
【分類號(hào)】:R446.12;O657.63
【正文快照】: 1引言咖啡因(Caffeine)是一種嘌呤類生物堿,即1,3,7-三甲基黃嘌呤,屬中樞神經(jīng)系統(tǒng)興奮劑,適量攝入能夠緩解疲勞、振奮精神、提高注意力[1,2,],被廣泛用作食品添加劑[3]。同時(shí),咖啡因也是一種毒品,不當(dāng)使用會(huì)造成上癮、神經(jīng)過(guò)敏和睡眠紊亂等不良反應(yīng),嚴(yán)重者甚至?xí)䦟?dǎo)致中毒或死

【相似文獻(xiàn)】

相關(guān)期刊論文 前3條

1 劉宏程;黎其萬(wàn);;QuEChERS方法測(cè)定食用菌中尼古丁[J];分析科學(xué)學(xué)報(bào);2012年01期

2 姚祖鳳,周亮成,劉家欣;湘西辣蓼揮發(fā)油化學(xué)成分的研究[J];天然產(chǎn)物研究與開(kāi)發(fā);1999年02期

3 ;[J];;年期

相關(guān)會(huì)議論文 前1條

1 曲剛蓮;馬果花;劉國(guó)宏;潘榮榮;;未知樣品六六六的確認(rèn)[A];中國(guó)化學(xué)會(huì)第26屆學(xué)術(shù)年會(huì)分析化學(xué)分會(huì)場(chǎng)論文集[C];2008年

,

本文編號(hào):1453984

資料下載
論文發(fā)表

本文鏈接:http://sikaile.net/linchuangyixuelunwen/1453984.html


Copyright(c)文論論文網(wǎng)All Rights Reserved | 網(wǎng)站地圖 |

版權(quán)申明:資料由用戶1744f***提供,本站僅收錄摘要或目錄,作者需要?jiǎng)h除請(qǐng)E-mail郵箱bigeng88@qq.com