色谱
色譜
색보
CHINESE JOURNAL OF CHROMATOGRAPHY
2014年
4期
433-437
,共5页
彭俏容%唐涛%于淑新%孙元社%雷武%王风云%张维冰%李彤
彭俏容%唐濤%于淑新%孫元社%雷武%王風雲%張維冰%李彤
팽초용%당도%우숙신%손원사%뢰무%왕풍운%장유빙%리동
冷冻熔炼液-液萃取%气相色谱法%N-二甲基亚硝胺%啤酒
冷凍鎔煉液-液萃取%氣相色譜法%N-二甲基亞硝胺%啤酒
냉동용련액-액췌취%기상색보법%N-이갑기아초알%비주
frozen zone melting liquid-liquid extraction%gas chromatography ( GC )%N-nitrosodimethylamine%beer
建立了一种新型的冷冻熔炼液-液萃取法直接提取啤酒中的 N-二甲基亚硝胺( N-nitrosodimethylamine, NDMA),萃取液经 GC-FID 分析,双柱法定性,外标法定量。优化的前处理条件为:以二氯甲烷为萃取溶剂,啤酒样品和萃取溶剂的体积比为9:1,-19℃下冷冻16 h。结果表明:NDMA 在5~200 mg / L 范围内具有良好的线性关系(r2=0.9996);在5、10和20 mg / L 3个加标水平下的回收率分别为84.94%、83.24%、85.14%,平行7次测定的相对标准偏差(RSD)分别为3.06%、3.19%、2.63%。与常规液-液萃取方法(需要经过蒸馏、萃取、旋蒸、氮吹4个步骤)相比,本方法稳定、可靠,且操作简单,有机溶剂消耗量少。
建立瞭一種新型的冷凍鎔煉液-液萃取法直接提取啤酒中的 N-二甲基亞硝胺( N-nitrosodimethylamine, NDMA),萃取液經 GC-FID 分析,雙柱法定性,外標法定量。優化的前處理條件為:以二氯甲烷為萃取溶劑,啤酒樣品和萃取溶劑的體積比為9:1,-19℃下冷凍16 h。結果錶明:NDMA 在5~200 mg / L 範圍內具有良好的線性關繫(r2=0.9996);在5、10和20 mg / L 3箇加標水平下的迴收率分彆為84.94%、83.24%、85.14%,平行7次測定的相對標準偏差(RSD)分彆為3.06%、3.19%、2.63%。與常規液-液萃取方法(需要經過蒸餾、萃取、鏇蒸、氮吹4箇步驟)相比,本方法穩定、可靠,且操作簡單,有機溶劑消耗量少。
건립료일충신형적냉동용련액-액췌취법직접제취비주중적 N-이갑기아초알( N-nitrosodimethylamine, NDMA),췌취액경 GC-FID 분석,쌍주법정성,외표법정량。우화적전처리조건위:이이록갑완위췌취용제,비주양품화췌취용제적체적비위9:1,-19℃하냉동16 h。결과표명:NDMA 재5~200 mg / L 범위내구유량호적선성관계(r2=0.9996);재5、10화20 mg / L 3개가표수평하적회수솔분별위84.94%、83.24%、85.14%,평행7차측정적상대표준편차(RSD)분별위3.06%、3.19%、2.63%。여상규액-액췌취방법(수요경과증류、췌취、선증、담취4개보취)상비,본방법은정、가고,차조작간단,유궤용제소모량소。
A simple and effective sample enrichment method of frozen zone melting liquid-liquid extraction was optimized and validated for the analysis of trace N-nitrosodimethylamine (NDMA)in beer samples. The method was based on high pressure liquid-liquid extraction with a low temperature frozen step. The 90 mL beer was placed in a container with 10 mL dichlo-romethane. After agitation,the sample was kept in a freezer for 16 h at - 19 ℃ . The organic extract was analyzed by gas chromatography with a flame ionization detector( GC-FID). The accuracy,precision,detection and quantification limits and linearity of the method were evalu-ated. The results showed that the calibration curve of NDMA was linear in the range of 5-200 mg / L with a good correlation coefficient(r 2 )of 0. 999 6. The recoveries at the spiked levels of 5,10 and 20 mg / L were 84. 94% ,83. 24% ,85. 14% with the relative standard deviations(n = 7) of 3. 06% ,3. 19% ,2. 63% ,respectively. The ordinary extraction method of N-nitrosodimethyl-amine in beer includes the four steps of low-temperature distillation,liquid-liquid extraction, rotary evaporation and nitrogen blowing concentration. With the extremely low volume of sol-vent used,the proposed extraction method proved to be easy and simple,and adequate for high-throughput analysis at low cost.