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气相色谱-质谱联用法测定食品中3-氯丙醇酯及缩水甘油酯 总被引:1,自引:0,他引:1
建立了气相色谱-质谱联用同时测定多种植物油和油脂类食品中3-氯丙醇酯(3-MCPDE)和缩水甘油酯(GE)的检测方法。通过对样品提取、酯交换、衍生化和GC-MS检测条件的优化,植物油、奶粉、油炸膨化类食品以及焙烤类食品中3-MCPDE的定量下限分别为100、25、125、20μg/kg。方法的平均回收率为81.2%~109%,相对标准偏差(RSD,n=6)为0.77%~7.3%,样品在较宽的线性范围内呈良好线性关系,相关系数(r)大于0.999。采用该方法对30个食品样品进行了检测,其中3-MCPDE和GE的检出含量范围为未检出~8.04mg/kg。该法具有高效、灵敏和可操作性强等特点,能够满足日常食品,特别是油脂和油脂食品中3-MCPDE和GE的定性及定量检测要求。 相似文献
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气相色谱和气相色谱-质谱法测定食品中乙草胺残留 总被引:3,自引:0,他引:3
建立了气相色谱和气相色谱-质谱法检测10种植物源性和动物源性食品中乙草胺残留量检测方法.粮谷类和动物源性样品采用乙腈提取,GPC结合硅胶固相萃取柱净化;蔬菜类样品采用乙酸乙酯提取、硅胶固相萃取柱净化;元葱等样品先进行微波消解,然后采用乙酸乙酯提取,硅胶固相萃取柱净化.气相色谱和气相色谱-质谱联用法检测.两种方法检出限均为0.004 mg/kg; 在0.01~0.16 mg/L范围内均呈良好的线性关系,相关系数为0.9998和0.9997;在0.01、0.02和0.05 mg/kg的添加水平下,添加回收率在70%~102%之间;相对标准偏差(RSD)均小于10%. 相似文献
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提出了气相色谱-质谱法测定食品中16种邻苯二甲酸酯(PAE′s)含量的方法。详细叙述了不同基质的食品的处理方法,高脂类样品需经凝胶渗透色谱净化。采用HP-5MS石英毛细管柱进行分离和电子轰击离子源质谱检测。16种PAE′s的线性范围为0.50~20.0mg·L-1,检出限(3S/N)在6.03~826μg·kg-1之间。在1,10mg·kg-1两个浓度水平进行加标回收试验,纯油脂和高脂固体样品中16种PAE′s的平均回收率分别在79.2%~101%和77.8%~97.4%之间,测定值的相对标准偏差(n=6)分别在3.4%~6.9%和4.1%~6.0%之间。 相似文献
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建立了气相色谱法检测面包中3种单甘油酯(单辛酸甘油酯、单癸酸甘油酯和单月桂酸甘油脂)含量的分析方法。样品以二氯甲烷-正己烷(1∶1)提取,提取液经浓缩后,用正己烷饱和乙腈萃取,气相色谱测定,外标法定量。3种单甘油酯在20~1000mg/L范围内呈良好线性,相关系数(r)大于0.999。3种单甘油酯的定量下限分别为35.2、23.3、12.8mg/kg,加标回收率为81.1%~95.7%,相对标准偏差(RSD)为2.9%~8.8%。该法操作简便、灵敏度高、重现性和选择性好,可用于面包中3种单甘油酯的检测。 相似文献
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建立了气相色谱测定食品中丙酸及丙酸盐的分析方法。针对含油脂和不含油脂的食品,分别建立了脱脂提取法和直接提取法。考察不同pH值对丙酸溶解性和加标回收率的影响,通过对净化条件、pH值、提取剂的种类和提取次数等条件的优化,确定最佳处理条件为:样品加盐酸溶液调节pH≤2,用5 mL正己烷脱脂,用5 mL乙酸乙酯提取2次,合并提取液,使用HP-INNOWAX毛细管色谱柱对丙酸进行分离,用氢火焰离子化检测器检测,外标法定量。结果表明,使用脱脂提取法得到丙酸的回收率为87.5%~97.6%,相对标准偏差为3.09%~6.86%(n=6);使用直接提取法得到丙酸的平均回收率为90.1%~102.1%,相对标准偏差为3.32%~6.33%(n=6)。两种方法的线性范围为2~1 000 mg/L(相关系数为0.999 8),检出限为0.003 g/kg,定量限为0.01 g/kg。方法适用于多种食品中丙酸的检测,具有准确、快速、简便、灵敏度高等优点,为食品中丙酸含量的测定提供了新途径。 相似文献
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Effect of chain length distribution on the phase behavior of polyglycerol fatty acid ester in water 总被引:1,自引:0,他引:1
The effect of the chain length distribution on the phase behavior, the structure of liquid crystals, and physicochemical
properties was investigated in water/ polyglycerol fatty acid ester. Polyglycerol fatty acid esters with sharply distributed
polyglycerol (10G*0.7L) and with broadly distributed polyglycerol (10G0.7L) were used. Unreacted polyglycerol in both surfactants
was removed. 10G*0.7L forms hexagonal liquid crystals at a higher concentration than 10G0.7L. The effective cross-sectional
area of the lipophilic parts in the hexagonal phase of 10G0.7L is smaller than that of 10G*0.7L owing to the difference in
the chain length distribution. Evidently, 10G0.7L molecules are tightly packed in aggregates; therefore, 10G0.7L decreased
the surface tension more strongly and promoted emulsification.
Received: 11 January 2000 Accepted: 8 March 2000 相似文献
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The Ammi majus seeds oil constituents of methyl ester derivatives of fatty acids were analyzed using Gas Chromatography coupled to mass spectrometer. The results obtained containing the saturated as well as unsaturated fatty acids of majus seeds oils. A total of 18 different components were identified and quantified. Methyl ester of linoleic acid was found in high concentration 9.00%, among the identified analytes of interest. In addition methyl ester of Oleic acid 5.60%, Palmitic acid 3.98% Linolenic acids 1.42% were found. Concentration of the rest of identified fatty acids analytes were less than 1%. Thus from the results it is apparent that due to the presence of high percentage of valuable analytes concentrations detected in the fatty acid of A. majus, has increased its importance for the consumption in the pharmaceuticals as well as its applications in the new formulations for various skin diseases to prevent and cure from different infections. 相似文献
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气相色谱法同时测定涂料中的苯系物和邻苯二甲酸酯类环境激素 总被引:11,自引:0,他引:11
建立了涂料中苯、甲苯、二甲苯异构体、邻苯二甲酸酯类化合物(DEP、DBP、BBP、DEHP、DNOP)多种有毒有害成分同时检测技术 ;用化学和吸附/脱附惰性膜除去样品中的大部分树脂成膜物质、颜填料及各种微粒助剂 ;用毛细管柱气相色谱分离 ,内标法定量 ;苯系物的线性范围为1×10-2~100μg,邻苯二甲酸酯类增韧剂为5×10-2~20μg;苯系物的回收率为97 %~103 % ,相对标准偏差 (RSD)的范围为0.12 %~0.95 % ;邻苯二甲酸酯类增韧剂的回收率为96 %~102 % ,相对标准偏差 (RSD)的范围为0.92 %~2.46 %。结果表明 :该方法简便、快速、灵敏、精密度好。 相似文献
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A technique of ultrasound-assisted low density solvent based dispersive liquid-liquid microextraction was developed for the determination of four phthalate esters, including dimethyl phthalate(DMP), diethyl phthalate(DEP), di-n-butyl phthalate(DnBP) and di(2-ethylhexyl) phthalate(DEHP) in bottled water samples. A low density solvent, toluene, was selected as extraction solvent. In the extraction process, a mixture of 15 μL of toluene(extraction solvent) and 100 μL of methanol(disperser solvent) was rapidly injected into 1.0 mL of water samples. A cloudy solution was formed after ultrasounded for 5 min, and then centrifuged at 5000 r/min for 5 min. The enriched analytes in the floating phase were determined by means of gas chromatograph. Under the optimum conditions, the enrichment factors were found to be in a range of 29-67, and the recoveries were ranged from 81.2% to 103.9%. The limits of the detection were in a range of 3.8-5.6 μg/L. The proposed method was applied to the extraction and determination of phthalate esters in bottled water samples, and the concentrations of phthalate esters found in the water samples were below the allowable levels. 相似文献
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Separations of polyglycerol esters containing 3–5 hydroxyl groups and of their silyl derivatives are demonstrated on DB-1 and DB-17 columns. Useful chromatograms are produced in every case. However, the chromatograms are improved on derivatization. The extent of improvement realized increases with the number of free hydroxyl groups per molecule. 相似文献
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近两年国内气相色谱的应用进展(Ⅰ) 总被引:6,自引:0,他引:6
傅若农男,1930年出生,1953年毕业与北京大学化学系,到1998年退休前一直在北京理工大学(前身为北京工业学院)工作,1986年晋升为教授,并被国务院学位委员会评定为第三批博士生导师。多年来从事色谱分析方面的教学和研究工作,研究方向为:气相色谱和毛细管气相色谱新固定相, 相似文献
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对近两年国内各个领域的学者在气相色谱方面的研究和应用作了综述,本综述分3部分叙述,本篇为第 部分,包括:8.气相色谱在食品功效成分和其他成分分析中的应用,9.气相色谱酒分析中的应用,1 0 .气相色谱在污染物分析中的应用,1 1 .气相色谱在石油、石油化工分析中的应用,1 2 .气相色谱在化学品生产分析中的应用 相似文献
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Summary Four cyclodextrin derivatives (CDs) were synthesized by substituting 3-OH of 2,6-di-O-pentyl-β-cyclodextrin with four different
chain lengths of acyl groups (butyryl, valeryl, heptanoyl, octanoyl). The chromatographic properties of the four CD derivatives
as stationary phases of capillary gas chromatography (CGC) were investigated. These CDs exhibit a wide range of application.
Not only five pairs of enantiomers of pyrethroic acid methyl esters were separated on the four CDs, but also some other racemic
compounds. Among the four CDs, 2,6-di-O-pentyl-3-O-butyryl-β-CD possesses better enantiomer separation abilities to the studied
enantiomers of pyrethroic acid methyl esters than the other studied CDs. The extension of chain length of the acyl groups
in 3-position of CDs cannot improve the enantiomer separation abilities of the CD derivatives. 相似文献