期刊文献+
共找到11篇文章
< 1 >
每页显示 20 50 100
动物源性食品兽药多残留检测中基质净化与液相色谱-质谱联用技术研究进展 被引量:6
1
作者 季宝成 杨澜瑞 +2 位作者 韩雨 白艳红 许旭 《轻工学报》 CAS 北大核心 2023年第5期8-16,共9页
对液相色谱-质谱(Liquid Chromatography-Mass Spectrometry, LC-MS)联用技术结合不同动物源基质净化技术在兽药多残留检测的研究进展及其应用状况进行了综述,指出,液-液萃取、分散液-液微萃取、固相萃取、固相微萃取、分散固相萃取、... 对液相色谱-质谱(Liquid Chromatography-Mass Spectrometry, LC-MS)联用技术结合不同动物源基质净化技术在兽药多残留检测的研究进展及其应用状况进行了综述,指出,液-液萃取、分散液-液微萃取、固相萃取、固相微萃取、分散固相萃取、磁性固相萃取技术在肉类、蛋类、奶类及其制品等不同动物源性食品中的应用较广泛,但仍存在一定程度的局限性,如液-液萃取基质选择性弱、分散液-液微萃取适用对象有限、固相萃取耗时较长、固相微萃取重现性差、分散固相萃取净化效率适中等。未来可就构建多种类兽药残留同步净化方法、开发食品源基质特异性高效净化材料及增强基质净化过程快捷、自动化程度等方面进行深入研究,以期进一步推动LC-MS联用技术在动物源性食品兽药多残留检测中的应用。 展开更多
关键词 动物源食品 兽药残留 液相色谱-谱联用 基质净化技术
下载PDF
快速基质分散净化-超快速液相色谱-串联质谱法同时测定玉米中22种三嗪类除草剂残留 被引量:20
2
作者 吴岩 赵伟 +6 位作者 刘永 姜冰 魏冬旭 勾越 李丽丽 韩峰 祖元刚 《分析化学》 SCIE EI CAS CSCD 北大核心 2016年第6期950-957,共8页
建立了玉米中扑灭津、莠去津、敌草净、特丁通等22种三嗪类除草剂多残留的分析方法。样品以乙腈为提取剂,经高速匀浆方法提取并浓缩后,以增强型脂质去除净化剂(EMR-Lipid)净化,除去了样品中的脂质,有效地降低了样品中的复杂基质所带... 建立了玉米中扑灭津、莠去津、敌草净、特丁通等22种三嗪类除草剂多残留的分析方法。样品以乙腈为提取剂,经高速匀浆方法提取并浓缩后,以增强型脂质去除净化剂(EMR-Lipid)净化,除去了样品中的脂质,有效地降低了样品中的复杂基质所带来的背景干扰,净化液再经增强型脂质去除萃取剂(EMR-Polish)盐析萃取,以Kinetex XB-C_(18)柱为分离柱,用乙腈和0.1%甲酸溶液进行梯度洗脱,电喷雾正离子(ESI+)多反应模式监测,超快度液相色谱-串联质谱(UFLC-MS/MS)测定,基质匹配标准曲线法定量。加标水平为5,10和20μg/kg时,22种农药的回收率为72%~105%,相对标准偏差小于15%。22种农药的检出限为0.16~1.8μg/kg,在1.0~50μg/L范围内线性关系良好(r〉0.993)。本方法具有快速、准确、灵敏度高等优点,能够准确测定玉米中22种三嗪类除草剂的残留量。 展开更多
关键词 去除 快速分散净化 超快速液相色谱-串联谱法 三嗪类除草剂 玉米
下载PDF
逆固相基质分散净化和气质联机检测土壤中的六氯苯残留 被引量:6
3
作者 张卢军 潘灿平 +3 位作者 郝向红 赵玉珍 马婧玮 宗伏霖 《农药学学报》 CAS CSCD 2007年第1期100-102,共3页
建立了逆固相基质分散净化和气质联机法(GC-MS)快速、简便测定土壤中六氯苯(HCB)残留量的方法。以丙酮-正己烷(1∶1,体积比)为提取剂,采用超声波萃取,经固相基质PSA(primary secondary amine)吸附净化后采用GC-MS选择离子模式检测。结... 建立了逆固相基质分散净化和气质联机法(GC-MS)快速、简便测定土壤中六氯苯(HCB)残留量的方法。以丙酮-正己烷(1∶1,体积比)为提取剂,采用超声波萃取,经固相基质PSA(primary secondary amine)吸附净化后采用GC-MS选择离子模式检测。结果表明,六氯苯在0.05~5mg/L浓度范围内呈现出较好的线性关系,相关系数R2=0.9995;方法检测限为0.3μg/kg,定量限为0.9μg/kg,在0.89、1.78、8.90mg/kg3个添加水平上的平均回收率分别为106.6%、108.2%和108.1%。用该方法测定了天津某生产厂厂区地下1~10m深的土壤样本,发现六氯苯的残留量在2.3~25912mg/kg之间,表现出显著的空间变异趋势。该方法快速、简便、经济、高效、实用并且安全,适合大批量样本中六氯苯的快速检测。 展开更多
关键词 六氯苯 联机 逆固相分散净化 土壤
下载PDF
基于壳聚糖/氧化石墨烯/硅藻土固相萃取-液相色谱串联质谱测定茶叶中多种农药残留 被引量:7
4
作者 胡高华 曹建荣 +6 位作者 杨蕾文宣 王晨 周苏娟 刘新 鲁成银 陈红平 马桂岑 《茶叶科学》 CAS CSCD 北大核心 2022年第2期249-262,共14页
利用前期合成的壳聚糖/氧化石墨烯/硅藻土固相萃取柱高效吸附茶叶基质,结合超高效液相色谱串联质谱(UPLC-MS/MS),建立了茶叶中46种农药残留的分析方法。茶叶样品经乙腈提取,固相萃取柱净化,乙腈淋洗等样品前处理,UPLC-MS/MS分析46种农... 利用前期合成的壳聚糖/氧化石墨烯/硅藻土固相萃取柱高效吸附茶叶基质,结合超高效液相色谱串联质谱(UPLC-MS/MS),建立了茶叶中46种农药残留的分析方法。茶叶样品经乙腈提取,固相萃取柱净化,乙腈淋洗等样品前处理,UPLC-MS/MS分析46种农药残留。结果表明,该新型固相萃取净化柱可以高效吸附去除茶叶基质,大大降低基质效应,绿茶、红茶和乌龙茶中农药的基质效应分别下降了4.7%~66.5%,3.2%~35.5%和4.4%~42.8%。在3个加标水平下,46种农药回收率在61.5%~118%线性良好,相关系数(R^(2))均大于0.98。所建立方法具有吸附剂用量少、省时、无需基质标准溶液、可以检测不同茶类多农残和定量限低等优点。 展开更多
关键词 壳聚糖/氧化石墨烯/硅藻土 基质净化 农药残留 茶叶 超高效液相色谱串联
下载PDF
超高效液相色谱-串联质谱法对比11种净化方式对当归中50种农药残留检测的影响 被引量:9
5
作者 刘志荣 《应用化学》 CAS CSCD 北大核心 2019年第8期968-976,共9页
采用超高效液相色谱-串联质谱仪(UPLC-MS/MS)同时测定当归药材中50种农药残留,对比了11种净化方式对检测结果的影响,筛选出最有效的基质净化方法。以回收率为考察指标,评估了不同基质净化方法对当归中多农残的提取净化效果,最终确定样... 采用超高效液相色谱-串联质谱仪(UPLC-MS/MS)同时测定当归药材中50种农药残留,对比了11种净化方式对检测结果的影响,筛选出最有效的基质净化方法。以回收率为考察指标,评估了不同基质净化方法对当归中多农残的提取净化效果,最终确定样品经乙腈提取,NaCl净化,在电喷雾正负离子扫描、依赖保留时间的动态多反应监测模式(dMRM)下,以基质匹配内标法定量。结果表明,50种农药在NaCl净化法下回收率最高,在各自的浓度范围内线性关系良好(R^2>0.99);3个添加水平(10、50、100μg/kg)下,大多数农药的回收率为70.1%~117.7%,相对标准偏差(RSD,n=6)不大于20.0%,50种农药的定量限为1.0~20.0μg/kg。该方法为当归中准确、高效、经济的检测目标物提供了可靠依据。 展开更多
关键词 基质净化方法 农药残留 当归
下载PDF
蜂蜜中氯霉素残留的检测及净化方法研究 被引量:20
6
作者 陈舒舒 许凯 +1 位作者 徐彦军 潘灿平 《安全与环境学报》 CAS CSCD 2006年第2期92-95,共4页
建立了反相高效液相色谱-离子阱质谱法检测蜂蜜中氯霉素残留的方法。前处理采用改良的QuEChERS方法进行快速提取和净化。采用初级次级胺进行固相分散净化,可有效吸附蜂蜜中的糖类及有机色素等杂质。提取物在流动相甲醇∶水(0.2%乙酸胺)... 建立了反相高效液相色谱-离子阱质谱法检测蜂蜜中氯霉素残留的方法。前处理采用改良的QuEChERS方法进行快速提取和净化。采用初级次级胺进行固相分散净化,可有效吸附蜂蜜中的糖类及有机色素等杂质。提取物在流动相甲醇∶水(0.2%乙酸胺)=45∶55(体积比)中,用整体色谱柱进行快速分离和质谱检测。并对MS检测中2种离子化方式(电喷雾ESI及大气压化学APCI)、各种离子化方式下正负离子模式及离子检测方法(总离子检测TIC和选择性离子监测MRM)进行了综合比较,最终确定采用电喷雾电离法(ESI)负离子模式、多反应离子监测(MRM)对氯霉素进行定性定量分析。在0.2~200μg/kg添加浓度下,添加回收率水平在78%~93%间,变异系数在3.9%以下。该方法的检出限为0.1μg/kg,在0.1~100μg/L浓度范围内,线性方程为y=58.753x+34867,相关系数R2=0.9995。 展开更多
关键词 分析化学 蜂蜜 氯霉素 逆固相分散净化 整体柱 反相高效液相色谱-电喷雾离子阱多级
下载PDF
QuEChERS-气相色谱-串联质谱法测定香肠和火腿肠制品中13种N-亚硝胺化合物 被引量:12
7
作者 杨光 李博 李岳桦 《食品安全质量检测学报》 CAS 2019年第24期8436-8443,共8页
目的建立采用快速基质分散净化QuEChERS(quick,easy,cheap,effective,rugged,safety)-气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)快速测定香肠和火腿肠制品中13种N亚硝胺类化合物的分析方法。方法样... 目的建立采用快速基质分散净化QuEChERS(quick,easy,cheap,effective,rugged,safety)-气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)快速测定香肠和火腿肠制品中13种N亚硝胺类化合物的分析方法。方法样品加入内标,经乙腈提取,QuCEhERS萃取盐包和基质分散净化包净化,采用DB-WAXETR(30 m×0.25 mm,0.25μm)色谱柱分离,在多反应监测模式(mult-reaction monitoring,MRM)下测定,内标法定量。结果13种N-亚硝胺化合物在1~100μg/L范围内线性关系良好,相关系数(r)均大于0.99,定量限为0.03~2.84μg/kg;添加水平为3~30μg/kg,平均回收率为59.1%~119.2%,相对标准偏差为0.6%~15.1%(n=6)。结论该方法简单准确、灵敏度高、重复性好,适用于批量肉制品样品中13种N-亚硝胺类化合物的快速检测。 展开更多
关键词 快速分散净化 香肠和火腿肠制品 肉制品 N-亚硝胺 气相色谱-串联谱法
下载PDF
cDNA cloning, prokaryotic expression and purification of rat α-synuclein 被引量:1
8
作者 Xin LI Yao-Hua LI Jun-Yan HAN Shun YU Biao CHEN 《Neuroscience Bulletin》 SCIE CAS CSCD 2006年第1期29-33,共5页
Objective To clone the cDNA of rat α-Syn gene, investigate its prokaryotic expression and produce purified recombinant rat α-Syn protein. Methods Rat α-Syn cDNA was amplified from the rat brain total RNA by RT-PCR ... Objective To clone the cDNA of rat α-Syn gene, investigate its prokaryotic expression and produce purified recombinant rat α-Syn protein. Methods Rat α-Syn cDNA was amplified from the rat brain total RNA by RT-PCR and was cloned into pGEX-4T-1, a prokaryotic expressing vector. The recombinant plasmid containing rat α-Syn gene was transformed into E. Coli BL21 to express a fusion protein with rat α-Syn protein tagged by glutathione-S-transferase (GST). The fusion protein was then cleaved by thrombin during passing through the GST-agarose 4B column to release the recombinant rat α-Syn protein. The recombinant rat a-Syn protein was further purified using Superdex S200 gel filtration. Results DNA sequencing confirmed that the cloned cDNA contained 420 base pairs encoding 140 amino acids, which was identical to the reported amino acid sequence of rat α-Syn. After transformation, the recombinant plasmid pGEX-ra-Syn expressed a soluble protein that was inducible by IPTG. The purified recombinant protein was shown to be single band on SDS-PAGE, with a molecular size of around 18000, which was identical to the reported molecular size of rat α-Syn. Western blot analysis demonstrated that the recombinant protein was recognized by specific antibody against α-Syn. Conclusion The rat α-Syn gene was successfully expressed in prokaryotic expression system and highly purified rat α-Syn recombinant protein was produced. 展开更多
关键词 Α-SYNUCLEIN RAT recombinant protein PURIFICATION
下载PDF
Selective Affinity Separation of Yeast Alcohol Dehydrogenase by Reverse Micelles with Unbound Triazine Dye 被引量:4
9
作者 张天喜 刘会洲 陈家镛 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2001年第3期314-318,共5页
The reversed micelles were formed with cationic cetyltrimethylammonium bromide (CTAB) as surfactant and n-hexanol as cosolvent in the CTAB (50mmol.L-1)/hexanol (15% by volume)/hexane system. Cibacron Blue 3GA (CB) as ... The reversed micelles were formed with cationic cetyltrimethylammonium bromide (CTAB) as surfactant and n-hexanol as cosolvent in the CTAB (50mmol.L-1)/hexanol (15% by volume)/hexane system. Cibacron Blue 3GA (CB) as an affinity ligand in the aqueous phase was directly introduced to the reversed micelles with electrostatic interaction between anionic CB and cationic surfactant. High molecular weight (Mr) protein, yeast alcohol dehydrogenase (YADH, Mr = 141000) from baker's yeast, has been purified using the affinity reversed micelles by the phase transfer method. Various parameters, such as CB concentration, pH and ionic strength, on YADH forward and backward transfer were studied. YADH can be transferred into and out from the reversed micelles under mild conditions (only by regulation of solution pH and salt concentration) with the successful recovery of most YADH activity. Both forward and backward extractions occurred when the aqueous phase pH>pI with electrostatic attraction between YADH and CTAB. The recovery of YADH activity and purification factor have been improved with addition of a small amount of affinity CB. The recovery of YADH activity obtained was ~99% and the purification factor was about 4.0-fold after one cycle of full forward and backward extraction. The low ionic strength in the initial aqueous phase might be responsible for the YADH transfer into the reversed micellar phase. 展开更多
关键词 reversed micelles yeast alcohol dehydrogenase protein purification affinity technology cetyltrimethy- lammonium bromide
下载PDF
Effects of Self-purification of River Water on Laundry Wastewater
10
作者 Liya TAN Yili CHEN +4 位作者 Liuying CHEN Linghan ZENG Yujie CAI Bingbing FENG Hai WANG 《Agricultural Science & Technology》 CAS 2017年第6期1023-1028,共6页
[Objective] This study was conducted to investigate the effect of laundry wastewater on the quality of river water and the dilution purification effect of river water on laundry wastewater. [Method] The effects of lau... [Objective] This study was conducted to investigate the effect of laundry wastewater on the quality of river water and the dilution purification effect of river water on laundry wastewater. [Method] The effects of laundry wastewater on the contents of total nitrogen(TN), total phosphorus(TP), suspended solids(SS), chemical oxygen demand(COD) and linear alkylbenzene sulfonic acid(LAS) were studied in 7 rivers of Shaoxing City. [Result](1) The contents of TN, TP, SS, COD and LAS increased by 92%, 99%, 340%, 351% and 923%, respectively, at the discharging moment of laundry wastewater; and(2) the five pollutional indexes significantly decreased over time, and especially 2 h after the discharge of laundry wastewater, compared with former the discharge of laundry wastewater, the contents of TN, TP, COD and LAS increased by 6%, 11%, 9% and13%, respectively,while the contents of SS still increased by 76%, i.e., SS required a longer time to achieve self-purification. [Conclusion] Laundry wastewater has some influence on thequality of river water, and the self-purification function of river water could effectively remove pollutants. 展开更多
关键词 Laundry wastewater SELF-PURIFICATION Total nitrogen Total phosphorus Linear alkylbenzene sulphonic acid
下载PDF
Dynamics of liquid-phase catalytic oxidation of hydrogen sulfide removal in rural biogas
11
作者 贾丽娟 宁平 +2 位作者 王向宇 瞿广飞 熊向锋 《Journal of Central South University》 SCIE EI CAS 2014年第7期2843-2847,共5页
Hydrogen sulfide in rural biogas was removed with liquid-phase catalytic oxidation.By using rare earth as catalyst,and sulfosalicylic acid as stabilizer,H2S purification efficiency could increase as high as 96%,and su... Hydrogen sulfide in rural biogas was removed with liquid-phase catalytic oxidation.By using rare earth as catalyst,and sulfosalicylic acid as stabilizer,H2S purification efficiency could increase as high as 96%,and sulfur capacity of the composite solution was about 3 g/L.The results show that purification efficiency was affected by catalyst addition,pH,experimental temperature,and sulfur capacity.The parameters effects on catalytic oxidation were studied,and the optimized conditions were that Fe3+ concentration 0.08 mg/L,reaction temperature 70°C,pH 9.0,with a absorption solution volume of 50 mL,a gas flow rate 200 mL/min,and H2S mass concentration of 1.58-2.02 mg/m3. 展开更多
关键词 liquid phase catalytic oxidation hydrogen sulfide rural biogas purification efficiency RARE-EARTH
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部