共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
用大口径毛细管柱气相色谱法测定蜂蜜中杀虫脒残留量 总被引:2,自引:0,他引:2
蜂蜜中杀虫脒残留量用气相色谱-氮磷检测器(GC-NPD)直接测定,色谱柱为HP-5大口径毛细管柱,方法的回收率为78.3%~92.5%,变异系数为4.2%,最低检测限2×10-9。样品前处理采用了微量化学法。 相似文献
3.
建立了液相色谱-串联质谱分析洋槐蜜、荆条蜜、蜂巢蜜、杂花蜜、野蜂蜜中杀虫脒及其代谢产物残留的方法。样品经氢氧化钠水溶液稀释溶解后,采用Waters Oasis HLB固相萃取柱净化。样品提取液经Agilent XDB-C18色谱柱分离,以0.1%甲酸水溶液和乙腈为流动相进行梯度洗脱。以电喷雾正离子(ESI+)模式电离,多反应监测(MRM)模式检测,基质匹配标准溶液外标法定量。杀虫脒及其代谢产物(4-氯邻甲苯胺)在2.5~250 μg/L范围内呈线性相关,相关系数(r)均大于0.999;定量限(S/N>10)为5 μg/kg,检出限(S/N>3)为2.5 μg/kg。各种蜂蜜基质样品在5、10和20 μg/kg添加水平时,杀虫脒及其代谢产物的回收率范围分别为75.8%~113.8%和85.6%~114.3%,相对标准偏差(RSD)分别为4.8%~10.2%和4.7%~9.1%,可以满足蜂蜜中杀虫脒及其代谢产物残留量的检测需要。 相似文献
4.
5.
6.
油脂中胆固醇含量的快速测定法 总被引:2,自引:0,他引:2
植物油或含动物油脂的样品用无水乙醇处理使其油脂完全溶解,分取部分试液供高效液相色谱法测定其胆固醇含量.用SB-C18分析柱(4.6mm×150 mm)作为固定相,用甲醇与水(95+5)的混合液作流动相,其流速为1.0 mL·min-1,在208 nm波长处作紫外吸收检测.此方法的检出限(3S/N)为2.0 mg·L-1,方法的回收率在96.5%~99.0%之间. 相似文献
7.
杀虫脒溴化产物的气相色谱/质谱鉴定 总被引:1,自引:0,他引:1
食品中杀虫脒(Clordimeform)残留量早已引起世界各国的重视。Huns等将杀虫脒水解为4-氯邻甲苯胺,须用特制的提取器提取,再经重氮化制备碘衍生物,最后用气相色谱电子俘获检测器检测。庄无忌等用同样的方法提取,不用重氮化而将其制备成碘衍生物用ECD测定,但衍生化反应条件和稳定性还有待进一步研究。黄志强等采用微量样品的提取技术,直接制备成溴衍生物,用电子俘获检测器检测,无须特殊设备,不但省试剂,检测结果准确,而且分析速度快。本文采用GC-MS联用技术鉴定了文献中分析的杀虫脒溴化产物。 相似文献
8.
高效液相色谱法快速测定蜂蜜中四环素族抗生素 总被引:4,自引:0,他引:4
建立了一种快速、准确、完善的测定蜂蜜中四环素族抗生素的反相高效液相色谱方法。研究了流动相配比、pH值、流速等因素对分离效果的影响,并且选出了它们的最佳值。试验和优化了两种蜂蜜样品的前处里方法,得到了满意的效果。灵敏度为4.8×10-8mol/L,回收率为96.18%。 相似文献
9.
10.
11.
毛细管区带电泳法快速测定复方布洛芬片的有效成分 总被引:3,自引:0,他引:3
研究了用毛细管区带电泳法快速测定复方布洛芬片中布洛芬和伪麻黄碱含量的方法。在0.025mol/L的磷酸盐缓冲液(pH8.1)中,上述两组分可在3min内得以完全分离,用紫外检测器在210nm处检测,并以外标法定量。11次测定含有9.5mg/L盐酸伪麻黄碱和66.7mg/L布洛芬的试样溶液,相对标准偏差为2.9%(伪麻黄碱)和1.9%(布洛芬),回收率为103.1%(伪麻黄碱)和97.6%(布洛芬)。应用毛细管区带电泳法测定复方布洛芬片剂的含量,所得结果与HPLC法一致。 相似文献
12.
反相高效液相色谱法测定杜仲中的松脂醇二葡萄糖甙 总被引:6,自引:0,他引:6
建立一种测定杜仲中松脂醇二葡萄糖甙的反相高效液相色谱法。杜仲粉末的甲醇提取液经大孔树脂柱处理后,在YWG-C18柱上进行HPLC分析。流动相为28%(V/V)的甲醇水溶液;流速1.0mL/min;紫外检测波长232nm。方法平均回收率为99.22%(n=3),变异系数0.50%~0.74%(n=5)。进样量在0.068μg~0.68μg范围内线性关系良好,r=0.9999。所建立的方法可作为评定杜仲及杜仲制品降压效果的一种简便、快速和准确的测定方法。 相似文献
13.
免疫法制备液相色谱生物样品的研究——血中沙丁胺醇的分析 总被引:1,自引:0,他引:1
用动物免疫法制备了免疫亲和柱纯化水溶性的沙丁胺醇血浆样品。琥珀酸酐交联沙丁胺醇和牛血清白蛋白获得抗原免疫家兔抗沙丁胺醇抗体——免疫球蛋白。琼脂糖Sepharose4B与抗体交联制成免疫球蛋白亲和柱。对高效液相色谱法测定中的一般提取方法和固相小柱提取法作了比较,后者具有内源性杂质干扰少的优点,是生物样品预处理的一种有效的方法。 相似文献
14.
人血清中地尔硫高效液相色谱法测定及药代动力学参数 总被引:2,自引:0,他引:2
建立了反相高效液相色谱法监测人口服地尔硫艹卓缓释片后血药浓度。血样用正己烷-氯仿-异丙醇混合溶剂(60405)提取后,以C18化学键合硅胶为固定相,甲醇-水-三乙胺为流动相,安定为内标,在239nm波长处定量检测。血药浓度在15~300μg/L范围内线性关系良好,最低检测浓度为3μg/L。批内(n=7)及批间(n=5)测定相对标准偏差分别小于6.8%和8.4%,回收率为91%~104%。监测了8名健康人口服盐酸地尔硫艹卓缓释片后的不同时间的血药浓度变化,计算了有关的药代动力学参数。 相似文献
15.
Kanda M Kusano T Kanai S Hayashi H Matushima Y Nakajima T Takeba K Sasamoto T Nagayma T 《Journal of AOAC International》2010,93(4):1331-1339
A rapid and efficient method was developed for the simultaneous determination of seven fluoroquinolone (FQ) residues: norfloxacin, ciprofloxacin, danofloxacin, enrofloxacin, orbifloxacin, sarafloxacin, and difloxacin in honey. The samples were first screened with a microbiological method by using test plates made from metal-free purified agar seeded with Bacillus subtilis BGA. When a sample was found to contain FQ residues by using the microbiological method, it was analyzed by LC with fluorescence detection (LC/FL). FQs were extracted with Na2EDTA-McIlvaine buffer and purified by a dual SPE method in which a cation-exchange cartridge was connected to an anion-exchange cartridge. The overall recoveries of the seven FQs ranged from 70.0 to 92.1%. The intra-assay and interassay CVs were < or = 7.8 and < or = 5.1%, respectively. For the microbiological method, the LOD values ranged from 2 to 9 microg/kg. For LC/FL, the LOQ values ranged from 2 to 7 microg/kg. The developed method was used to analyze 70 honey samples. In 14 samples in which the microbiological method detected the presence of FQ residues, norfloxacin, ciprofloxacin, and enrofloxacin were identified by LC/FL. 相似文献
16.
17.
Spectrophotometric method for the determination of phosphine (PH3) residues in coriander has been developed based on the reaction of phosphine with silver nitrate in 2% aqueous isopropanol. The yellow chromophore formed has an absorption maximum at 430 nm and the linear relation between the absorbances at 430 nm and the concentration of PH3 is obeyed in the range of 0.02 to 0.17 g. The method is sensitive with a detection limit of 0.008 g and can be applied for determination of 0.02 g/g residue in coriander. Recovery of added PH3 from a closed system ranges from 96 to 101%. 相似文献
18.
Kanda M Sasamoto T Takeba K Hayashi H Kusano T Matsushima Y Nakajima T Kanai S Takano I 《Journal of AOAC International》2011,94(3):878-885
A new, rapid, and efficient method for determining the fumagillin residues in honey was developed. The samples extracted were analyzed using LC/MS/MS. Chromatographic separation of fumagillin was performed in gradient mode on a C8 column (100 x 2.0 mm, 5 microm) at 40 degrees C. The mobile phase consisted of a mixture of 2 mM ammonium formate-0.01% formic acid solution and methanol; the flow rate was set to 0.2 mL/min. Under these conditions, it was possible to measure fumagillin and its isomers as a single peak. The sample preparation procedure used is based on the QuEChERS (quick, easy, cheap, effective, rugged, and safe) method, which is fast (approximately 30 min) and uses less organic solvent. The fumagillin was extracted with acetonitrile containing 0.1% formic acid, then purified using a solid-phase extraction method with an Oasis mixed-mode weak anion-exchange cartridge. The overall recovery of fumagillin ranged from 88.1 to 99.4%; the intra- and interassay CVs were <4.5% and <4.9%, respectively. The LOQ was 0.1 microg/kg. LC/MS/MS coupled with the QuEChERS method showed strong potential as a method for determining fumagillin residues in honey. 相似文献
19.
建立了分离酪胺与酪氨酸及其它杂质的反相键合相高效液相色谱法,讨论了流动相添加剂对色谱分离的影响和离子相互作用的分离机理。在C8烷基键合相分离柱上,以含Tris-高氯酸盐(20mmol/LTris,用HClO4调节pH为7.9,并添加KClO4,使总高氯酸盐浓度为30mmol/L)的甲醇-水溶液(体积比为40∶60)作为流动相,以对甲苯磺酰胺为内标物,测定了p-酪氨酸脱羧工艺产物——酪胺的质量分数。酪胺样品质量分数测定的准确度和重现性数据为(96.40±0.633)(n=11,RSD=0.66),加样回收率为99.33~100.38。方法可用于工艺条件的选择和酪胺产品质量的检测。 相似文献
20.
建立了分离测定萘普生和溴代萘普生的反相键合相高效液相色谱法。采用ODS柱,以添加50mmol/L乳酸并用高氯酸调节pH为2.5的80%甲醇-水溶液作为流动相,以苯甲酸为内标物,测定了不对称合成工艺产物中萘普生和溴代萘普生的含量。方法的准确度分别为99.83%~102.07%(萘普生)和99.0%~100.83%(溴代萘普生),相对标准偏差分别小于2.58%(萘普生)和3.64%(溴代萘普生)。方法可用于工艺条件的选择和质量检测。 相似文献