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1.
建立了水产品中氯霉素、甲砜霉素和氟甲砜霉素药物残留量同时测定的高效液相色谱-串联质谱方法。以氘代氯霉素做内标,选择乙酸乙酯提取,HLB固相萃取柱净化,洗脱液氮气吹干,采用LC-MS/MS选择反应监测(SRM)负离子模式进行定性、定量分析。结果表明:氯霉素的检出限(LOD)为0.01μg/kg,甲砜霉素和氟甲砜霉素检出限(LOD)为0.03μg/kg,检测结果的相对标准偏差为3.3%~9.7%(n=6),加标回收率达到78.6%~110.5%。该方法在水产品中氯霉素、甲砜霉素和氟甲砜霉素药物的残留测定中具有很好的应用前景。  相似文献   

2.
建立了饲料中氯霉素(CAP)、甲砜霉素(TAP)、氟甲砜霉素(FF)3种抗生素残留量的高效液相色谱-串联质谱(HPLC-MS/MS)测定方法。样品经碱化乙酸乙酯提取,蒸发浓缩,提取物经正己烷脱脂,液-液分配净化后,采用电喷雾电离源(ESI)负离子多反应监测(MRM)模式检测,内标法定量。氯霉素、氟甲砜霉素和甲砜霉素的线性范围分别为0.2~10.0、0.2~10.0、1.0~50.0μg/L,相关系数(r2)不低于0.990 0;其检出限分别为0.1、0.1、0.5μg/kg,定量下限分别为0.3、0.3、1.5μg/kg。3种抗生素药物的平均回收率为77%~108%,相对标准偏差(RSD)不大于10.9%。  相似文献   

3.
建立了一种同时测定水产品中甲砜霉素和氟甲砜霉素药物残留的超高效液相色谱(UPLC)方法。样品经乙酸乙酯提取,正己烷液-液分配除脂,过HLB固相萃取小柱,用3mL10%甲醇淋洗,5mL100%甲醇洗脱,洗脱液用氮气吹干,残渣用1mL10%乙腈水溶液定容。采用超高效液相色谱分离,二极管阵列检测器检测,外标法定量。甲砜霉素在0.05~2.0mg/L,氟甲砜霉素在0.025~1.0mg/L范围线性关系良好,相关系数分别为0.9996、0.9999;样品加标平均回收率分别为80.0%、95.8%;相对标准偏差分别为5.6%、11.2%,甲砜霉素、氟甲砜霉素检出限分别为10μg/kg、5μg/kg。  相似文献   

4.
何世伟  赵永纲  朱岩 《色谱》2018,36(11):1112-1118
采用TiO_2修饰磁性石墨烯作为通过型固相萃取柱填料,并用于净化去除血液样品中磷脂类物质的干扰,建立了一种快速、高效、准确的测定人血中残留氯霉素、甲砜霉素与氟甲砜霉素的超快速液相色谱-串联质谱分析方法。样品经乙腈提取,使用TiO_2修饰磁性石墨烯-通过型固相萃取柱进行净化处理,以Eclipse Plus C18色谱柱(100 mm×2. 1 mm,1. 8μm)分离,以0. 08%(v/v)氨水溶液与0. 08%(v/v)氨水乙腈溶液为流动相梯度洗脱,电喷雾离子源多反应监测负离子模式下检测,采用内标法定量。3种目标化合物在0. 1~10. 0μg/L范围内具有良好的线性(决定系数r 20. 999),定量限(S/N10)为0. 056~0. 082μg/L,目标化合物的加标回收率为90. 0%~105%,相对标准偏差为1. 2%~6. 6%。该方法可用于临床血样中残留氯霉素、甲砜霉素与氟甲砜霉素的快速筛查和确证分析。  相似文献   

5.
以D5-氯霉素为内标,建立了高效液相色谱-电喷雾串联质谱测定饲料预混料、配合饲料中氯霉素、甲砜霉素与氟甲砜霉素含量的方法.样品磨碎后,采用乙酸乙酯提取,离心后上清液于45℃下氮气吹干,溶解残渣并用正己烷液液萃取净化处理,经C18固相萃取净化后,通过Agilent Eclipse C18(150 mm ×4.6 mm,5μ nn)色谱柱以甲醇-0.1%甲酸作流动相梯度洗脱分离,采用电喷雾电离(ESI)、多反应监测(MRM)负离子扫描方式进行定性与定量分析.方法的检出限(LOD)为0.5μg/L,定量下限(LOQ)为1.0 μg/L,待测物与内标物定量离子的峰面积比值与待测物的质量浓度在0.5~10.0 μg/L范围内呈良好线性关系,相关系数(r2)不低于0.9990.在0.5~2.0 μg/kg范围内,3个水平的加标回收率为78%~107%,相对标准偏差(RSDs,n=6)均小于10%.  相似文献   

6.
采用高效液相色谱-串联质谱(HPLC-MS/MS)法同时测定了蜂王浆中氯霉素、甲砜霉素和氟甲砜霉素残留。样品加入阴性蜂蜜和水均质后,采用乙酸乙酯提取,蒸发浓缩,C18固相萃取净化。HPLC分离后,串联质谱法以电喷雾负离子多反应监测方式(MRM)进行定性定量分析。通过对固相萃取条件的优化,大大减小了基质的干扰。氯霉素、氟甲砜霉素和甲砜霉素的检出限分别为0.1 ng/g0、.2 ng/g和0.5 ng/g,平均回收率为89.9%~98.4%,相对标准偏差(RSD)均小于8.2%。  相似文献   

7.
建立了同时测定蜂胶、蜂胶原料保健食品(片剂、硬胶囊、软胶囊3种剂型)中氯霉素、甲砜霉素和氟甲砜霉素残留的高效液相色谱-串联质谱(HPLC-MS/MS)方法。样品经0.1 mol/L盐酸溶解,涡旋混匀,超声提取后,通过HLB柱串接NH_2固相萃取柱净化。采用Waters ACQUITY UPLC~?BEH C_(18)(2.1 mm×100 mm,1.7μm)色谱柱进行分离,以0.1%甲酸水-乙腈为流动相梯度洗脱,经HPLC-MS/MS测定,电喷雾离子源负离子模式检测,外标法定量。结果表明3种目标分析物在0.10~20.0μg/L范围内线性关系良好,相关系数(r~2)均大于0.999;蜂胶原胶、片剂和软胶囊剂型中3种目标物的检出限(LOD)为0.037~0.083μg/kg,定量下限(LOQ)为0.12~0.28μg/kg;硬胶囊剂型中的LOD为0.39~0.47μg/kg,LOQ为1.28~1.57μg/kg;在2.5、5.0、10.0μg/kg加标水平下,3种目标物的回收率为66.6%~120%,相对标准偏差(RSD)为0.80%~11%。将该方法应用于45个实际样品检测,其中氯霉素的检出率为22.22%,最大残留量为14.32μg/kg;氟甲砜霉素的检出率为17.78%,最大残留量为21.62μg/kg。该方法操作简单、灵敏度高、适用性强,能够满足蜂胶、蜂胶原料保健食品中此类药物残留的检测要求。  相似文献   

8.
 建立了鸡肉中3种氯霉素类抗生素残留的高效液相色谱-电喷雾电离三级四极杆质谱(HPLC-ESI-MS-MS)测定法。该方法采用多反应监测(MRM)负离子模式,可一次对鸡肉中的氯霉素、甲砜霉素和氟甲砜霉素进行定性和定量。该方法仅需1 g样品,并省去固相萃取步骤,具有操作简便、有机试剂消耗量少、测定周期短等优点。方法的检出限为0.010 μg/kg,测定低限为0.100 μg/kg,线性范围为0.050~1.00 μg/L,加标回收率为69.0%~92.8%,相对标准偏差为6.3%~12.9%。  相似文献   

9.
以氟甲砜霉素作内标,乙腈作为提取溶剂,采用高效液相色谱内标法检测鸡血浆中甲砜霉素的浓度。色谱柱为Shim-pack CLC-ODS(150 mm×6 mm,5μm),流动相为乙腈-水(体积比25∶75),流速为1.0 mL/min,检测波长为225 nm,柱温为40℃。在此色谱条件下,在0.25~32.00 mg/L浓度范围内,甲砜霉素浓度与甲砜霉素和氟甲砜霉素峰面积比呈线性关系,相关系数r为0.9999,最低检测浓度为0.1 mg/L;在高、中、低3个浓度水平下日内、日间精密度均大于6.1%(n=5),提取回收率大于98.68%,方法回收率为99.20%~100.25%。建立的方法符合生物样品的分析要求,可用于临床药代动力学研究。  相似文献   

10.
建立了气相色谱-负离子化学电离源质谱同时测定动物组织中氯霉素(CAP)、甲砜霉素(TAP)和氟甲砜霉素(FF)残留量的方法。样品用乙酸乙酯提取,正己烷分配去脂肪,再用Florisil柱进一步净化,甲苯作为反应介质,用N,O-双(三甲基硅基)三氟乙酰胺(BSTFA)-三甲基氯硅烷(TMCS)(体积比为99∶1)进行硅烷化处理,用间硝基氯霉素(m-CAP)作为内标进行测定。CAP的检测限可达到0.03 μg/kg,TAP和FF的检测限可达到0.2 μg/kg;上述3种药物的标准曲线的线性相关系数均大于0.99。CAP,FF和TAP的批内测定的精密度(以相对标准偏差表示)依次为5.5%,10.4%和8.8%;批间测定的精密度依次为7.4%,20.7%和19.1%。回收率为80.0%~111.5%,相对标准偏差为1.2%~15.4%。该方法前处理步骤简单,处理后杂质干扰少,灵敏度高,适用性强,可用于猪肉及禽类、水产品等多种动物组织中氯霉素类药物残留的检测。  相似文献   

11.
The spectral-polarization characteristics of absorption and phosphorescence of molecules of the initial form of nitro-substituted indolinospirobenzothiopyran were studied in oriented polyethylene films and in solutions with different polarity. An oscillator model of the electron transitions responsible for the formation of absorption and luminescence spectra was suggested. It was established that the principal differences in the spectral and photophysical properties of the compound studied and its oxygen-containing analog are associated with the fact that the electronegativity of the S atom is lower than that of the O atom. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1143–1146, June, 1997.  相似文献   

12.
非那雄胺能抑制5α-还原酶的活性,明显降低二氢睾酮水平,是一种治疗良性前列腺增生的有效药品。该合成工艺以甾烯酮酸为原料,将其与氯化亚砜反应,无须分离即与叔丁胺反应得17β-酰胺化合物,再氧化开环,环合,氢化,脱氢合成了非那雄胺。经元素分析、IR、1HNMR、13CNMR、MS分析表征了其结构。该法无须使用昂贵的2,2-二吡啶二硫化物和剧毒药品苯亚硒酸酐,且以乙酸铵代替氨气,降低了对设备的要求和腐蚀,更适用于工业生产。  相似文献   

13.
翟宗玺  刘树深  夏树屏 《化学学报》1990,48(10):946-950
用氧化镁氯化镁水溶液制备了8水合氯氧化镁[nMg(OH)2·MgCl2·8H2O], 并测定了其在盐酸中的溶解热, 实验结果表明, 氯氧化镁溶解热与n值呈线性关系, 根据溶解热求出5Mg(OH)2·MgCl2·8H2O和3Mg(OH)2·MgCl2·8H2O的生成热分别为-7727.1和5888.1kJ·mol^1^-。  相似文献   

14.
Two vanilloids, (5E)-8-(4-hydroxy-3-methoxyphenyl)oct-5-en-4-one (1) and 4-[3-hydroxydecyl]-2-methoxyphenol (2), isolated from the dried seeds of Grains of Paradise (Aframomum melegueta), were synthesized; the latter compound was made as the S-enantiomer and the material derived from the seeds was found to be a 1:1.7 mixture of the R and S isomers. The synthetic route used should allow the preparation of analogs having extended alkyl chains and consequently different lipophilicity, and 3, a homolog of 2, was also prepared.  相似文献   

15.

The heats of detonation of 20 simple high explosives and explosive mixtures were determined by means of an adiabatic detonation calorimeter designed by the authors. The results indicated that the performance of the instrument was reliable and the experimental data were very accurate. For explosive mixtures, there was a linear accumulative relationship between the heats of detonation of the explosive mixture and its components. Accordingly, the heats of detonation of explosive mixtures could be calculated directly from the heats of detonation of simple explosives and the characteristic heats of other components. The experiments showed that the gold or brass shell of the cylindrical charge could be substituted by a thick-walled porcelain shell, which had the advantage of cheapness.

  相似文献   

16.
Cotton cellulose was swollen in a sodium hydroxide solution and carboxymethylated by a two-bath method for different periods of time for each process. The kinetics of acid hydrolysis and the crystallinity of the swollen and carboxymethylated samples were measured. The proportion of broken bonds, rate constants for hydrolysis, and permeability of cellulose to hydrolyzing agents were calculated. The susceptibility of glycosidic linkages to acid hydrolysis was improved by carboxymethylation more than by swelling in alkali. The increased accessibility of carboxymethylcellulose to acid was regarded as a consequence of increased intra-and intercrystalline swelling and of the glycosidic bonds' weakness caused by the electron-attracting carboxymethyl group on the C-6 position.  相似文献   

17.
In this review, the research of the author in the field of colloidal systems is summarized. The factors influencing colloidal stability are systematized and analyzed. Examples are presented to illustrate the practical utilization of the theory of stability of colloids and thin films.This review was prepared on the basis of the works of the author, which were awarded the State Premium for 1991 in the field of science and technology, chemistry section.Institute of Physical Chemistry, Russian Academy of Sciences, 117915 Moscow. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 8, pp. 1708–1717, August, 1992.  相似文献   

18.
Main hydration products of two cement pastes, i.e. CSH-gel, portlandite (P) (and specific surface S) were studied by static heating, and by SEM, TEM and XRD, as a function of cement strength (C-33 and C-43) hydration time (th) and subsequent hydration in water vapour.Total change in mass on hydration and air drying, Mo, increased with strength of cement paste and with hydration time. Content of water escaping at 110 to 220°C, defined as water bound with low energy, mainly interlayer and hydrate water, was independent on cement strength but its content increased with (th). Content of chemically bound (zeolitic) water in CSH-gel, escaping at 220-400°C, was slightly dependent on strength and increased with (th). It was possibly derived from the dehydroxylation of CSH-gel and AFm phase. Portlandite water, escaping at 400-500°C, was independent on cement strength and was higher on longer hydration. Large P crystals were formed in the weaker cement paste C-33. Smaller crystals were formed in C-43 but they increased with (th). Carbonate formated on contact with air (calcite, vaterite and aragonite), decomposed in cement at 600-700oC. It was high in pastes C-33(1 month) and C-43(1 month), i.e. 5.7 and 3.3%, respectively; it was less than 1% after 6 hydration months (low sensitivity to carbonation) in agreement with the XRD study showing carbonates in the air dry paste (1month), and its absence on prolonged hydration (6 months) and on acetone treatment. Water vapour treatment of (6 months) pastes or wetting-drying increased this sensitivity.Nanosized P-crystals, detected by TEM, could contribute to the cement strength; carbonate was observed on the rims of gel clusters.This revised version was published online in November 2005 with corrections to the Cover Date.  相似文献   

19.
20.
The aim of the presented work was the investigation of thermal oxidation of ilmenite in static air atmosphere. The investigations were carried out by use of a derivatograph (MOM, Hungary). The changes of crystallographic structure of investigated samples were identified by X-ray diffractometry on Philips PW-1710 diffractometer. In temperature above 500°C appears structure of hematite Fe2O3. On the basis of the thermogravimetric measurements, the contracting area and contracting volume models were found as the best fitting experimental data. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

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