共查询到19条相似文献,搜索用时 562 毫秒
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固相复合抗体放射免疫分析法测定人体SOD的含量 总被引:3,自引:0,他引:3
本文描述了固相复合抗体放射免疫分析法测定人血清和红血球中超氧化物歧化酶的含量,该法灵敏度为0.5ng,非特异为2.0±0.6%,批内误差在3.4%~4.2%(n=9)之间,批间误差在7.0%~7.5%(n=6)之间,经测定,人血清正常值为291±79(x±s)ng/mL,红血球正常值为861±95(x±s)×10^-6Hb。该法灵敏度高、特异性好,简便,快速,适于分析大量样品。 相似文献
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利用微波消解和高效液相色谱荧光检测法测定环境水样中痕量硒 总被引:16,自引:0,他引:16
基于微波消解和正相液相色谱-荧光检测测硒法,实现了对环境水样中亚纳克级硒的测定。考察了HNO3和H2SO4-H2O2两种消化体系及其工作条件,方法检出限分别可达 7.2和 10.4 pg Se,对标准参考物质的回收率分别为99.4±2.0和97.8±2.5%,在0~1.5ngSe范围内有线性关系(R2<0.996)。对北京地区 4种不同类型水体水样含硒量进行了分析测定(2mL样品),其浓度范围为 0.20~0.90μg/L,标准加入回收率为99.1%~103.4%。 相似文献
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N-乙酸基取代四氮杂大环及其镧系配合物的热力学研究 总被引:2,自引:0,他引:2
用pH电位滴定法分别在25±0.1℃,40±0.1℃和80±0.1℃,0.5mol/LKNO3水溶液中测定了H_4L(5,7,12,14-四甲基-1,4,8,11-四氮杂环十四烷-N',n",N"',N""-四乙酸)的逐级质子化常数和焓值。又在40±0.1℃和80±0.1℃条件下测定了H4L与镧系金属离子(La~(3+),Nd~(3+),pr~(3+),Sm~(3+),Eu~(3+),Gd~(3+),Dy~(3+),Yb~(3+))配合物的稳定常数。结果表明:配合物稳定性高。 相似文献
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《Journal of separation science》2017,40(20):3946-3957
Xingnaojing Injection is a traditional Chinese medicine extensively used for stroke and cerebral ischemia. For better in‐process quality control of Xingnaojing Injection, a method for the analysis of its intermediate (i.e., the distillate of Fructus Gardeniae and Radix Curcumae ) is needed to monitor and optimize the hydrodistillation extraction process. In this work, nine major volatile components in the intermediate were identified: isophorone, 4‐methylene‐isophorone, curcumenone, curcumenol, curdione, curzerenone, furanodienone, curcumol, and germacrone. A quantitative analysis of multi‐component with a single‐marker method based on high‐performance liquid chromatography with diode array detection was developed for the simultaneous determination of the nine components. In this method, only curdione was needed as the reference substance, and the other eight components were determined using their relative correction factors to curdione. In the method validation, good linearity (r > 0.9999), sensitivity, repeatability, and accuracy (recoveries within 95.3–105.4%) were shown. The repeatability and robustness of the relative correction factors were studied with different column temperatures, flow rates, detection wavelengths, columns, and instruments. In sample analyses, consistent results between the proposed method and the external standard method were shown. The proposed method provides a comprehensive and low‐cost tool for the quality assessment of the intermediate of Xingnaojing Injection. 相似文献
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García MD Galera MM Valverde RS Galanti A Girotti S 《Journal of chromatography. A》2007,1147(1):17-23
The determination of imidacloprid and its main metabolite (6-chloronicotinic acid) in honeybees was performed by liquid chromatography with post-column photochemical derivatisation in alkaline medium and fluorescence detection. The compounds were extracted from honeybees with acetone under ultrasound conditions prior to liquid-liquid partition with dichloromethane. The separation of extract components was performed using a 50 mm x 4.6 mm i.d. short column packed with 5 microm Aquasil C(18) using an acetonitrile:water gradient program as mobile phase. Injection of samples in 0.1 mol L(-1) H(3)PO(4)/KH(2)PO(4) buffer solution (pH 3) improved the chromatographic separation between the most polar components of matrix and the 6-chloronicotinic acid. Matrix components were removed to waste using an on-line clean-up method previously to post-column reaction. Limits of quantification were 0.3 and 5.0 microg L(-1) (corresponding to 1.2 and 20.0 microg kg(-1) in the honeybee sample) for imidacloprid and 6-chloronicotinic acid, respectively. The recovery was ranged from 80.2 to 91.7% with a relative standard deviation lower than 9.0%. 相似文献
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炼厂气是炼油工艺产生的各种气体的混合物,采用四阀六柱将炼厂气分离分解为3部分,以双TCD+FID检测器3通道气相色谱法快速分析炼厂气.FID通道用于分析烃类,一个TCD通道分析永久性气体和硫化物,另一个TCD通道分析氢气,采用面积归一化法定量计算分析结果.用该法测定了3种标准气体,测定值与标准值基本一致,测定结果的相对标准偏差小于8%.该法适用于测定包括液化气、烟气、裂解气等组分相近的样品组成. 相似文献
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离子排斥色谱法测定生脉注射液中的有机酸 总被引:1,自引:0,他引:1
1引言生脉注射液是由红参、麦冬和五味子3种药材经提取后制成的灭菌水溶液,为国家中药保护品种,具有益气养阴,复脉固脱的功效。前期的分析实验表明,生脉注射液中含有有机酸类成分。根据生脉注射液的生产工艺和3种药材的的化学成分研究报道,分析生脉注射液中的有机酸主要来源于五味子。五味子含有柠檬酸、苹果酸、琥珀酸等多种有机酸成分。目前,有机酸的分析方法有气相色谱法[1]、高效液相色谱法[2]、毛细管电泳法[3]及离子色谱法[4]。这些方法专属[5] 相似文献
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紫外分光光度法测定高山红景天根及其浸膏的有效成分 总被引:3,自引:0,他引:3
使用紫外分光光度法测定了高山红景天根不同部位及其浸膏中主要有效成分的含量.红景天甙、酪醇对照品溶液和供试品溶液在276nm处具有最大吸收峰,红景天甙对照品溶液的线性回归方程为A=0.00529c+0.00189,r=0.99997(n=8),线性范围为7.97~71.71mg/L,平均回收率为98.08%,RSD为2.60%(n=5).测得高山红景天原药材内层部分、外皮层部分和总体混合物部分主要有效成分(红景天甙和酪醇)的含量(以红景天甙计)分别为2.789%,2.385%和2.617%,其浸膏中主要有效成分的质量分数分别为6.384%,13.80%和6.700%.并用HPLC法验证了该法的准确性,结果表明,该法可用于红景天属植物原药材及其浸膏中主要有效成分的定量分析. 相似文献
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采用三维荧光光谱结合基于交替三线性分解算法(ATLD)的二阶校正方法测定了2种保健品中褪黑素的含量. 当组分数取2时, 测得美益天褪黑素维生素B6胶囊(MYT)和纽斯葆牌褪黑素片(NSB)中褪黑素的含量分别为(3.074±0.019) mg/capsule和(1.649±0.059) mg/tablet, 平均加标回收率分别为(97.9±4.0)%和(103.4±2.7)%, 检出限为1.4 ng/mL. 结果表明, 该方法准确可靠. 该方法具有"二阶优势", 即使样品中存在干扰, 仍可获得较好的结果, 且灵敏度较高. 采用高效液相色谱(HPLC)法对该方法进行了验证, 用t-test对2种方法获得的结果进行比较发现, 2种方法的结果之间无显著性差异, 具有良好的一致性, 但本文方法更环保、 简单. 因此, 三维荧光光谱结合二阶校正方法可作为测定褪黑素含量的新方法, 用于对含褪黑素的保健类产品进行质量监控. 相似文献
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研究采用气质联用测定了超临界CO2萃取的艾叶挥发油的主要成分。实验以挥发油中含量较高的石竹烯氧化物(12.01%)为标准物,以二甲亚砜为内标,采用气相色谱程序升温的方法对艾叶油微胶囊进行石竹烯氧化物含量测定。二甲亚砜和石竹烯氧化物的出峰时间分别为4.75和14.68min,且与其它组分完全分离,空白微胶囊在两者对应出峰位置处无干扰;线性范围为1.2~19.2mg/L;精密度、重现性和回收率均符合分析的要求。艾叶油微胶囊的平均包封率为97.6%。结果表明:所建方法可靠、准确、稳定,可用于艾叶挥发油微胶囊包封率的测定来控制微胶囊质量。 相似文献
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同步扫描-微乳状液增稳室温磷光法同时测定痕量多环芳烃的研究 总被引:1,自引:0,他引:1
同步扫描-微乳状液增稳室温磷光法同时测定痕量多环芳烃的研究杨欣,董川,魏雁声,晋卫军,刘长松(山西大学化学系,太原,030006)关键词同步扫描-微乳状液增稳室温磷光法;化学除氧技术;多环芳烃1978年Vo-Dinh等[1]将固定波长同步扫描技术用于... 相似文献