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用鸡冠花红线性扫描极谱法测定蛋白质及其应用 总被引:2,自引:0,他引:2
在pH3.0的Britton—Robinson(B-R)缓冲溶液中,鸡冠花红与蛋白质能够发生相互作用形成超分子复合物,使鸡冠花红在-0.25V(vs.SCE)处的极谱还原峰峰电流下降。在最佳条件下,峰电流的下降值同人血清白蛋白(HSA)的浓度在1.0~20.0mg/L范围内呈线性关系,其线性回归方程为△ip″(nA)=184.86 111.23c(mg/L).r=0.987。将该方法应用于实际人血清样品的测定,结果与经典的考马斯亮蓝G-250光度法一致。此方法还可应用于牛血清白蛋白、牛血红蛋白、卵清白蛋白等蛋白质的测定。 相似文献
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用线性扫描极谱法研究辛伐他汀的电化学行为。在pH 6.88的0.12mol·L-1磷酸氢二钠-磷酸二氢钾缓冲溶液中,辛伐他汀于-1.188V(vs.SCE)处产生一灵敏的吸附波,其一次微分线性扫描峰电流与辛伐他汀质量浓度在0.01~5.0mg·L-1范围内呈线性关系,检出限(3S/N)为7.0μg·L-1。对5.0mg·L-1辛伐他汀溶液进行6次平行试验,相对标准偏差(n=6)为0.53%,方法可用于测定其片剂中辛伐他汀含量。 相似文献
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线性扫描极谱法测定盐酸二甲双胍 总被引:1,自引:0,他引:1
用线性扫描极谱法研究盐酸二甲双胍的电化学行为。在pH6.85的0.1mol·L-1磷酸氢二钠-磷酸二氢钾缓冲溶液中,盐酸二甲双胍于-1.165V(vs.SCE)处产生一灵敏的吸附波,其一次微分线性扫描峰电流与盐酸二甲双胍质量浓度在0.41~41.0mg·mL-1范围内呈线性关系,检出限(3S/N)为0.28mg·mL-1。对41.0mg·mL-1盐酸二甲双胍溶液进行6次平行试验,相对标准偏差(n=6)为0.72%。此方法已用于测定其片剂中盐酸二甲双胍的含量。 相似文献
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线性扫描极谱法测定微量肉桂酸 总被引:4,自引:0,他引:4
李丽敏 《理化检验(化学分册)》2002,38(6):295-296,298
在 1mol·L-1HOAc NaOAc介质中 (pH =3.6 ) ,肉桂酸有一还原峰 ,其峰电位为 - 1.4 7V(vs.SCE)。峰电流与肉桂酸浓度在 2 .0× 10 -5~ 8.0× 10 -4 mol·L-1之间呈线性关系 (r =0 .9989) ,检出限为 1.0× 10 -5mol·L-1。该法应用于肉桂酸含量的测定 ,结果满意 ,并对肉桂酸的电化学性质进行了研究 相似文献
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线性扫描极谱法测定黄铁矿中微量金 总被引:3,自引:0,他引:3
在乙酸-乙酸钠缓冲溶液中(pH4.9),Au(Ⅲ)与溴代邻苯三酚红(BPR)产生一灵敏的络合吸附导数极谱波,其峰电位为-0.85V(uvs,SCE),Au(Ⅲ)浓度在0.05-2.0ug/ml^-1范围内与,峰电流呈良好的线性关系,利用丙二酸掩蔽过量的铁,测定黄铁矿中微量金,结果 满意。Ⅲ 相似文献
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盐酸胺碘酮的线性扫描极谱法测定及电化学行为研究 总被引:3,自引:0,他引:3
在0.2mol/LNa2HPO4-KH2PO4(pH=6.82)支持电解质中 ,盐酸胺碘酮有一灵敏的极谱还原波 ,其峰电位VP= -1.30V(vsSCE) ,一阶导数峰电流IP 与盐酸胺碘酮的浓度在1.0×10 -7~2.0×10 -6mol/L呈良好的线性关系 (r=0.9975 ,n=11) ,检出限为5.0×10-8 mol/L ;采用标准加入法测定了片剂中盐酸胺碘酮的含量 ,其回收率在95.0 %~99.5 %之间 ;用多种电化学方法研究了盐酸胺碘酮的电化学行为 ,结果表明其电极过程为一具有吸附性和动力性的不可逆极谱波。实验测得电极反应的电子转移数、转移系数和参与电极反应的H +数分别为2、0.62和2。 相似文献
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用线性扫描极谱法和循环伏安法研究了消旋山莨菪碱在0.3mol·L~(-1)磷酸氢二钠-磷酸二氢钾缓冲溶液(pH 6.70)中的电化学行为。消旋山莨菪碱于-1.095V(vs.SCE)处产生一灵敏的吸附波,消旋山莨菪碱质量浓度在0.10~10.0mg·L~(-1)范围内与其一次微分线性扫描峰电流i_p呈线性关系,检出限(3S/N)为0.06mg·L~(-1)。对5.0mg·L~(-1)消旋山莨菪碱溶液进行6次平行试验,相对标准偏差为0.34%,该方法用于片剂中消旋山莨菪碱含量的测定,测定值与标示值相符。 相似文献
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Different-shaped aluminas were readily prepared via hydrothermal reaction. It was found that the morphology and the electrochemical sensing properties of alumina were heavily dependent on the reaction time. When extending the reaction time from 6 h to 24 h, the obtained alumina samples changed from amorphous bumps to regular microfibers in diameter of 200 nm, as confirmed by scanning electron microscopy. Transmission electron microscopy observation revealed that longer reaction time was beneficial for the formation of porous and uniform fiber-like structures. Electrochemical tests proved that alumina microfibers were more active for the oxidation of amaranth and exhibited much higher enhancement effect, compared with alumina bumps. On the surface of alumina microfibers, the oxidation peak currents of amaranth increased remarkably. The influences of pH value, amount of alumina microfibers, and accumulation time on the signal enhancement of amaranth were discussed. As a result, a novel electrochemical method was developed for the detection of amaranth. The linear range was from 1 to 150 nM, and the detection limit was 0.75 nM after 1-min accumulation. The analytical application in drink samples was investigated, and the results consisted with the values that obtained by high-performance liquid chromatography. 相似文献
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In weakly acidic buffer medium, the interaction of amikacin with calf thymus DNA, yeast RNA and denatured DNA has been investigated by using resonance Rayleigh scattering (RRS) technique. The result shows that calf thymus DNA is capable of enhancing the RRS intensity of the amikacin, while yeast RNA and denatured DNA have very little enhancement effect. Based on the characteristics, a sensitive assay for detecting double-stranded DNA in the presence of denatured DNA and yeast RNA has been developed. The enhancement of the RRS signal is directly proportional to the concentration of double-stranded DNA in the range 0.02-12.0 μg ml−1 for calf thymus DNA and its detection limit (3σ) is 2.5 ng ml−1. The method shows a wide linear range and high sensitivity, and almost no interference can be observed from RNA, denatured DNA, amino acid and most of the metal ions. The trace amounts of nucleic acid in synthetic samples and practical samples are determined with satisfactory results. Therefore, the proposed method is promising for as an effect means for recognition in vivo and determination in situ of double-stranded DNA. 相似文献
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Xue Liang Wang Zhang Yu Yu Kui Jiao 《中国化学快报》2007,18(1):94-96
A new method to determine the concentration of amikacin(AMK)using methyl blue(MB)as electrochemical probe was developed in this paper.In pH 4.5 Britton-Robinson(B-R)buffer solution,the MB reacted with AMK to form ion association complexes,which led to the reductive peak current of MB at-0.275 V(versus SCE)to decrease,and the decreases were linear with the concentration of AMK in the range of 1.0-60.0 mg/L,the regression of equation isΔIp(nA)=-8.48 102.36c(mg/L), correlation coefficientγis 0.997.The conditions for determining the concentration of AMK using linear sweep voltammetry(SLV) were optimized.The method was used to determine the content of amikacin commercially available with satisfactory results. 相似文献
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茜素黄R与蛋白质相互作用的线性扫描极谱法研究及分析应用 总被引:2,自引:0,他引:2
以电化学方法研究了在pH3.2的Britton Robinson(B R)缓冲溶液中茜素黄R与蛋白质的相互作用。茜素黄R在-0.43V(vs.SCE)有一个良好的极谱还原峰,加入人血清白蛋白(HSA)后,其峰电位不变而峰电流下降,利用峰电流的下降可以测定蛋白质。优化了结合反应条件和电化学测定条件,在最佳条件下,峰电流降低值同HSA的质量浓度在4.0~40.0mg L范围内呈线性关系,其线性方程为ΔI″p(nA)=-5.48 72.28ρ(mg L),r=0.993。将该方法应用于人血清样品的测定,结果与经典的考马斯亮蓝G 250光度法一致,回收率在97%~103%之间。此方法还可应用于牛血清白蛋白、牛血红蛋白、卵清白蛋白等蛋白质的测定。 相似文献
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采用分光光度法研究了阿米卡星和茜素红在水溶液中的电荷转移反应,室温条件下二者在水溶液中可形成结合比为1∶1荷移络合物,其最大吸收波长位于520nm处,表观摩尔吸光系数为1.44×103L·mol-1.cm-1。阿米卡星在5×10-5~6×10-4mol/L范围内符合比尔定律,线性回归方程为A=0.23+1439.5c(mol/L),相关系数r=0.9992,相对标准偏差为0.31%(n=6),加标回收率为97.6%~101.6%,据此建立了阿米卡星的测定新方法,可用于药品中阿米卡星的测定。 相似文献
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M.L. Sánchez-Martínez 《Talanta》2009,78(1):305-309
A simple and rapid homogeneous enzyme immunoassay involving the use of the malic dehydrogenase enzyme and a long-wavelength fluorophor, the oxazine Cresyl Violet, is proposed for the determination of the antibiotic amikacin in water samples. An enzymatic tracer has been synthesized by covalent binding of amikacin to malic dehydrogenase via a carbodiimide derivative. Free tracer catalyses the reaction between Cresyl Violet and malic acid giving rise to a decrease in the fluorescence of the fluorophor. Kinetic curves for this reaction have been monitored at λex 585 and λem 624 nm using the stopped-flow mixing technique, being the initial rate measured in only 2-3 s. The dynamic range of the method is 1-15 ng mL−1 and the detection limit is 0.3 ng mL−1, using aqueous standard solutions or water samples. The precision, obtained at 1 and 5 ng mL−1 and expressed as relative standard deviation, was 6.0 and 9.6%, respectively. The method has been applied to the analysis of drinking, river and wastewater samples. The sample pre-treatment involved a solid-phase extraction step for the clean-up of the samples. A recovery study was carried out to validate the method, being the values obtained in the range 80-114%, with a mean value of 96.7%. 相似文献
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A procedure to evaluate the robustness of an analytical method when there are changes in some experimental variables, when using multivariate calibration, is proposed. The procedure consists of analysing the root mean square error of prediction (RMSEP) as a response to a Plackett–Burman experimental design, through which the influence of several experimental factors on the prediction capability of the multivariate partial least squares (PLS) models built is studied. Two different ways of analysing the experimental design response are considered: establishing the residual variance with replicates and using Lenth's method. The proposed methodology has been applied to estimate the robustness of the polarographic determination of benzaldehyde when PLS calibration is used. 相似文献