共查询到20条相似文献,搜索用时 125 毫秒
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在碱性溶液中,吗啡对Ag(Ⅲ)配合物-鲁米诺化学发光体系的化学发光信号有显著抑制作用,且抑制程度与吗啡浓度成正比。基于此,建立了毛细管电泳-间接化学发光检测尿液和血液中吗啡含量的方法。在优化条件下,方法检出限为0.75 mg/L,线性范围为2.0~30.0 mg/L,相关系数(r)为0.999 8;对20mg/L的吗啡进行7次平行测定,测得的相对标准偏差(RSD)为2.0%。结合固相萃取法,该方法成功用于尿液和血液中吗啡含量的测定,平均加标回收率分别为109.0%与101.3%。该方法分辨率高、灵敏、分析成本低,可用于尿液和血液中吗啡含量的测定。 相似文献
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Wang M Zhao L Liu M Lin JM 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2007,66(4-5):1222-1227
A weak chemiluminescent (CL) emission was observed in the decomposition of peroxomonosulfate (HSO5-), which would be accelerated in the presence of trace amounts of cobalt (II). The mechanism was due to the production of singlet oxygen (1O2). Interestedly, riboflavin can enhance the CL and the CL intensity was strongly dependent on riboflavin concentration. Based on this phenomenon, a flow injection analysis (FIA) CL method was established for the determination of riboflavin. Additionally, the possible CL mechanism is proposed based on the kinetic curve of the CL reaction, CL spectra, UV-vis spectra and fluorescent spectra. The CL intensity was correlated linearly with concentration of riboflavin over the range of 1.0x10(-4) to 1.0x10(-8) g mL-1; the detection limit was 9.0x10(-9) g mL-1(S/N=3); the relative standard deviation was 1.4% for 9x10(-7) g mL-1 riboflavin (n=11). Furthermore, this method was applied to the determination of riboflavin in real tablets and injections successfully. 相似文献
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基于纳米银能够增强鲁米诺-H2O2-呋喃硫胺体系化学发光的现象,建立了测定呋喃硫胺的流动注射化学发光新方法.对体系的化学发光机理进行了初步探讨,发现该体系的化学发光光谱的最大发射波长为425nm,该体系的发光体为激发态的3-氨基邻苯二甲酸根离子.该方法测定呋喃硫胺的线性范围为1.0×10-8~1.0×10-5g/mL,检出限4×10-9g/mL,对1.0×10-6g/mL呋喃硫胺连续9次测定的相对标准偏差(RSD)为1.9%.方法已用于药物呋喃硫胺片中呋喃硫胺的测定. 相似文献
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《中国化学会会志》2017,64(8):993-999
Graphene oxide (GO ), one of the water‐soluble derivatives of graphene, could initiate strong chemiluminescence (CL ) emission of luminol in the absence of any oxidant, and then the CL intensity was inhibited by puerarin (PUE ), a main component in the traditional Chinese medicine Gegen. Based on this, a novel CL method was established for the determination of PUE . This method showed a linear relationship between the CL signal and the logarithm of PUE concentration in the range 0.01–6.00 μM . The limit of detection was 2.83 nM and the relative standard deviation (RSD ) was 1.94% for 11 determinations of 0.4 μM PUE . This method was successfully used for the determination of PUE in Gegen and human urine samples. The possible CL reaction mechanism was investigated by UV –vis, fluorescence, and CL spectra, as well as by some chemical experiments. 相似文献
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Chemiluminescence (CL) has been applied to evaluate the oxidation susceptibility of various polyolefins: low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE) and isotactic polypropylene (i-PP). The intensity of CL emission in inert atmosphere could be related to the previous oxidation level. The thermal stability at 170 °C of the hydroperoxides in LDPE seems to be lower than that in LLDPE or HDPE. The kinetic parameters of the oxidation at 170 °C in oxygen, calculated from CL data, suggest the following stability order: HDPE > LLDPE > LDPEi-PP. The intensity of CL emission was related to the CH3 content as evaluated by Fourier transform infra-red spectroscopy. 相似文献
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流动注射-化学发光法测定乌拉地尔 总被引:2,自引:0,他引:2
乌拉地尔 (Urapidil)即 6 - { [3 - [4- (o-甲氧苯基 ) - 1 -哌嗪 ]-丙基 ]-氨基 } - 1 ,3 -二甲基脲嘧啶 ,又名乌Scheme 1 The chemical structure of Urapidil拉尔碱或压宁定 ,为苯哌嗪取代的脲嘧啶衍生物 ,其结构见 Scheme 1 .乌拉地尔是一种高选择性的α受体阻滞剂 ,能使 相似文献
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Shang M Li G Yang D Kang X Peng C Lin J 《Dalton transactions (Cambridge, England : 2003)》2012,41(29):8861-8868
Green emitting Li(2)ZnGeO(4):Mn(2+) phosphors were synthesized through a high temperature solid-state reaction process. X-Ray diffraction, field emission scanning electron microscopy, photoluminescence (PL) and cathodoluminescence (CL) spectra were utilized to characterize the synthesized samples. Under UV and electron-beam excitation, the pure Li(2)ZnGeO(4) sample shows a blue emission due to defects, while the Li(2)ZnGeO(4):Mn(2+) sample exhibits a green emission corresponding to the characteristic transition of Mn(2+) ((4)T(1)→(6)A(1)). In particular, the CL intensity (brightness) of Li(2)ZnGeO(4):Mn(2+) is higher than that of commercial green phosphor ZnO:Zn. In addition, the CL properties of Li(2)ZnGeO(4):Mn(2+) phosphor, the dependence of CL intensity on accelerating voltage and filament current, the decay behavior of CL intensity under electron bombardment, and the stability of CIE chromaticity coordinates, have been investigated in detail. The results indicate that the as-prepared Li(2)ZnGeO(4):Mn(2+) phosphor has a good CL intensity and CIE coordinate stability with green emission under low-voltage electron beam excitation. Therefore, Li(2)ZnGeO(4):Mn(2+) is a promising green phosphor for application in full-color field-emission displays. 相似文献
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CdTe nanocrystals-enhanced chemiluminescence from peroxynitrous acid-carbonate and its application to the direct determination of nitrite 总被引:1,自引:0,他引:1
Zhang H Zhang L Lu C Zhao L Zheng Z 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2012,85(1):217-222
It was found that CdTe semiconductor nanocrystals (NCs) can induce a great sensitized effect on chemiluminescence (CL) emission from peroxynitrous acid (ONOOH)-Na(2)CO(3) system. CL spectra, fluorescence (FL) spectra, and the quenching effect of reactive oxygen species were used to investigate the CL reaction mechanism. The CL intensity was proportional to the concentration of nitrite in the range from 0.05 to 50μM. The detection limit (S/N=3) was 0.024μM and the relative standard deviation (RSD) for five repeated measurements of 0.5μM nitrite was 4.2%. This method has been successfully applied to determine nitrite in well water samples with recoveries of 94.0-100.5%. This was the first work for direct (not inhibition effect) determination of analytes using semiconductor NCs-based CL sensor. 相似文献
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Chemiluminescence of CdTe nanocrystals induced by direct chemical oxidation and its size-dependent and surfactant-sensitized effect 总被引:1,自引:0,他引:1
CdTe nanocrystals (NCs) capped with thioglycolic acid (TGA) were synthesized via a microwave-assisted method. The chemiluminescence (CL) of CdTe NCs induced by directly chemical oxidation and its size-depended and surfactant-sensitized effect in aqueous solution were then investigated. It was found that oxidants, especially hydrogen peroxide and potassium permanganate, could directly oxidize CdTe NCs to produce strong CL emission in basic conditions. The oxidized CL of CdTe NCs displayed size-dependent effect and its intensity increased along with increasing the sizes of the NCs. Moreover, the CL intensity could, if surfactants CTAB or beta-cyclodextrin were added to the above CL system, be sensitized to some degree. The sensitized CL induced by CTAB and beta-cyclodextrin is mainly contributing to the formation of aggregate nanostructure and the micellar micronanoenvironment, respectively. The possible oxidized CL mechanisms were further examined by means of photoluminescence spectra, CL spectra, and transmission electron microscopy studies. The CL properties of CdTe NCs not only will be helpful to study physical chemistry properties of semiconductor nanocrystals but also are expected to find use in many fields such as luminescence devices, bioanalysis, and multicolor labeling probes. 相似文献