曙红B共振光散射法测定微量的盐酸异丙嗪

研究了染料曙红B与盐酸异丙嗪的结合反应.在pH=3.50的Walpole介质中,曙红B本身的共振光散射信号较弱,与盐酸异丙嗪结合形成离子缔合物后,体系的共振光散射明显增强,并且光散射增强强度与盐酸异丙嗪在一定浓度范围内成正比,据此建立了一种高灵敏测定盐酸异丙嗪的方法.在体系的最大散射波长363 nm处,测得盐酸异丙嗪的线性范围为7.5×10-8～4.5×10-6 g/mL,检测限为1.8×10-8 g/mL,用于盐酸异丙嗪片剂、针剂、人血清及尿样中盐酸异丙嗪的测定,结果令人满意.     

厚朴酚-结晶紫-十二烷基硫酸钠体系的共振光散射光谱研究及分析应用

在pH=3.5的柠檬酸钠-盐酸缓冲介质中,阳离子染料结晶紫(CV)对厚朴酚/和厚朴酚与十二烷基硫酸钠( SDS)的共振光散射光谱有协同增强作用.在优化的实验条件下,在共振光散射波长为333 nm处,体系的共振光散射增加值与厚朴酚及和厚朴酚在0.02～5.33 μg/mL范围内呈良好的线性关系,检出限为1.88×10-4...     

盐酸雷尼替丁的共振光散射新体系研究及其分析应用

在酸性条件下,盐酸雷尼替丁、铬黑T和钼酸铵通过静电作用形成三元离子缔合物,使体系的共振光散射明显增强.据此建立了共振光散射测定盐酸雷尼替丁的新方法.在最佳条件下,体系的最大散射峰位于363 nm处.共振光散射增强的程度与盐酸雷尼替丁的浓度呈良好的线性关系.方法的线性范围在0.015～0.165 mg/mL,检出限为9.5×10-3 mg/mL.将该方法用于市售盐酸雷尼替丁片的测定,并与药典方法进行对照,证明两种方法之间无显著性差异.     

基于与全氟辛烷磺酸作用共振光散射法测定盐酸小檗碱

在pH 1.81 Britton-Robinson缓冲介质中,盐酸小檗碱与全氟辛烷磺酸相互作用,在290 nm处产生显著增强的散射信号.其增强强度与盐酸小檗碱质量浓度在0.03～7.8μg/mL范围内呈线性关系,据此建立了盐酸小檗碱的共振光散射测定方法,检出限达4.4 ng/mL.方法用于药片含量测定,RSD<4.4%...     

共振光散射光谱法测定马来酸氯苯那敏

在pH 4.3的HAc-NaAc缓冲溶液中,荧光桃红与马来酸氯苯那敏依靠静电引力和疏水作用力形成离子缔合物,导致体系共振光散射增强.讨论了共振光散射增强的原因,并考察了一些因素对体系的影响.在最佳实验条件下,增强的共振光散射强度与马来酸氯苯那敏的浓度在0.2～12.0 μg/mL范围内呈良好线性关系,检出限为0.047...     

盐酸苯海拉明和曙红B体系的光谱研究及其分析应用

在pH 3.1的Britton-Robison缓冲介质中,曙红B与盐酸苯海拉明借助静电引力和疏水作用力形成离子缔合物,使最大散射波长为364 nm处的共振光散射光谱得到加强。研究了体系的共振光散射光谱和紫外-可见吸收光谱。建立了一种测定盐酸苯海拉明的新方法。体系共振光散射增强的强度与盐酸苯海拉明的质量浓度在0.5~11.2 mg/L范围内呈现良好的线性关系,方法的检出限为41.7μg/L。可用于药物中盐酸苯海拉明的测定。     

盐酸奎宁与全氟辛烷磺酸体系的共振光散射光谱研究及其分析应用

研究了盐酸奎宁(Quinine dihydrochloride,简称Quinine)与全氟辛烷磺酸(perfluorooctane sulfonate,简称PFOS)相互作用的共振光散射(resonance light scattering,RLS)光谱,并建立了PFOS的共振光散射分析方法.在pH值为2.87的Britton-Robinson(BR)缓冲溶液中,全氟辛烷磺酸根阴离子与质子化的盐酸奎宁通过静电引力和疏水作用形成2:1的离子缔合物,引起共振光散射强度(IRLS)显著增强,最大散射波长位于283nm处,增强的散射信号强度与PFOS浓度在0.10～50.0μmol/L范围内呈线性关系,据此建立了测定PFOS的散射分析方法,检测限为9.88nmol/L.讨论了体系的最佳反应条件及外来物质的干扰,同时研究了体系的吸收光谱及荧光光谱,并探讨了反应机理.本方法用于水样及人体血清样品中PFOS的测定,RSD≤4.2%.     

罗丹明B共振光散射法测定马丙共聚物

建立了共振光散射法测定马丙共聚物的新方法.在B-R缓冲溶液中,罗丹明B与马丙共聚物结合形成离子缔合物并产生强烈共振光散射增强效应,其最大散射峰位于372 nm.研究了pH、罗丹明B浓度、反应时间和温度对散射峰的影响,结果表明在pH1.5～2.0的B-R缓冲体系中,1.0×10-3 mol /L罗丹明B用量为1.5 mL...     

硫酸皮肤素的共振瑞利散射法测定

研究了硫酸皮肤素对十六烷基三甲基溴化铵(CTMAB)发生缔合反应的条件、共振瑞利散射特征.结果表明,在pH 5.8的BR缓冲溶液中,硫酸皮肤素能与CTMAB形成离子缔合物,使共振瑞利散射RRS急剧增强并产生新的RRS光谱.硫酸皮肤素浓度在0.04～4.0μg/mL之间与散射强度呈线性关系,方法检出限(3σ)为13 ng/mL,并以CTMAB体系为例研究了共存物质的影响,表明方法选择性好.     

蛋白质-SDS-罗丹明B体系的共振光散射光谱及其分析应用

研究了阴离子表面活性剂十二烷基硫酸钠(SDS),阳离子染料罗丹明B,与蛋白质相互作用的共振光散射(RLS)光谱及用于蛋白质的测定.实验表明,在pH 4.35的酸性介质中,SDS的共振光散射强度较小,它与蛋白质结合后,共振光散射强度能得到增强,但加入阳离子染料罗丹明B后,共振光散射强度显著增强.在λ=332.0 nm处,ΔIRLS最大,并且增强的共振光散射信号与蛋白质的浓度成正比.据此建立了一种测定蛋白质的新方法,该方法灵敏度高,对HSA的检出限达到1.9 ng/mL,线性范围为0.01～5.0 μg/mL.用于人血清样品中蛋白质的测定,回收率为94.0%～105.5%.     

花菁-脱氧核糖核酸的共振光散射光谱及其分析应用

研究了一种苯并噻唑阳离子花菁与脱氧核糖核酸(DNA)作用的共振光散射光谱,在pH 6.0的六次甲基四胺-HCl缓冲介质中,痕量DNA的加入使花菁在590nm的共振光散射强度显著增强。在最佳实验条件下,增强的共振光散射强度与DNA浓度具有良好的线性关系,据此建立了一种测定DNA的共振光散射光谱法。方法的线性范围为:小牛胸腺DNA(CT DNA),0～20μg/mL,鱼精子DNA(FS DNA),0～15μg/mL;检出限分别为0.005μg/mL和0.008μg/mL。该方法已用于合成样品中DNA的测定。     

Determination of proteins with tetracarboxy manganese(II) phthalocyanine by resonance light scattering technique

A novel method for the determination of proteins by using tetracarboxy manganese(II) phthalocyanine (MnC4Pc) as a resonance light scattering (RLS) probe has been developed. At pH 3.0 Britton-Robinson (B-R) buffer solution, the RLS intensity of MnC4Pc at 385 nm is greatly enhanced in the presence of proteins. The effects of pH, reaction time, concentration of MnC4Pc and interfering substances on the enhanced RLS intensity are investigated, respectively. Under optimal conditions, the linear ranges of the calibration curves are 0-2.00 microg mL(-1) for bovine serum albumin (BSA) and human serum albumin (HSA), 0.0-1.75 microg mL(-1) for human-IgG and ovalbumin, with a detection limit of 16.37 ng mL(-1) BSA, 17.62 ng mL(-1) HSA, 19.41 ng mL(-1) human-IgG and 20.72 ng mL(-1) ovalbumin. The method has been applied to the determination of total proteins in human serum samples collected from a hospital and the results are in good agreement with those reported by the hospital.     

Resonance light scattering spectroscopy study of interaction between norfloxacin and calf thymus DNA and its analytical application

The interaction between norfloxacin and calf thymus double-stranded DNA (dsDNA) has been studied by a resonance light scattering (RLS) technique with a common spectrofluorometer. The characteristics of RLS spectra, the effective factors and optimum conditions of the reaction have been investigated. In Britton-Robinson (BR) buffer (pH 5.87), norfloxacin has a maximum peak 405.5 nm and the RLS intensity is remarkably enhanced by trace amount of calf thymus dsDNA due to the interaction between norfloxacin and dsDNA. The binding of norfloxacin to DNA forms large particles, which were characterized by RLS spectrum, scanning electron microscopy (SEM), ultraviolet-visible (UV-vis) spectrum, and fluorescence spectrum. Based on the enhanced RLS intensity, a novel method for sensitive determination of calf thymus dsDNA concentration ranging from 0.02 to 2.3 microg ml(-1) was developed. The determination limit (3 sigma) was 1.2 ng ml(-1). The method is simple, rapid, practical and relatively free from interference generated by coexisting substance, as well as much more sensitive than most of the reported methods. Three synthetic samples of ctDNA were determined with satisfactory results.     

硫代乙酰胺共振光散射方法检测环境水样中痕量汞

在pH=3.29的酸性介质中,硫代乙酰胺(TAA)与二价汞离子发生作用产生以379.0 nm为特征峰的共振光散射(RLS)增强光谱。 在此波长下,二价汞离子的浓度与增强共振光散射强度(ΔIRLS)呈线性关系。 研究了酸度、离子强度、温度、时间以及共存物质的影响,确定了最佳测定条件,据此建立了检测痕量汞的共振光散射分析法,线性范围为0.2~10.0 μmol/L,对汞的检测限为0.02 μmol/L。 方法成功的应用于环境水样中汞离子的检测。     

基于与铁氰化钾和Zn~(2+)作用共振光散射法测定异烟肼

在酸性介质中,异烟肼能将铁氰酸根离子还原成亚铁氰酸根离子,后者与硫酸锌反应生成K2Zn3[Fe(CN)6]2粒子引起体系的共振光散射信号显著增强.在345nm处增强的散射信号强度ΔIRLS与异烟肼的浓度在0.01~1.0μg/mL范围内呈线性关系,据此建立了一种检测异烟肼含量的共振光散射(RLS)分析方法.线性回归方程为ΔIRLS=136.1+4239c(c,μg/mL),相关系数(r)为0.9984,检测限(3σ)为3.8ng/mL.该方法已成功用于异烟肼片剂及血清样品的测定.此外,文中还结合吸收光谱,动态光散射,扫描电子显微镜等表征手段对反应机理和RLS信号强度增强的原因进行了探讨.     

Study on the interaction of DNA with resveratrol by resonance light scattering technique and its analytical application

The interaction between resveratrol and DNA has been studied by resonance light scattering (RLS) technique. In strongly acidic solution, resveratrol has a maximum peak at 368 nm and the RLS intensity is remarkably enhanced by trace amounts of DNA due to its interaction with resveratrol. Based on this, a novel assay for nucleic acids has been developed. The characteristics of RLS, fluorescence and UV-VIS absorption spectra, the influential factors and optimum conditions of the reaction have been studied. The enhanced RLS intensity at 368 nm is proportional to the concentration of DNA within the range of 0–1600 μg/L for calf thymus DNA. The determination limit (3σ) is 5.2 ng/mL. The study of foreign substance effect on the determination of DNA indicates that most of metal ions have little effect on the determination of DNA. Three synthetic samples of DNA were analysed with satisfactory results. The results show that the proposed method is very sensitive, convenient, rapid and reproducible.     

全氟辛烷磺酸与蛋白质体系的共振光散射光谱及其分析应用

研究了牛血清白蛋白(BSA)与全氟辛烷磺酸(PFOS)相互作用的共振光散射(RLS)光谱,建立了PFOS的共振光散射分析方法。 在pH值为4.1的BR缓冲溶液中,全氟辛烷磺酸根阴离子与质子化的BSA通过静电引力和疏水作用形成离子缔合物,引起共振光散射强度(IRLS)显著增强,最大散射波长位于285.0 nm处,增强的散射信号强度与PFOS浓度在0.2～25.0 μmol/L范围内呈线性关系,据此建立了测定PFOS的光散射分析方法,检出限为20.0 nmol/L。 讨论了体系的最佳反应条件及外来物质的干扰,并探讨了反应机理。 建立的共振光散射法用于环境水样中PFOS的测定,RSD≤4.4%。     

Multi-spectroscopic method study the interaction of anti-inflammatory drug ketoprofen and calf thymus DNA and its analytical application

Interactions of the anti-inflammatory drug ketoprofen with calf thymus DNA (ctDNA) in aqueous solution have been studied by multi-spectroscopic method including resonance light scattering (RLS) technique, ultraviolet spectra (UV), (1)H NMR, etc. The characteristics of RLS spectra, the effective factors and optimum conditions of the reaction have been unequivocally investigated. Mechanism investigations have shown that ketoprofen can bind to ctDNA by groove binding and form large particles, which resulted in the enhancement of RLS intensity. In Critic acid-Na(2)HPO(4) buffer (pH=6.5), ketoprofen has a maximum peak 451.5 nm and the RLS intensity is remarkably enhanced by trace amount of ctDNA due to the interaction between ketoprofen and ctDNA. The enhancement of RLS signal is directly proportional to the concentration of ctDNA in the range of 1.20×10(-6)-1.0×10(-5) mol/L, and its detection limit (3σ) is 1.33×10(-9) mol/L. The method is simple, rapid, practical and relatively free from interference generated by coexisting substance, and was applied to the determination of trace amounts of nucleic acid in synthetic samples with satisfactory results.     

同多酸和染料探针共振光散射法测定蛋白质

在酸性条件下,铬黑T、钼酸铵与蛋白质形成聚合物,使体系的共振光散射明显增强。据此建立了利用共振光散射技术测定总蛋白含量的新方法。在最佳条件下,体系的最大散射峰位于555nm处。共振光散射增强的程度与蛋白质的浓度呈良好的线性关系。牛血清白蛋白和人血清白蛋白的线性范围分别为0.20～10.0μg/mL和0.10～8.0μg/mL,检出限为0.050μg/mL和0.039μg/mL。方法已用于人血清样品的分析,并与考马斯亮蓝的测定结果进行了比较,两者无显著性差异。