双波长共振散射比率法测定十二烷基苯磺酸钠的研究

基于表面活性剂SDBS与罗丹明B的结合反应发展了一种测定SDBS的双波长共振散射比率法.在BR缓冲溶液介质中,SDBS能与RB发生反应,其位于373.0nm的特征共振光散射信号大大增强.通过分别测定I373.0和Ⅰ685.0/I650.0来检测SDBS,当罗丹明B的浓度为1.0×10-4 mol/L时,以Ⅰ373.0为...     

溴化十六烷基吡啶的双波长共振光散射比率法测定

应用双波长共振光散射（DW—RLS）比率法研究了溴百里酚蓝（BTB）与阳离子表面活性剂溴化十六烷基吡啶（CPB）的相互作用。在pH1．5的乙酸钠-HCl缓冲溶液中,CPB本身的共振光散射很弱,BTB有一定的共振光强度,加入CPB后BTB的共振光信号显著增强,最大散射峰位于523nm,且散射光强度与CPB的浓度呈线性关系,可以通过单波长共振光散射法检测CPB,CPB质量浓度的线性范围和检出限分别为0．05—0．60mg／L和42μg／L。使用248nm和424nm两波长处散射强度比值（I248／I424）代替单波长处的共振光散射强度测定CPB,其线性范围和检出限分别为0．03～1．0mg／L和3μg／L。与共振光散射法相比较,DW—RLS比率法受酸度、离子强度等环境条件影响较小,并且有更宽的线性范围和更低的检出限,应用于合成和实际水样中CPB的测定,获得较好的结果。     

苋菜红—蛋白质体系的共振光散射光谱研究及其分析应用

研究了染色剂苋菜红与蛋白质的结合反应,在ＰＨ３．８７的Ｃｌａｒｋ－Ｌｕｂｓ缓冲介质中,苋菜红与蛋白质通过分子间作用力形成复合物。使最大波长约为３６４ｎｍ的共振光散射光谱得到加强。以苋菜红为标记物根据其共振光散射的增强程度。可用于蛋白质的定量测定,其线性响应范围为０－５．０ｍｇ／Ｌ。方法的稳定性及选择性良好,用于人血清试样中总蛋白的测定,结果与经典的考马斯亮兰法一致。     

甲基紫6B共振光散射法测定脱氧核糖核酸

基于甲基紫6B与脱氧核糖核酸在酸性条件下共振光散射的增强效应,建立了测定DNA的共振光散射法。在pH值为2．0～3．0的三羟甲基氨基甲烷一盐酸缓冲溶液中,甲基紫6B与fsDNA、ctDNA分子作用后共振光散射增强,其强度增加值与DNA的浓度呈线性关系,线性范围分别为0～1．0、0～1．5mg／L,相关系数分别为0．9993、0．9997,检出限分别为15．3、12．2ug／L,用于DNA合成样品的测定,测定结果的精密度、准确度较高。     

甲基紫6B与核酸作用的共振光散射光谱及其分析应用

将三苯甲烷类碱性染料甲基紫6B用于核酸的共振光散射测定。在pH10.8的缓冲液中 ,核酸的加入导致甲基紫6B在386nm处共振光散射的增强 ,其强度与核酸的质量浓度呈线性关系 ,据此建立了一种测定核酸的共振光散射法。fsDNA与 yRNA的线性范围分别为0.083～1.0mg·L -1和0.076～0.8mg·L -1,检出限分别为82.6和75.3μg·L -1。将该法用于混合样品中核酸的测定 ,结果令人满意。     

甲基紫共振光散射光谱法测定日落黄

建立了甲基紫共振光散射光谱法测定饮料中日落黄的方法。在pH 3的B-R缓冲溶液中,日落黄与甲基紫之间相互作用形成离子缔合物,引起共振光散射强度的显著增加。共振光散射峰分别位于339 nm和650 nm处,在650 nm处,共振光散射强度与日落黄质量浓度在0.02～0.2 mg/L范围内呈现良好的线性关系(r2=0.9981)。考察了酸度、甲基紫用量、离子强度、温度等对体系光散射强度的影响,测定了缔合物的组成比。方法的检出限为7.5μg/L,相对标准偏差(RSD)为2.1%。方法用于饮料样品中日落黄的测定,结果与紫外分光光度法一致。     

结晶紫共振光散射法测定脱氧核糖核酸

研究了三苯甲烷类碱性染料结晶此与DNA作用的共振光散射光谱,在pH9.2-10.5的范围内,加入DNA导致结晶紫共振光散射增强,在512nm处,存在一共振光散射增强峰,其强度与DNA的浓度呈线性关系,据此建立了一种测定DNA的菜振光散射法,方法的线性范围为0－900ng/mL,检出限为5.02mg/mL.已用于混合样品中的DNA的测定.     

双嘧达莫的共振光散射分析法

以共振光散射法分别研究了双嘧达莫与甲基紫、藻红B和曙红Y相互作用体系中的共振光散射性质,发现甲基紫、藻红B和曙红Y对双嘧达莫均有不同程度的共振散射光增强作用,提出了在甲基紫、藻红B和曙红Y水溶液中测定双嘧达莫的共振光散射分析法;该法灵敏度高,检出限低(16.1 nmol/L),在0.19～5μmol/L范围内共振光散射强度与双嘧达莫的浓度呈良好线性关系.     

双波长叠加共振光散射光谱技术测定酒石酸泰乐菌素含量

探讨了酒石酸泰乐菌素与阳离子染料结晶紫在pH 2.4的Clark-Lubs缓冲溶液条件下相互作用的共振光散射图谱,建立了双波长叠加共振光散射技术(DWRLS)测定酒石酸泰乐菌素含量的新方法。实验研究发现,该体系在325 nm和491 nm处产生了两个强烈的特征散射峰。在波长325 nm处,酒石酸泰乐菌素在0.04～0.24 mg·L^-1内的质量浓度与共振光散射强度差值(ΔI_RLS)呈线性关系,其线性回归方程为ΔI_RLS=19606C-787.4,相关系数R=0.9994,检出限为0.0059mg·L^-1;在波长491 nm处,酒石酸泰乐菌素在0.04～0.24 mg·L^-1内的质量浓度与共振光散射强度差值(ΔI_RLS)呈线性关系,其线性回归方程为ΔI_RLS=13006C-449.07,相关系数R=0.9996,检出限为0.0055mg·L^-1。当采用双波长叠加共振光散射技术(DWRLS)测定时,酒石酸泰乐菌素在0...     

CTMAB与DNA相互作用的共振光散射研究及其应用

应用共振光散射(resonance light scattering,RLS)光谱法对十六烷基三甲基溴化胺(CTMAB)与小牛胸腺DNA(ct DNA)相互作用进行了研究,并研究了该体系的最佳反应条件.发现CTMAB可提高ct DNA的RLS信号.采用该方法对合成样品进行了分析测定,回收率和RSD分别为94.8%~97.3%和1.1%~2.5%,检出限为9.3μg/L.     

A dual-wavelength resonance light scattering ratiometry of biopolymer by its electrostatic interaction with surfactant

A dual-wavelength resonance lighting scattering (DW-RLS) ratiometry is developed to detect anion biopolymer based on their bindings with cation surfactant. Using the interaction of Hyamine 1622 (HM) with fish sperm DNA (fsDNA) as an example, a dual-wavelength resonance light scattering (DW-RLS) ratiometric method of DNA was constructed. In Britton-Robinson buffer controlled medium, fish sperm DNA (fsDNA) could interact with Hyamine 1622 (HM), displaying significantly enhanced RLS signals. By measuring the RLS signals characterized at 300.0 nm (I_300.0) and the RLS intensity ratio (I_276.0/I_294.0), respectively, fsDNA over a wide dynamic range of content could be detected. Typically, when HM concentration is kept at 6.0 × 10⁻⁵ mol l⁻¹, using I_300.0 could detect fsDNA over the range of 50-2000 ng ml⁻¹ with the limit of 3.0 ng ml⁻¹, while using I_276.0/I_294.0 could detect fsDNA over the range of 0.5-2500 ng ml⁻¹ with the limit of 0.05 ng ml⁻¹. Thus the latter so-called DW-RLS ratiometry is obviously superior to the former one. Based on the measurements of I_300.0 and I_276.0/I_294.0 data, a Scatchard plot concerning the interaction between HM and fsDNA could be constructed and thus the binding number (n) and binding constant (K) could be available with the values of 13.5 and 1.35 × 10⁵ mol⁻¹ l, and 11.9 and 1.65 × 10⁵ mol⁻¹ l, respectively.     

A resonance light scattering ratiometry applied for binding study of organic small molecules with biopolymer

Resonance light scattering (RLS) technique is a creative application of light scattering signals detected by using a common spectrofluorometer, but it has drawbacks such as the fluctuation of signals caused by poorly quantified or variable factors. Herein we develop a RLS ratiometry to overcome the drawbacks of the technique and apply to measure the binding nature of organic small molecules (OSM) with biopolymer using the binding of cation porphyrins with heparin (HP) as an example. In near neutral solution, cationic porphyrins meso-tetrakis [(trimethylammoniumyl) phenyl] porphyrin (TAPP) and meso-tetra (4-methylpyridy) porphyrin (TMPyP-4) interact with heparin, resulting in hypochromatic effect, and enhanced RLS signals. Linear relationship could be established between the ratio of enhanced RLS signals at two wavelengths, where the maximum and minimum are available in the ratio curve of UV-vis spectrum of porphyrin to that of heparin-porphyrin complex, and the logarithm of heparin concentration, and thus a wide dynamic range detection method of biopolymers could be developed. In comparison with RLS method, this RLS ratiometric one is less affected by environmental conditions such as pH, ionic strength. The mechanism of these interactions was investigated based on the charge density distribution of the two porphyrin molecules and it could be concluded that the enhanced RLS intensity is proportionally promoted by the charge capacity of components in the complex. Additionally, the binding number and binding constant were measured scientifically by Scatchard plot.     

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.     

共振光散射光谱研究噻嗪红R与牛血清白蛋白的作用及其分析应用

研究了噻嗪红R(Thiazine red R,TR)与牛血清蛋白(BSA)作用的共振光散射(RLS)光谱特征。考察了各种影响因素,并计算出了BSA与TR的结合比(质量之比)为1.25。结果表明,在优化条件下体系的RLS强度与蛋白质浓度在一定范围内具有良好的线性关系,据此建立了一种蛋白质测定的新方法。在最佳实验条件(TR,2.0×10-5mol/L;pH2.36)下,BSA的线性范围是0.01~5.0μg/mL,检出限为1.4ng/mL。该方法已用于合成样品及尿液的测定。     

Determination of deoxyribonucleic acids by a resonance light scattering technique and its application

For the first time, acetamiprid has been used to determine nucleic acid (DNA) using the resonance light scattering (RLS). The RLS of acetamiprid was greatly enhanced by DNA in the range of pH 1.6-1.8. A RLS peak at 313 nm was found, and the enhanced intensity of RLS at this wavelength was proportional to the concentration of DNA. The linear range of the calibration curve was 0-11.0 microg ml(-1) with the detection limit of 20 ng ml(-1). The nucleic acids in synthetic sample and in rice seedling extraction were determined satisfactorily. The interaction mechanism of acetamiprid and DNA is discussed. Mechanism studies show that the enhanced RLS is due to the aggregation of acetamiprid in the presence of DNA.     

Resonance Rayleigh scattering, frequency doubling scattering and second-order scattering spectra of the heparin-crystal violet system and their analytical application

In pH 6.0-11.2 Britton-Robinson buffer solution, binding of heparin with crystal violet (CV) can result in a significant enhancement of resonance Rayleigh scattering (RRS) and resonance non-linear scattering, such as frequency doubling scattering (FDS) and second-order scattering (SOS). Their maximum scattering wavelengths, λ_ex/λ_em, appear at 492 nm/492 nm for RRS, 984 nm/492 nm for FDS and 492 nm/984 nm for SOS, respectively. The optimum conditions of the reaction, the influencing factors and the relationship between the three scattering intensities and the concentration of heparin have been investigated. New methods for the determination of trace amounts of heparin based on the RRS, FDS and SOS methods have been developed. The methods exhibit high sensitivities, the detection limit for heparin is 2.9 ng ml⁻¹ for the RRS method, 3.5 ng ml⁻¹ for the FDS method and 3.3 ng ml⁻¹ for the SOS method. The methods have good selectivity and were applied to the determination of heparin in heparin sodium injection samples with satisfactory results.     

Study on the interaction of nucleic acids with silver nanoparticles—Al(III) by resonance light scattering technique and its analytical application

It is found that Al(III) can further enhance the intensity of resonance light scattering (RLS) of the silver nanoparticles (AgNPs) and nucleic acids system. Based on this, a novel method of determination of nucleic acids is proposed in this paper. Under optimum conditions, there are linear relationships between the enhancing extent of RLS and the concentration of nucleic acids in the range of 1.0 × 10⁻⁹-1.0 × 10⁻⁷ g mL⁻¹, 1.0 × 10⁻⁷-2.0 × 10⁻⁶ g mL⁻¹ for fish sperm DNA (fsDNA), 1.0 × 10⁻⁹-7.0 × 10⁻⁸ g mL⁻¹ for calf thymus DNA (ctDNA) and 1.0 × 10⁻⁹-1.0 × 10⁻⁷ g mL⁻¹ for yeast RNA (yRNA). The detection limits (S/N = 3) of fsDNA, ctDNA and yRNA are 4.1 × 10⁻¹⁰ g mL⁻¹, 4.0 × 10⁻¹⁰ g mL⁻¹ and 4.5 × 10⁻¹⁰ g mL⁻¹, respectively. The studies indicate that the RLS enhancement effect should be ascribed to the formation of AgNPs-Al(III)-DNA aggregations through electrostatic attraction and adsorption bridging action of Al(III). And the sensitivity and stability of the AgNPs-fsDNA system could be enhanced by Al(III).     

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%.     

四羧基铝酞菁与硫酸庆大霉素相互作用的共振散射光谱及其分析应用

在弱酸性介质中, 四羧基铝酞菁和硫酸庆大霉素本身的共振散射(RLS)均较弱, 但两者相互作用形成离子缔合物时, RLS显著增强, 在350～500 nm之间有一个强散射带, 最大散射峰位于401 nm. 而且散射强度与硫酸庆大霉素的浓度成正比, 可用于硫酸庆大霉素的定量测定, 线性范围为0.025～1.5 μg/mL, 检出限0.018 μg/mL. 方法可用于市售硫酸庆大霉素注射液含量的测定.     

木质素桃红与蛋白质作用的共振光散射研究

研究了木质素桃红与蛋白质结合的共振光散射光谱. 实验结果表明, 在pH 2.56的酸性介质中, 木质素桃红与蛋白质发生静电作用产生以282.0、 346.0、 420.0 nm以及570.0 nm为特征峰的共振光散射（RLS）增强光谱. 在570.0 nm波长光激发下, 蛋白质的质量浓度与增强共振光散射强度ΔIRLS呈线性关系, 对BSA和HSA的检出限分别为39.0和22.3 ng/mL. 方法已用于尿样中总蛋白质分析.