利用氢化物发生-冷阱捕集-原子吸收光谱联用技术测定雄黄染毒大鼠血中砷的含量

采用氢化物发生-冷阱捕集-原子吸收光谱法(HG-CT-AAS)测定了雄黄染毒大鼠血中不同形态砷的含量.结果表明,雄黄在大鼠体内的代谢产物为无机砷、一甲基胂酸和二甲基胂酸,其中二甲基胂酸是主要代谢产物;3种形态砷的精密度、准确度、回收率及线性关系良好.     

雄黄对大鼠脑组织中单胺类神经递质及其代谢产物的影响

将32只Wistar大鼠随机分为对照组(口服0.5%羧甲基纤维素钠溶液)以及低剂量(0.3g/kg)、中剂量(0.9g/kg)和高剂量(2.7g/kg)雄黄混悬液处理组,通过4周连续灌胃给服雄黄混悬液;采用高效液相色谱-电化学法测定了大鼠脑组织中单胺类神经递质及其代谢产物的含量,研究了雄黄对大鼠脑组织单胺类神经递质及其代谢产物的影响.结果表明,与对照组比较,雄黄染毒组大鼠脑组织中NE、DOPAC和DA含量均呈增加趋势,而5-HIAA呈降低趋势.雄黄可对大鼠脑组织单胺类神经递质及其代谢产物产生影响,单胺类神经能系统可能是雄黄毒性作用的靶点之一.     

雄黄对大鼠脑组织能量代谢的影响

将32只Wistar大鼠随机分为对照组(口服0.5%羧甲基纤维素钠溶液)以及低剂量(0.3g/kg)、中剂量(0.9g/kg)和高剂量(2.7g/kg)雄黄混悬液处理组,通过6周连续灌胃给服雄黄混悬液,采用高效液相色谱法测定大鼠脑组织中三磷酸腺甙(ATP)的含量,研究了雄黄对大鼠脑组织能量代谢的影响.结果表明,与对照组比较,雄黄染毒组大鼠脑组织中ATP含量均呈下降趋势(P<0.05),不同剂量组间未表现明显差异(P>0.05).这表明雄黄对大鼠脑组织能量代谢具有一定的抑制作用.     

纳米雄黄与脂质体仿生膜的相互作用研究

本工作以卵磷脂与胆固醇组成的磷脂小单层脂质体（small unilamelarvesicles,suv）作为仿生膜的简单模型,采用表面等离子共振技术（SPR）、荧光偏振、拉曼（Raman）光谱、核磁共振（NMR）及原子力显微镜（AFM）研究纳米雄黄与SUV仿生膜的相互作用,证实了磷脂是纳米雄黄作用的关键靶分子．随纳米雄黄结合,SUV仿生膜的相对粘度聃值增大,膜的流动性减小．Raman光谱数据计算表明,作用后膜的纵向有序性参数s。。及横向有序性参数Slat值增大,说明纳米雄黄的结合使磷脂膜的脂酰基链全反式构型比例上升,膜的流动性减小．由Raman光谱和引PNMR结果推测,磷脂极性头部是纳米雄黄与磷脂的主要结合位点。AFM实时观测,纳米雄黄通过在膜表面打“孔”或“洞”的方式,损坏磷脂膜．     

HPLC-HG-AFS法测定雄黄中As(Ⅲ)的含量

采用离子交换高效液相色谱-氢化物发生-原子荧光光度法（HPLC—HG—AFS）测定雄黄在水、人工胃液、人工肠液中可溶性As（Ⅲ）的含量．结果发现雄黄在人工胃液及人工肠液中As（Ⅱ）的溶出量均高于在水中As（Ⅲ）的溶出量,从而增加了雄黄对机体的毒性．还研究了色谱分离条件如HCl和KBH4的浓度和流速等,并对检测器参数等实验条件进行了优化,使不同价态无机砷在10min内达到良好的基线分离．     

Studies on the biomimetic membrane interaction between liposome and realgar nanoparticles

The liposome of small unilamellar vesicles (SUV) made from phosphatidylcholine-cholesterol mixtures was used as a simple model for biomimetic membranes. The studies on the interaction between the liposome and realgar nanoparticles (NPs) demonstrate that the phospholipid is one of the key targeted molecules of realgar NPs, used by surface plasmon resonance (SPR) technology, fluorescence polarization, Raman spectroscopy, nuclear magnetic resonance (NMR) and atom force microscope (AFM). It was observed that th...     

Spectroscopic Application of Realgar Using X-ray Fluorescence and Raman Spectroscopy

ABSTRACT

Samples of realgar ore were collected from the hydrothermal products of the Eocene volcanic material of the Erzurum region in Turkey. The prepared samples were analyzed by polarized energy dispersive X-ray fluorescence (PEDXRF) and by confocal Raman spectroscopy (CRS). The goal of this study was to figure out the chemical composition of realgar and its properties through PEDXRF and CRS and the optical characteristic features under the polarized microscope. The result of the XRF analysis shows the collected realgar samples are mainly composed of As, S, Si, and Mg in different proportions. The contents of As in realgar change from 36.55% through 31.49% to 5.97% in the analyzed samples. The strong peak of the realgar samples is at 352 cm^?1, and a weaker peak exists around 190 cm^?1. The accuracy and precision of the technique for chemical analysis is demonstrated by analyzing CRM 2126-81. The realgar ores were studied by use of CRS and polarized microscopy.     

HG-FAAS法测定雄黄染毒小鼠肝及肾脏中的砷含量

建立了氢化物发生-火焰原子吸收法(HG-FAAS)测定雄黄染毒小鼠肝及肾脏中砷含量的方法 .结果表明,该方法准确、灵敏、可靠、检出限低.雄黄染毒小鼠肝、肾脏中砷的分布水平相当.同时对氢化物发生条件进行了优化.     

Preparation of Realgar Nanoparticle Suspension and Its Inhibition Effect on the Proliferation of Human Myelocytic Leukaemia HL-60 Cells

Realgar (As₄S₄) has recently been proved effective in the treatment of leukaemia in clinical trials. However, the poor solubility of realgar makes it difficult to conduct mechanistic study in cellular level. In this work, we prepared realgar nanoparticle (RNP) suspension and examined its effect on the proliferation of human myelocytic leukaemia HL-60 cells. The average diameter of the particles was 143 nm and was stable against coalescence over a 15-month storage. The suspension inhibited cell proliferation dose-dependently at concentrations from 10 to 60 µM (As), a fact shedding light on the mechanism of realgar's clinical effectiveness against hematopoietic malignancies.