Concentrations and solubility of selected trace metals in leaf and bagged black teas commercialized in Poland

The objective of this study was to determine the concentrations of heavy metals in bagged and leaf black teas of the same brand and evaluate the percentage transfer of metals to tea infusion to assess the consumer exposure. Ten leaf black teas and 10 bagged black teas of the same brand available in Poland were analyzed for Zn, Mn, Cd, Pb, Ni, Co, Cr, Al, and Fe concentrations both in dry material and their infusion. The bagged teas contained higher amounts of Pb, Mn, Fe, Ni, Al, and Cr compared with leaf teas of the same brand, whereas the infusions of bagged tea contained higher levels of Mn, Ni, Al, and Cr compared with leaf tea infusions. Generally, the most abundant trace metals in both types of tea were Al and Mn. There was a wide variation in percentage transfer of elements from the dry tea materials to the infusions. The solubility of Ni and Mn was the highest, whereas Fe was insoluble and only a small portion of this metal content may leach into infusion. With respect to the acceptable daily intake of metals, the infusions of both bagged and leaf teas analyzed were found to be safe for human consumption.     

电感耦合等离子体质谱法测定不同批次良附丸中17种无机元素的含量

目的：测定不同批次良附丸中17种无机元素的含量。方法：采用微波消解法对样品进行处理,电感耦合等离子体质谱法（ICP-MS）测定中药成方制剂良附丸中无机元素含量。结果：不同批次良附丸中Na、Mg、K、Ca、Mn、Cr、Fe、Ni、Cu、Zn、As、Se、Sr、Mo、Cd、Pb、Hg平均含量（mg·kg^-1）分别为741.57,1214.16,12157.06,99.83,185.46,2.85,678.00,3.00,4.49,27.93,0.47,0.09,6.56,0.10,0.11,1.32,0.02。结论：良附丸中富含Fe、Mn、Zn、Cu等人体必需的微量元素,含有少量Ni、Se等人体必需的微量元素,Pb、Cd、Hg、As等有害元素的含量在限度范围内,不同批次的无机元素含量差异较小,为进一步研究无机元素与其药效间的内在关联奠定了基础。     

ICP-MS法测定双黄连注射液中微量元素的含量

目的:建立双黄连注射液微量元素的测定方法,并对其所含微量元素进行含量测定。方法:样品经微波消解后,利用电感耦合等离子体质谱(ICP-MS)测定双黄连注射液中Be、B、Al、V、Cr、Mn、Fe、Co、Ni、Cu、Zn、As、Cd、Ba、Hg、Ti、Pb等17种微量元素的含量。结果:有毒金属元素Cu、Cd、Hg、Pb、As含量均符合美国药品和功能性食品的标准,微量元素中B、Al、Fe等元素含量相对较高。结论:所建立的测定方法快捷、准确、灵敏度高,可以用于双黄连注射液的微量元素的含量测定,并为其质量控制研究提供了一定的参考依据。     

Maternal transfer of trace elements in the Atlantic horseshoe crab (<Emphasis Type="Italic">Limulus polyphemus</Emphasis>)

The maternal transfer of trace elements is a process by which offspring may accumulate trace elements from their maternal parent. Although maternal transfer has been assessed in many vertebrates, there is little understanding of this process in invertebrate species. This study investigated the maternal transfer of 13 trace elements (Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, and Zn) in Atlantic horseshoe crab (Limulus polyphemus) eggs and compared concentrations to those in adult leg and gill tissue. For the majority of individuals, all trace elements were transferred, with the exception of Cr, from the female to the eggs. The greatest concentrations on average transferred to egg tissue were Zn (140?µg/g), Cu (47.8?µg/g), and Fe (38.6?µg/g) for essential elements and As (10.9?µg/g) and Ag (1.23?µg/g) for nonessential elements. For elements that were maternally transferred, correlation analyses were run to assess if the concentration in the eggs were similar to that of adult tissue that is completely internalized (leg) or a boundary to the external environment (gill). Positive correlations between egg and leg tissue were found for As, Hg, Se, Mn, Pb, and Ni. Mercury, Mn, Ni, and Se were the only elements correlated between egg and gill tissue. Although, many trace elements were in low concentration in the eggs, we speculate that the higher transfer of essential elements is related to their potential benefit during early development versus nonessential trace elements, which are known to be toxic. We conclude that maternal transfer as a source of trace elements to horseshoe crabs should not be overlooked and warrants further investigation.     

不同生长环境灰毡毛忍冬中微量元素的含量比较

目的:比较4个不同生长环境的灰毡毛忍冬中9种微量元素的含量,为GAP基地建设及饮片质量控制提供依据。方法:采用湿法消解法处理灰毡毛忍冬样品,利用火焰原子吸收光谱法测定样品中Cu、Zn、Fe、Mn、Pb、Cr、Ni、Cd的含量,用原子发射光谱法测定Se的含量。结果:Cu、Zn、Fe、Mn、Pb、Cr、Ni、Cd的回收率在96%～105%之间(n=9),Se的回收率在97%～102%之间(n=9),9种微量元素的RSD分别是1.19%、1.89%、3.49%、6.12%、6.08%、6.58%、3.53%、2.48%、3.41%(n=6)。A、B、C、D4个产地的灰毡毛忍冬中有益元素Fe含量较高,而重金属元素Pb、Cr、Ni、Cd的含量较低;B地区灰毡毛忍冬中有益元素Zn、Mn的含量较其他3个地区高。结论:本方法简便、准确,适合分析测定灰毡毛忍冬的微量元素;B地区所产灰毡毛忍冬药材质量更优。     

Evidence of species-specific detoxification processes for trace elements in shorebirds

This study investigated sub-lethal effects and detoxification processes activated in free-ranging Red Knots (RKs) (Calidris canutus) from the Pertuis Charentais on the Atlantic coast of France, and compared the results with previous data obtained on another shorebird species, the Black-tailed Godwit (Limosa limosa). The concentrations of 13 trace elements (Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Zn) were assessed in the liver, kidneys, muscle and feathers. Stable isotope analyses of carbon and nitrogen were carried out to determine whether differences in diet explained variations in elemental uptake. The mRNA expression of relevant genes (cytochrome c oxidase 1, acetyl-CoA carboxylase, Cu/Zn and Mn superoxide dismutase, catalase, metallothionein, malic enzyme), antioxidant enzyme activities (catalase, glutathione peroxidase (GPx), superoxide dismutase), and metallothionein (MT) levels were investigated to shed light on trace element detoxification and toxic effects. Although Red Knots were characterized by elevated As and Se concentrations which were potentially toxic, most elements were usually below toxicity threshold levels. The results strongly suggested a dietary specialization of Red Knots, with individuals feeding on higher trophic status prey experiencing higher As, Hg and Se burdens. Red Knots and Godwits also showed discrepancies in elemental accumulation and detoxification processes. Higher As and Se concentrations in Red Knots enhanced catalase gene expression and enzyme activity, while Godwits had higher Ag, Cu, Fe and Zn levels and showed higher MT production and GPx activity. The results strongly suggest that detoxification pathways are essentially trace element- and species-specific.     

Heavy metals in raw,fried and grilled Mediterranean finfish and shellfish

The effect of domestic pan-frying and grilling on Cd, Cr, Cu, Fe, Hg, Ni, Pb and Zn content of popular small Mediterranean finfish and shellfish was studied. The species selected -namely anchovy, bogue, hake, picarel, sardine, sand smelt, stripped mullet, Mediterranean mussel, shrimp and squid- are among the most commonly marketed and consumed in Greece and most of the Mediterranean countries. Both culinary practices examined resulted in increased metals concentrations compared to those of raw samples, the increment being inversely related to fish size and -in most cases- being more extended in pan-frying. The consumption of cooked seafood is expected to provide significant amounts of Fe and Zn followed, in decreasing order, by Cr, Cu and Ni. In addition, the estimation of (a) weekly intakes and (b) target hazard quotients for the toxic elements Cd, Hg and Pb revealed that the cooked fish and shellfish do not pose any health risk for the consumers.     

微波消解ICP-AES检测6种清热解毒类中草药中14种常微量元素

目的:建立同时检测清热解毒类中草药样品中Cu、Fe、Zn、Mn、Na、K、Ca、Mg、Cr、Ni、Pb、Se、As、Cd等14种元素的含量的分析方法。方法:用微波消解法对清热解毒类中草药样品进行消化,以电感耦合等离子体发射光谱仪(ICP-AES)检测样品中14种元素的含量,并优化微波处理条件。结果:清热解毒类中草药中含有丰富的对人体有益的常微量元素。结论:采用微波消解技术和ICP-AES相结合检测常微量元素具有省时、省力、环境污染小,测定结果快速、准确等优点。     

Trace element concentration and its risk assessment in common kilka (Clupeonella cultriventris caspia Bordin, 1904) from southern basin of Caspian Sea

This study evaluated the extent of metal levels of zinc (Zn), copper (Cu), manganese (Mn), chromium (Cr), nickel (Ni), lead (Pb), cadmium (Cd), and mercury (Hg) in edible muscles of common kilka at Babolsar and Amirabad coastal regions from the southern basin of Caspian Sea. These values were compared with the WHO and the UNFAO safety standards regarding the amount of the abovementioned heavy metals in fish tissues (mg/kg w.w.). Results showed that Zn concentrations were highest among the trace elements examined, while concentrations of Hg were generally the lowest in the analyzed tissues. In the other hand, the accumulation of these elements was not significantly different between coastal regions (p?>?0.05). While accumulation of Cu and Mn at edible muscles of Clupeonella cultriventris were significant difference between two coastal regions (p??Cu?>?Cr?>?Cd?>?Ni?>?Mn?>?Pb?>?Hg. Furthermore, Pearson correlation revealed that Zn, Cu, Mn, Ni, Cr, Pb, Cd and Hg in edible muscles of C. cultriventris were not significantly correlated in length (R^2?<^?0.50; p?>?0.05), but it was significantly correlated in weight (p?C. cultriventris consumption.     

中药马齿苋的微量元素测定

本文报道用原子吸收分光光度法及等离子体发射光谱法测定马齿苋中二十一种微量元素的结果。     

石斛中微量元素的含量测定及其安全性评价

目的：建立测定石斛中微量元素含量的方法,从微量元素层面分析铁皮石斛、金钗石斛、流苏石斛、鼓槌石斛、球花石斛、迭鞘石斛的安全性,并探讨微量元素与石斛抗白内障、降血糖作用的关系。方法：采用电感耦合等离子体质谱（ICP-MS）法测定各石斛样品中6种必需微量元素镁、铁、锌、锰、铬、硒和5种重金属元素铜、砷、铅、汞、镉的含量,并对微量元素进行安全性评价和药效关系探讨。结果：所测样品中6种必需微量元素含量丰富,5种重金属元素中铅、镉、汞均有不同程度的超标现象。结论：《中国药典》中规定的12g·d-1石斛服用量所包含的微量元素符合美国食品和药物管理局每日微量元素推荐摄入量,不会引起必需微量元素中毒症。石斛中有害重金属含量不容乐观,建议加强中药的无公害种植。石斛中丰富的镁、锌、铁、锰、硒、铬微量元素可能与其抗白内障、降血糖作用有关。     

Analysis of essential elements in Pragya-peya--a herbal drink and its constituents by neutron activation

Ayurvedic herbal formulations are a good source of several nutrient elements essential for metabolic processes. Pragya-peya, a herbal drink and its 12 herbal constituents have been analyzed for 7 minor (Al, Ca, Cl, Mg, Na, K, P) and 15 trace (Ba, Br, Co, Cr, Cs, Fe, Hg, La, Mn, Rb, Sc, Se, Th, V, Zn) elements by instrumental neutron activation analysis (INAA). The method involves thermal neutron irradiation in a reactor followed by counting at several intervals. Also Cd, Cu, Ni and Pb contents were determined by atomic absorption spectrometry (AAS). Elemental data were validated by simultaneously analysing reference materials (RMs) such as mixed Polish herbs (INCT-MPH-2) and peach leaves (SRM-1547). Sample homogeneity was tested by analysing samples from three different batches collected at different intervals. Pragya-peya has been found to be especially rich in several nutrient elements such as Ca, K, V, Fe, Mn, Se and Zn whereas no single constituent is enriched in all the nutrient elements. Concentrations of elements are discussed vis-a-vis their medicinal/therapeutic uses. Several elements such as Na, K, P, Ca, Fe, Co, and Zn seem to be well correlated in 12 constituent herbs.     

Relationships between trace element concentrations in human blood and serum

Trace element interactions can affect the absorption, metabolism, or effects of elements. Also, different elements may derive from the same source. Associations in biological media between element concentrations may indicate such phenomena. A large number of correlations were found between 13 trace elements (Co, Cu, Zn, Se, Rb, Rh, Pd, Cd, W, Pt, Hg, Tl, and Pb) in human blood and/or serum, as investigated in 372 Swedish adolescents. Notably, serum Se correlated with blood Pb and blood Hg and Cu and Zn were correlated to each other in both blood and serum. The elements Pt, Pd and Rh, spread in the environment through use of catalytic converters in cars, were closely correlated in both blood and serum. Apart from the correlations with a probable biological or exposure-related explanation, several other correlations, of yet unknown importance and origin, were found.     

Essential trace and toxic element concentrations in organic and conventional milk in NW Spain

Dietary composition and husbandry practices largely determine essential trace element status and toxic element exposure of livestock, and consequently their concentrations in animal products. This study evaluates the main essential trace (Co, Cr, Cu, Fe, I, Mn, Mo, Ni, Se and Zn) and toxic (As, Cd, Hg and Pb) element concentrations in milk from organic and conventional farms in NW Spain (n = 50). Milk samples were acid digested and analyzed by ICP-MS. Essential trace element concentrations in organic milk were significantly lower compared to conventional milk, this was especially evident for elements that are routinely supplemented at high concentrations in the conventional concentrate feed: Cu (41.0 and 68.9 μg/L in organic and conventional milk, respectively), Zn (3326 and 3933 μg/L), I (78 and 265 μg/L) and Se (9.4 and 19.2 μg/L). Toxic metal concentrations in milk were in general very low and no statistically significant differences were observed between organic and conventional milk. In addition, the mineral content of organic milk showed a seasonal pattern, the significantly higher As (65%) and Fe (13%) concentrations found in the winter sampling possibly being related to a higher consumption of concentration feed and soil ingestion when grazing.     

海风藤不同部位微量元素的含量比较

目的:比较海风藤不同部位微量元素的含量。方法:用电感耦合等离子发射光谱法分别测定海风藤粗茎、细茎和叶3个部位中16种微量元素的含量,并对不同部位微量元素的含量进行比较。结果:海风藤叶中镁元素含量最高,其次为铁、锰、锌、钛、锶、钡、铅、硼、铜、镍、铬和镉;粗茎中钒的含量显著高于细茎和叶;细茎中只有锡元素含量高于粗茎和叶。结论:海风藤的叶和茎具有互补的药理作用。     

不同产地当归中金属微量元素的比较研究

目的：对不同产地当归中金属微量元素的含量进行初步的比较研究。方法：样品经微波消解后,以铟（In）元素为内标,利用电感耦合等离子体质谱（ICP-MS）测定不同产地的当归中Be、B、A l、V、Cr、Mn、Fe、Co、N i、Cu、Zn、As、Se、Cd、Ba、Hg和Pb等17种微量金属元素的含量。结果：该方法对各元素的检测线为0.003~2.478 ng/g,加样回收率为82.3%~112.2%,标准物质杨树叶的测定值与标示量基本吻合。结论：所建立的方法快捷,准确、灵敏度高,可以用于测定当归中金属的微量元素的含量,不同产地的当归其所含金属微量元素有很大不同,如某地产的当归有些元素含量明显高于其他地方。     

Comparison of the effects of metals on cellular injury and lipid peroxidation in isolated rat hepatocytes

Various mechanisms, including increases in lipid peroxidation, have been proposed to account for metal-induced cellular injury. By comparing several metals in the same cell population, it is possible to determine whether a correlation exists between ability to produce cell injury and ability to alter parameters pertaining to a particular mechanism. Of particular interest in this study was the relation between metal-induced cytotoxicity and increases in lipid peroxidation. The effects of Cr, Mn, Zn, Ni, Pb, Se, V, Fe, Cd, Hg, Cu, at final concentrations of 1-1000 microM, on the viability of isolated hepatocytes were therefore examined by assessing the loss of intracellular K+ and aspartate aminotransferase (AST). Simultaneously, the ability of the metals to induce lipid peroxidation, as measured by an increase in thiobarbituric acid (TBA) reactants, was assessed. Hg and Cu required the lowest concentration to produce cellular injury, while Cd produced less dramatic changes in cell viability and Fe at 1000 microM produced only a small decrease in intracellular K+. The largest absolute increases in lipid peroxidation were found in the presence of V, followed by Fe and Hg, with Cd and Se causing the smallest increase in TBA reactants. These observations suggest that the lipid peroxidation associated with Cd and Hg is not necessarily responsible for the loss of cell viability induced by these two metals.     

火焰原子吸收光谱法测定附子中微量元素的含量

目的:建立以空气-乙炔火焰原子吸收光谱法测定附子中铜(Cu)、铁(Fe)、锰(Mn)、铅(Pb)、镉(Cd)、铬(Cr)、锌(Zn)、镍(Ni)、钙(Ca)、镁(Mg)10种微量元素含量的方法。方法:样品经硝酸-高氯酸(4∶1)浸泡,置电热板上140℃消解处理。结果:测得各线性范围(μg·mL-1):Cu为0～3.0,Fe为0～4.0,Mn为0～1.0,Pb为0～5.0,Cd为0～0.25,Cr为0～4.0,Zn为0～2.0,Ni为0～5.0,Ca为0～4.0,Mg为0～4.0;相关系数均>0.9926;回收率在100.11%～102.62%之间;方法精密度的RSD在0.16%～2.2%之间。结论:该方法适合中药附子的Cu、Fe、Mn、Pb、Cd、Cr、Zn、Ni、Ca、Mg的含量测定,可为进一步研究附子中微量元素与其临床疗效关系提供有益依据。     

Inter-element interactions in human hair

The concentrations of 33 elements: Ca, Mg, Na, U, Cu, Zn, P, Fe, Mn, Cr, Se, B, Co, Mo, Si, V, Ni, Be, Hg, Cd, Al, Pb, As, Ba, Au, Pt, Ag, Sr, Sn, Ti, W, Sb and Zr in hair were determined by inductively coupled plasma-mass spectrometry (ICP-MS) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). Hair samples (n=83) were collected between 1996 and 2003 from inhabitants of city of Wroc?aw, located in Lower Silesia, south-west Poland (urbanized and industrialized region). Inter-element interactions were studied by evaluation of correlation coefficients between two elements, as well as by multiple regression analysis. The strongest relations found between the elements in the hair were as follows: Mg and Ca, Mn and Ca, Sr and Ca, Sr and Mg, U and Na, Ni and Zn, Mn and Sr, Cd and Ni, Sb and Pt. We obtained also the following essential linear multiple dependences (p<0.05): Al=f(U, P, Mn), As=f(Zn, Fe) (Zn is negatively correlated, β<0), Cu=f(V), Fe=f(Mn, As), Mg=f(Ca), Ca=f(Mg, Ba), Ni=f(Zn, Cd), Sb=f(Pt, Sn, W) and Ti=f(Fe, Co). These relations can be useful in the explanation of relationships among the elements in man.     

Relative in vitro affinity of hepatic metallothionein for metals

The ability of selected metals (Ag, Al, As, Ca, Cd, Co, Cr, Cu, Fe, Hg, Mg, Mn, Mo, Ni, Pb, Tl and V) to displace Zn from Zn-metallothionein (Zn-MT) was quantitated. Of the metals tested Cd had the highest affinity for MT, with 1.33 microM displacing 50% of the 65Zn bound to MT (EC50), followed by Pb (1.46 microM), Cu (1.93 microM), Hg (3.93 microM), Zn (8.06 microM), Ag (10.4 microM), Ni (474 microM) and Co (880 microM). As, Ca and Mo had a limited ability to displace Zn from MT while Al, Cr, Fe, Mg, Mn, Tl and V had no effect on Zn binding even at 1.0 mM.