137 research outputs found
Green sample preparation strategies for organic/inorganic compounds in environmental samples
A rigorous evaluation of environmental contamination requires constant innovation in analytical approaches to gain early identification and accurate quantification of every substance able to compromise health and well-being. Particularly, when trace analysis of organic and inorganic contaminants, and their species, in complex environmental samples is required. The analytical process comprises several steps, above all sample treatment, involving isolation of analytes, purification of extracts and preconcentration, often constitute the most time and labor consuming part. This review provides an overview in sample-treatment procedures applied for the analysis of organic and inorganic compoundsin environmental samples in recent years. The current state of the art is emphasized on those techniques and approaches that have already demonstrated their sufficient analytical performance.Fil: Cerutti, Estela Soledad. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Pacheco, Pablo Hugo. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Gil, Raul Andres. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Martinez, Luis Dante. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; Argentin
A novel on-line preconcentration method for trace molybdenum determination by USN-ICP OES with biosorption on immobilized yeasts
A new system for on-line preconcentration of molybdenum by sorption on a minicolumn associated to inductively coupled plasma - optical emission spectrometry with ultrasonic nebulization was studied. It is based on the sorption of molybdenum on a column packed with immobilized baker's yeasts on controlled pore glass without further complexing reagent. The molybdenum preconcentrated by biosorption was subsequently eluted with hydrochloric acid. Considering a sample flow rate of 5.0Â mL min- 1, 10Â mL of sample was preconcentrated in 2Â min achieving a sensitive total enhancement factor of 480-fold, and the detection limit (3Â s) obtained was 21Â ng L- 1. Additionally, the calculated precisions expressed as percent relative standard deviation (RSD%) was 1.9%. Satisfactory results were obtained for the determination of molybdenum in standard reference material NIST 1643e Trace Elements in Water and real water samples.Fil: Gil, Raul Andres. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Pasini Cabello, Sergio David. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Departamento de QuĂmica. Ărea de QuĂmica AnalĂtica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Takara, Eduardo Andres. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Departamento de QuĂmica. Ărea de QuĂmica AnalĂtica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Smichowski, Patricia Nora. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. ComisiĂłn Nacional de EnergĂa AtĂłmica; ArgentinaFil: Olsina, Roberto Antonio. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Martinez, Luis Dante. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; Argentin
Optimization of methods to assess levels of As, Bi, Sb and Se in airborne particulate matter by FI-HG-ICP OES
A study was undertaken to assess the level of selected trace elements namely, As, Bi, Sb and Se in airborne particulate matter collected on ash-free glass-fibre filters from urban and industrial areas of Argentina. For sample digestion, a simple acid treatment with HCl + HF is proposed with the aim to minimize contamination and reduce sample treatment steps. A flow injection-hydride generation system in combination with inductively coupled plasma optical emission spectrometry was used. While, Se and Bi could be determined directly from the digest, As and Sb needed a pre-reduction with KI, and H3BO3 to avoid the interference of F- ions that may cause losses via volatile compounds such as AsF3 and Sb(v) complexes. Limits of detection (3Ï) of 0.3 ng m-3 for As; 0.09 ng m-3 for Bi, and 0.1 ng m-3 for Sb and Se were achieved. Precision resulted in better than 6.1% accuracy for all the elements determined. Accuracy test was assessed by means of the certified reference material, NIST 1648 (urban particulate matter).Fil: Savio, Marianela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Pacheco, Pablo Hugo. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Martinez, Luis Dante. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Smichowski, Patricia Nora. ComisiĂłn Nacional de EnergĂa AtĂłmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Gil, Raul Andres. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; Argentin
Ultratrace arsenic determination through hydride trapping on oxidized multiwall carbon nanotubes coupled to electrothermal atomic absorption spectrometry
Arsenic determination in natural waters is an issue of current research. This article reports a novel hydride generation (HG) approach developed for As determination with electrothermal atomic absorption spectrometry (ETAAS) detection. The HG process was interfaced with ETAAS through hydride trapping onto a carbon nanotubes microcolumn. To this end a homemade gas-liquid separator was used, allowing arsine formation and its flow throughout the CNT microcolumn. The retention process involved thus a solid phase extraction from the gas phase to the solid support. Once arsine generation was completed, the elution was carried out with nitric acid directly onto the dosing hole of the graphite furnace. Outstanding sensitivity with detection limit of 1 ng L-1, quantification limit of 5 ng L-1 and the characteristic mass, 5.8 ± 0.4 pg could be achieved. A satisfactory correlation between concentration of As and absorbance (R = 0.9993) from the limit of quantification up to 500 ng L-1, with a relative standard deviation of 6.3% were obtained. A sensitive enhancement factor of 38 was reached when 2 mL of sample were processed and 50 ÎŒL of HNO3 were used as eluent. The system was successfully applied to the analysis of a standard reference material, QC LL2 metals in natural waters. In addition tap water analysis provided an As concentration of 0.29±0.03 ÎŒg L-1.Fil: Maratta MartĂnez, Sergio Ariel. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico San Luis. Instituto de QuĂmica de San Luis; ArgentinaFil: Acosta, Mariano. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico San Luis. Instituto de QuĂmica de San Luis; ArgentinaFil: Martinez, Luis Dante. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico San Luis. Instituto de QuĂmica de San Luis; ArgentinaFil: Pacheco, Pablo Hugo. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico San Luis. Instituto de QuĂmica de San Luis; ArgentinaFil: Gil, Raul Andres. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico San Luis. Instituto de QuĂmica de San Luis; Argentin
Handling spectral interferences and matrix effects in DRC-ICPMS to assess the elemental profile in human serum samples after dissolution with formic acid
Inductively coupled plasma mass spectrometry instrumentation along with the dynamic reaction cell (DRC) technology has been increasingly used in the last decade for multielemental analysis of biological samples. This work reports the development of a method to assess concentrations of Li, Be, B, Sc, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Rb, Cd, Sr, Mo, Pd, Ag, Sb, Te, Cs, Ba, Os, Tl, Pb, and Bi in human serum samples treated with formic acid. This is a single-step procedure that minimizes sample handling and avoids contamination risks and analyte losses. Towards this aim, several experimental conditions such as sample pretreatment with formic acid and instrumental operating parameters were optimized. Interferences due to polyatomic ions were eliminated using DRC with oxygen as reaction gas through the formation of MO+ ions. Our method involved low dilution factors, and appropriate limits of detection in the low ÎŒg L-1 range for all elements. The accuracy was evaluated through the analysis of a standard reference material (Inorganic Constituents in Animal Serum, NIST 1598a) and spiked samples, with satisfactory recoveries.Fil: Verni, Ernesto Ricardo. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Departamento de QuĂmica. Ărea de QuĂmica AnalĂtica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Moyano, Mario Franco. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Departamento de QuĂmica. Ărea de QuĂmica AnalĂtica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Martinez, Luis Dante. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Departamento de QuĂmica. Ărea de QuĂmica AnalĂtica; ArgentinaFil: Lapierre, Alicia Viviana. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Departamento de QuĂmica. Ărea de QuĂmica AnalĂtica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Gil, Raul Andres. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Departamento de QuĂmica. Ărea de QuĂmica AnalĂtica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; Argentin
Online solid phase extraction-HPLC-ICP-MS system for mercury and methylmercury preconcentration using functionalised carbon nanotubes for their determination in dietary supplements
A hyphenated system was developed for Hg(ii) and methylmercury (MeHg) preconcentration and speciation analysis by the online coupling of solid phase extraction (SPE), high performance liquid chromatography (HPLC) and inductively coupled plasma mass spectrometry (ICP-MS). Both analytes, Hg(ii) and MeHg, were preconcentrated on a microcolumn filled with multiwalled carbon nanotubes (MWCNTs) functionalised with poly-l-methionine (polymet-MWCNTs). During the method development the sorbent material was carefully studied and the solid phase extraction conditions were optimised. An enrichment factor of 190 for Hg(ii) and MeHg was obtained when 20 mL of sample was passed through the microcolumn. For the chromatographic separation, a mobile phase composed of a ternary mixture of 0.5% formic acid + 0.2% 2-mercaptoethanol + 20% methanol was used. Separation of both mercurial species was accomplished in âŒ10 min on a 250 mm C18 column. The detection limits of the SPE-HPLC-ICP-MS method were 15 ng Lâ1 for Hg(ii) and 17 ng Lâ1 for MeHg. The relative standard deviations of peak area for 5 ng Lâ1 of each Hg species were below 5%. Recoveries of Hg(ii) and MeHg were never less than 93%. For checking the accuracy, BCR 643-tuna fish and TORT-3 lobster hepatopancreas certificate reference materials were analysed. Mercury species were determined in spiked fish oil-based dietary supplements and Antarctic water.Fil: Londonio, Juan AgustĂn. ComisiĂłn Nacional de EnergĂa AtĂłmica; Argentina. Universidad Nacional de San MartĂn. Instituto de InvestigaciĂłn en IngenierĂa Ambiental; ArgentinaFil: Hasuoka, Paul Emir. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Pacheco, Pablo Hugo. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Gil, Raul Andres. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Smichowski, Patricia Nora. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. ComisiĂłn Nacional de EnergĂa AtĂłmica; Argentin
Slurry sampling in serum blood for mercury determination by CV-AFS
The heavy metal mercury (Hg) is a neurotoxin known to have a serious health impact even at relatively low concentrations. A slurry method was developed for the sensitive and precise determination of mercury in human serum blood samples by cold vapor generation coupled to atomic fluorescence spectrometry (CV-AFS). All variables related to the slurry formation were studied. The optimal hydrochloric concentration and tin(II) chloride concentration for CV generation were evaluated. Calibration within the range 0.1-10 ÎŒg L-1 Hg was performed with the standard addition method, and compared with an external calibration. Additionally, the reliability of the results obtained was evaluated by analyzing mercury in the same samples, but submitted to microwave-assisted digestion method. The limit of detection was calculated as 25 ng L-1 and the relative standard deviation was 3.9% at levels around of 0.4 ÎŒg L-1 Hg.Fil: Aranda, Pedro Rodolfo. Universidad Nacional de San Luis; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Gil, Raul Andres. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Moyano, Susana. Universidad Nacional de San Luis; ArgentinaFil: de Vito, Irma Esther. Universidad Nacional de San Luis; ArgentinaFil: Martinez, Luis Dante. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Universidad Nacional de San Luis; Argentin
Assessment of Agricultural Practices in Maize Crops (Zea mays) Based on Elemental Profile and Chemometrics Analysis
In this work the effects produced by two treatments onmaize crop samples have been studied. Analysis of maize grain based on twotypes of agronomical conditions was performed on: (a) lots treated withdifferent fertilizers and (b) lots with different crop density. Analysis wascarried out by microwave induced plasma with optical emission spectrometry (MIPOES) and included the quantification of 11 elements: Ca, Cd, Cr, Cu, Fe, Mg,Mn, Ni, P, Pb and Zn. With the purpose of understand the effect of agriculturalpractices on elemental profile, principal components analysis (PCA) and clusteranalysis (CA) were used as chemometrics tools, finding a correct grouping ofeach crop based on the type of treatment. The obtained models can be useful toevaluate agricultural strategies, as well as for determining potential yieldsin maize crops.Fil: Zaldarriaga Heredia, Jorgelina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Moldes, Carlos Alberto. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Savio, Marianela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Azcarate, Silvana Mariela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Gil, Raul Andres. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Camiña, JosĂ© Manuel. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentin
Estudios de bioaccesibilidad de Fe, Cu y Zn de suplementos dietarios de espirulina con diferente composiciĂłn de excipiente y forma de dosificaciĂłn
Contexto: La cianobacteria espirulina es un complemento alimenticio segĂșn su alto valor nutricional. Sin embargo, la bioaccesibilidad (Bac) de nutrientes como Fe, Cu y Zn de la espirulina puede verse afectada por los excipientes y las formulaciones de suplementos. Objetivos: Evaluar la Bac de Fe, Cu y Zn de diferentes presentaciones comerciales de suplementos dietĂ©ticos basados en espirulina de acuerdo con excipientes y formulaciones. MĂ©todos: Se realizaron estudios microscĂłpicos para estudiar el contenido de espirulina en suplementos dietĂ©ticos. Las concentraciones totales de Fe, Cu y Zn se determinaron por espectrometrĂa de masas de plasma acoplado inductivamente (ICP-MS). Bac se calculĂł como la relaciĂłn entre la concentraciĂłn de metal total y la concentraciĂłn de metal despuĂ©s de la digestiĂłn gastrointestinal in vitro. Resultados: La concentraciĂłn de fragmentos de espirulina en los suplementos dietĂ©ticos analizados fue diferente, correspondiendo a 2.21 109 â 4.46 109 fragmentos de cĂ©lulas/g (p = 0.021; 95% de confianza). Las concentraciones de Fe, Cu y Zn en los suplementos dietĂ©ticos de espirulina variaron entre 63 ± 1 â 1066 ± 7 ”g/g, 1.8 ± 0.1 â 187.9 ± 1.9 ”g/g y 3.0 ± 0.3 â 57.3 ± 0.6 ”g/g, respectivamente. Bac de Fe, Cu y Zn fueron mayores en la etapa de digestiĂłn intestinal en muestras con un alto recuento de espirulina. Bac de Fe fue menor en tabletas. Bac de Cu fue mayor en la fase oral que en la fase intestinal cuando Cu estĂĄ presente en los excipientes y no en la espirulina. Bac de Zn disminuye cuando se introduce estearato de Mg como excipiente. Conclusiones: La Bac de Fe, Cu y Zn de los suplementos dietĂ©ticos de espirulina se vio afectado por la composiciĂłn de los excipientes y por la forma de dosificaciĂłn sĂłlida. Las diferentes presentaciones comerciales de espirulina afectan su valor nutricional.Context: The cyanobacteria Spirulina is a food supplement according to its high nutritional value. However, the bioaccesibility (Bac) of nutrients like Fe, Cu and Zn from Spirulina can be affected by excipients and formulations of supplements. Aims: To evaluate the Bac of Fe, Cu and Zn from different commercial presentations of Spirulina-based dietary supplements according to excipients and formulations. Methods: Microscopic studies were performed to study Spirulina content in dietary supplements. Total Fe, Cu and Zn concentrations were determined by Inductively Coupled Plasma Mass Spectrometry (ICPMS). Bac was calculated as the ratio between total metal concentration and the metal concentration after in vitro gastrointestinal digestion. Results: The Spirulina fragments concentration in the analyzed dietary supplements were different, corresponding to 2.21 109 â 4.46 109 cell fragments/g (p = 0.021; 95% confidence). Fe, Cu and Zn concentrations in Spirulina dietary supplements ranged from 63 ± 1 â 1066 ± 7 ”g/g, 1.8 ± 0.1 â 187.9 ± 1.9 ”g/g and 3.0 ± 0.3 â 57.3 ± 0.6 ”g/g, respectively. Fe, Cu and Zn Bac were higher in the intestinal digestion stage in samples with high Spirulina count. Fe Bac was lower in tablets. Cu Bac was higher in the oral phase rather than the intestinal phase when Cu is present in excipients and not in Spirulina. Zn Bac decreases when Mg stearate is introduced as an excipient. Conclusions: The Bac of Fe, Cu, and Zn from Spirulina dietary supplements showed to be affected by excipients composition and by the solid dosage form. The different commercial presentations of Spirulina affect their nutritional value.Fil: Principe, MarĂa Virginia. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Permigiani, Isis Sabrina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Della Vedova, Maria Cecilia. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Petenatti, Elisa Margarita. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto Multidisciplinario de Investigaciones BiolĂłgicas de San Luis. Universidad Nacional de San Luis. Facultad de Ciencias FĂsico MatemĂĄticas y Naturales. Instituto Multidisciplinario de Investigaciones BiolĂłgicas de San Luis; ArgentinaFil: Pacheco, Pablo Hugo. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Gil, Raul Andres. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; Argentin
Diuretic activity of aqueous extract and betulin from Colliguaja integerrima in rats
Five known compounds were isolated from the aerial parts of Colliguaja integerrima Gillies & Hook (Euphorbiaceae). A pharmacological evaluation of the diuretic activity of the plant was carried out in isotonic saline-loaded rats. The data reported in the present work indicate that the aqueous extract of the aerial parts from C. integerrima showed a moderate diuretic activity. The urinary levels of sodium and potassium are increased by treatment with C. integerima aqueous extract. This activity could be due, in part, to the presence of betulin isolated as the major metabolite of C. integerrima.Fil: Alvarez, MarĂa E.. Universidad Nacional de San Luis; ArgentinaFil: Gil, Raul Andres. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Acosta, Maria Gimena. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de QuĂmica de San Luis. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de QuĂmica de San Luis; ArgentinaFil: Saad, JosĂ© Roberto. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Departamento de QuĂmica. Area de QuĂmica OrgĂĄnica; ArgentinaFil: Borkowski, Eduardo Jorge. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de Investigaciones en TecnologĂa QuĂmica. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de Investigaciones en TecnologĂa QuĂmica; ArgentinaFil: MarĂa, Alejandra O. M.. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Departamento de QuĂmica. Area de QuĂmica OrgĂĄnica; Argentin
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