Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 39
Filtrar
Mais filtros










Intervalo de ano de publicação
1.
J Trace Elem Med Biol ; 54: 21-26, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31109614

RESUMO

Environmental exposure to metals among women, revealed their adverse effects on pregnancy. The fetus is exposed to these toxic elements only via the placenta which are able to accumulate there or cross it, compromising the protective functions of this organ. Numerous studies have shown associations between the prenatal exposition to some metals and an impact on cognitive, motor and intellectual development of the child. Sixty two placental samples were taken at delivery to determine the mineral content (Al, B, Ba, Ca, Cd, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, Pb, Sr, V, Zn) by ICP-OES. Among these metals, essential ones (B, Ca, Cu, Fe, Mg, Mn, Mo, Na, Zn) can have health beneficial effects at low levels however, in high concentration are potentially toxic. On the other hand, elements such as Al, Cd, Pb, are classified as toxic metals, no matter what its concentration is. The aim of this study is to find the potential relationships between these metals levels, newborn's parameters, pregnancy details and the epidemiologic information obtained using a questionnaire data from the participant pregnant women from Seville (Spain). The main maternal determinant of detectable placenta Cd levels was smoking during pregnancy. Other maternal factors that may affect placenta metal levels were gestational age (Al, B, Ba, and Pb) or dietary supplement (Fe). It has to be stressed that our results have to be interpreted with caution, because of the small study group and the low exposure levels, along with the lack of information on potential sources of exposure to these metals. The use of placenta samples obtained at delivery can be considered strength of this study since the concentration of some metals in placenta can indicate the extent of maternal exposure during gestation.


Assuntos
Placenta/química , Oligoelementos/análise , Adulto , Exposição Ambiental/efeitos adversos , Monitoramento Ambiental , Feminino , Idade Gestacional , Humanos , Gravidez , Espanha
2.
J Food Prot ; 81(7): 1165-1170, 2018 07.
Artigo em Inglês | MEDLINE | ID: mdl-29939794

RESUMO

Seaweeds are being consumed more often worldwide and are a source of essential minerals, fiber, vitamins, amino acids, and various bioactive compounds that have many beneficial effects on human health. However, marine pollution and the high capacity of seaweed to absorb metals may mean this food can also be dangerous to human health. The concentrations of some trace elements (B, Ba, Fe, Ni, Li, and V) and toxic metals (Al, Cd, and Pb) were determined in various species of wild seaweeds in the Phaeophyta group of brown algae from the Atlantic Ocean. Inductively coupled plasma atomic emission spectrometry revealed high concentrations of Al (256 mg/kg dry weight), Pb (3.92 mg/kg dry weight), and Cd (0.20 mg/kg dry weight) in Padina pavonica. Pb contributed the most to the tolerable daily intake (TDI) of toxic metals in these samples; 57.2 and 45.3% of the TDI for Pb was found in 5 g of dehydrated P. pavonica and Halopteris scoparia, respectively. This percent contribution is half of the recommended TDI for this metal, which is 34.24 µg/day; therefore, high consumption of these species is discouraged. The maximum TDIs established by various institutions for the other metals were not exceeded from the daily consumption of 5 g of the other dehydrated seaweeds evaluated in this study.


Assuntos
Contaminação de Alimentos/análise , Metais/isolamento & purificação , Feófitas , Alga Marinha , Oceano Atlântico , Humanos , Feófitas/química , Feófitas/metabolismo , Alga Marinha/química , Alga Marinha/metabolismo , Espanha
3.
J Food Prot ; : 1867-1871, 2017 Oct 10.
Artigo em Inglês | MEDLINE | ID: mdl-28994612

RESUMO

Cephalopods are an important source of nutrients and some of the most widely consumed marine foods. However, because of contamination of the oceans and the bioaccumulative nature of toxic metals, these foods may pose a health risk. For this reason, the concentrations of some trace elements (chromium [Cr], lithium, strontium [Sr], copper [Cu], and nickel) and toxic metals (aluminum [Al], cadmium, and lead) were determined in 65 frozen samples of cuttlefish, octopus, common squid, and shortfin squid by inductively coupled plasma optical emission spectrometry to evaluate dietary intake and toxic risk. Sr was the major trace element (3.03 mg/kg) in cuttlefish; however, Cu (1.57 mg/kg) was found in the highest concentration in common squid. Among the toxic metals, Al had the highest concentration (3.09 mg/kg) in common squid. Al can pose an important health risk to individuals with kidney problems and to children because these groups are most vulnerable to the toxic effects. Significant differences among the four cephalopod types were found in the concentrations of most of the metals examined. Taking into account the average consumption of cephalopods, the contribution of toxic metals does not pose a risk to the health of adults.

4.
Chemosphere ; 173: 572-579, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-28152409

RESUMO

The concentration levels of 20 metals were analyzed by ICP-OES in edible seaweed (Chondrus, Eisenia, Gelidium, Himanthalia, Laminaria, Palmaria, Porphyra, Undaria), from two origins (Asia vs EU) according to their cultivation practices (conventional vs organic). Red seaweed showed higher concentrations of trace and toxic elements. Porphyra may be used as a potential bioindicator for metals. Significant differences were found between the Asian vs European mean contents. The mean Cd level from the conventional cultivation (0.28 mg/kg) was two points higher than the organic cultivation (0.13 mg/kg). A daily consumption of seaweed (4 g/day) contributes to the dietary intake of metals, mainly Mg and Cr. The average intakes of Al, Cd and Pb were 0.064, 0.001 and 0.0003 mg/day, respectively. Based on obtained results, this study suggests that exposure to the toxic metals analyzed (Al, Cd and Pb) through seaweed consumption does not raise serious health concerns, but other toxic metals should be monitored.


Assuntos
Contaminação de Alimentos/análise , Intoxicação por Metais Pesados , Metais/análise , Alga Marinha/química , Oligoelementos/análise , Ásia , Metais Pesados/análise , Envenenamento
5.
Nutr Hosp ; 32 Suppl 2: 10299, 2015 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-26615269
6.
J Food Prot ; 77(4): 659-64, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24680081

RESUMO

Monitoring the metal content in foods such as potatoes is an important aspect of food safety and regulation. Samples of nine varieties of potatoes (73 samples of local potatoes and 77 samples of imported potatoes) were randomly obtained from supermarkets, farmers markets, and farmer plots in Tenerife (Canary Islands, Spain). The edible portion (pulp) was the only part considered for analysis because Spaniards traditionally eat only peeled potatoes. Cadmium (Cd) and lead (Pb) were determined using graphite furnace atomic absorption spectrometry. Cd concentrations ranged from 0.006 mg/kg in the Cara and Negra varieties to 0.019 mg/kg in the Bonita variety, and Pb concentrations ranged from 0.007 mg/kg in the Up-to-date variety to 0.023 mg/kg in the Recara variety. The mean concentrations of Cd (0.01 mg/kg) and Pb (0.014 mg/kg) were below the limits established by European regulations for potatoes (0.1 mg/kg of wet weight for each metal). Based on a mean consumption of 143.2 g of potato per person per day for the Canary Islands population, the mean daily intakes of Cd (0.015 mg/day) and Pb (0.023 mg/day) were below the legislated respective tolerable weekly intakes. Thus, the samples analyzed were considered safe to eat with regard to the metal concentrations found.


Assuntos
Cádmio/análise , Contaminação de Alimentos/análise , Chumbo/análise , Solanum tuberosum/química , Cádmio/administração & dosagem , Qualidade de Produtos para o Consumidor , Humanos , Chumbo/administração & dosagem , Espanha , Espectrofotometria Atômica
7.
Nutr Hosp ; 29(3): 687-94, 2014 Mar 01.
Artigo em Espanhol | MEDLINE | ID: mdl-24559016

RESUMO

The contents of Na, K, Mg, Ca, Mn, Fe, Cu and Zn were analyzed and evaluated in 181 samples of various types of gofio produced from different roasted cereal grains. Samples were analyzed by ICP-OES. Based on a daily gofio intake of 30 g/day for adults and 15 g/day for children, the daily intake of each metal, and its percentage contribution to the RDAs established for the Spanish population, were estimated. The metal with the highest concentration was K (2189 ± 766 mg/kg). The lowest concentration was observed for Cu in corn gofio samples (2.05 ± 0.36 mg/kg). With respect to daily intake, it is noteworthy that gofio contributes significantly to the recommended allowance of copper (53.77%-71.45% of the RDI), depending on the population group considered and on the type of gofio.


Assuntos
Farinha/análise , Minerais/análise , Adulto , Criança , Humanos , Recomendações Nutricionais , Espanha , Triticum/química , Zea mays/química
8.
Nutr. hosp ; 29(3): 687-694, 2014. ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-120642

RESUMO

En este trabajo se ha estudiado la composición mineral de Na, K, Mg, Ca, Mn, Fe, Cu y Zn en 181 muestras de diversos tipos de gofio elaborados con diferentes cereales. Las muestras se analizaron mediante espectrometría de emisión óptica con plasma acoplado inductivamente (ICP-OES). Considerando un consumo medio diario de 30 g de gofio en adultos y de 15 g de gofio en niños, se estimaron las ingestas diarias de cada metal y sus contribuciones porcentuales a las IDRs establecidas para la población española. El elemento que presentó la mayor concentración de todos los estudiados fue el K en muestras de gofio de cereales, con una concentración media de2189 ± 766 mg/kg. El de menor concentración fue el Cu en muestras de gofio de maíz, con 2,05 ± 0,36 mg/kg. Con respecto a la ingesta, cabe destacar que el gofio contribuye de manera significativa a la ingesta de cobre (53,77%-71,45% de la IDR), en función del grupo de población que se trate y del tipo de gofio (AU)


The contents of Na, K, Mg, Ca, Mn, Fe, Cu and Zn were analyzed and evaluated in 181 samples of various types of gofio produced from different roasted cereal grains. Samples were analyzed by ICP-OES. Based on a daily gofio intake of 30 g/day for adults and 15 g/day for children, the daily intake of each metal, and its percentage contribution to the RDAs established for the Spanish population, were estimated. The metal with the highest concentration was K (2189 ± 766 mg/kg). The lowest concentration was observed for Cu in corn gofio samples (2.05 ± 0.36 mg/kg). With respect to daily intake, it is noteworthy that gofio contributes significantly to there commended allowance of copper (53.77%-71.45% of the RDI), depending on the population group considered and on the type of gofio (AU)


Assuntos
Humanos , Composição de Alimentos , Análise de Alimentos , Farinha/análise , Minerais na Dieta/análise , Análise Espectral/métodos , Ingestão de Alimentos
9.
Rev. toxicol ; 30(2): 125-131, jul.-dic. 2013. ilus
Artigo em Espanhol | IBECS | ID: ibc-126290

RESUMO

El sulfonato de perfluoroctano (PFOS) es un compuesto organofluorado y está considerado como un contaminante orgánico persistente. Atraviesa la barrera hematoencefálica y es capaz de incrementar su propio transporte a través de la misma, alcanzando así el sistema nervioso central, donde ejerce su toxicidad. El objetivo de este trabajo es evaluar la neurotoxicidad del PFOS en cuerpo estriado a nivel neuroquímico e histológico. Para ello, este xenobiótico se ha administrado oralmente durante 28 días a las dosis de 0, 0,5, 1; 3 y 6 mg/Kg/día en rata macho adulta, y tras el tratamiento, se ha determinado la concentración de los principales aminoácidos neurotransmisores en el cuerpo estriado y se ha hecho un estudio histológico de dicha región cerebral. Los animales tratados con PFOS muestran un incremento de la concentración de glutamina y un descenso del contenido de glutamato y aspartato. La concentración de ácido gamma-aminobutírico (GABA) y de taurina disminuye con la dosis de 1 mg/Kg/día, aumentando con la de 3 mg/Kg/día. PFOS induce también una degeneración celular dosis-dependiente, evidenciada por un aumento de la basofilia. Tras la exposición a dosis elevadas de PFOS (3 y 6 mg/Kg/día) se observa también satelitosis o acúmulo de los oligodendrocitos en este mismo tejido. Las alteraciones neuroquímicas e histológicas observadas en los animales tratados con PFOS podrían estar relacionadas con disfunciones a nivel cognitivo y emocional, así como con diversas patologías neurodegenerativas como la enfermedad de Parkinson (AU)


Perfluorooctane sulfonate (PFOS) is a fluorinated compound considered such as a persistent organic pollutant, which presents neurotoxicity. This chemical crosses the blood brain barrier and it is able to increase their own transportation through this structure, reaching the central nervous system, where it can induce toxicity. This work was undertaken to evaluate the possible effects of PFOS exposure in the corpus striatum at both neurochemical and histological levels. Adult male rats were orally treated with 0.5, 1, 3 and 6 mg of PFOS/Kg/day for 28 days. At the end of this treatment, the concentration of the main neurotransmitters amino acids has been determined in striatum and the possible morphological alterations have been studied in this same brain region. Animals treated with PFOS show an increase of glutamine concentration and a decrease of glutamate and aspartate content. Gamma-aminobutyric acid (GABA) and taurine concentration decreases with the dose of 1 mg/Kg/day, increasing with the dose of 3 mg/Kg/day. PFOS also induces a cellular dose-dependent degeneration. Furthermore, PFOS exposure at high doses (3 and 6 mg/kg/day) induces satellitosis in striatatal cells. These neurochemical and morphological alterations observed in adult male rat trated with PFOS could be related to cognitive and emotional dysfunctions as well as to several neurodegenerative pathologies such as Parkinson's disease (AU)


Assuntos
Animais , Masculino , Feminino , Corpo Estriado/química , Neuroquímica/métodos , Neuroquímica/organização & administração , Neuroquímica/normas , Exposição a Produtos Químicos , Epidemiologia Experimental , Desenvolvimento Experimental , Síndromes Neurotóxicas/complicações
10.
Nutr. hosp ; 27(5): 1605-1609, sept.-oct. 2012. tab
Artigo em Inglês | IBECS | ID: ibc-110194

RESUMO

Introduction: Tomato is considered a healthy food due to its high content in lycopene and other health-promoting natural compounds. Tomatoes have, undoubtedly, assumed the status of a food with functional properties, considering the epidemiological evidence of reducing the risk of certain types of cancers. Objective: Samples of tomatoes from Morocco were analyzed for the mineral composition. Methods: 94 tomato samples from Morocco were analyzed. Flame Atomic Absorption Spectrophotometry (FAAS) was used to determine essential elements (Copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn)) and Atomic Absorption Spectrophotometry with Graphite Furnace (GAAS) was used to analyzed cadmium (Cd) and lead (Pb). Results: The mean concentrations were 0.17 mg/kg, 0.73 mg/kg, 0.20 mg/kg, 0.44 mg/kg, 7.58 μg/kg and 15.8 μg/kg for Cu, Fe, Mn, Zn, Cd and Pb, respectively. The highest contribution to the intakes was observed for Cu (0.67% for adults) while that Zn showed the lowest contribution (0.14% for adult males and 0.20% for adult females). Conclusions: Tomatoes are a good source of essential elements for the diet, mainly iron and zinc. Tomatoes consumption does not significantly affect the intake of heavy metals (AU)


Introducción: El tomate es considerado un alimento saludable debido a su alto contenido en licopeno y otros componentes naturales promotores de salud. Indudablemente, los tomates han asumido el estatus de un alimento con propiedades funcionales, considerando desde un punto de vista epidemiológico reducir ciertos tipos de cánceres Objetivo: Analizar la composición mineral de muestras de tomates de Marruecos. Métodos: 94 muestras de tomates de Marruecos fueron analizadas. Espectrofotometría de Absorción Atómica por llama (FAAS) se usó para determinar elementos esenciales (Cobre (Cu), hierro (Fe), manganeso (Mn) y zinc (Zn) y Espectrofotometría de Absorción Atómica con cámara de grafito (GAAS) se usó para analizar cadmio (Cd) y plomo (Pb). Resultados: Las concentraciones medias fueron 0,17 mg/kg, 0,73 mg/kg, 0,20 mg/kg, 0,44 mg/kg, 7,58 μg/kg and 15,8 μg/kg para Cu, Fe, Mn, Zn, Cd y Pb, respectivamente. La contribución a la ingesta más alta fue observada para el Cu (0,67% para adultos) mientras que el Zn presentó la contribución más baja (0,14% para hombres adultos y 0,20% para mujeres adultas). Conclusión: Los tomates son una buena fuente de elementos esenciales para la dieta, principalmente hierro y zinc. El consumo de tomates no afecta significativamente a la ingesta de metales pesados (AU)


Assuntos
Humanos , Oligoelementos/análise , Metais Pesados/análise , Minerais na Dieta/análise , Lycopersicon esculentum/toxicidade , Concentrados de Tomates , Intoxicação do Sistema Nervoso por Metais Pesados/epidemiologia
11.
J Pharm Biomed Anal ; 71: 11-7, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-22906691

RESUMO

Phytopharmaceuticals are gaining popularity worldwide; however, cases of adverse effects and drug interactions have also increased. One reason is in the high metal content both as ingredients but also as contaminants. Metal monitoring in food, like herbal teas, provides basic information on safety aspects in regulatory processes as well as nutritional values. In the present work, Cd, Pb, K, Na, Ca, Mg, Al, B, Ba, Co, Cr, Cu, Fe, Mn, Zn, Li, Ni, and Mo were determined by inductively coupled plasma spectrometry (ICPS) in 36 samples of Mentha sp. Mint tea bags and loose leaves were randomly obtained from supermarkets, traditional markets, herbal stores, and pharmacies in Tenerife (Canary Islands, Spain). Metal contents varied significantly, dependent on the stores the products were purchased in and on tea packaging (loose leaves versus tea bags). Pb analyses revealed levels (0.65±0.71mg/kg) below legal limits. The maximum permissible limit for Cd, 0.3mg/kg, set by the WHO for medicinal plants, was exceeded by 19.44% of the samples (0.22±0.13mg/kg), but all values were below the limit given in the European Pharmacopoeia for this metal (4mg/kg). We observed high Al (151.24±162.73mg/kg) and Li (5.46±3.94mg/kg) levels. B, Ba, Co, Cr, Cu, Fe, Mn, Ni, Zn, and Mo mean levels were 20.51, 14.15, 0.26, 1.65, 10.65, 406.00, 55.05, 1.72, 33.67, and 0.73mg/kg, respectively. Mean Ca, Mg, K, and Na were detected in concentrations of 10.32, 3.83, 7.23 and 1.17g/kg, respectively. In conclusion, metal exposure through herbal mint teas does not seem to be of health concern, as to most of the studied metals, but regulatory limits for Al contents should be imposed.


Assuntos
Bebidas/análise , Mentha/química , Metais/análise , Oligoelementos/análise , Embalagem de Alimentos , Folhas de Planta/química , Análise Espectral/métodos , Chá/química
12.
Talanta ; 97: 325-30, 2012 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-22841087

RESUMO

Mangoes of uniform genetics (Lippens variety) cultivated in the Gomera Island (Canary Islands) by conventional and organic farming were used to analyze the mineral content in order to differentiate crops cultivated in the same geographic area by the cultivation practices. Farming differences as well as soil differences may be reflected in the mineral content of the mangoes cultivated in these extensions. Concentration metal profiles consisting of the content of Ca, Co, Cu, Fe, K, Mg, Mn, Na, Ni and Zn in mangoes were obtained by using atomic absorption spectrometry (AAS). Pattern recognition classification procedures were applied for discriminating purposes. Linear discriminant analysis (LDA) allows to a classification performance of about 73% and support vector machines (SVM) found up to a 93% of prediction ability. The classification success when applying support vector machines techniques is due to their ability for modeling non-linear class boundaries.


Assuntos
Mangifera/química , Mangifera/crescimento & desenvolvimento , Minerais/análise , Agricultura Orgânica , Máquina de Vetores de Suporte , Análise Discriminante
13.
Nutr Hosp ; 27(2): 548-52, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22732982

RESUMO

INTRODUCTION: Palm syrup is a typical product from the Canary Islands, traditionally produced from the sap of the tropical palm tree Phoenix canariensis. Its high caloric content has led to its increasing use as a health food supplement for athletes, children and elderly. Furthermore, demand for this natural syrup is continuously increasing due also to its medicinal uses in homeopathic medicine. OBJECTIVE: Palm Tree syrup samples prepared with palm sap from primary producers in La Gomera island (Canary Islands, Spain) were analyzed for their nutritional composition (moisture, ash, sugars, fat, vitamins and minerals). METHODS: 35 syrup samples from five different producing regions in La Gomera island were analyzed. High-performance liquid chromatography (HPLC) was used to determine sugars and vitamins and Flame Atomic Absorption Spectrophotometry (FAAS) was used to analyze the minerals. RESULTS: Major carbohydrates were sucrose (37.8%), glucose (9.50%) and fructose (4.80%), respectively. The presence of arabinose could not be confirmed. Niacin was the water-soluble vitamin with the highest concentration with an average content of 0.003%. Fat content was found to be under 0.20%. Potassium was the mineral with highest contents (0.45%). CONCLUSIONS: Results suggest that palm tree syrup can play an important role as a sugar and mineral source in human nutrition, suggesting that future applications for this product could be developed.


Assuntos
Arecaceae/química , Suplementos Nutricionais , Preparações de Plantas/química , Cromatografia Líquida de Alta Pressão , Carboidratos da Dieta/análise , Minerais/análise , Valor Nutritivo , Controle de Qualidade , Espectrofotometria Atômica , Vitaminas/análise
14.
Nutr. hosp ; 27(2): 548-552, mar.-abr. 2012. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-103439

RESUMO

Introduction: Palm syrup is a typical product from the Canary Islands, traditionally produced from the sap of the tropical palm tree Phoenix canariensis. Its high caloric content has led to its increasing use as a health food supplement for athletes, children and elderly. Furthermore, demand for this natural syrup is continuously increasing due also to its medicinal uses in homeopathic medicine. Objective: Palm Tree syrup samples prepared with palm sap from primary producers in La Gomera island (Canary Islands, Spain) were analyzed for their nutritional composition (moisture, ash, sugars, fat, vitamins and minerals). Methods: 35 syrup samples from five different producing regions in La Gomera island were analyzed. High-performance liquid chromatography (HPLC) was used to determine sugars and vitamins and Flame Atomic Absorption Spectrophotometry (FAAS) was used to analyze the minerals. Results: Major carbohydrates were sucrose (37.8%), glucose (9.50%) and fructose (4.80%), respectively. The presence of arabinose could not be confirmed. Niacin was the water-soluble vitamin with the highest concentration with an average content of 0.003%. Fat content was found to be under 0.20%. Potassium was the mineral with highest contents (0.45%). Conclusions: Results suggest that palm tree syrup can play an important role as a sugar and mineral source in human nutrition, suggesting that future applications for this product could be developed (AU)


Introducción: La miel de palma es un producto típico de las Islas Canarias, tradicionalmente producido a partir de la savia de la palmera Phoenix canariensis. El alto contenido calórico lo convierte en un producto cada vez más utilizado como suplemento alimenticio para atletas, niños y mayores. Además, la demanda de este sirope natural, está en constante crecimiento debido también a sus usos medicinales en la medicina homeopática. Objetivo: Analizar la composición nutricional (humedad, cenizas, azúcares, grasa, vitaminas y minerales) de las muestras de miel de palma preparadas con la savia de las palmeras de los productores de la isla de La Gomera (Islas Canarias, España). Métodos: 35 muestras de miel de palma procedentes de cinco regiones productoras de la isla de La Gomera fueron analizadas. Los azúcares y las vitaminas fueron medidos mediante cromatografía líquida de alta resolución (CLAR) y la espectrofotometría de absorción atómica por llama (FAAS) se usó para determinar los minerales. Resultados: Los hidratos de carbono mayoritarios fueron sacarosa (37,8%), glucosa (9,50%) y fructosa (4,80%), respectivamente. La presencia de arabinosa no pudo ser confirmada. La niacina es la vitamina hidrosoluble con la mayor concentración con un contenido promedio de 0,003%. Los contenidos en grasas se encontraron por debajo de 0,20%. El potasio era el macroelemento con los contenidos más altos (0,45%). Conclusiones: Los resultados sugieren que la miel de palma puede jugar un papel importante como una fuente de azúcar y minerales en la nutrición humana y se pueden desarrollar futuras aplicaciones para este producto (AU)


Assuntos
Humanos , Mel/análise , Valor Nutritivo , Análise de Alimentos/métodos , Cromatografia Líquida de Alta Pressão/métodos , Edulcorantes/análise
15.
Bull Environ Contam Toxicol ; 88(3): 358-61, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-22210446

RESUMO

Eight pesticide residues in tomato samples collected in the area of Souss Massa Valley (Southern Morocco) were analyzed. The detected residue levels ranged from 0.001 to 0.400 mg kg(-1) for dicofol, from 0.003 to 0.170 mg kg(-1) for procymidone, from 0.001 to 0.250 mg kg(-1) for chlorothalonil, from 0.050 to 0.500 mg kg(-1) for bifenthrin, from 0.001 to 0.010 mg kg(-1) for λ-cyhalothrin, from 0.001 to 0.300 mg kg(-1) for cypermethrin, from 0.010 to 1 mg kg(-1) for deltamethrin and from 0.003 to 1.123 mg kg(-1) for endosulfan. European MRL for endosulfan in tomatoes set in 0.500 mg kg(-1), was exceeded in 8 samples, and MRL for deltamethrin set in 0.300 mg kg(-1) for tomatoes was exceeded in 2 samples.


Assuntos
Jardinagem/estatística & dados numéricos , Lycopersicon esculentum/química , Resíduos de Praguicidas/análise , Compostos Bicíclicos com Pontes/análise , Dicofol/análise , Endossulfano/análise , Monitoramento Ambiental , Marrocos , Nitrilos/análise , Piretrinas/análise
16.
Nutr Hosp ; 27(5): 1605-9, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-23478712

RESUMO

INTRODUCTION: Tomato is considered a healthy food due to its high content in lycopene and other health-promoting natural compounds. Tomatoes have, undoubtedly, assumed the status of a food with functional properties, considering the epidemiological evidence of reducing the risk of certain types of cancers. OBJECTIVE: Samples of tomatoes from Morocco were analyzed for the mineral composition. METHODS: 94 tomato samples from Morocco were analyzed. Flame Atomic Absorption Spectrophotometry (FAAS) was used to determine essential elements (Copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn)) and Atomic Absorption Spectrophotometry with Graphite Furnace (GAAS) was used to analyzed cadmium (Cd) and lead (Pb). RESULTS: The mean concentrations were 0.17 mg/kg, 0.73 mg/kg, 0.20 mg/kg, 0.44 mg/kg, 7.58 µg/kg and 15.8 µg/kg for Cu, Fe, Mn, Zn, Cd and Pb, respectively. The highest contribution to the intakes was observed for Cu (0.67% for adults) while that Zn showed the lowest contribution (0.14% for adult males and 0.20% for adult females). CONCLUSIONS: Tomatoes are a good source of essential elements for the diet, mainly iron and zinc. Tomatoes consumption does not significantly affect the intake of heavy metals.


Assuntos
Substâncias Perigosas/análise , Lycopersicon esculentum/química , Metais/análise , Oligoelementos/análise , Adulto , Feminino , Humanos , Masculino , Metais Pesados/análise , Marrocos , Controle de Qualidade , Espectrofotometria Atômica
17.
J Food Prot ; 74(11): 1938-43, 2011 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-22054198

RESUMO

The aim of this study was to determine the levels of metals (Ca, K, Na, Mg) and trace metals (Ni, Fe, Cu, Mn, Zn, Pb, Cd) in two fish species (gilthead bream [Sparus aurata] and sea bass [Dicentrarchus labrax]) collected from fish farms located along the coast of Tenerife Island. Ca, K, Na, Mg, Fe, Cu, Zn, and Mn were measured by flame atomic absorption spectrometry, whereas Pb, Cd, and Ni were determined using graphite furnace atomic absorption spectrometry. Mean Fe, Cu, Mn, and Zn contents were 3.09, 0.59, 0.18, and 8.11 mg/kg (wet weight) in S. aurata and 3.20, 0.76, 0.24, and 10.11 mg/kg (wet weight) in D. labrax, respectively. In D. labrax, Ca, K, Na, and Mg levels were 1,955, 2,787, 699.7, and 279.2 mg/kg (wet weight), respectively; in S. aurata, they were 934.7, 3,515, 532.8, and 262.8 mg/kg (wet weight), respectively. The Pb level in S. aurata was 7.28 ± 3.64 µg/kg (wet weight) and, in D. labrax, 4.42 ± 1.56 µg/kg (wet weight). Mean Cd concentrations were 3.33 ± 3.93 and 1.36 ± 1.53 µg/kg (wet weight) for D. labrax and S. aurata, respectively. All Pb and Cd levels measured were well below the accepted European Commission limits, 300 and 50 µg/kg for lead and cadmium, respectively.


Assuntos
Aquicultura , Bass/metabolismo , Metais/metabolismo , Dourada/metabolismo , Alimentos Marinhos/normas , Oligoelementos/metabolismo , Animais , Qualidade de Produtos para o Consumidor , Humanos , Metais/análise , Espanha , Especificidade da Espécie , Espectrofotometria Atômica , Oligoelementos/análise
18.
J Food Prot ; 72(9): 1941-7, 2009 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-19777898

RESUMO

This study analyzed the content of gamma-emitting radionuclides in fish farmed on the island of Tenerife (Canary Islands, Spain). The fish species included in this study were sea bass, gilthead bream, and rainbow trout. The first two species are produced in offshore enclosures, while the third is produced in a freshwater fish farm. All measurements were performed using two high-purity germanium gamma-ray detectors. The content of gamma-emitting radionuclides in the fodder used to feed the different species of farmed fish studied was also determined. The following nuclides were often detected in the analyzed samples: 137Cs, 40K, 235U, 228Ac, 214Bi, 208Tl, 212Pb, and 214Pb. As a complement to this analysis, 210Po concentrations in two fish samples were determined by alpha spectrometry. The nuclide presenting the highest concentration was, as expected, the naturally occurring 40K, with an average concentration of 0.13 +/- 0.01 Bq/g (wet weight) (Bq/gww) in gilthead bream and sea bass and 0.12 +/- 0.01 Bq/gww in rainbow trout. The 235U concentrations determined in the same fish species were 0.6 +/- 0.5, 0.8 +/- 0.7, and 1.6 +/- 1.0 mBq/gww, respectively. This nuclide is seldom reported in fish samples. The concentrations of 137Cs (the only artificial nuclide determined in this study) in gilthead bream and sea bass were 0.026 +/- 0.006 and 0.044 +/- 0.01 mBq/gww, respectively. In addition to the radiometric analysis, the contribution of the analyzed nuclides to the effective dose from the mean daily intake of the fish was calculated. The calculated contribution, in terms of dose per person, produced by intake of the analyzed fish was 0.8 microSv/year. This value does not represent a significant risk to the local population.


Assuntos
Contaminação de Alimentos/análise , Radioisótopos/análise , Radiometria/métodos , Alimentos Marinhos/análise , Poluentes Químicos da Água/análise , Animais , Bass , Monitoramento Ambiental , Pesqueiros , Humanos , Oncorhynchus mykiss , Dourada , Espanha , Especificidade da Espécie
19.
Cuad. med. forense ; 15(57): 207-213, jul. 2009. tab
Artigo em Espanhol | IBECS | ID: ibc-94633

RESUMO

El asbesto o amianto está constituido por un grupo de minerales metamórficos fibrosos ampliamente extendidos en el mundo. Las principales variedades de asbesto son las serpentinas y los anfíboles. El asbesto llega al organismo al inhalar sus fibras y partículas. La exposición a este material puede ocasionar diferentes enfermedades irreversibles como asbestosis, mesotelioma maligno, placas pleurales y cáncer de pulmón. Todas ellas presentan un período de latencia largo. En 1978 el asbesto fue declarada sustancia cancerígena siendo totalmente prohibido su uso en España en el año 2002 (AU)


Asbest is a group of fibrous metamorphic minerals widespread in the world. The principal varieties of asbestos are serpentines and amphiboles. Asbest reaches human when the fiber an particles are inhaled. The exposure can cause irreversible diseases, like asbestosis, malignant mesothelioma, pleural plaques and lung cancer. All of them have a long latency period. In 1978, asbest was considered a carcinogenic substance and was totally forbidden in Spain during 2002 (AU)


Assuntos
Humanos , Asbestos/envenenamento , Neoplasias Pulmonares/induzido quimicamente , Asbestose/complicações , Mesotelioma/induzido quimicamente
20.
Artigo em Inglês | MEDLINE | ID: mdl-18629690

RESUMO

Estimating the risk associated with dietary intake of heavy metals by consumers is a vital and integral part of regulatory processes. The assessment of exposure to mercury shown in this paper has been performed by means of a study on the whole diet. Total mercury (Hg) levels were determined by cold vapour atomic absorption spectrometry (AAS) in 420 samples of regularly consumed food and drink. The total Hg concentrations measured in the different groups of food ranged from non-detectable to 119 microg kg(-1) w/w. The fish group had the highest concentrations of total Hg. All groups of food with regulated Hg content showed levels that were lower than the legally set values. The food consumption data used in the analysis were taken from the latest nutritional survey made in the Canary Islands, Spain. The estimated total Hg intake of local population (5.7 microg/person day(-1)) did not exceed the provisional tolerable weekly intake (PTWI) limit of 0.3 mg week(-1) of total mercury (43 microg/person day(-1)) fixed by the Joint Food and Agricultural Organization/World Health Organization (FAO/WHO) Expert Committee on Food Additives. Fishery products contributed 96% of the total Hg intake. The mean Hg intake for each island in this archipelago, formed by seven, has also been calculated. Fuerteventura, Lanzarote and El Hierro are the islands with the highest level of Hg intake (7.0, 7,0 and 6.1 microg/person day(-1), respectively). La Palma Island, due to its low fish consumption, had the lowest level of Hg intake (4.5 microg/person day(-1)), followed by La Gomera (5.4 microg/person day(-1)), Tenerife (5.5 microg/person day(-1)) and Gran Canaria (5.6 microg/person day(-1)). A comparison has been made of the results obtained in this study with those found for other national and international communities.


Assuntos
Contaminação de Alimentos/análise , Mercúrio/análise , Animais , Peixes , Humanos , Carne/análise , Compostos de Metilmercúrio/análise , Leite/química , Medição de Risco/métodos , Alimentos Marinhos/análise , Espanha , Espectrofotometria Atômica
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA