VERA AKIKO MAIHARA

Resumo

Possui graduação em Bacharelado Em Química pela Universidade de São Paulo (1981), mestrado em Tecnologia Nuclear pela Universidade de São Paulo (1985) e doutorado em Tecnologia Nuclear pela Universidade de São Paulo (1996). Atualmente é pesquisador da Comissão Nacional de Energia Nuclear. Tem experiência na área de Química, com ênfase em Química Nuclear e Radioquímica, atuando principalmente nos seguintes temas: analise por ativação, elementos essenciais e tóxicos, analise de traço, avaliação dietética e alimentos. Orientador de doutorado e mestrado. (Texto extraído do Currículo Lattes em 27 dez. 2021)

Projetos de Pesquisa
Unidades Organizacionais
Cargo

Resultados de Busca

Agora exibindo 1 - 10 de 215
  • Artigo IPEN-doc 28771
    Estimation of daily dietary intake of essential minerals and trace elements in commercial complementary foods marketed in Brazil
    2022 - VALLINOTO, PRISCILA; MOREIRA, EDSON G.; MAIHARA, VERA A.
    Eating habits influence health and development throughout life and commercial complementary foods are an important part of the diet for many infants. In this study, Ca, Fe, K, Mn, Mg, Na, Se and Zn were determined in twenty-seven Brazilian commercial complementary foods samples by Instrumental Neutron Activation Analysis. Daily dietary intakes of the elements were estimated in three groups aged 6–8 months, 9–11 months and 12–24 months from breastfed and non-breastfed infants and young children. Non-breastfed children presented higher daily dietary intakes for all elements. Daily dietary intakes of Fe, Mg, Mn, Na and Zn did not meet the recommended values for the 6–8 and 9–11 months for the breastfeeding group. Ca, K, Mg, Mn, Na and Zn dietary intakes were below the recommended values for 12–24 months for breastfeeding group. Se daily dietary intakes were inadequate in all studied groups. No investigated element exceeded the upper limits. It was observed that the commercial infant food analyzed do not provide sufficient amount of essential minerals and trace elements for the child healthy development in accordance to the international health recommendations.
  • Capítulo IPEN-doc 28724
    Caracterização multielementar de alimentos e dietas regionais empregando a técnica de análise por ativação com nêutrons
    2022 - MAIHARA, V.A.
    Durante as últimas décadas, a crescente demanda por segurança alimentar tem estimulado pesquisas sobre o risco associado ao consumo de alimentos contaminados por pesticidas, elementos tóxicos e /ou toxinas. Por outro lado, também há a preocupação de saber se os alimentos de uma determinada dieta estão suprindo a ingestão de elementos nutricionalmente importantes para a saúde. Desde 1982, o Laboratório de Análise por Ativação tem realizado pesquisas na área nutricional e tem empregado os métodos de Análise por Ativação com Nêutrons, Espectrometria Gama, Espectrometria de Absorção Atômica e Espectrometria de Emissão Atômica para avaliar os teores de elementos essenciais (Ca, Cl, Co, Cr, Cu, Mg, Mn, Fe, K, I, Na, Se e Zn), tóxicos (As, Cd, Hg e Pb) e de radionuclídeos naturais das séries do 238U e 232Th presentes em diversos alimentos e em dietas de grupos populacionais de crianças, estudantes, trabalhadores e de cidade como São Paulo e Poços de Caldas.
  • Capítulo IPEN-doc 28717
    Avaliação de elementos essenciais e tóxicos em algas marinhas comestíveis e em seus derivados usados na indústria alimentícia
    2022 - ALBUQUERQUE, C.R.; MAIHARA, V.A.; SILVA, P.S.C.
    As algas marinhas comestíveis podem ser consideradas como alimento funcional e contribuem para as necessidades nutricionais humanas, sendo benéficas para a saúde humana. As algas podem ser utilizadas como bioindicadoras de contaminação ambiental, pois possuem alta capacidade de absorver e armazenar determinados elementos potencialmente tóxicos como o As. Neste estudo, os elementos As, Br, Ca, Co, Cr, Fe, e Zn foram determinados pelo método de Análise por Ativação com Nêutrons Instrumental (INAA) em 21 amostras de algas marinhas comestíveis de quatro espécies Porphyra umbilicalis (Nori), Hijikia fusiforme (Hijiki), Laminaria sp (Kombu). e Undaria pinnatifida (Wakame) e em 3 derivados de algas (agar, carragenana e alginato de sódio). Foi possível verificar que as algas são excelentes fontes de elementos essenciais como Ca, Cr, Fe e Zn. O grupo de algas marrons (Hijiki, Kombu e Wakame) apresentaram altas concentrações de As, principalmente a espécie Hijikia Fulsiforme, o que chama a atenção uma vez que arsênio é um elemento toxico e o consumo do mesmo pode acarretar problemas graves à saúde. Os derivados apresentaram concentrações menores para a maioria dos elementos exceto para Ca.
  • Artigo IPEN-doc 28676
    The use of total diet study for determination of natural radionuclides in foods of a high background radiation area
    2022 - ROSA, MYCHELLE M.L.; MAIHARA, VERA A.; TADDEI, MARIA H.T.; CHEBERLE, LUAN T.V.; AVEGLIANO, ROSEANE P.; SILVA, PAULO S.C.
    The activity concentrations of 40K, 210Pb, 210Po, 226Ra, 228Ra, 228Th, 230Th, 232Th, 234U, and 238U were determined in 82 food samples, grouped into 20 food groups according to the Brazilian Total Diet, which reflects the dietary habits of a population, for the rural and urban areas of Poços de Caldas city, a High Background Radiation Area. The highest activity concentration found in the food samples was due to 40K being present in all types of food. Among the other radionuclides, high activity concentrations were found for 210Pb in beans and salt, 210Po in fish, 226Ra and 228Ra in nuts and seeds. The main food groups that contributed most to the effective dose, in urban and rural regions, were beans and beverages. The effective doses, due to the ingestion of the analysed food groups, were of 0.44 and 0.60 mSv y−1 and the lifetime cancer risks were 1.6 × 10−3 and 2.3 × 10−3 for the urban and rural Poços de Caldas population, respectively.
  • Resumo IPEN-doc 27952
    Naturally occurring radionuclides in a fish reference material
    2019 - MOREIRA, EDSON G.; SILVA, PAULO S.C.; MAIHARA, VERA A.; TAPPIZ, BRUNO; NISTI, MARCELO B.; SAUEIA, CATIA H.R.; CARVALHO, RICARDO N.
  • Artigo IPEN-doc 27873
    Iodine determination in edible algae species using epithermal neutron activation analysis methodology
    2021 - ALBUQUERQUE, C.R.; MAIHARA, V.A.; SILVA, P.S.C.
    Iodine is one of the essential trace elements of much interest in nutritional research being responsible for the production of the thyroid hormones, which has great importance for human metabolism. Edible algae species accumulate iodine from seawater and are considered a good dietary source of this nutrient. The Epithermal Neutron Activation Analysis (ENAA) was applied to determine the iodine concentration in edible algae species and derivatives. Twenty-one samples for 4 edible algae species Porphyra umbilicalis (common name: Nori), Hijikia fusiforme (Hijiki), Undaria pinnatifida (Wakame) and Laminaria spp. (Kombu) and 3 samples of the derivative sample, ágar, were analyzed. The results pointed out a great variability of I concentration in these species. The highest I concentration obtained was 9324±113 mg/kg in Laminaria spp. (Kombu). Hijikia fulsiforme (Hijiki) also presented high values (1803±86 mg/kg). The lowest I content was obtained in agar samples (3.18±0.29 mg/kg). All analyzed algae samples exceed the recommended value (150 μg/day) and an ingestion of 1 g/day of Laminaria spp. (Kombu) exceed the maximum tolerable limit (1100 μg/day) and its consumption must be controlled to avoid possible health problems.
  • Artigo IPEN-doc 27858
    A study on tree bark samples for atmospheric pollution monitoring
    2021 - SANTOS, E.C.; MAIHARA, V.A.; GENEZINI, F.A.; SAIKI, M.
    Tree barks are considered a promising indicator of air pollution monitoring, because of its accumulation of aerosol particles, simplicity of species identification and wide geographical distribution. However, there are no established protocols for its sampling as well as there are no detailed studies on its usability as an alternative or complementary indicator of atmospheric pollution. In this study, barks from very common tree species, Sibipiruna (Poincianella pluviosa) and Tipuana (Tipuana tipu), were analyzed to define experimental conditions for their use as biomonitor of air pollution. Bark samples collected at the São Paulo city were cleaned and ground for analysis. Instrumental neutron activation analysis (INAA) was applied for the determination of As, Br, Ca, Co, Cr, Fe, K, Sb, Sc and Zn and graphite furnace atomic absorption spectrometry (GF AAS) for Cd and Pb. Results obtained in these analyses indicated that species of trees, bark surface layers taken for analysis as well as tree trunk diameter or tree age should be considered for use tree bark as a biomonitor. Analytical control of results carried out by analyzing certified reference materials demonstrated that INAA and GF AAS techniques can provide reliable data for element concentrations with standardized differences, |Enscore | < 1.
  • Livro IPEN-doc 26714
    O IPEN e a saúde
    2019 - LINARDI, MARCELO; NETTO, ANA P.F.A.; LUGAO, ADEMAR B.; FREITAS, ANDERSON Z. de; CARBONARI, ARTUR W.; ZEITUNI, CARLOS A.; SOARES, CARLOS R.J.; SILVA, CECILIA C.G. e; ZAMBONI, CIBELE B.; PERONI, CIBELE N.; VIEIRA, DANIEL P.; ANDRADE, DELVONEI A. de; ZEZELL, DENISE M.; LAZAR, DOLORES R.R.; PARRA, DUCLERC F.; MOREIRA, EDSON G.; LANDULFO, EDUARDO; FONSECA, EDVALDO R.P. da; PERINI, EFRAIN A.; ARAUJO, ELAINE B. de; MUCCILLO, ELIANA N. dos S.; CARVALHO, ELITA F.U. de; BERNARDES, EMERSON S.; MOURA, ESPERIDIANA A.B. de; SILVA, FABIANA M. da; MOREIRA, FERNANDO J.F.; SILVA, FLAVIA R. de O.; GENEZINI, FREDERICO A.; ALVES, GLAUCIE J.; YORIYAZ, HELIO; COSTA, ISOLDA; MENGATTI, JAIR; ROSSI, JESUALDO L.; OLIVEIRA, JOAO E. de; SARKIS, JORGE E. de S.; PERROTTA, JOSE A.; ROGERO, JOSE R.; SHORTO, JULIAN M.B.; SILVA, LEONARDO G. de A. e; MOLNARY, LESLIE de; RODRIGUES, LETICIA L.C.; DIAS, LIGIA E.M.F.; CALDAS, LINDA V.E.; POZZO, LORENA; GENOVA, LUIS A.; MATSUDA, MARGARETH M.N.; HAMADA, MARGARIDA M.; FELINTO, MARIA C.F. da C.; POTIENS, MARIA da P.A.; ROSTELATO, MARIA E.C.M.; MARUMO, MARIA H.B.; VASCONCELLOS, MARINA B.A.; RIBEIRO, MARTHA S.; COTRIM, MARYCEL E.B.; NEVES, MAURICIO D.M. das; MORALLES, MAURICIO; DIAS, MAURO da S.; IGAMI, MERY P.Z.; DURAZZO, MICHELANGELO; SUZUKI, MIRIAM F.; SAIKI, MITIKO; MATHOR, MONICA B.; VIEIRA JUNIOR, NILSON D.; BARTOLINI, PAOLO; SPENCER, PATRICK J.; SILVA, PAULO S.C. da; AFFONSO, REGINA; CARNEIRO, REGINA C.G.; ROGERO, SIZUE O.; SAKATA, SOLANGE K.; CASTANHO, SONIA R.H. de M.; MAIHARA, VERA A.; ROSSI, WAGNER de; CALVO, WILSON A.P.; KODAMA, YASKO
  • Artigo IPEN-doc 26256
    Iodine determination in edible algae species using ENAA methodology
    2019 - ALBUQUERQUE, CAROLINE R.; MAIHARA, VERA A.; SILVA, PAULO S.C. da
    Iodine is one of the essential trace elements of much interest in nutritional research being responsible for the production of the thyroid hormones, which has great importance for human metabolism. Edible algae species accumulate iodine from seawater and are considered a good dietary source of this nutrient. The Epithermal Neutron Activation Analysis (ENAA) was applied to determine the iodine concentration in edible algae species and derivatives. Twenty-one sample for 4 edible algae species Porphyra umbilicalis (common name: Nori), Hijikia fusiforme (Hijiki), Undaria pinnatifida (Wakame) and Laminaria spp. (Kombu) and 3 samples of the derivative sample, ágar, were analyzed. The results pointed out a great variability of I concentration in these species. The highest I concentration obtained was 9324±113 mg/kg in Laminaria spp. (Kombu). Hijikia fulsiforme (Hijiki) also presented high values (1803±86 mg/kg). The lowest I content was obtained in agar samples (3.18±0.29 mg/kg).
  • Artigo IPEN-doc 26184
    A study on tree bark samples for atmospheric pollution monitoring
    2019 - SANTOS, ELIANE C. dos; MAIHARA, VERA A.; GENEZINI, FREDERICO A.; SAIKI, MITIKO
    Tree barks are considered a promising indicator of air pollution monitoring, because of its accumulation of aerosol particles, simplicity of species identification and wide geographical distribution. However, there are no established protocols for its sampling as well as there are no detailed studies on its usability as an alternative or complementary indicator of atmospheric pollution. In this study, barks from very common tree species, Sibipiruna (Poincianella pluviosa) and Tipuana (Tipuana tipu), were analyzed to define experimental conditions for their use as biomonitor of air pollution. Bark samples collected at the São Paulo city were cleaned and ground for analysis. Instrumental neutron activation analysis (INAA) was applied for the determination of As, Br, Ca, Co, Cr, Fe, K, Sb, Sc and Zn and graphite furnace atomic absorption spectrometry (GF AAS) for Cd and Pb. Results obtained in these analyses indicated that species of trees, bark surface layers taken for analysis as well as tree trunk diameter or tree age should be considered for use tree bark as a biomonitor. Analytical control of results carried out by analyzing certified reference materials demonstrated that INAA and GF AAS techniques can provide reliable data for element concentrations with standardized differences, |Enscore | < 1.