Investigation of elemental composition in commercial dietary supplements by neutron activation analysis
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2017
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60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS
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Resumo
Dietary supplement consumption has grown to complement deficiency of essential
nutrient intake, to improve physical activity performance in athletes, to prevent
diseases and to delay the effects of age. The aim of this study was to evaluate the
elemental composition in multivitamin and protein supplements for its quality control
and to assess the risks to human health. This study evaluated elemental composition
of multivitamin and protein dietary supplements, acquired in São Paulo city. Elements
As, Br, Ca, Co, Cr, Cs, Fe, K, La, Na, Rb, Sb, Sc, Se and Zn were determined in
these dietary supplements, using neutron activation analysis (NAA). Aliquots of the
supplements weighted in polyethylene envelopes were irradiated with elemental standards
at the IEA-R1 nuclear research reactor from 1 to 8h with thermal neutron flux
of 4:0 1012 n cm2s1 . After adequate decay times the induced gamma activities
of the samples and standards were measured using a HPGe detector coupled to a
Digital Spectrum Analyzer DSA 1000. The elements were identified in the gamma
spectra by gamma ray energies and half-lives and the concentrations were calculated
by comparative method. The certified reference material NIST 1632d Coal
Bituminous were analyzed for quality control. The results presented good precision
and accuracy with jZscorej 2. Mass of elements found in multivitamins agreed
with label values but in proteins, several elements did not comply with the National
Health Surveillance Agency (ANVISA) regulations. Element amount per dose of the
dietary supplement indicated that Cr and Se exceeded the recommended daily intake
percentile values. The daily element intakes by consumption of supplements did not
exceed the Tolerable Upper Intake Limits (UL) for the supplements analyzed. Toxic
elements (Cd, Hg and Sb) were not detected in the supplements and As was detected
at very low mass fractions.
Como referenciar
SOUZA, V.I.; SAIKI, M. Investigation of elemental composition in commercial dietary supplements by neutron activation analysis. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 51-51. Disponível em: http://repositorio.ipen.br/handle/123456789/28749. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.