Neutron activation analysis of phytotherapics of Maytenus ilicifolia and Solanum melongena plants
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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
In Brazil, the consumption of phytotherapics has become very popular due to the
vast biodiversity of the immense flora, to the belief that plants that are of natural
origin are safe and without side effects. Besides phytotherapics, in general, are
cheaper than synthetic products. The objective of this study is to evaluate the elemental
concentrations in phytotherapics of the plants Maytenus ilicifolia, also known
as Holly or "Espinheira Santa", and Solanum melongena, known as Eggplant. The analysis of the elemental composition of phitotherapics is of great importance since
these products may contain toxic or essential elements above of the safe limits for
human consumption. The determinations also may be used to study the correlation
the presence of some elements with their therapeutic effects. The phytotherapics
samples were acquired in drug stores in São Paulo city and they were in powder form
placed in capsules. Their elemental concentrations were determined by Neutron Activation
Analysis (NAA) method. Aliquots of the samples and synthetic elemental
standards were irradiated at the IEA-R1 nuclear reactor with thermal neutron flux of
about 4.24 1012 n cm2 s1 during 16h. After adequate decay times, the irradiated
samples and standards were measured using a HGe detector coupled to a gamma ray
spectrometer. The radionuclides were identified by the gamma rays energies and the
half- lives. Concentrations of the elements were calculated by comparative method.
For quality control of the results, the certified reference material INCT-MPH-2 Mixed
Polish Herbs was analyzed. Elements Br, Ca, Cr, Cs, Co, Fe, K, La, Rb, Sb, Sc,
Se and Zn were determined in this study. Results obtained in the certified reference
material showed a good agreement with the certified values. The variation (Relative
Standard Deviation) of the contents of each capsule was of 6.1% for "Espinheira
Santa" sample, and of 5.6% for Eggplant. This result indicates that the sample of
"Espinheira Santa" phytotherapic presented more homogeneous in terms of mass
of the contents in each capsule than that of Eggplant. In the phytotherapics, the
elements Ca and K were found at the percentage levels, the elements Br, Fe, Rb
and Zn at the g/g and the Co, Cr, Cs, La, Sb and Sc at the ng/g level. In the
Eggplant phytotherapic, the element As was found but at very low concentration of
ng/g.
Como referenciar
PEREIRA, L.M.; SAIKI, M. Neutron activation analysis of phytotherapics of Maytenus ilicifolia and Solanum melongena plants. 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. 35-36. Disponível em: http://repositorio.ipen.br/handle/123456789/28732. 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.