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Descripción
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| It is known that seaweeds constitute a food product rich in fiber, minerals, proteins, vitamins and other specific nutrients as polyunsaturated fatty acids. Interest in them has increased in Western countries in recent years because of their nutritive value, although macroalgae have been traditionally consumed in Asia. As algal elements display great bioavailability, seaweeds may represent important alternative dietary sources of macro, trace and ultratrace elements [1]. Research in this field is of great scientific importance because algae are able to bioaccumulate essential elements, such as Cr, Cu, Ni and Zn, at higher rates than land vegetation. However, as a result of environmental pollution, algae can also concentrate not essential elements, such as As, Pb and Cd. Therefore, more information on marine algae would benefit future nutritional studies. Total arsenic and heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) concentrations in marine alga samples from China, France, Japan and Spain were determined by ICP-AES, after mineralization in a microwave oven at 200 ºC for 10 minutes. Three acid digestion mixtures (nitric acid, hydrochloric acid/nitric acid (3:1, V/V) and nitric acid/hydrogen peroxide (1:1, V/V)) were tested on the CRMs NIES No. 9 Sargassum fulvellum and NMIJ CRM 7405-a Hijiki. The results obtained with the digestion mixture of HNO3/H2O2 (1:1, V/V) showed the absence of significant differences, at the 95% confidence level, between the concentrations found and the certified values. Therefore, the analytical method used has proven to be suitable for the determination of total contents of As and heavy metals in alga samples. In general, As was the major element between those analyzed in the alga samples studied, followed by Zn. Arsenic concentrations varied within a wide range (22-126 µg g-1), with higher percentages of inorganic species in brown algae [2], whereas Zn levels were between 3.7 and 57 µg g-1. Cadmium concentrations ranged between 0.10 and 2.9 µg g-1, and Cr levels were generally lower than 1.7 µg g-1. In the case of Cu, Ni and Pb, the highest concentration levels found were 14, 11.4 and 1.5 µg g-1, respectively. Taking into account the consumption of brown algae for Japanese population (a daily average of 2-3 g dw and a maximum of 12 g dw) [3], the mean intake of essential elements recommended by WHO for adult population and the tolerable daily intake of inorganic As, Cd and Pb stablished by FAO and the Joint Expert Committee on Food Additives (JECFA), the alga species studied cannot be considered a health risk regarding the elements analyzed, except for arsenic contents, especially when inorganic species are present. | |
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Internacional
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Si |
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Nombre congreso
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EUROFOODCHEM XVIII |
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Tipo de participación
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960 |
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Lugar del congreso
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Madrid |
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Revisores
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Si |
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ISBN o ISSN
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0000-0000 |
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DOI
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Fecha inicio congreso
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13/10/2015 |
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Fecha fin congreso
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16/10/2015 |
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Desde la página
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363 |
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Hasta la página
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363 |
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Título de las actas
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EUROFOODCHEM XVIII. UPCOMING CHALLENGES IN FOOD SCIENCE |