A rapid and novel alternative to conventional sample treatment for arsenic speciation in rice using enzymatic ultrasonic probe

Sanz, E.; Muñoz-Olivas, Riánsares; Cámara, Carmen

doi:10.1016/j.aca.2004.12.021

Cited by 99 publications

(63 citation statements)

References 29 publications

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“…This result also confirms that spinach is a bio-accumulative plant for the more toxic As species. However, Sanz et al (2005) Larsen 1998) have also reported the presence of inorganic As (As III and As V ) as the predominant form of As in plant tissue. The sum concentration of the species matched the total digested concentration, which indicated that all of the As forms could be analyzed and detected by anion exchange IC-ICP-MS.…”

Section: Speciation Of As In Spinachmentioning

confidence: 93%

“…We found that a microwave-assisted technique with protein extracting solution was most effective, yielding 76-114% Introduction managing contamination. Human intake of As mainly occurs via the food chain (dietary sources and drinking water) and occupational exposure (Naidu 1999;Sanz et al 2005). To investigate total As loading in people exposed to As, there has been much emphasis on the total As content of the water and plant tissue that constitutes their diet.…”

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confidence: 99%

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A comparative study of the extractability of arsenic species from silverbeet and amaranth vegetables

Rahman

Chen

Naidu

2009

Environ Geochem Health

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There is still no reliable standard extraction method for the speciation of arsenic (As) in plant tissue, and hence there is great interest in developing one for plants that are used as human food. Speciation and bioavailability are critical for accurate human health risk assessment, as As species vary in both their toxicity and bioavailability. Recent incidences of As poisoning in many countries have led to significant research into the fate and dynamics of As in the soil and water environment, including speciation. Although one of the major pathways of ingestion of As is via food, only limited research has been conducted to assess the nature and proportion of various As species present in food crops. In this study, we compared the efficacy of ammonium dihydrogen phosphate and protein extracting solution for the extractability of As from two different species of spinach (amaranth and silverbeet). We found that a microwave-assisted technique with protein extracting solution was most effective, yielding 76-114% extractability and excellent separation and speciation of all As species present in the spinach matrices. The stability test for extracted As species showed them as stable for 45 days without any significant loss or inter-conversion. Both As III and As V were identified in the shoots of amaranth and silverbeet. However, the percentage of As species varied between amaranth and silverbeet. The silverbeet shoot showed a somewhat higher percentage of As V , while the amaranth showed a higher percentage of As III . The samples contained mostly inorganic As, especially As III ([90%) in the edible part of the vegetables, a form that is more toxic and bioavailable than other organic and methylated species.

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Section: Speciation Of As In Spinachmentioning

confidence: 93%

mentioning

confidence: 99%

A comparative study of the extractability of arsenic species from silverbeet and amaranth vegetables

Rahman

Chen

Naidu

2009

Environ Geochem Health

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“…The method has been used for rice flour, fish and shellfish, and biological samples that contain a range of arsenic species. [22][23][24][25][26][27][28][29][30][31][32][33][34] However, the peaks for As(III) and MMAA are very close together, as are those for DMAA and AsB, and TMAO and TeMA. If many analyses are carried out on one column, some degradation of the packing might occur and these pairs of peaks would possibly not be separated.…”

Section: Introductionmentioning

confidence: 91%

Reversed Phase Column HPLC-ICP-MS Conditions for Arsenic Speciation Analysis of Rice Flour

Narukawa¹,

Matsumoto

Nishimura

et al. 2015

ANAL. SCI.

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New measurement conditions for arsenic speciation analysis of rice flour were developed using HPLC-ICP-MS equipped with a reversed phase ODS column. Eight arsenic species, namely, arsenite [As(III)], arsenate [As(V)], monomethylarsonic acid (MMAA), dimethylarsinic acid (DMAA), trimethylarsine oxide (TMAO), tetramethylarsonium (TeMA), arsenobetaine (AsB) and arsenocholine (AsC), were separated and determined under the proposed conditions. In particular, As(III) and MMAA and DMAA and AsB were completely separated using a newly proposed eluent containing ammonium dihydrogen phosphate. Importantly, the sensitivity changes, in particular those of As(V) and As(III) caused by coexisting elements and by complex matrix composition, which had been problematical in previously reported methods, were eliminated. The new eluent can be applied to C8, C18 and C30 ODS columns with the same effectiveness and with excellent repeatability. The proposed analytical method was successfully applied to extracts of rice flour certified reference materials.

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“…Although quantitative extraction of As from some foods has been achieved with these solvents, it has been di$cult to achieve thorough extraction from rice samples. Attempts to utilize an accelerated solvent extraction technique 1,10,16,17) or enzymatic ultrasonic probe 18) have been reported for rice, but As extraction from rice samples remains di$cult 6), 19) . In our preceding report, the nitric acid-based partialdigestion method was assessed as a mean of achieving complete As extraction from hijiki samples 20) .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a Nitric Acid-based Partial-digestion Method for Selective Determination of Inorganic Arsenic in Rice

Hamano-Nagaoka¹,

Nishimura²,

Matsuda³

et al. 2008

J. Food Hyg. Soc. Jpn

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Arsenic (As) uptake in human occurs via the food chain mainly. The Joint FAO/WHO Expert Committee on Food Additives has established the provisional tolerable weekly intake level for As as an inorganic As (iAs) value, because iAs in food is much more toxic than organic As. In this study, we studied an acid based partial-digestion method for the complete extraction of arsenicals from rice. HPLC/ICP-MS was used to determine the concentration of iAs selectively. The conditions adopted to extract arsenicals from a 0.5 g of finely ground rice sample were addition of 2 mL of 0.15 mol/L nitric acid and heating at 80ῌ for 2 hr. The LOD and LOQ for iAs were 0.0024 and 0.0079 mg/kg dry weight, respectively. Recovery studies showed good accuracy. When the method was applied to ten short-grain brown rice samples, the iAs concentrations were 0.108ῌ 0.227 mg/kg dry weight and the total As concentrations were 0.118ῌ0.260 mg/kg dry weight. Although dimethylarsinic acid was also detected in most samples, the percentage of iAs content in total As content was 62.2ῌ96.3῍. Thus, iAs was the principal As species in the short-grain brown rice samples tested.

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A rapid and novel alternative to conventional sample treatment for arsenic speciation in rice using enzymatic ultrasonic probe

Cited by 99 publications

References 29 publications

A comparative study of the extractability of arsenic species from silverbeet and amaranth vegetables

A comparative study of the extractability of arsenic species from silverbeet and amaranth vegetables

Reversed Phase Column HPLC-ICP-MS Conditions for Arsenic Speciation Analysis of Rice Flour

Evaluation of a Nitric Acid-based Partial-digestion Method for Selective Determination of Inorganic Arsenic in Rice

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