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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Availability of arsenic in rice grains by in vitro and in vivo (humans) assays

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Pedron, Tatiana [1] ; Freire, Bruna Moreira [1] ; Castro, Carlos Eduardo [1] ; Ribal, Luiz Felipe [2] ; Batista, Bruno Lemos [1]
Total Authors: 5
[1] Fed Univ ABC, Ctr Nat & Human Sci, BR-09210580 Santo Andre, SP - Brazil
[2] Fed Univ ABC, Ctr Engn Modeling & Appl Social Sci, BR-09210580 Santo Andre, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 0

Background: Rice grains are consumed by approximately half of the world's population. This cereal has higher arsenic (As) concentrations in grains than wheat or barley. Arsenic determination in food and/or in vitro studies are important for risk assessment; however, it is not enough to assess the real human exposure. Method: In vitro bioaccessibility was carried out in husked-rice using gastric and intestinal solutions similar to humans. Also, As naturally found in husked-rice was evaluated by in vivo bioavailability in humans. For this purpose, diets from the 1st and 2nd days were free of foods known to be high in As; 3rd and 4th days the diets were composed by rice and water and; 5th and 6th the diet was similar the 1st and 2nd days. During all experimentation, a representative aliquot of each meal, blood and urine were collected for total As (t-As) determination. Arsenic species were determined in the urine. Results: t-As in husked rice varied from 157.3 +/- 30.6 to 240.2 +/- 85.2 mu g kg(-1). The in vitrobioaccessible fractions ranged from 91 to 94%. Inorganic As (i-As) ranged from 99.7 +/- 11.2 to 159.5 +/- 29.4 mu g kg(-1). For the in vivo assay, t-As concentrations in the woman and man blood were about 3 mu g mL(-1) from the 1st to 6th day. Arsenic from the rice ingested was excreted by urine about 72 h after ingestion. The t-As and dimethyl As (DMA) in urine ranged from 3.59 to 47.17 and 1.02 to 2.55 mu g g(-1) creatinine for the volunteers, indicating a two-fold DMA-increase in urine after ingestion of husked-rice. Conclusion: After rice ingestion, As was quickly metabolized. The higher As concentrations were found in urine 72 h after rice ingestion. The main As-specie found in urine was DMA, indicating that methylation of As from rice followed by urine excretion is the main biological pathway for As excretion. (AU)

FAPESP's process: 17/20914-8 - Method validation for determination of trace elements in urine for occupational evaluation of foundry workers
Grantee:Bruna Moreira Freire
Support type: Scholarships in Brazil - Master
FAPESP's process: 16/10060-9 - Multi-user equipment (MUE) approved in Grant FAPESP project 2014/05151-0: inductively coupled plasma mass spectrometer hyphenated to an high performance liquid chromatography (HPLC-ICP-MS)
Grantee:Bruno Lemos Batista
Support type: Multi-user Equipment Program
FAPESP's process: 14/05151-0 - Arsenic and rice: monitoring and (bio)remediation studies for food safety
Grantee:Bruno Lemos Batista
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 16/19924-6 - In vitro bioaccessibility assessment and in vivo bioavailability of arsenic ingested through rice commonly consumed by Brazilians
Grantee:Tatiana Pedron
Support type: Scholarships in Brazil - Doctorate