Rice Science

Rice Science

Volume 28, Issue 4, July 2021, Pages 402-408
Rice Science

Research Paper
Effect of Milling and Parboiling Processes on Arsenic Species Distribution in Rice Grains,☆☆

https://doi.org/10.1016/j.rsci.2021.05.010Get rights and content
Under a Creative Commons license
open access

Abstract

This study identified the role of milling and parboiling on arsenic (As) content and its species in large numbers of rice samples. Total As contents were 108 ± 33 μg/kg in polished rice grains (PR), 159 ± 46 μg/kg in unpolished rice grains (UR), 145 ± 42 μg/kg in parboiled polished rice grains (PPR) and 145 ± 44 μg/kg in parboiled unpolished rice grains (PUR). The percentages of inorganic As (iAs) were 66% ± 8% in PR and from 72% to 77% in other grain categories. The polishing process reduced the As content in the rice grains, removing outer part of the UR with high amount of As, whereas the parboiling technique transferred the semimetal content within the grain. Total As and iAs contents were not significantly different in UR, PPR and PUR, homogenizing its distribution inside the grains. The results allowed to understand how different operations affect As fate and its chemical forms in grains.

Keywords

rice
arsenic
inductively coupled plasma-mass spectrometer
milling
parboiling
laser ablation

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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

☆☆

Peer review under responsibility of China National Rice Research Institute.