New way of cooking rice removing Arsenic and retaining nutrients found
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New way of cooking rice removing Arsenic and retaining nutrients found

Science

TBS Report
06 November, 2020, 09:05 am
Last modified: 06 November, 2020, 12:21 pm

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New way of cooking rice removing Arsenic and retaining nutrients found

Rice is known to accumulate around ten times as much arsenic as other cereals

TBS Report
06 November, 2020, 09:05 am
Last modified: 06 November, 2020, 12:21 pm
Photo : SciTechDaily
Photo : SciTechDaily

A new method of cooking has been found having 50 percent of the naturally occurring arsenic in brown rice, and 74 percent in white rice, says a new study.

Published on October 29, 2020, in Science of the Total Environment – the article shows that the new way does not reduce micronutrients in the rice, reports SciTechDaily.

Following previous research from the University of Sheffield that found half of the rice consumed in the UK exceeded European Commission regulations for levels of arsenic in rice meant for the consumption for infants or young children.

This new study tested different ways to cook rice to try and reduce the arsenic content and the team from the Institute for Sustainable Food found that by using a home-friendly way of cooking rice, the 'parboiling with absorption method' (PBA), most of the arsenic was removed, while keeping most nutrients in the cooked rice.

The PBA method involves parboiling the rice in pre-boiled water for five minutes before draining and refreshing the water, then cooking it on a lower heat to absorb all the water.

Arsenic, which is classified as a Group 1 carcinogen by the International Agency for Research on Cancer, is water-soluble – so it accumulates in rice, which is grown in flooded fields more than other cereals. Arsenic exposure affects almost every organ in the body and can cause skin lesions, cancer, diabetes, and lung diseases.

Rice is known to accumulate around ten times as much arsenic as other cereals. In rice grains arsenic is concentrated in the outer bran layer surrounding the endosperm. This means that brown rice, (unmilled or unpolished rice that retains its bran) contains more arsenic than white rice. This milling process removes arsenic from white rice but also removes 75-90% of its nutrients.

Photo: SciTechDaily.
Photo: SciTechDaily.

"For rice consumers, this is excellent news. There are genuine concerns amongst the population about eating rice due to arsenic. Previous studies have shown that cooking rice in excess water could remove arsenic but the problem is it also removes nutrients.

Our aim was to optimise the method to remove arsenic while keeping maximum nutrients in the cooked rice. Our newly developed method, PBA, is easy and home-friendly so that everyone can use it. We don't know the amount of arsenic in each packet rice we buy; even though brown rice is nutritionally superior to white rice as our data shows, it contains more arsenic than white rice. With our new method we are able to significantly reduce the arsenic exposure while reducing the loss of key nutrients.

We highly recommend this method while preparing rice for infants and children as they are highly vulnerable to arsenic exposure risks."

— Dr. Manoj Menon

Environmental Soil Scientist in the Department of Geography at the University of Sheffield and lead author of the study

Reference: "Improved rice cooking approach to maximise arsenic removal while preserving nutrient elements" by Manoj Menon, Wanrong Dong, Xumin Chen, Joseph Hufton andEdward J. Rhodes, 29 October 2020, Science of The Total Environment.
DOI: 10.1016/j.scitotenv.2020.143341

The research was funded as part of the UK's Science and Technology Facilities Council (STFC) Food Network+ along with partial financial support from School of Health and Related Research (ScHARR) at the University of Sheffield. The network brings together more than 750 international and multidisciplinary researchers from across the agri-food sector to work with experts from STFC's research facilities, all with the aim of solving some of the world's greatest food sustainability challenges. Until April this year, the network was led by the University of Manchester. This is now being led by academics at the Institute for Sustainable Food.

The Institute for Sustainable Food at the University of Sheffield brings together multidisciplinary expertise and world-class research facilities to help achieve food security and protect the natural resources we all depend on.

Top News / World+Biz

rice / Arsenic / nutrients

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