Nut Roasting Benefits: Antioxidant levels of nuts increases after roasting

Dec 22, 2009 By Devin Powell, ISNS

The chemical reaction that darkens a batch of roasting peanuts also boosts the amount of antioxidants they contain, according to a new study in the journal Food Chemistry.

Many varieties of nuts have long been known to be a good source of and other nutrients -- especially peanuts, walnuts, pecans, and holiday chestnuts.

Jack Davis of the Department of Agriculture roasted batches of peanuts at 300 degrees Fahrenheit for up to 77 minutes. During roasting, the nuts darkened as the Maillard reaction -- the same process that browns cooked meat -- caused proteins and sugars to react and form a variety of new compounds.

The darker the color, Davis found, the more antioxidants. Roasting for ten peanuts increased levels of antioxidants by 22 percent. The skins of the peanuts contained the high levels of antioxidants -- twice as much as the peanuts themselves.

"As skins are primarily a by-product of peanut processing, this data suggests that this low value material could readily function as a natural antioxidant in foods," said Davis.

Davis suspects that this result may apply to other kinds of nuts -- but did not comment about whether he plans to roast any chestnuts this holiday season.

Explore further: Explainer: What are chemical weapons?

More information: pubs.acs.org/journal/jafcau

not rated yet
add to favorites email to friend print save as pdf

Related Stories

Roasting Does More than Enhance Flavor in Peanuts

Dec 09, 2009

(PhysOrg.com) -- Agricultural Research Service (ARS) scientists have shown that increasing roast color intensity steadily ramps up the antioxidant capacities of peanuts, peanut flour and peanut skins.

Boiled peanuts pack big antioxidant punch

Oct 26, 2007

Boiled peanuts, a regional treat from the southern United States, may be as healthy as they are delicious. In the Oct. 31 issue of ACS' Journal of Agricultural and Food Chemistry, Alabama scientists report ...

Salmonella: Tough to crack when it’s in peanuts

Feb 11, 2009

(PhysOrg.com) -- For the second time in two years, a nationwide outbreak of salmonellosis has been tied to peanut products. This time, over 570 people have been sickened and over 1700 products have been taken off supermarket ...

Peanut allergies overstated, study finds

May 16, 2007

Despite hundreds of families being told their children have peanut allergies every year, many of the children may be able to eat peanuts safely, a study by researchers at the University of New South Wales (UNSW) and Sydney ...

Allergy-free protein shows hope for a risk-free peanut

Dec 05, 2006

For nearly 3 million Americans, the most dangerous aspect to air travel is the complimentary in-flight snack. Every year, about 150 people are killed by a common ingredient of a first-grader’s brown bag lunch.

Torrefacto-roasted coffee has higher antioxidant properties

Mar 06, 2008

Torrefacto-roasted coffee has higher antioxidant properties than natural roast, according to the dissertation defended by a biologist of the University of Navarra, Isabel López Galilea. She has emphasized in her study that ...

Recommended for you

Explainer: What are chemical weapons?

May 24, 2013

There was chaos on the streets of Halajba in March 1988. In this corner of Iraq, at the time Iraqi Kurdistan, people had suddenly started experiencing cold-like symptoms – tight chest and nasal congestion. ...

Scientists develop advanced biological computer

May 24, 2013

(Phys.org) —Using only biomolecules (such as DNA and enzymes), scientists at the Technion-Israel Institute of Technology have developed and constructed an advanced biological transducer, a computing machine capable of manipulating ...

Research aims to fix long-held, inaccurate insect model

May 24, 2013

(Phys.org) —In humans, a polymer called melanin determines skin, eye and hair color—the darker the skin, the more melanin in a person's body. For insects, melanin is a major aspect of their immune defense ...

Molecular modelling to help create better, safer drugs

May 24, 2013

(Phys.org) —How our bodies break down the common drugs ibuprofen, diclofenac and warfarin is the subject of a new study from the University of Bristol, published in the Journal of the American Chemical So ...

User comments : 0

More news stories

New method for producing clean hydrogen

Duke University engineers have developed a novel method for producing clean hydrogen, which could prove essential to weaning society off of fossil fuels and their environmental implications.

Scientists develop advanced biological computer

(Phys.org) —Using only biomolecules (such as DNA and enzymes), scientists at the Technion-Israel Institute of Technology have developed and constructed an advanced biological transducer, a computing machine capable of manipulating ...

New rhythm for El Nino discovered

El Niño wreaks havoc across the globe, shifting weather patterns that spawn droughts in some regions and floods in others. The impacts of this tropical Pacific climate phenomenon are well known and documented.

Moon may harbour alien minerals, study says

Minerals found in craters on the Moon may be remnants of asteroids that slammed into it and not, as long believed, the satellite's innards exposed by such impacts, a study said Sunday.

Conductive paint lands in pens and pots for creatives

London-based Bare Conductive Ltd. makes electrically conductive paint called Bare Paint. The substance allows the painting of "liquid wiring" on any surface. Except for skin, you can apply its paint on walls ...

Scientists discover the origin of a giant synapse

Humans and most mammals can determine the spatial origin of sounds with remarkable acuity. We use this ability all the time—crossing the street; locating an invisible ringing cell phone in a cluttered bedroom. ...