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Coffee residue a valuable resource, not waste
Saturday January 12, 2013 08:54:18 PM,
IANS
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Bangalore: Used coffee
grounds - the muck left behind in your percolator after brewing
coffee - are a valuable source of bioactive compounds for
producing dietary supplements, scientists report.
Millions of coffee cups are consumed every day around the world,
generating about 20 million tonnes of used grounds annually in
restaurants and cafeterias and also at domestic levels, says the
report. Traditionally these residues have been considered as
wastes and thrown away, or occasionally used as garden fertilizer.
The new report in the American Chemical Society's Journal of
Agricultural and Food Chemistry by Maria-Paz de Pena and
colleagues at the University of Navarra at Pamplona in Spain
concludes that used coffee grounds are a rich source of healthful
antioxidant substances sought after by both the food and
pharmaceutical industry.
The scientists determined the amount of these useful bioactive
compounds in spent coffee obtained from the preparation of coffee
brews with filter, plunger and espresso-type coffeemakers common
in homes and commercial kitchens. The compounds were analyzed by
"high-performance liquid chromatography".
They found that the main bioactive compounds - caffeoylquinic
acids, caffeine and browned compounds, including melanoidins - in
the spent coffee grounds were actually four-to-seven-fold higher
than in the coffee brew itself.
According to their report, the residues generated during the
coffee brewing procedure can, therefore, be considered a new
source of natural antioxidants and bioactive compounds.
These compounds, the scientists said, are in increasing demand by
the food industry that is looking for substitutes to artificial
additives, and also the pharmaceutical industry for making dietary
supplements with high nutritional value or to develop new healthy
products.
The report said the bioactive compounds can be easily extracted
with water and, after extraction, the final residue could still be
used in agriculture as fertiliser because it is practically
caffeine-free.
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