Abstract
Consumption of food rich in polyphenols such as fruits and vegetables is of great importance, because it contributes to the prevention of various diseases.Polyphenols are a group of bioactive compounds which can play significant role in preventing various health related problems.One of the richest sources of polyphenols in the human diet is the onion (Allium cepa L.).The main objective of the present investigation is quantification of total polyphenolic content (TPC) in the Macedonian local population of onion.A various organic solvents were tested (methanol, ethanol, ethyl acetate and acetone) and their different concentrations (20, 40, 60 and 80%) in order to establish optimum solvent concentration for extraction of polyphenols from onion.Time for extraction was another important parameter which was examined as well.TPC was determined by UV-Vis spectroscopy in accordance with the Folin-Ciocâlteu assay, using gallic acid as a reference standard.The results were expressed as mg gallic acid equivalents GAE/100 g fresh onion.The highest polyphenolic level was determined in 60% methanol (38.81±0.39mg GAE/100 g), while lower total polyphenolic content was found in the ethyl acetate extracts (27.10±0.35mg GAE/100 g).Regarding the time for extraction, the highest content of total polyphenols in onion was obtained during extraction of 120 minutes (37.95±0.63mg GAE/100 g).
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Claims 3
Claim · model-written summary
The highest onion polyphenolic level was obtained with 60% methanol.
- Taxon
- onion
Allium cepat0 - Treatment
- 60% methanole0
- Outcome
- polyphenolic levele0
- Direction
- higheste0
- Value
- 38.81±0.39mg GAE/100 ge0
- Comparator
- ethyl acetate extractse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest polyphenolic level was determined in 60% methanol (38.81±0.39mg GAE/100 g), while lower total polyphenolic content was found in the ethyl acetate extracts (27.10±0.35mg GAE/100 g).”
t0“ONION”
Claim · model-written summary
Ethyl acetate extracts had lower onion total polyphenolic content than 60% methanol.
- Taxon
- onionAllium cepat0
- Treatment
- ethyl acetate extractse0
- Outcome
- total polyphenolic contente0
- Direction
- lowere0
- Value
- 27.10±0.35mg GAE/100 ge0
- Comparator
- 60% methanole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest polyphenolic level was determined in 60% methanol (38.81±0.39mg GAE/100 g), while lower total polyphenolic content was found in the ethyl acetate extracts (27.10±0.35mg GAE/100 g).”
t0“ONION”
Claim · model-written summary
Extraction for 120 minutes yielded the highest total polyphenol content in onion.
- Taxon
- onionAllium cepae0
- Treatment
- extraction of 120 minutese0
- Outcome
- content of total polyphenolse0
- Direction
- higheste0
- Value
- 37.95±0.63mg GAE/100 ge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regarding the time for extraction, the highest content of total polyphenols in onion was obtained during extraction of 120 minutes (37.95±0.63mg GAE/100 g).”
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