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14.03.2023

The life extenders in onion peel

You can easily find articles and videos on the web that tell how to dry, grind and use the peels of onions in the kitchen. This information is not only useful for people who use their money sparingly. According to Japanese research, the skins of the onion are also an excellent source of quercetin and its analogues.


You can easily find articles and videos on the web that tell how to dry, grind and use the peels of onions in the kitchen. This information is not only useful for people who use their money sparingly. According to Japanese research, the skins of the onion are also an excellent source of quercetin and its analogues.


Study
The researchers used HPLC to determine how much quercetin and two other quercetin analogues were present in yellow [SK], red [SR] and white onions [AS]. In this study, the yellow onion - the most consumed variant in the West - scored slightly better than the red onion.

Whether that is really the case, we wonder. According to other research, in which more compounds were included, the red onion in particular contains more quercetin analogues than the yellow onion. [Nippon Shokuhin Kagaku Kogaku Kaishi Vol. 43, No. 5, 642-9 (1996).]

Click on the figure for a larger version.


You can easily find articles and videos on the web that tell how to dry, grind and use the peels of onions in the kitchen. This information is not only useful for people who use their money sparingly. According to Japanese research, the skins of the onion are also an excellent source of quercetin and its analogues.


The fact that there are few quercetin compounds in white onions has also been shown in other studies. Remarkably, the skin of the onion contained the highest concentrations of flavonoids.

When the Japanese gave nematodes quercetin and the quercetin analogues Q3M and Q3C, they saw that these compounds extended the lifespan of the worms. Especially Q3M - in full: quercetin 3-O-beta-D-glucopyranoside-(4-1)-beta-D-glucopyranoside proved to be an effective life extender. [Figure]


You can easily find articles and videos on the web that tell how to dry, grind and use the peels of onions in the kitchen. This information is not only useful for people who use their money sparingly. According to Japanese research, the skins of the onion are also an excellent source of quercetin and its analogues.


You can easily find articles and videos on the web that tell how to dry, grind and use the peels of onions in the kitchen. This information is not only useful for people who use their money sparingly. According to Japanese research, the skins of the onion are also an excellent source of quercetin and its analogues.


Mechanism
Finally, the researchers determined the biological effects of Q3M at the molecular level. Q3M activated the activity of a number of longevity genes. The activity of the old-1 gene in particular went up.

Old-1 becomes active when nematodes are exposed to mild stressors, such as UV light, heat and oxidants. [Curr Biol. 2001 Oct 2;11(19):1517-23.]

Before and at the end of the supplementation period, the researchers used a battery of standard tests to determine the subjects' cognitive abilities.

Conclusion
The highest concentration of quercetin analogs is therefore in the part of the onions that consumers in their kitchens, and food companies that process onions, still mindlessly throw away. That is interesting for foodies, but also for the supplement industry.

"Therefore, the extraction of the flavonoids from the peel would help not only in reducing waste but also in recovering useful compounds that could greatly benefit human health," the researchers write.

Source:
J. Agric. Food Chem. 2011, 59, 5927-34.

More:
Get more quercetin from onions 11.05.2021

Archives:
Quercetin
Longevity
Onions


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