Stability and transformation of major flavonols in onion (Allium cepa) solid wastes View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2010-12-22

AUTHORS

Zied Khiari, Dimitris P. Makris

ABSTRACT

Onion solid wastes were analysed using HPLC and LC / MS and the major polyphenols detected were quercetin, quercetin 4′-O-glucoside, accompanied by protocatechuic acid and a benzofuranone derivative. The latter two compounds have been demonstrated as some of the degradation products that might arise as a result of peroxidase-mediated decomposition of quercetin. These four substances, along with two principal enzymes implicated in flavonols breakdown, β-glycosidase and peroxidise, were monitored throughout an examination period of 48 h, in ground onion solid waste. The determinations showed that quercetin 4′-O-glucoside content increased by 13.3%, while quercetin, benzofuranone derivative and protocatechuic acid contents increased by 68.6, 37.5 and 58.4%, respectively. β-Glycosidase activity exhibited fluctuations and increased by 38.2%, whereas the POD showed a constant increasing trend, leading in 21.7% higher activity. On such a ground, a hypothesis was set up to explain transformations of flavonols. More... »

PAGES

489-494

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s13197-010-0201-3

DOI

http://dx.doi.org/10.1007/s13197-010-0201-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1001475855

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/23904658


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