Deconjugation and Degradation of Flavonol Glycosides by Pig Cecal Microbiota Characterized by Fluorescence in Situ Hybridization (FISH)
| ISSN: | 1520-5118 0021-8561 |
|---|---|
| DOI: | 10.1021/jf073444o |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec19c68d57401753b3f152681893fd38 https://doi.org/10.1021/jf073444o |
| Rights: | RESTRICTED |
| Přírůstkové číslo: | edsair.doi.dedup.....ec19c68d57401753b3f152681893fd38 |
| Autor: | Alexander W. Friedrich, Hans-Ulrich Humpf, Eva-Maria Hein, Gordon van't Slot, Katrin Rose |
| Rok vydání: | 2008 |
| Předmět: |
Flavonols
Swine Phloroglucinol Biology Fluorescence Structure-Activity Relationship chemistry.chemical_compound Phenols Animals Glycosides Cecum In Situ Hybridization In Situ Hybridization Fluorescence Flavonoids chemistry.chemical_classification Bacteria Polyphenols Glycoside Glycosidic bond General Chemistry Aglycone chemistry Biochemistry Apigenin Quercetin General Agricultural and Biological Sciences |
| Zdroj: | Journal of Agricultural and Food Chemistry, 56(6), 2281-90. AMER CHEMICAL SOC |
| ISSN: | 1520-5118 0021-8561 |
| DOI: | 10.1021/jf073444o |
| Popis: | As the bioavailability of flavonoids is influenced by intestinal metabolism, we have investigated the microbial deconjugation and degradation of several flavonols and flavonol glycosides using the pig cecum in vitro model system developed in our group. For this model system the microbiota was directly isolated from the cecal lumen of freshly slaughtered pigs. The characterization of the cecal microbiota by fluorescence in situ hybridization (FISH) with 16S rRNA-based oligonucleotide probes confirmed the suitability of the model system for studying intestinal metabolism by the human microbiota. We have investigated the microbial degradation of quercetin-3-O-beta-d-rutinoside 1, quercetin-3-O-beta-d-glucopyranoside 2, quercetin-4'-O-beta-d-glucopyranoside 3, quercetin-3-O-beta-d-galactopyranoside 4, quercetin-3- O-beta-d-rhamnopyranoside 5, quercetin-3- O-[alpha-l-dirhamnopyranosyl-(1-->2)-(1-->6)-beta-d-glucopyranoside 6, kaempferol-3-O-[alpha-l-dirhamnopyranosyl-(1-->2)-(1-->6)-beta-d-glucopyranoside 7, apigenin 8, apigenin-8- C-glucoside (vitexin) 9, and feruloyl-O-beta-d-glucopyranoside 10 (100 microM), representing flavonoids with different aglycones, sugar moieties, and types of glycosidic bonds. The degradation rate was monitored using HPLC-DAD. The flavonol O-glycosides under study were almost completely metabolized by the intestinal microbiota within 20 min and 4 h depending on the sugar moiety and the type of glycosidic bond. The degradation rates of the quercetin monoglycosides showed a clear dependency on the hydroxyl pattern of the sugar moiety. The degradation of 2 with all hydroxyl groups of the glucose in the equatorial position was the fastest. The intestinal metabolism of di- and trisaccharides was much slower compared to the monoglycosides. The structure of the aglycone has not much influence on the intestinal metabolism; however, the type of glycosidic bond ( C- or O-glycoside) has substantial influence on the degradation rate. The liberated aglycones were completely metabolized within 8 h. Phenolic compounds such as 3,4-dihydroxyphenylacetic acid 12, 4-hydroxyphenylacetic acid 13, and phloroglucinol 18 were detected by GC-MS as main degradation products. |
| Databáze: | OpenAIRE |
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