(Article)
a Institute of Agriculture and Tourism, Karla Huguesa 8, Poreč, Croatia
b Materials Research Centre METRIS, Istrian Development Agency, Zagrebačka 30, Pula, Croatia
c Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, Zagreb, Croatia
b Materials Research Centre METRIS, Istrian Development Agency, Zagrebačka 30, Pula, Croatia
c Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, Zagreb, Croatia
Abstract
Spectrophotometric and chromatographic analysis of phenolics in water and ethanolic extracts of wild asparagus, butcher’s broom and black bryony from Croatia was conducted. Their antioxidant capacity (ABTS, DPPH and FRAP assay) and energy content were determined. The gastrointestinal stability of detected phenolics was determined using a two-phase in vitro digestion method with human enzymes. The highest phenolics yield, radical scavenging activity and ferric reducing antioxidant potential were recorded in 40 % ethanolic extract of black bryony, with glycosylated forms of kaempferol as dominant components. Quercetin-3-O-rutinoside and isorhamnetin-3-O-rutinoside were dominant phenolics in all wild asparagus extracts, and salicylic acid was predominant in butcher’s broom 40 % ethanolic extract. Phenolic acids of the three species were not stable during gastric and duodenal phases of simulated digestion. Two main black bryony kaempferol glycosides were best preserved after digestion (50 % of each). Black bryony contains more energy than wild asparagus and butcher’s broom. Accordingly, we propose black bryony as a valuable source of antioxidant kaempferol glycosides with relevant gastrointestinal stability and higher energy content than so far more conventional vegetable wild asparagus. © 2015, Springer-Verlag Berlin Heidelberg.
Author keywords
Human digestive enzymes; Isorhamnetin-3-O-rutinoside; Kaempferol; Quercetin-3-O-rutinoside; RP-HPLC; Salicylic acid
Indexed keywords
Engineering controlled terms: Antioxidants; Chromatographic analysis; Enzymes; Phenols; Plants (botany); Salicylic acid; Sugars
Digestive enzymes; Isorhamnetin-3-O-rutinoside; Kaempferol; Quercetin-3-O-rutinoside; RP-HPLC
Engineering main heading: Flavonoids
Species Index: Asparagus; Bryonia
ISSN: 14382377Source Type: Journal Original language: English
DOI: 10.1007/s00217-015-2486-yDocument Type: Article
Publisher: Springer Verlag