Polyphenols of Rosa L. Leaves Extracts and their Radical Scavenging Activity

Nowak, Renata; Gawlik‐Dziki, Urszula

doi:10.1515/znc-2007-1-206

Cited by 72 publications

(78 citation statements)

References 29 publications

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“…In our study Acta Alimentaria 44, 2015 increase of total polyphenolic content was followed by a slight increase in the content of quercetin in all studied onion cultivars, however, without statistical differences (P>0.05). Our results differ from those published by NOWAK and GAWLIK-DZIKI (2007), where the authors found statistically signifi cant positive correlation between quercetin and total fl avonols content. The results of the present study require further experiments to complete the whole task.…”

Section: Resultscontrasting

confidence: 99%

Dynamics of quercetin formation in onion (Allium cepaL.) during vegetation

Bystrická¹,

Musilová²,

Tomáš³

et al. 2015

Acta Alimentaria

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Onion bulbs (Allium cepa L.) are good sources of fl avonoids. The aim of this study was to analyse the changes in dynamics of quercetin formation in three varieties of onions (white, yellow, and red) during the vegetation period. Quercetin content was determined after acid hydrolysis (1.2 M HCl in 50% aqueous methanol) by high-performance liquid chromatography (HPLC). The content of total phenolics was determined using Folin-Ciocalteu reagent (FCR) according to LACHMAN and co-workers (2003). The content of polyphenols in onion ranged from 2893 to 6052 mg kg -1 and the content of quercetin ranged from 52.44 to 280.72 mg kg -1 in fresh matter. The highest content of polyphenols and quercetin was found in the red variety. According to statistical analysis the dynamic of quercetin formation in all cultivars had statistically moderate (P<0.05) increasing tendency. Increasing content of polyphenols was accompanied with slight increase of quercetin, but the differences remained insignifi cant (P0.05).Keywords: onion, quercetin, total polyphenolics, dynamicsAllium genus vegetables belong to a very important group of vegetables in the Slovak Republic. Onions (Allium cepa L.) are one of the world's oldest cultivated vegetables and are the second most produced vegetable crop after tomatoes (GRIFFITHS et al., 2002). This vegetable is often classifi ed as medicinal plant and also has signifi cance as spice plant of high dietary value. From the point of view of the consumers and agricultural producers the most widespread type of Allium vegetables is onion (Allium cepa L.). The main production areas are China, Iran, India, and the United States. Onion (Allium cepa L.) has a great importance in human nutrition and has been recognized as an important source of valuable phytonutrients as fl avonoids, fructooligosaccharides, thiosulphinates and other sulphur compounds (SLIMESTAD et al., 2007). Onion is mainly rich in fl avonoids. The amount of phenolic compounds signifi cantly changes during the maturation process. WANG and co-workers (2009) found that amounts of cyanidinbased anthocyanins increased during fruit ripening, but other polyphenols, such as ellagic acid, quercetin 3-glucoside, quercetin derivative, and kaempferol 3-glucuronide, signifi cantly decreased during fruit ripening. The changes in the rutin content are often connected with the developmental stage of the crop. In common buckwheat the rutin content in leaves increases with the age of the plant, is at the maximum at the stage of maturity or at the stage of full fl owering in case of dry weather conditions after fl owering, and in stems the rutin content slightly decreases (KALINOVA et al., 2006). Flavonoids improve blood circulation, reduce infl ammatory processes and block the development of cancer cells (CHENG et al., 2003;

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Section: Resultscontrasting

confidence: 99%

Dynamics of quercetin formation in onion (Allium cepaL.) during vegetation

Bystrická¹,

Musilová²,

Tomáš³

et al. 2015

Acta Alimentaria

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“…The free radical scavenging activity of the isolated compound was estimated according to the procedure described by Brand-Williams, Cuvelier & Berset (1995) with some modifications [23,24]. Ethanol of analytical grade (POCH, Poland), 1,1-diphenyl-2-picrylhydrazyl radical -DPPH .…”

Section: Antioxidant Assaymentioning

confidence: 99%

“…The absorbance was measured at 517 nm after incubating the mixture at room temperature for 30 min in the dark. The antiradical activity was expressed as EC 50 (antiradical dose required to cause a 50% inhibition), which was calculated by the following formula: [(A blank − A sample )/A sample ] × 100, where A blank is the absorbance of the DPPH radical solution and A sample is the absorbance of the DPPH radical solution after the addition of the sample [24]. EC 50 was obtained by linear regression analysis of the dose-response curve, plotted between % inhibition and concentration (µg/ ml).…”

Section: Antioxidant Assaymentioning

confidence: 99%

“…Recent studies have proved that the antioxidant properties (to remove free radicals) of medicinal plants are due to their phenolic compounds, such as flavonoids, phenolic acids, and tannins [26]. The DPPH (1,1-diphenyl-2-picrylhydrazyl) method is one of the most frequently used for testing the antiradical activity of plant extracts and compounds [1,24]. There is only one report in the literature about the high radical scavenging effect of methanol extract of H. pilosella [9].…”

Section: Biological Activitiesmentioning

confidence: 99%

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Biological activity of new flavonoid from Hieracium pilosella L.

et al. 2011

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Hieracium pilosella L. (Asteraceae) is a well-known plant used in ethno-medicine as its inflorescences are particularly rich in beneficial polyphenolics. This research aimed to elucidate the structure of a new flavone glycoside isolated from the inflorescences of Hieracium pilosella and evaluate its antioxidant, antimicrobial and antiproliferative activities. The chromatographic methods were successfully applied to isolate the new flavonoid. Its structure was determined by subsequent UV, NMR and MS experiments and identified as isoetin 4′-O-β-D-glucopyranoside. Free radical scavenging capacity was examined by measuring the scavenging activity of the new isoetin derivative on 2,2-diphenyl-1-picrylhydrazyl (DPPH). The compound was also screened for spectrum of antimicrobial activity using the agar well diffusion method. Minimum inhibitory concentration (MIC) for Pseudomonas aeruginosa ATCC 9027 was performed by the micro-dilution broth method. The antiproliferative effect of tested glycoside was assessed in two human tumor cell lines derived from lung (A549) and colon (HT-29) carcinoma and cell proliferation was determined by means of MTT method. The tested compound showed high antiradical activity, reducing the DPPH? with EC50 7.9 μM (3.7 µg/ml) and exhibited narrow antimicrobial spectrum among tested microorganisms. The compound was active against Pseudomonas aeruginosa ATCC 9027 (MIC 125 μg/ml) which is prone to causing infections that are difficult to treat due to it developing extremely rapid antibiotic resistance. In the antiproliferative studies, cell proliferation of the colon (HT-29) carcinoma cell line was significantly decreased after exposure to the compound. The results indicate that isoetin 4′-O-β-D-glucopyranoside possesses antioxidant capacity and very promising antibacterial activity and could have uses as an effective antipseudomonal agent as well a antiproliferative agent.

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“…The functional properties of some Rosa species were attributable to a wide array of bioactive ingredients such as minerals, fatty acids, volatile oils, ascorbic acid, phenols, flavonoids, tannins and sugar [7][8][9][10][11] . Despite the substantial data on the phytochemistry of some Rosa species namely R. canina, there are a dearth of information about the chemical constituents of Rosa x alba.…”

Section: Introductionmentioning

confidence: 99%

Rosa × alba: source of essential minerals and volatile oils

Hosni¹

2011

Nat. Prod. Bioprospect.

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Rosa x alba is cultivated almost exclusively for the production of aromatic water and fruits widely used as ingredients in some traditional food preparations sold commercially. Results of the proximate and elemental analyses revealed that flowers exhibited higher moisture content while the dry matter content was higher in leaves. Total fat and ash was higher in fruits when compared with leaves and flowers. All studied organs were found to be rich in essential mineral such as K, Ca, P and Mg. Qualitative and quantitative analysis of the volatile oils revealed different composition patterns between organs. Linalool and geraniol were found as major constituents of the leaf oil whereas 2-phenethyl alcohol and eugenol were the major constituents of the floral oil. In contrast, fruits showed very distinct composition and alkanes/alkenes were found to have the major contribution. The present composition could justify the traditional use of Rosa x alba which could be considered as a potential source of essential minerals and volatile constituents.

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Polyphenols of Rosa L. Leaves Extracts and their Radical Scavenging Activity

Cited by 72 publications

References 29 publications

Dynamics of quercetin formation in onion (Allium cepaL.) during vegetation

Dynamics of quercetin formation in onion (Allium cepaL.) during vegetation

Biological activity of new flavonoid from Hieracium pilosella L.

Rosa × alba: source of essential minerals and volatile oils

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