scholarly journals Flavonol Glycosides from Paederia scandens var. mairei

1990 ◽  
Vol 45 (11-12) ◽  
pp. 1081-1084 ◽  
Author(s):  
Nariyuki Ishikura ◽  
Zhi-qing Yang ◽  
Kunijiro Yoshitama ◽  
Kazu Kurosawa
Keyword(s):  
Methanolic Extract ◽  
Flavonol Glycosides ◽  
Nmr Studies ◽  
Quercetin Glycosides ◽  
Kaempferol Glycosides ◽  
Paederia Scandens

Abstract Four kaempferol glycosides and five quercetin glycosides have been isolated from a methanolic extract of Paederia scandens var. mairei leaves and stems, in which in addition four un­known glycosides of kaempferol and quercetin are present in a trace. Nine flavonol glycosides including a new glycoside quercetin 3-O-rutinoside-7-O-xylosylglucoside (paederinin) were identified by PC, HPLC, UV spectral and NMR studies.

scholarly journals Flavonol Glycosides from the Leaves of Allium Macrostemon

2015 ◽  
Vol 10 (8) ◽  
pp. 1934578X1501000 ◽  
Author(s):  
Risa Nakane ◽  
Tsukasa Iwashina
Keyword(s):  
Acid Hydrolysis ◽  
Uv Spectra ◽  
Flavonol Glycosides ◽  
Steroidal Saponins ◽  
Quercetin Glycosides ◽  
Kaempferol Glycosides ◽  
Allium Macrostemon ◽  
First Time

Twelve flavonoids were isolated from Allium macrostemon leaves. Five compounds were identified as kaempferol 3,7-di -O-glucoside (1), kaempferol 3,4′-di- O-glucoside (2), quercetin 3- O-glucoside (3), kaempferol 3- O-glucoside (4) and isorhamnetin 3- O-glucoside (5) by UV spectra, LC-MS, acid hydrolysis and HPLC comparisons with authentic standards. Other flavonoids were characterized as kaempferol glycosides (6–8, 10 and 11) and quercetin glycosides (9 and 12). Other compounds, such as steroidal saponins, have been already found from the bulbs of A. macrostemon. However, flavonoids were reported for the first time from the leaves.

scholarly journals Screening the Key Region of Sunlight Regulating the Flavonoid Profiles of Young Shoots in Tea Plants (Camellia sinensis L.) Based on a Field Experiment

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7158
Author(s):  
Jing Jin ◽  
Yi-Qing Lv ◽  
Wei-Zhong He ◽  
Da Li ◽  
Ying Ye ◽  
...  
Keyword(s):  
Field Experiment ◽  
Principal Component ◽  
Flavonol Glycosides ◽  
Light Conditions ◽  
Light Regimes ◽  
Quercetin Glycosides ◽  
Kaempferol Glycosides ◽  
Tea Plants ◽  
Tea Cultivar ◽  
Practical Field

Both UV and blue light have been reported to regulate the biosynthesis of flavonoids in tea plants; however, the respective contributions of the corresponding regions of sunlight are unclear. Additionally, different tea cultivars may respond differently to altered light conditions. We investigated the responses of different cultivars (‘Longjing 43’, ‘Zhongming 192’, ‘Wanghai 1’, ‘Jingning 1’ and ‘Zhonghuang 2’) to the shade treatments (black and colored nets) regarding the biosynthesis of flavonoids. For all cultivars, flavonol glycosides showed higher sensitivity to light conditions compared with catechins. The levels of total flavonol glycosides in the young shoots of different tea cultivars decreased with the shade percentages of polyethylene nets increasing from 70% to 95%. Myricetin glycosides and quercetin glycosides were more sensitive to light conditions than kaempferol glycosides. The principal component analysis (PCA) result indicated that shade treatment greatly impacted the profiles of flavonoids in different tea samples based on the cultivar characteristics. UV is the crucial region of sunlight enhancing flavonol glycoside biosynthesis in tea shoots, which is also slight impacted by light quality according to the results of the weighted correlation network analysis (WGCNA). This study clarified the contributions of different wavelength regions of sunlight in a field experiment, providing a potential direction for slightly bitter and astringent tea cultivar breeding and instructive guidance for practical field production of premium teas based on light regimes.

scholarly journals Flavonoid Glycosides in Brassica Species Respond to UV-B Depending on Exposure Time and Adaptation Time

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 494
Author(s):  
Susanne Neugart ◽  
Christiane Bumke-Vogt
Keyword(s):  
Brassica Species ◽  
Flavonoid Glycoside ◽  
Ultraviolet B ◽  
Flavonoid Glycosides ◽  
Production Cycle ◽  
Short Term ◽  
Greenhouse Production ◽  
Adaptation Time ◽  
Quercetin Glycosides ◽  
Kaempferol Glycosides

Recently, there have been efforts to use ultraviolet-B radiation (UV-B) as a biotechnological tool in greenhouses. Leafy Brassica species are mainly considered for their ability to synthesize glucosinolates and are valued as baby salads. They also have a remarkable concentration of chemically diverse flavonoid glycosides. In this study, the effect of short-term UV-B radiation at the end of the production cycle was investigated without affecting plant growth. The aim was to verify which exposure and adaptation time was suitable and needs to be further investigated to use UV as a biotechnological tool in greenhouse production of Brassica species. It is possible to modify the flavonoid glycoside profile of leafy Brassica species by increasing compounds that appear to have potentially high antioxidant activity. Exemplarily, the present experiment shows that kaempferol glycosides may be preferred over quercetin glycosides in response to UV-B in Brassica rapa ssp. chinensis, for example, whereas other species appear to prefer quercetin glycosides over kaempferol glycosides, such as Brassica oleracea var. sabellica or Brassica carinata. However, the response to short-term UV-B treatment is species-specific and conclusions on exposure and adaptation time cannot be unified but must be drawn separately for each species.

Flavonoids and UV Photoprotection in Arabidopsis Mutants

2001 ◽  
Vol 56 (9-10) ◽  
pp. 745-754 ◽  
Author(s):  
Ken G Ryan ◽  
Ewald E Swinny ◽  
Chris Winefield ◽  
Kenneth R Markham
Keyword(s):  
Crucial Role ◽  
Hydroxycinnamic Acid ◽  
Ultraviolet B ◽  
Uvb Radiation ◽  
Wild Type ◽  
Hydroxycinnamic Acid Derivatives ◽  
Quercetin Glycosides ◽  
Kaempferol Glycosides ◽  
Low Levels ◽  
High Level

AbstractWild-type Arabidopsis L. leaves exposed to low ultraviolet-B (U V B ) conditions contained predominantly kaempferol glycosides, with low levels of quercetin glycosides. The flavonoid level doubled on treatment with UVB and an increase in the ratio of quercetin: kaempferol was observed. These results suggest that flavonols protect Arabidopsis plants from UVB damage, and indicate that the flavonoid 3’-hydroxylase (F3’H) enzyme, which converts dihydrokaempferol to dihydroquercetin, may play a crucial role. The tt7 mutant lacks this gene and, after treatment with sub-ambient UVB, contained kaempferol glycosides exclusively, to a level of total flavonols similar to that in wild-type Arabidopsis. Total flavonols after enhanced UVB treatment were higher in tt7 than in similarly treated wild-type plants, and only kaempferol glycosides were detected. Despite this high level, tt7 plants were less tolerant of UVB radiation than wild-type plants. These observations suggests that kaempferol is a less effective photoprotectant than quercetin. The chalcone isomerase (CHI) mutant (tt5) surprisingly did not accumulate naringenin chalcone, and this suggests that the mutation may not be restricted to the CHI gene alone. The concentration of hydroxycinnamic acid derivatives did not change with UVB treatment in most varieties indicating that their role in UV photoprotection may be subordinate to that of the flavonoids.

scholarly journals Kaempferol Glycosides in the Flowers of Carnation and their Contribution to the Creamy White Flower Color

2010 ◽  
Vol 5 (12) ◽  
pp. 1934578X1000501 ◽  
Author(s):  
Tsukasa Iwashina ◽  
Masa-atsu Yamaguchi ◽  
Masayoshi Nakayama ◽  
Takashi Onozaki ◽  
Hiroyuki Yoshida ◽  
...  
Keyword(s):  
Nmr Spectra ◽  
Flower Color ◽  
White Flower ◽  
Flavonol Glycosides ◽  
White Line ◽  
Kaempferol Glycoside ◽  
Kaempferol Glycosides ◽  
C Nmr ◽  
Pure White

Three flavonol glycosides were isolated from the flowers of carnation cultivars ‘White Wink’ and ‘Honey Moon’. They were identified from their UV, MS, 1H and 13C NMR spectra as kaempferol 3 -O-neohesperidoside, kaempferol 3 -O-sophoroside and kaempferol 3- O-glucosyl-(1→2)-[rhamnosyl-(1→6)-glucoside]. Referring to previous reports, flavonols occurring in carnation flowers are characterized as kaempferol 3- O-glucosides with additional sugars binding at the 2 and/or 6-positions of the glucose. The kaempferol glycoside contents of a nearly pure white flower and some creamy white flower lines were compared. Although the major glycoside was different in each line, the total kaempferol contents of the creamy white lines were from 5.9 to 20.9 times higher than the pure white line. Thus, in carnations, kaempferol glycosides surely contribute to the creamy tone of white flowers.

scholarly journals Isolation and Characterization of Secondary Metabilites and Evaluation of Antimicrobial, Antioxidant and Thrombolytic Potentials of Erythrina variegata L. Bark

2019 ◽  
Vol 31 (8) ◽  
pp. 1842-1846
Author(s):  
Fatema Tabassum ◽  
Choudhury Mahmood Hasan ◽  
Mohammad Mehedi Masud ◽  
Md. Imran Nur Manik ◽  
Monira Ahsan
Keyword(s):  
Methanolic Extract ◽  
Authentic Sample ◽  
Stem Bark ◽  
Moderate Activity ◽  
Zone Of Inhibition ◽  
Nmr Studies ◽  
Erythrina Variegata ◽  
Isolation And Characterization ◽  
Ic50 Value

Six compounds, sitosta-4-en-3-one (1), 3β,28-dihydroxyolean-12-en (2), scandenone (3), alpinum isoflavone (4), stigmasterol (5) and lupeol (6) were isolated from the methanol soluble extract of the stem bark of Erythrina variegata. The structure of the compounds was established by extensive NMR studies as well as co-TLC with authentic sample. The petroleum ether, carbon tetrachloride, chloroform and aqueous soluble fractions of the methanolic extract of Erythrina variegata were evaluated for antimicrobial, antioxidant and thrombolytic properties. In the antimicrobial study, most of the fractions of the extract exhibited mild to moderate antimicrobial activity where the zone of inhibition were ranging from 7.69 to 19.51 mm. The chloroform soluble fraction showed significant antioxidant activity with IC50 value 66.28 μg/mL as compared to standard BHT (IC50 value 23.09 μg/mL). The thrombolytic property of different extracts of E. variegata exhibited moderate activity ranging from 31.25 to 57.78 %.

scholarly journals Polyphenol Diversity and Antioxidant Activity of European Cistus creticus L. (Cistaceae) Compared to Six Further, Partly Sympatric Cistus Species

Plants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 615
Author(s):  
Brigitte Lukas ◽  
Laura Bragagna ◽  
Katharina Starzyk ◽  
Klaudia Labedz ◽  
Klaus Stolze ◽  
...  
Keyword(s):  
High Performance ◽  
Flavonol Glycosides ◽  
Central Position ◽  
Quantitative Composition ◽  
Antioxidative Capacity ◽  
Central Mediterranean ◽  
Main Compound ◽  
Quercetin Glycosides ◽  
Northern Shore ◽  
Cistus Creticus

This investigation focused on the qualitative and quantitative composition of polyphenolic compounds of Mediterranean northern shore Cistus creticus and six further, partly sympatric Cistus species (C. albidus, C. crispus, C. ladanifer, C. monspeliensis, C. parviflorus, C. salviifolius). Aqueous extracts of 1153 individual plants from 13 countries were analyzed via high performance liquid chromatography (HPLC). The extracts of C. creticus were primarily composed of two ellagitannins (punicalagin and punicalagin gallate) and nine flavonol glycosides (myricetin and quercetin glycosides, with m-3-O-rhamnoside as the dominant main compound). Differences in the proportions of punicalagin derivatives and flavonol glycosides allowed the classification into two chemovariants. Plants containing punicalagin derivatives and flavonol glycosides were especially abundant in the western and central Mediterranean areas and in Cyprus. From Albania eastwards, punicalagin and punicalagin gallate were of much lesser importance and the predominant chemovariant there was a nearly pure flavonol type. With its two chemovariants, C. creticus takes a central position between the flavonol-rich, purple-flowered clade (besides C. creticus, here represented by C. albidus and C. crispus) and the more ellagitannin-rich, white- or whitish-pink-flowered clade (here represented by C. ladanifer, C. monspeliensis, C. parviflorus and C. salviifolius). The median antioxidative capacity of C. creticus plant material was, with 166 mg Trolox equivalents/g dry wt, about half of the antioxidative capacity of C. ladanifer (301 mg te/g dry wt), the species with the highest antioxidative potential.

In vitro availability of kaempferol glycosides from cream formulations of methanolic extract of the leaves of Melilotus elegans

2005 ◽  
Vol 60 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Tsige Gebre-Mariam ◽  
Kaleab Asres ◽  
Melkamu Getie ◽  
Abebe Endale ◽  
Reinhard Neubert ◽  
...  
Keyword(s):  
Methanolic Extract ◽  
In Vitro Availability ◽  
Kaempferol Glycosides

Kaempferol Glycosides in Asplenium scolopendvium Newm

1990 ◽  
Vol 45 (3-4) ◽  
pp. 143-146 ◽  
Author(s):  
Mizuo Mizuno ◽  
Yosuke Kyotani ◽  
Munekazu Iinuma ◽  
Toshiyuki Tanaka ◽  
Hiroyuki Kojima ◽  
...  
Keyword(s):  
Spectral Data ◽  
Long Range ◽  
Flavonol Glycosides ◽  
Kaempferol Glycosides

Abstract Five kaempferol glycosides in the fronds of Asplenium scolopendrium were isolated . The structures of three novel flavonol glycosides were determined to be kaempferol 3-O -β-D -glucopyranosyl-( 1→3 )-β -D -(2 -O -caffeoyl)glucopyranoside 7 -O -α -L -rhamnopyranoside , kaempferol 3 -O -β -D -glucopyranosyl-(1→3 )-β -D -glucopyranoside 7 -O -α -L -rhamnopyranoside and kaempferol 3 -O -(2 -O -caffeoyl)-β -D -glucopyranoside 7 -O -α -L -rhamnopyranosideby means of spectral data (FAB-M S, 1H-1H, 1H -13C COSY and 1H-13C long range COSY), respectively.

scholarly journals Fruits of Rosa brunonii – A Source of Antioxidant Phenolic Compounds

2017 ◽  
Vol 12 (11) ◽  
pp. 1934578X1701201
Author(s):  
Muhammad Ishaque ◽  
Yamin BiBi ◽  
Karin M. Valant–Vetschera ◽  
Johann Schinnerl ◽  
Markus Bacher
Keyword(s):  
Mass Spectrometry ◽  
Phenolic Compounds ◽  
Biological Activities ◽  
Radical Scavenging ◽  
2D Nmr ◽  
Flavonol Glycosides ◽  
Northern Pakistan ◽  
Dpph Assay ◽  
2D Nmr Spectroscopy ◽  
Kaempferol Glycosides

Phytochemical examination of matured fruits of Rosa brunonii collected in Northern Pakistan led to the isolation of three flavonol glycosides quercetin-3- O-rhamnoside (1), and the kaempferol glycosides astragalin (2) and tiliroside (3). Their structures were elucidated by 1D– and 2D–NMR spectroscopy and mass spectrometry. Radical scavenging activities of the crude extract and isolated compounds were assessed by a DPPH assay. The results show strong antioxidative activities of tiliroside (3) and lower activities of astragalin (2) and quercetin-3- O-rhamnoside (1). These data confirm previous reports and underline the biological activities of flavonol glycosides.

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