Flavonoid aglycones from Eriodictyon californicum resin and their implications for herbivory and UV screening

1983 ◽  
Vol 11 (3) ◽  
pp. 211-215 ◽  
Author(s):  
Nelson D. Johnson
Keyword(s):  
Flavonoid Aglycones ◽  
Eriodictyon Californicum

scholarly journals Bioconversion of Flavonoid Glycosides from Hippophae rhamnoides Leaves into Flavonoid Aglycones by Eurotium amstelodami

2019 ◽  
Vol 7 (5) ◽  
pp. 122 ◽  
Author(s):  
Qiuya Gu ◽  
Guoliang Duan ◽  
Xiaobin Yu
Keyword(s):  
Antioxidative Activity ◽  
Hippophae Rhamnoides ◽  
Flavonoid Glycosides ◽  
Total Phenolic ◽  
Total Phenolic Compounds ◽  
Flavonoid Aglycones ◽  
Hippophaë Rhamnoides ◽  
Tea Industry ◽  
Functional Factors ◽  
Flowering Process

The flowering process has been reported to play crucial roles in improving the flavor and efficacy of fermented tea. Hippophae rhamnoides leaves containing many beneficial ingredients are a suitable plant source for tea processing. In this study, we isolated a β-glucosidase-producing fungus Eurotium amstelodami BSX001 from the fermented tea and used Hippophae rhamnoides leaves (HRL) as a substrate to explore the detailed process of bioconversion of some important functional factors. The results show that the contents of total phenolic compounds and flavonoids increased significantly after seven days, especially flavonoid aglycones (e.g., quercetin, kaempferol, and isorhamnetin). Such compounds greatly enhance the antioxidative activity of fermented products. Metabolic analysis of the standard compounds (rutin, quercetin-3-glucoside, kaempferol-3-glucoside, quercetin, isorhamnetin-3-glucoside, isorhamnetin, and kaempferol) further confirmed the effective biotransformation by E. amstelodami. Mechanisms of the bioconversion could be involved in deglycosylation, dihydroxylation, and O-methylation. Our findings expand the understanding of tea fermentation process and provide further guidance for the fermented tea industry.

Flavonoid aglycones from the leaf surfaces of someLabiatae species

1990 ◽  
Vol 173 (3-4) ◽  
pp. 109-118 ◽  
Author(s):  
F. A. Tom�s-Barber�n ◽  
E. Wollenweber
Keyword(s):  
Flavonoid Aglycones ◽  
Leaf Surfaces

Acylated flavonoid aglycones from Gnaphalium robustum

1990 ◽  
Vol 29 (4) ◽  
pp. 1342-1343 ◽  
Author(s):  
Alejandro Urzua ◽  
Pedro Cuadra
Keyword(s):  
Flavonoid Aglycones

VARIATION AND LOCALIZATION OF FLAVONOID AGLYCONES IN HELIANTHUS ANNUUS (COMPOSITAE)

1987 ◽  
Vol 74 (2) ◽  
pp. 224-233 ◽  
Author(s):  
Loren H. Rleseberg ◽  
Douglas E. Soltis ◽  
Doug Arnold
Keyword(s):  
Helianthus Annuus ◽  
Flavonoid Aglycones

Notizen: Exkret-Flavonoide bei Hieracium intybaceum (Asteraceae) / Exudate Flavanoids in Hieraceum intybaceum, an Alpine Hawkweed (Asteraceae)

1984 ◽  
Vol 39 (7-8) ◽  
pp. 833-834 ◽  
Author(s):  
E. Wollenweber
Keyword(s):  
Glandular Trichomes ◽  
Flavonoid Aglycones ◽  
First Time

Abstract The hawkweed Hieracium intybaceum is covered with glandular trichomes that produce a sticky resinous exudate. This material, assumedly of terpenoid nature, contains trace amounts of flavonoid aglycones. They could be identified to be known flavones and flavanones. This is the first time that an alpine Asteraceae was found to exude flavonoid aglycones.

scholarly journals Flavonoids from the Japanese Monotypic Genus, Nipponanthemum

2012 ◽  
Vol 7 (8) ◽  
pp. 1934578X1200700 ◽  
Author(s):  
Ayumi Uehara ◽  
Tsukasa Iwashina
Keyword(s):  
Methyl Ether ◽  
Endemic Species ◽  
Leaf Surface ◽  
Monotypic Genus ◽  
Flavonoid Aglycones ◽  
First Time

Foliar flavonoids of Nipponanthemum, which is a monotypic genus and consists of only one Japanese endemic species, N. nipponicum, were isolated for the first time. Fifteen flavonoids, i.e. six glycosides, quercetin 3,7-di- O-glucoside, vicenin-2, quercetin 3- O-glucoside, luteolin 7- O-glucoside, kaempferol 3- O-glucoside and apigenin 7- O-glucoside, and nine aglycones, luteolin, nepetin, quercetin 3-methyl ether, axillarin, apigenin, hispidulin, chrysoeriol, jaceosidin and sudachitin were identified. Of these compounds, the flavonoid aglycones existed on the leaf surface.

scholarly journals Exudate Flavonoids of Some Juglandaceae

2009 ◽  
Vol 4 (2) ◽  
pp. 1934578X0900400
Author(s):  
Eckhard Wollenweber ◽  
Marion Dörr
Keyword(s):  
Plant Organs ◽  
Future Studies ◽  
Flavonoid Aglycones

Six species of Juglandaceae have been checked for the occurrence of flavonoid aglycones on their leaf and fruit surfaces. Except for one, they exhibit flavonols, mostly methyl ethers of kaempferol and quercetin, including 6- O-substituted derivatives. Apigenin and acacetin are the only flavones found so far. Flavonoids accumulated on leaves are different from those excreted on green fruits. It has become evident that in future studies greater attention must be paid to the localization of flavonoid aglycones in different plant organs.

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