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Flavonoid C-Glycosides in Diets

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Handbook of Dietary Phytochemicals

Abstract

Flavonoids are one of the most widely occurring secondary plant constituents and are rich in vegetable and fruit diets as well as beverages of plant origin. In flavonoid glycosides, the sugars can either be linked to the aglycone via an ether bond (O-glycosides) or via a C–C- bond resulting in flavonoid C-glycosides. Their occurrence in food plants, their role in bioactivity of food, and their catabolism are covered in this chapter. The major class of C-glycosylflavonoids in food plants is represented by flavones, in addition dihydrochalcones and C-glycosylisoflavones can be found. Citrus fruits can be considered as a major source of C-glycosylflavones, whereas in most cases relatively low amounts have been found in cereals. A rich source of C-glycosylated dihydrochalcones are tomatoes, as well as rooibos and honeybush herbal teas, and the most common C-glycosylisoflavone puerarin is mainly consumed via kudzu roots. Due to their higher chemical stability in terms of hydrolysis during cooking and also after ingestion, they can be considered as a specific group within flavonoids. Their metabolic fate is clearly different from O-glycosidic flavonoids with absorption of intact glycosides, followed by phase II metabolization. However, also deglycosylation by gut microbiota and degradation of aglycones to compounds like (hydroxy)phenylpropionic acids have been recognized. Only limited data on the actual daily intake of C-glycosylflavonoids including information on content in fresh and processed food are available.

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Abbreviations

ABTS:

2,2′-azinobis-(3-ethylbenzthiazoline-6-sulfonic acid) diammonium salt

CGF:

C-glycosylflavonoids

CGT:

C-glycosyltransferase

COX:

Cyclooxygenase

CYP:

Cytochrome P450 enzymes

DPPH:

2,2-diphenyl-1-picrylhydrazyl

ESI:

Electrospray ionization

IC50:

Half maximal inhibitory concentration

IL:

Interleukin

MCF:

Human breast cancer cell line

MIC:

Minimal inhibitory concentration

mRNA:

Messenger RNA

OGF:

O-glycosylflavonoids

PGE-2:

Prostaglandin E2

P-gp:

P-glycoprotein

PXR:

Pregnane-X- receptor

RAW:

Mouse macrophage cell line

TE:

Trolox equivalents

TNF-α:

Tumor necrosis factor α

Vero:

African green monkey kidney cells

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Correspondence to F. Bucar .

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© 2020 Springer Nature Singapore Pte Ltd.

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Bucar, F., Xiao, J.B., Ochensberger, S. (2020). Flavonoid C-Glycosides in Diets. In: Xiao, J., Sarker, S., Asakawa, Y. (eds) Handbook of Dietary Phytochemicals. Springer, Singapore. https://doi.org/10.1007/978-981-13-1745-3_6-1

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  • DOI: https://doi.org/10.1007/978-981-13-1745-3_6-1

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-13-1745-3

  • Online ISBN: 978-981-13-1745-3

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