Abstract
This chapter is dedicated to the natural antioxidants having 2-phenyl-4H-1-benzopyran-4-one skeleton and hydroxyl groups on the aromatic rings only. The main physical-chemical and biological properties, as well as the natural occurrence and food applications of the main flavones, are discussed. The chemistry and functionality of the main compounds from this class allow identifying their biological activities and their further applications. This part is focused on chrysin, apigenin, acacetin, baicalein, luteolin, diosmetin, scutellarein, hispidulin, tricetin, sinensetin, tangeretin, serpyllin, nobiletin, and scaposin. However, the number of flavone compounds with pharmaceutical and food applications is much higher than this list. Correlations between structural characteristics and properties of flavones have also been presented in this chapter. We have focused on the main groups responsible for many biological and antioxidant activities and properties related to flavone bioavailability. Thus, phenolic hydroxyl groups and solubility parameters were considered. On the other hand, molecular surface accessibility, oxidation susceptibility, and antioxidant mechanisms were discussed. The biosynthesis of the main flavone compounds and enhancing their enzymatic production for industrial purposes are also presented in this chapter. A significant part of this chapter is dedicated to the identification and quantification of flavone aglycones and glycosides in plants, vegetables, fruits, grains, and foods, as well as their interactions with food ingredients and matrices, production, and applications in food products. The separation and purification techniques and modern analytical methods used for flavone evaluation were surveyed, pointing out the most recent studies in the field. Finally, conclusions and future perspectives related to flavone research, especially their applications in food and pharmaceutical fields, have been presented.
Abbreviations
- 1H/13C-NMR:
-
1H/13C-nuclear magnetic resonance
- ABTS·+:
-
2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical cation
- CD:
-
Circular dichroism
- CFI:
-
Chalcone-flavanone isomerase
- CHS:
-
Chalcone synthase
- CoA:
-
Coenzyme A
- COVID-19:
-
Coronavirus disease 2019
- CUPRAC:
-
Cupric reducing antioxidant capacity
- DPPH·:
-
2,2-diphenyl-1-pycrylhydrazyl radical
- DW:
-
Dry weight
- EC:
-
Enzyme Commission numbers
- EC50:
-
Half maximal effective concentration
- Ecugd:
-
Uridine diphosphate glucose dehydrogenase from Escherichia coli
- EI/ESI-MS:
-
Electrospray ionization-mass spectrometry
- F3′5′H:
-
Flavonoid 3′,5′-hydroxylase
- FAB-MS:
-
Fast atom bombardment-mass spectrometry
- FAME:
-
Fatty acid methyl ester
- FRAP:
-
Ferric reducing antioxidant power
- FS:
-
Flavone synthase
- FT-IR:
-
Fourier transform infrared spectroscopy
- FW:
-
Fresh weight
- GAE:
-
Gallic acid equivalent
- GC-FID/MS:
-
Gas chromatography coupled with flame ionization detector/mass spectrometry detector
- GEArray:
-
Gene expression profiles of 96 genes indicative of mouse stress and toxicity
- GmSUS:
-
Glycine max sucrose synthase
- Gpx:
-
Glutathione peroxidase
- HAT:
-
H-atom transfer
- HHP:
-
High hydrostatic pressure
- HOMO:
-
Highest occupied molecular orbital
- HPLC-UV-Vis/DAD/MS:
-
High-pressure liquid chromatography coupled with ultraviolet-visible spectrophotometric detector/diode array detector/mass spectrometry detector
- HPLC-MS/MS/MSn/MRM-MS:
-
Liquid chromatography coupled with tandem mass spectrometry (MS/MS or MSn)/ multiple reaction monitoring-mass spectrometry detector
- HP-TLC:
-
High-performance thin layer chromatography
- HSA:
-
Human serum albumin
- iNOS:
-
Inducible nitric oxide synthase
- IR:
-
Infrared spectroscopy
- IUBMB:
-
Nomenclature Committee of the International Union of Biochemistry and Molecular Biology
- LC-CE-MS:
-
Liquid chromatography-capillary electrophoresis-mass spectrometry
- LC-ESI-MS:
-
Liquid chromatography coupled with electrospray ionization – mass spectrometry detector
- LC-HRMS:
-
Liquid chromatography coupled with high-resolution mass spectrometry detector
- LDL:
-
Low-density lipoprotein
- LPO:
-
Lipid peroxidation
- LUMO:
-
Lowest unoccupied molecular orbital
- MAE:
-
Microwave-assisted extraction
- MsCHI:
-
Chalcone isomerase from Medicago sativa
- MTT:
-
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- NADP+/NADPH:
-
Nicotinamide adenine dinucleotide phosphate/reduced form
- ObFOMT:
-
Ocimum basilicum L. flavonoid O-methyltransferase
- OMT:
-
O-methyltransferase
- ORAC:
-
Oxygen radical absorbance capacity
- PcFNS I:
-
Flavone synthase I from Petroselinum crispum
- pE-AmUGT10:
-
pET gene + uridine diphosphate-dependent glycosyltransferase specific for UDP-glucuronic acid from Antirrhinum majus
- PhCHS:
-
Chalcone synthase from Petunia X hybrid
- PLA:
-
Poly(lactide)
- PLE:
-
Pressurized liquid extraction
- QE:
-
Quercetin equivalent
- rpm:
-
Revolutions per minute
- RSC:
-
Radical scavenging capacity
- SARS-CoV-2:
-
Severe acute respiratory syndrome coronavirus 2
- SbFNS II:
-
Flavone synthase II from Scutellaria baicalensis
- SbF6H:
-
Flavone 6-hydroxylase from S. baicalensis
- SEM:
-
Scanning electron microscopy
- SET-PT:
-
Single electron transfer-proton transfer
- SPE:
-
Solid-phase extraction
- SPLET:
-
Sequential proton loss electron transfer
- SPME:
-
Solid-phase microextraction
- SOD:
-
Superoxide dismutase
- TaOMT2:
-
Triticum aestivum L. O-methyltransferase (recombinant)
- TBARS:
-
Thiobarbituric acid reactive substances
- TcCGT:
-
Trollius chinensis C-glycosyltransferase
- TEM:
-
Transmission electron microscopy
- TLC:
-
Thin layer chromatography
- TPC:
-
Total phenolic content
- TRP:
-
Total reducing power
- UAE:
-
Ultrasound-assisted extraction
- UAPLE:
-
Ultrasound-assisted pressurized liquid extraction
- UDP-Glu:
-
Uridine diphosphate glucose
- UDP-GT:
-
Uridine diphosphate glucuronotransferase
- UHPLC-MS/MS:
-
Ultrahigh-pressure liquid chromatography coupled with tandem mass spectrometry detector
- UPLC-PDA-ESI/QTOF-MS/MS2:
-
Ultrahigh-pressure liquid chromatography coupled with photodiode array detector and electrospray ionization/quadrupole time-of-flight-mass spectrometry/tandem mass spectrometry detector
- UPLC-QE-HRMS:
-
Ultrahigh-performance liquid chromatography-high-resolution mass spectrometry detector
- UV-Vis:
-
Ultraviolet-visible spectrophotometry
- XRD:
-
X-ray diffractometry
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Hădărugă, DI., Hădărugă, NG. (2023). Flavones. In: Jafari, S.M., Rashidinejad, A., Simal-Gandara, J. (eds) Handbook of Food Bioactive Ingredients. Springer, Cham. https://doi.org/10.1007/978-3-030-81404-5_4-1
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