Flavanone

Flavanones are a subclass of flavonoids found in citrus fruits, with hesperidin and naringenin being the most studied compounds. These polyphenolic compounds exhibit antioxidant and anti-inflammatory activities through modulation of cellular signaling pathways.

Origin & History

Flavanones are a subclass of flavonoids with a unique C6-C3-C6 carbon structure. They are primarily found in citrus fruits like grapefruit, lemon, lime, and orange, contributing to their bitter taste. They are biosynthesized in plants via the enzyme chalcone isomerase acting on chalcone precursors and are typically isolated as glycosides such as naringin or hesperidin through solvent-based extraction methods.

Historical & Cultural Context

The research dossier does not provide any information on the historical or traditional uses of flavanones.

Health Benefits

• No specific health benefits can be cited due to the lack of human clinical studies or meta-analyses for flavanones as a class.[1][2]

How It Works

Flavanones like hesperidin and naringenin modulate nuclear factor-kappa B (NF-κB) signaling pathways, reducing inflammatory cytokine production. They also activate Nrf2 transcription factor, enhancing antioxidant enzyme expression including glutathione peroxidase and catalase. These compounds can inhibit cyclooxygenase and lipoxygenase enzymes involved in inflammatory prostaglandin synthesis.

Scientific Research

The research dossier does not contain specific human clinical trials, RCTs, or meta-analyses on flavanones. No PubMed PMIDs are available to reference for this compound.

Clinical Summary

Currently, no human clinical studies or meta-analyses have specifically evaluated flavanones as a class for health outcomes. Most research on individual flavanones like hesperidin and naringenin consists of in vitro cell studies and animal models. The lack of controlled human trials prevents establishment of clinical efficacy or optimal dosing recommendations. Future clinical research is needed to validate the potential health benefits observed in preclinical studies.

Nutritional Profile

Flavanones are a class of polyphenolic bioactive compounds, not a macronutrient or micronutrient source in themselves. They are secondary plant metabolites with a characteristic C6-C3-C6 flavonoid skeleton featuring a saturated C2-C3 bond and a chiral center at C-2. As a compound class rather than a food, they carry no caloric value, fat, protein, fiber, vitamins, or minerals. Key representative flavanones include naringenin (found in grapefruit at ~25–50 mg per 100 mL juice), hesperetin (found in oranges at ~15–45 mg per 100 mL juice as its glycoside hesperidin), and eriodictyol (found in lemons and herbs). Typical dietary intake of total flavanones is estimated at 20–100 mg/day in Western diets, with citrus-consuming populations reaching higher levels. Bioavailability is notably limited and variable: flavanone glycosides (e.g., hesperidin, naringin) require gut microbial hydrolysis in the colon before absorption as aglycones, resulting in delayed absorption (peak plasma at 4–7 hours post-ingestion) and low overall bioavailability (generally <25% for hesperidin). Naringenin aglycone is absorbed more rapidly in the small intestine. Molecular weights range from approximately 272 g/mol (naringenin aglycone) to 610 g/mol (hesperidin glycoside). These compounds are primarily characterized by their antioxidant capacity in vitro (ORAC values vary by structure), though translation to in vivo human benefit remains unestablished in clinical trials.

Preparation & Dosage

No clinically studied dosage ranges or forms are available in the research. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Vitamin C, Quercetin, Rutin, Hesperidin, Naringin

Safety & Interactions

Flavanones from dietary sources are generally recognized as safe with no established adverse effects. Potential drug interactions may occur with medications metabolized by cytochrome P450 enzymes, as some flavanones can inhibit CYP3A4. High-dose supplementation safety profiles have not been established through clinical trials. Pregnant and breastfeeding women should consult healthcare providers before using flavanone supplements beyond normal dietary intake.