Latest revision as of 14:17, 21 February 2025

Flavonoid[edit]

Structure of flavonoids

Flavonoids are a class of polyphenolic compounds found in many plants. They are known for their diverse beneficial biological activities in humans and are a significant part of the human diet.

Structure[edit]

Flavonoids are characterized by their 15-carbon skeleton, which consists of two phenyl rings (A and B) and a heterocyclic ring (C). This structure can be abbreviated as C6-C3-C6.

File:Flavone skeleton colored.svg

Flavone skeleton

The basic structure of flavonoids can be modified in various ways, leading to different subclasses such as flavones, flavonols, isoflavones, and others.

Subclasses[edit]

Flavones[edit]

File:Flavone skeleton colored.svg

Flavone structure

Flavones are characterized by a double bond between C2 and C3 and a ketone at C4. They are commonly found in parsley, celery, and chamomile.

Flavonols[edit]

File:Flavonol skeleton colored.svg

Flavonol structure

Flavonols have a hydroxyl group at C3 in addition to the structure of flavones. They are abundant in onions, kale, and broccoli.

Isoflavones[edit]

File:Isoflavan.svg

Isoflavone structure

Isoflavones have a different arrangement of the B ring, which is attached at C3 of the C ring. They are primarily found in soybeans and other legumes.

Flavanones[edit]

Flavanones are similar to flavones but lack the double bond between C2 and C3. They are found in citrus fruits like oranges and grapefruits.

Anthocyanins[edit]

Anthocyanins are pigments responsible for the red, purple, and blue colors in many fruits and vegetables. They are water-soluble and found in berries, grapes, and red cabbage.

Chalcones[edit]

Chalcones are open-chain flavonoids that serve as precursors to other flavonoid classes. They are found in licorice and hops.

Biological Functions[edit]

Flavonoids are known for their antioxidant properties, which help in neutralizing free radicals and reducing oxidative stress. They also exhibit anti-inflammatory, antiviral, and anticancer activities.

Flavonoids can modulate cell signaling pathways and influence the activity of various enzymes. They are also involved in the regulation of gene expression.

Dietary Sources[edit]

Flavonoids are widely distributed in the plant kingdom and are present in a variety of foods and beverages. Common sources include:

Related Pages[edit]

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-'''Flavonoids''' are a class of [[polyphenolic compounds]] found in [[plants]], with a basic structure consisting of two aromatic rings bound together by three carbon atoms that form an oxygenated heterocycle. They are known for their diverse range of biological activities and play a significant role in plant coloration, growth, and defense. Flavonoids are also recognized for their health benefits in humans, including antioxidant, anti-inflammatory, and anti-carcinogenic properties.
+= Flavonoid =
-==Classification==
+[[File:Flavonoids.svg|thumb|right|Structure of flavonoids]]
-Flavonoids can be classified into several subclasses based on their chemical structure:
-* [[Flavones]]
-* [[Flavonols]]
-* [[Flavanones]]
-* [[Flavan-3-ols]] (or catechins)
-* [[Anthocyanins]]
-* [[Isoflavonoids]]
-Each subclass contains numerous compounds with varying degrees of biological activity and health benefits.
+'''Flavonoids''' are a class of [[polyphenolic]] compounds found in many [[plants]]. They are known for their diverse beneficial [[biological activities]] in humans and are a significant part of the [[human diet]].
-==Biosynthesis==
+== Structure ==
-The biosynthesis of flavonoids in plants involves several enzymatic steps, starting from the amino acid phenylalanine. The process is regulated by a complex network of genes and is influenced by environmental factors such as light, temperature, and pathogen exposure.
-==Functions in Plants==
+Flavonoids are characterized by their [[15-carbon]] skeleton, which consists of two [[phenyl]] rings (A and B) and a heterocyclic ring (C). This structure can be abbreviated as C6-C3-C6.
-In plants, flavonoids serve multiple functions:
-* They contribute to the pigmentation of flowers, fruits, and leaves, attracting pollinators and seed dispersers.
-* Flavonoids act as antioxidants, protecting plants from oxidative stress.
-* They play a role in plant defense against pathogens and herbivores.
-* Flavonoids are involved in the regulation of plant growth and development.
-==Health Benefits in Humans==
+[[File:Flavone_skeleton_colored.svg|thumb|left|Flavone skeleton]]
-Flavonoids are considered beneficial for human health due to their antioxidant properties, which help neutralize harmful free radicals in the body. Other health benefits include:
-* Reducing the risk of chronic diseases such as heart disease, diabetes, and cancer.
-* Anti-inflammatory effects that may help reduce the risk of certain chronic conditions.
-* Potential to improve brain health and protect against neurodegenerative diseases.
-==Dietary Sources==
+The basic structure of flavonoids can be modified in various ways, leading to different subclasses such as [[flavones]], [[flavonols]], [[isoflavones]], and others.
-Flavonoids are widely distributed in the plant-based diet, with rich sources including:
-* [[Fruits]] (e.g., berries, apples, and citrus fruits)
-* [[Vegetables]] (e.g., onions, kale, and broccoli)
-* [[Tea]], especially green tea
-* [[Wine]] and [[grape]]s
-* [[Cocoa]] and dark chocolate
-==Research and Considerations==
+== Subclasses ==
-While research supports the health benefits of flavonoids, it is important to consume them as part of a balanced diet. Excessive consumption of flavonoid-rich foods or supplements may have adverse effects. Further research is needed to fully understand the mechanisms behind the health benefits of flavonoids and to establish recommended dietary intakes.
-==See Also==
+=== Flavones ===
-* [[Polyphenols]]
-* [[Antioxidants]]
-* [[Phytochemicals]]
-[[Category:Biochemistry]]
+[[File:Flavone_skeleton_colored.svg|thumb|right|Flavone structure]]
-[[Category:Nutrition]]
-[[Category:Phytochemicals]]
-{{Nutrition-stub}}
+Flavones are characterized by a double bond between C2 and C3 and a ketone at C4. They are commonly found in [[parsley]], [[celery]], and [[chamomile]].
-{{Biochemistry-stub}}
+=== Flavonols ===
+[[File:Flavonol_skeleton_colored.svg|thumb|left|Flavonol structure]]
+Flavonols have a hydroxyl group at C3 in addition to the structure of flavones. They are abundant in [[onions]], [[kale]], and [[broccoli]].
+=== Isoflavones ===
+[[File:Isoflavan.svg|thumb|right|Isoflavone structure]]
+Isoflavones have a different arrangement of the B ring, which is attached at C3 of the C ring. They are primarily found in [[soybeans]] and other [[legumes]].
+=== Flavanones ===
+Flavanones are similar to flavones but lack the double bond between C2 and C3. They are found in [[citrus fruits]] like [[oranges]] and [[grapefruits]].
+=== Anthocyanins ===
+Anthocyanins are pigments responsible for the red, purple, and blue colors in many fruits and vegetables. They are water-soluble and found in [[berries]], [[grapes]], and [[red cabbage]].
+=== Chalcones ===
+Chalcones are open-chain flavonoids that serve as precursors to other flavonoid classes. They are found in [[licorice]] and [[hops]].
+== Biological Functions ==
+Flavonoids are known for their [[antioxidant]] properties, which help in neutralizing [[free radicals]] and reducing [[oxidative stress]]. They also exhibit [[anti-inflammatory]], [[antiviral]], and [[anticancer]] activities.
+[[File:Flavonoids_Biochemistry.png|thumb|left|Biochemical pathways of flavonoids]]
+Flavonoids can modulate [[cell signaling]] pathways and influence the activity of various [[enzymes]]. They are also involved in the regulation of [[gene expression]].
+== Dietary Sources ==
+Flavonoids are widely distributed in the plant kingdom and are present in a variety of foods and beverages. Common sources include:
+* [[Fruits]]: [[apples]], [[berries]], [[grapes]]
+* [[Vegetables]]: [[onions]], [[kale]], [[broccoli]]
+* [[Beverages]]: [[tea]], [[red wine]], [[citrus juices]]
+== Related Pages ==
+* [[Polyphenol]]
+* [[Antioxidant]]
+* [[Plant secondary metabolism]]
+[[Category:Flavonoids]]

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