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.

File:Flavonoids Biochemistry.png

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[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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