Phenolic Compound - Plant Physiology - Lecture Slides, Slides for Physiology. Biju Patnaik University of Technology, Rourkela


Description: These are the lecture slides of Plant Physiology. Key important points are: Phenolic Compound, Phenol Group, Hydroxyl Functional Group, Aromatic Ring, Biosynthesis of Phenolics, Shikimic Acid Pathway, Cinnamic Acid, Phenylalanine Ammonia Lyase, Types of Phenolics
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What’s a phenolic compound?
A secondary product that contains a phenol group
- a hydroxyl functional group on an aromatic ring.
Phenolics are a chemically diverse group: many
different properties and functions.
Biosynthesis of phenolics
Shikimic acid pathway is most common in plants. Converts simple
carbohydrates into aromatic amino acids. Not present in animals.
Most plant phenolics are derived from cinnamic acid
formed from phenylalanine by phenylalanine ammonia lyase
(PAL) enzyme.
PAL activity is inducible: fungal infection, low nutrient levels, high light
Major types of phenolics
1. Simple phenolics - e.g. coumarins
2. Lignin - 2nd most abundant compound in plants
3. Flavonoids - two aromatic rings, 2 pathways
anthocyanins, flavones/flavonols
4. Condensed tannins
polymerized flavonoids
5. Hydrolyzable tannins
made of phenolic acids and sugars
smaller molecules than condensed tannins
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