Introduces isoprene (C5H8, 2-methyl-1,3-butadiene) as the building block of isoprenoid lipids, then sorts isoprenoids into terpenes, fat-soluble vitamins and steroids. Covers acyclic and cyclic terpenes with head-to-tail, head-to-head and tail-to-tail linkages, contrasts monocyclic and dicyclic terpenes, and describes carotenoids as tetraterpenes. Closes with the biological roles of vitamins A, E and K, including retinal in rhodopsin and tocopherol ring methyl patterns.
Topic 41 of 42 in the MU Sofia syllabus for Chemistry (Dental Medicine, Year 1). The free AceMed note covers it in 6 sections, about 596 words (4 min of reading), with 16 flashcards.
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Isoprene and isoprenoid lipids.
Isoprenoids
Acyclic and cyclic terpenes.
Comparison of Mono- vs. Dicyclic Terpenes:
Carotenoids.
Fat-soluble vitamins (A, E and K) - biological functions.
Isoprene and isoprenoid lipids.
Formula: C5H8
Structure: CH2=C(CH3)CH=CH2 (two double bonds, methyl group on second carbon)
Classification:
Five-carbon diene (five carbons, eight hydrogens)
2-methyl-1,3-butadiene (specific type of butadiene with methyl group placement)
Isoprene is a colorless, volatile liquid hydrocarbon.
It's a building block for many naturally occurring compounds called isoprenoids (e.g., natural rubber).
It's produced by plants and animals (including humans).
Isoprenoids
Group of lipids synthesized from five-carbon isoprene unit.
Subgroups of Isoprenoids:
1. Terpenes (Terpenoids)
Largest and most diverse group.
Found in essential oils.
Roles in plant defense, pigmentation, and signaling.
Widely used in perfumery, pharmaceuticals, and food additives.
2. Fat-Soluble Vitamins
Derived from isoprenoid compounds.
Examples: Vitamin A (retinol), Vitamin E (tocopherol), Vitamin K.
Essential for vision, antioxidant defense, and blood clotting.
3. Steroids
Characteristic structure with four fused rings.
Examples: Cholesterol, testosterone, estrogen, cortisol, bile acids.
Roles in cell membrane structure, hormone regulation, and metabolism.
Isoprenoids play crucial roles in various biological processes and are important targets in drug development and research.
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