Question

Vitamin E is a mixture of tocopherols and tocotrienols, each one has following forms, _____.

• A. \(\alpha\)
• B. \(\alpha, \beta\)
• C. \(\alpha, \beta \text{ and } \gamma\)
• D. \(\alpha, \beta, \gamma, \text{ and } \delta\)

Hint:

Among all eight vitamer forms, \(\alpha\)-tocopherol has the highest biological activity and is the most abundant form maintained in human tissues and blood plasma.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Vitamin E is a group of fat-soluble compounds characterized by a chromanol ring structure attached to an isoprenoid side chain.
These molecules act as chain-breaking antioxidants that protect cell membranes from lipid peroxidation.

Step 2: Detailed Explation:
The term Vitamin E does not refer to a single compound but rather to a group of eight turally occurring vitamers.
This group is divided into two structural subfamilies based on the saturation of their side chain:
• Tocopherols: Possess a saturated phytyl side chain.
• Tocotrienols: Possess an unsaturated isoprenoid side chain with three double bonds. Each of these families exists in four distinct isomeric forms, desigted as: \[ \alpha\text{- (alpha), } \beta\text{- (beta), } \gamma\text{- (gamma), and } \delta\text{- (delta)} \] The differences among these isomers depend on the number and position of the methyl (\(-\text{CH}_3\)) groups attached to the chromanol ring.
Therefore, Vitamin E consists of a mixture of four tocopherols and four tocotrienols, each existing in \(\alpha, \beta, \gamma,\) and \(\delta\) forms.

Step 3: Fil Answer:
The correct option is (D).