Which of the following vitamins is NOT water-soluble?
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Answer: A. Tocopherol
Explanation
Tocopherol is another name for Vitamin E, which is a fat-soluble vitamin stored in body tissues and liver. Unlike water-soluble nutrients that flush out rapidly, fat-soluble tocopherol accumulates in lipid membranes and fatty deposits. Its chemical structure allows it to dissolve efficiently in fats while remaining insoluble in aqueous bodily fluids. Tocopherols function as powerful biological antioxidants protecting cellular membranes from damaging reactive oxygen species. Dietary sources of Vitamin E include vegetable oils, nuts, seeds, and green leafy vegetables. Fat-soluble vitamins require normal lipid digestion and absorption mechanisms in the small intestine to enter circulation.
Option B is incorrect because pyridoxine is Vitamin B6, which is water-soluble and flushes out in urine. Option C is incorrect because pantothenic acid is Vitamin B5, classified as a water-soluble vitamin. Option D is incorrect because niacin is Vitamin B3, known for being soluble in water rather than fat.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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