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Vitamins are organic compounds that cannot be synthesized in adequate quantities by humans and must be supplied by the diet. They are essential for many biochemical reactions and are needed in very small amounts.
Pro-vitamins are precursors of vitamins that are converted into vitamins inside the body. They play a crucial role in ensuring that the body has sufficient levels of essential vitamins.
Vitamins do not enter into tissue structures like proteins, nor do they undergo degradation to provide energy like carbohydrates and lipids. They serve specific biochemical roles instead.
Fat-soluble vitamins include vitamins K, D, E, and A. They are soluble in fat solvents, require bile salts for absorption, and can be stored in the body, particularly in the liver and adipose tissue.
Water-soluble vitamins include vitamin C and the B-complex group. They are soluble in water, are not typically stored in the body, and are readily excreted in urine, making deficiencies possible.
Pantothenic acid, also known as vitamin B5, is a cofactor involved in acyl and acetyl transfer reactions. It is primarily present in tissues as a coenzyme and is essential for the synthesis of coenzyme A.
Deficiency of Pantothenic acid can lead to symptoms such as fatigue, irritability, and digestive issues. It is rare due to its widespread availability in foods.
The active forms of Vitamin C include ascorbic acid and dehydroascorbic acid. These forms participate in various biochemical reactions, including antioxidant activity and collagen synthesis.
Vitamin C plays a crucial role as an antioxidant, protecting cells from damage by free radicals. It is also essential for the synthesis of collagen, which is important for skin, blood vessels, and connective tissues.
Vitamin C deficiency can lead to scurvy, characterized by symptoms such as fatigue, swollen gums, joint pain, and anemia. It occurs due to inadequate dietary intake.
B-complex vitamins are absorbed in the intestine and transported via the portal circulation. Their tissue stores are minimal, except for B12 and folate, which can be stored in the liver.
Toxic effects of B-complex vitamins are relatively uncommon because excessive intake of water-soluble vitamins is usually followed by rapid excretion in urine, preventing accumulation.
Pantothenic acid consists of β-alanine linked to pantoic acid. This structure is crucial for its function as a coenzyme in various metabolic processes.
Coenzymes, such as those derived from B-complex vitamins, assist enzymes in catalyzing biochemical reactions. They are essential for the proper functioning of metabolic pathways.
The B-complex vitamins include Thiamin (B1), Riboflavin (B2), Niacin (B3), Pantothenic acid (B5), Pyridoxine (B6), Biotin (B7), Cobalamins (B12), and Folic acid (B9).
B vitamins are often found in the same food sources, such as whole grains and liver. This commonality means that deficiencies of B vitamins frequently occur simultaneously rather than in isolation.
Coenzyme A is involved in the synthesis and oxidation of fatty acids, as well as the metabolism of carbohydrates and amino acids. It plays a critical role in energy production and biosynthetic pathways.
An apoenzyme is the protein component of an enzyme that, when combined with a coenzyme, forms a complete and active enzyme. This combination is essential for the enzyme's catalytic activity.
Excess water-soluble vitamins are typically excreted in urine, which helps prevent toxicity. The body regulates their levels by adjusting absorption and excretion based on dietary intake.
Vitamin B12 and folate act as coenzymes in the process of hematopoiesis, which is the formation of red blood cells. They are crucial for DNA synthesis and cell division in the bone marrow.
Most B vitamins are not stored in significant amounts in the body, leading to quick depletion during dietary restriction. However, B12 and folate can be stored in the liver for longer periods.