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Food Processing Engineering: Part 4
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Ascorbic Acid

Ashwin Balasubramanian
Studying B.Tech Mechanical Engineering Fourth year in Karunya University, Coimbatore.

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  2. Pyridoxine . Its formed from naturally occurring pyridine derivatives (pyridoxine , pyridoxal and pyridoxamine) Functions . It is co-factor for several enzymes connected with the metabolism of amino acids. It is having role in antibodies formation

  3. Sources Pulses, wheat and meat are rich sources . Other cereals are fair source Vegetables and fruits are relatively poor source RDA . For adult it would be 2.0 mg per day For infants 0.4 mg per day .Expected and nursing mother 2.5mg per day

  4. Deficiency . Anemia . Glossitis Cheeilosis .Seborrhic dermatitis


  6. Folic Acic Discovered in 1941,as growth factor for bacteria . Derivered from Latin word folium means leaf It was first isolated from spinach leaves and is widely distributed in green, leafy plant . Folic acid is pteroyl-mono-glutamic acid . It is quite soluble in slightly alkaline or acid solution but stable in neutral or alkaline solution specially in absence of air

  7. Function:s . Primary function is related to transfer of single carbon in the synthesis of a number of metabolites in the body It is also involved in the synthesis of nucleic acid along with B12 . Folic acid undergoes a series of metabolic conversions to its various coenzyme forms after it is absorbed

  8. Sources . Green leafy vegetables Liver Legumes . Yeast . Relatively stable but storage and cooking losses can be as high as 50% specially if cooking water is discarded

  9. RDA . 100 mcg per day for adult . 25 mcg in infant . 40 mcg for pre school stage . 300 mcg for pregnant women

  10. Deficiency . Prolonged deficiency leads to abnormal formation of red blood cells resulting in metabolic anemia

  11. Vitamin B12 . Discovered in 1948 . Contain cobalt and phosphorus and red in colour . Found in only in animal foods and higher plants are unable to synthesis it . It is considered as most potent vitamirn . Discovered through studies of pernicious anemia a condition that begins with a metabolastic anemia and leads to an irreversible degradation of central nervous system


  13. Ascorbic Acid This vitamin is white, crystalline, odorless compound radialy soluble in water It is strong reducing agent . Comparatively stable in an acid medium but destroyed by the action of heat oxygen and catalyst such as copper

  14. Function:s It is a part of the cementing material which hold the body cells firmly in place Thus it plays an important role to build and maintain strong tissue in general especially connective tissue . Blood vessel tissue depends on vitamin C to form strong capillary walls . It is important partner for protein synthesis

  15. Function:s . Naturally it is needed in growth stages of life . High conc. of Vit C found in metabolically active in tissues in body, indicating its importance in their function . That includes brain , liver, kidney, pancreas, adrenal glands, thymus and spleen . It helps to body to build resistance to infections

  16. Deficiency The cementing material is not formed in adequate amounts, tiny breaks occur in walls of very small blood vessels and haemorrhages joints become swollen and are painful . General weakness lack of appetite and thickened and scaly skin Spongy gums and haemorrhages in body tissue are other symptoms of scurvy these can be reversed by including ascorbic acid rich foods in diet