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วันศุกร์ที่ 28 สิงหาคม พ.ศ. 2552

Pyridoxine

Sources

In food, Vitamin B6 is usually bound to protein, pyridoxol being the prominent form in plants, and pyridoxal and pyridoxamine in animal products. Major dietary sources of pyridoxine include:
Chicken
Liver
Yeast Extract
Fish, particularly:
§ Tuna
§ Trout
§ Herring
§ Halibut
§ Salmon
Nuts
Whole grains
Very few fruit and vegetables:
Beans
Cauliflowers
Bananas
Raisins


Absorption and Transportation of Pyridoxine

The three forms of vitamin B6 are absorbed in the jejunum by a process that is non-saturable. PN is found in foods in the free form and as the glycoside which is absorbed directly or after hydrolysis by lumenal enzymes and/or microflora.


§ PL and PM require hydrolysis before absorption. All three forms are subsequently trapped by phosphorylation. Experiments in the rat suggest that PLP (pyridoxal phosphate) utilization might be affected by agents that raise gastric pH. Disorders of the small intestine, such as celiac disease reduce vitamin B6 status but there is little good evidence that alcohol reduces B6 absorption.

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