Biochemistry For Dummies, 2nd Edition by John T Moore

Author:John T Moore [Moore, John T]
Language: eng
Format: epub
Published: 2011-09-03T13:42:51+00:00

You can find many dietary sources for niacin, including most meats and vegetables, milk, cheese, and grains.

Vitamin B (pyridoxine)

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Vitamin B consists of three components: pyridoxine, pyridoxal, and pyridox-6

amine. All three need to be converted to pyridoxal phosphate, a form that’s biologically active in the organism. Figure 10-4 shows the structures for these compounds. Pyridoxal phosphate serves as a coenzyme in a variety of processes, including the interconversion of Α-keto acids and amino acids.

Avocados, chicken, fish, nuts, liver, and bananas are especially good food sources of vitamin B . Heating decreases its concentration in food. (But don’t 6

try eating raw chicken just for the increased B .)

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No pyridoxine-deficiency diseases are known, but low levels can lead to irri-tability, depression, and confusion. Unlike the other water-soluble vitamins, evidence shows that large doses of vitamin B may lead to health problems. The 6

symptoms of excess vitamin B consumption include irreversible nerve damage.

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