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Chapter 3. Thiamin, riboflavin, niacin, vitamin B6, pantothenic acid and biotin |
 | | Specifically the Mg -coordinated TPP participates in the formation of a-ketols (e.g., among hexose and pentose phosphates) as catalysed by transketolase and in the oxidation of a-keto acids (e.g., pyruvate, a-ketoglutarate, and branched-chain a-keto acids) by dehydrogenase complexes (10, 11). |
 | | Indicators used to estimate thiamin requirements are urinary excretion, erythrocyte transketolase activity coefficient, erythrocyte thiamin, blood pyruvate and lactate, and neurologic changes. |
 | | The erythrocyte transketolase assay, in which an activity coefficient based on a TPP stimulation of the basal level is given, continues to be a main functional indicator (9), but some problems have been encountered. |
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