Mass Spectrometry

This product is used for the pretreatment of specimens to release homocysteine pathway-related metabolites (homocysteine, methionine, cysteine, riboflavin, pyridoxal 5-phosphate, 4-pyridoxic acid, folate, 5-methyltetrahydrofolate, methylmalonic acid, S-adenosylmethionine, and S-adenosylhomocysteine) from their bound forms, enabling subsequent detection using in vitro diagnostic reagents or analytical instruments.
In vivo, homocysteine (Hcy) is primarily metabolized through the remethylation pathway and the transsulfuration pathway. Both pathways involve multiple precursor substances, enzymes, and cofactors. Alterations in any of these factors may lead to abnormal homocysteine metabolism. For example, deficiency of B vitamins: Vitamins B2 and B12 participate in the folate cycle, and deficiency of either vitamin may impair folate metabolism and consequently affect Hcy metabolism. In addition, Vitamin B6 is an essential coenzyme in the transsulfuration pathway, catalyzing the conversion of Hcy to cystathionine. Deficiency of Vitamin B6 may also result in elevated Hcy levels. A high-methionine diet may likewise increase homocysteine levels, as methionine is demethylated to form homocysteine.