VITAMIN B2 - RIBOFLAVIN

Occurrence and structure

Riboflavin is also found in plant and animal products, especially in abundance milk and Dairy products. Its structure is characterized by a tricyclic (consisting of three rings) isoalloxazine ring to which a ribitol residue is attached. Furthermore, vitamin B2 is in: Broccoli, asparagus, spinach eggs and whole grain products contain.

function

It occurs in FMN (F.lavinM.ononucleotide) and FAD (F.lavinA.denin-D.inucleotide), which are important electron acceptors. This means that they can accept two protons (H +) and two electrons (e-), which are released in a reaction, as the reaction product no longer needs them. It looks like this: FAD à FADH2. This reaction is called a Hydrogenation (Adding hydrogen) and the resulting product are the reduction equivalents already mentioned above, which then supply energy in the respiratory chain. About 1.5 ATP Per FADH2. From that FAD and FMN participate in reactions in which they are hydrogenated, it can be concluded that they are cofactors of reactions in which starting materials (Raw materials) are dehydrated (i.e. electrons are withdrawn from them / hydrogen is withdrawn).For example, they can be found in the following reactions / metabolic pathways

Beta oxidation (Breakdown of fatty acids, helpers of acyl-CoA dehydrogenase)

oxidative / dehydrogenative deamination (Splitting off of amino groups)

Complex I of the respiratory chain (for the meaning of the respiratory chain, see above)

Overview of vitamins

Water-soluble (hydrophilic) vitamins: