Niacinas: Skirtumas tarp puslapio versijų

Vitaminas B₃ turi 3 formas ([[Vitameras|vitamerus]]): niacinas [[nikotino rūgštis]], [[nikotinamidas]] ir [[nikotinamido ribozidas]].<ref name=Sti2013>{{cite book |last1=Stipanuk |first1=Martha H. |last2=Caudill |first2=Marie A. |title=Biochemical, Physiological, and Molecular Aspects of Human Nutrition - E-Book |date=2013 |publisher=Elsevier Health Sciences |isbn=9780323266956 |page=541 |url=https://books.google.com/books?id=XVNPAQAAQBAJ&pg=PA541 |language=en |quote=Vitamin B3... potentially includes three different molecular forms: nicotinic acid, niacinamide, and nicotinamide riboside}}</ref> Visos šios formos žmogaus kūne paverčiamos į nikotinamido adenino dinukleotidą (NAD).<ref name=Sti2013/> NAD būtinas gyvybei ir žmogus pats negali jo pasigaminti savo organizme be vitamino B3B₃ ar [[triptofanas|triptofano]].<ref name=Sti2013/> Nikotinamido ribozidas kaip B₃ atmaina buvo identifikuotas tik 2004 m.<ref name="Bieganowski & Brenner, Cell 2004: discovery of NR as an NAD precursor">{{cite journal |last1=Bieganowski |first1=P |last2=Brenner |first2=C |title=Discoveries of nicotinamide riboside as a nutrient and conserved NRK genes establish a Preiss-Handler independent route to NAD+ in fungi and humans. |journal=Cell |date=May 14, 2004 |volume=117 |issue=4 |pages=495–502 |doi=10.1016/s0092-8674(04)00416-7 |pmid=15137942|doi-access=free }}</ref><ref name=Sti2013/>