porphyrinogenn.
/ˌpɔːfᵻˈrɪnədʒ(ə)n/, U.S. /ˌpɔrfəˈrɪnəˌdʒɛn/, /ˌpɔrfəˈrɪnədʒ(ə)n/ Chemistry.
Any of a group of colourless compounds which are reduced derivatives of porphin (and metabolic precursors of porphyrins) in which the four pyrrole nuclei are linked by methylene groups, —CH2—.In quot. 1913 spec. the first such compound to be prepared.
ΘΚΠ
the world > life > biology > substance > pigment > [noun] > pigment derivatives
phaeophorbide1911
porphyrinogen1913
1913 Jrnl. Chem. Soc. 104 i. 409 A colourless, crystalline reduction product, C33H42O4N4, of high molecular weight is obtained. This is termed porphyrinogen in view of its ready conversion into a red product having the spectroscopic properties of porphyrin.
1938 Chem. Soc. Ann. Rep. 34 384 Until this work was carried out, only three crystalline leuco-compounds of porphyrins, or porphyrinogens, were known, and none of these was derived from chlorophyll.
1955 Endeavour 14 135/1 It is possible that the porphyrins are not on the direct line of biosynthesis but are produced by reversible side reactions from closely related precursors, possibly the more highly reduced porphyrinogens.
1989 Lancet 3 June 1264/2 In the porphyrias, the circulating tetrapyrrole is normally the reduced porphyrinogen and not the oxidised porphyrin.
This entry has been updated (OED Third Edition, December 2006; most recently modified version published online March 2022).
<
n.1913