Počet záznamů: 1

Allium discoloration: the precursor and formation of the red pigment in giant onion (Allium giganteum Regel) and some other subgenus Melanocrommyum species

  1. 1.
    0358482 - BC-A 2012 RIV US eng J - Článek v odborném periodiku
    Kučerová, P. - Kubec, R. - Šimek, Petr - Václavík, P. - Schraml, Jan
    Allium discoloration: the precursor and formation of the red pigment in giant onion (Allium giganteum Regel) and some other subgenus Melanocrommyum species.
    Journal of Agricultural and Food Chemistry. Roč. 59, č. 5 (2011), s. 1821-1828 ISSN 0021-8561
    Grant CEP: GA AV ČR IAA400720706
    Grant ostatní: Grantová agentura Jihočeské univerzity(CZ) 067/2010/7
    Výzkumný záměr: CEZ:AV0Z50070508; CEZ:AV0Z40720504
    Klíčová slova: S-(2-pyrrolyl)cysteine S-oxide * S-(3-pyrrolyl)cysteine S-oxide * giant onion
    Kód oboru RIV: CE - Biochemie
    Impakt faktor: 2.823, rok: 2011

    The precursor of the orange-red pigment formed upon wounding the bulbs of Allium giganteum (Allium subg. Mclanocrommyum) was isolated and shown to be S-(2-pyrroly)cysteine S-oxide. In addition, two other pyrrolylsulfinyl derivatives were found in an extract from the bulbs, namely, 3-(2-pyrrolylsulfinyl)lactic acid and S-(3-pyrrolyl)c-ysteine S-oxide. Contrary to a previous report, the latter compound was shown not to serve as the precursor of the pigment, being in fact only an artifact formed du:ring isolation. The formation of pyrrolyl-containing compounds following disruption of A. giganteum bulbs was studied by a combination of LC-MS, LC-NMR and DART-MS. It was found that S-(2-pyrroly)cysteine S-oxide is cleaved by a C-S lyase (alliinase) to yield 2-pyrrolesulfenic acid. Two molecules of the latter compound give rise to highly reactive S-(2-pyrrolyl) 2-pyrrolethiosulfinate which in turn converts into red 2,2'-epidithio-3,3'-dipyrrole (dipyrrolo[2,3-d:2',3'-e]-1,2-dithiin).
    Trvalý link: http://hdl.handle.net/11104/0196511