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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F11%3A00358482" target="_blank" >RIV/60077344:_____/11:00358482 - isvavai.cz</a>
Alternative codes found
RIV/67985858:_____/11:00358482 RIV/60076658:12220/11:43881932 RIV/60461373:22330/11:43892755
Result on the web
<a href="http://dx.doi.org/10.1021/jf104195k" target="_blank" >http://dx.doi.org/10.1021/jf104195k</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/jf104195k" target="_blank" >10.1021/jf104195k</a>

Result language
angličtina
Original language name
Allium discoloration: the precursor and formation of the red pigment in giant onion (Allium giganteum Regel) and some other subgenus Melanocrommyum species
Original language description
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).
Czech name
—
Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CE - Biochemistry
OECD FORD branch
—

Project
<a href="/en/project/IAA400720706" target="_blank" >IAA400720706: Structure of silyl moieties through J(29Si-13C) couplings as determined by triple {1H, 13C}29Si NMR experiments</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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