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  • Title: New quinolinone alkaloids from chestnut (Castanea crenata Sieb) honey.
    Author: Cho JY, Bae SH, Kim HK, Lee ML, Choi YS, Jin BR, Lee HJ, Jeong HY, Lee YG, Moon JH.
    Journal: J Agric Food Chem; 2015 Apr 08; 63(13):3587-92. PubMed ID: 25797069.
    Abstract:
    Two new quinolinone alkaloids and 13 known compounds were isolated from chestnut (Castanea crenata Sieb) honey. Two new compounds were determined to be 3-dihydro-spiro[2(1H),3'(1'H)-diquinoline]-3',4,4'-trione (spirodiquinolinone) and 3-(2'-piperidine)-kynurenic acid. In addition, 2,3-dihydropyrrolo[1,2-a]quinazolin-5(1H)-one was identified for the first time from nature. In addition, 2,3-dihydropyrrolo[1,2-a]quinazolin-5(1H)-one was newly identified from chestnut honey, although this compound has been synthesized before. The structures were determined by the NMR and electrospray ionization-mass spectroscopy (ESI-MS). Three compounds were qualified and quantitated in chestnut honey by selective multiple reaction monitoring (MRM) detection of LC-ESI-MS using the isolated compounds as external standards.
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