電噴霧-質(zhì)譜研究A環(huán)不同取代基對黃酮類化合物裂解途徑的影響
摘 要:選擇槲皮素、葛根素、黃芩苷、朝藿定C和野黃芩苷為研究對象,在負(fù)離子檢測方式下,采用電噴霧-質(zhì)譜法(ESI-MS)研究A環(huán)不同取代基對自身裂解途徑的影響。結(jié)果發(fā)現(xiàn),該類化合物主要發(fā)生了脫糖、脫CO、脫水和RDA反應(yīng),進(jìn)一步分析發(fā)現(xiàn),A環(huán)上不同的取代基對自身質(zhì)譜裂解途經(jīng)影響較大,其裂解途徑有顯著差異,且H2O分子的丟失可以成為判斷A環(huán)取代基信息的一種方法。A環(huán)取代基不同黃酮類化合物的質(zhì)譜裂解規(guī)律有助于復(fù)雜黃酮類化合物的快速檢測和結(jié)構(gòu)解析。
關(guān)鍵詞:電噴霧-質(zhì)譜;黃酮類化合物;裂解特征;RDA裂解
中圖分類號:TQ406.7+2;TQ463+.24;O657.63;R927.2 文獻(xiàn)標(biāo)志碼:A 文章編號:1674-5124(2013)05-0059-03
Study on different substituents in A-ring effect on fragmentation pathway of
flavonoids using electrospray ion trap mass spectrometry
LIN Hong-ying1, HUANG Jian-mei1, DUAN Tian-xuan1, TAN Peng1, LIU Yong-gang1, LI Jiang-ning2
(1. Beijing University of Chinese Medicine,Beijing 100102,China;
2. Beijing Drug Administration,Beijing 100053,China)
Abstract: Under negative ion mode, electrospray ionization mass spectrometry (ESI-MS) was used to study on different substituents in A-ring effect on fragmentation pathway of flavonoids. During the fragmentation, RDA cleavage was detected and CO and H2O were usually lost during the fragmentation. Different substituents in A-ring affected fragmentation obviously, and among them, the loss of H2O molecular could be a marker to judge the substituent in A-ring. The results will be helpful in identifying the structures of flavonoids rapidly with the method of mass spectrometry.
Key words: ESI-MS; flavonoids; fragmentation; RDA cleavage