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Analysis of cipadesin limonoids from Cipadessa cinerascens using electrospray ionization quadrupole time‐of‐flight tandem mass spectrometry and quantum chemical calculations by Zhi‐Jun Wu; Dong‐Ming Sun; Jian‐Zhong Chen; Xiao‐Zhen Chen; Dong‐Mei Fang; Na Li; Ping Cheng; Guo‐Lin Zhang is a Chemistry article available to read on EtoBox.
What is Analysis of cipadesin limonoids from Cipadessa cinerascens using electrospray ionization quadrupole time‐of‐flight tandem mass spectrometry and quantum chemical calculations about?
## RATIONALE Limonoids, a class of tetranortriterpenoids, exhibit various biological effects, such as insect antifeedant and growth regulating activities, antimicrobial activity, potent cell adhesion inhibitory effects, antimalarial activity, anticancer activities, and antioxidant activity. The potential application brings the need for reliable, fast and low‐cost analysis of this class of compounds. ## METHODS Six cipadesin limonoids (**1–6**), including a pairs of isomers, from leaves and barks of __Cipadessa cinerascens__ were investigated by electrospray ionization quadrupole time‐of‐flight tandem mass spectrometry (ESI‐QTOF‐MS/MS) in positive‐ion mode. Characteristic processes were further studied by theoretical calculations. ## RESULTS 1,3‐Hydrogen rearrangement might play a significant role in the cleavage of ‐O‐ bridge bond in ring B and further produces some characteristic ions. For [M + Na]^+^ precursor ions, the product ion at __m/z__ 133 might indicate the structure of ring A and the losses of CO~2~ and AcOH occur readily. Interestingly, the radical product ion at __m/z__ 460 from [M + Na]^+^ ions seems to be the characteristic ion for compound **1**. A deuterium‐labelin
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- Author
- Zhi‐Jun Wu; Dong‐Ming Sun; Jian‐Zhong Chen; Xiao‐Zhen Chen; Dong‐Mei Fang; Na Li; Ping Cheng; Guo‐Lin Zhang
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0951-4198)
- Published
- 2012
- Language
- EN
- Field
- Chemistry (Physical Sciences)