Abstract
Nucleobase and nucleoside compounds exist widely in various organisms. An often occurring problem in the discovery of new bioactive compounds from natural products is reisolation of known nucleobase and nucleoside compounds. To resolve this problem, a capillary electrophoresis-high resolution mass spectrometry (CE-HR-MS) method providing both rapid separation and accurate mass full-scan MS data was developed for the first time to screen and dereplicate known nucleobase and nucleoside compounds in crude extracts of natural products. Instrumental parameters were optimized to obtain optimum conditions for CE separation and electrospray ionization-time-of-flight mass spectrometry (ESI-TOF/MS) detection. The proposed method was verified to be precise, reproducible, and sensitive. Using this method, known nucleobase and nucleoside compounds in different marine medicinal organisms including Syngnathus acus Linnaeus; Hippocampus japonicus Kaup and Anthopleura lanthogrammica Berkly were successfully observed and identified. This work demonstrates that CE-HR-MS combined with an accurate mass database may be used as a powerful tool for dereplicating known nucleobase and nucleoside compounds in different types of natural products. Rapid dereplication of known nucleobase and nucleoside compounds allows researchers to focus on other leads with greater potential to yield new substances.
Highlights
Natural products are historically and currently the most consistently successful source of drug leads.Natural product are likely to continue to be sources of new commercially viable drug leads because the chemical novelty associated with natural products is higher than that of any other source[1]
The first goal of the current study is to develop a capillary electrophoresis (CE)-electrospray interface (ESI)-TOF/MS method that can rapidly screen and identify known nucleobases and nucleosides in crude extracts of different natural products
According to the results described, CE-ESI-TOF/MS combined with accurate mass screening can meet requirements for the rapid screening and dereplication of known nucleobase and nucleoside compounds in different natural products
Summary
Natural products are historically and currently the most consistently successful source of drug leads.Natural product are likely to continue to be sources of new commercially viable drug leads because the chemical novelty associated with natural products is higher than that of any other source[1]. Natural products are historically and currently the most consistently successful source of drug leads. To expedite the discovery of new leads and avoid reisolation of previously known compounds, discriminating between known versus new compounds as early as possible is crucial [4]. This process, which is called “dereplication” [5,6,7], enables the efficient use of human and financial resources so that efforts can focus on the discovery of structurally novel compounds [8,9,10]
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