Microwave-assisted enzyme-catalyzed reactions in various solvent systems

Shan Shan Lin, Chi Hong Wu, Mei Chuan Sun, Chung-Ming Sun, Yen Peng Ho*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

91 Scopus citations


The work describes the accelerated enzymatic digestion of several proteins in various solvent systems under microwave irradiation. The tryptic fragments of the proteins were analyzed by matrix-assisted laser desorption/ionization mass spectrometry. Under the influence of rapid microwave heating, these enzymatic reactions can proceed in a solvent such as chloroform, which, under traditional digestion conditions, renders the enzyme inactive. The digestion efficiencies and sequence coverages were increased when the trypsin digestions occurred in acetonitrile-, methanol- and chloroform-containing solutions that were heated under microwave irradiation for 10 min using a commercial microwave applicator. The percentage of the protein digested under microwave irradiation increased with the relative acetonitrile content, but decreased as the methanol content was increased. These observations suggest that acetonitrile does not deactivate the enzyme during the irradiation period; in contrast, methanol does deactivate it. In all cases, the digestion efficiencies under microwave irradiation exceed those under conventional conditions.

Original languageEnglish
Pages (from-to)581-588
Number of pages8
JournalJournal of the American Society for Mass Spectrometry
Issue number4
StatePublished - 1 Apr 2005

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