OAD-TOF system

Oxygen Attachment Dissociation TOF-LCMS

The OAD-TOF system is a Q-TOF LCMS that realizes OAD (Oxygen Attachment Dissociation), Shimadzu’s proprietary fragmentation technology. It allows the analysis of the position of carbon-carbon double bonds in lipids and other organic compounds. Combined with the LCMS-9050, which boasts world-class high mass accuracy and fast polarity switching, it enables the creation of innovative applications.


Innovative fragmentation technology

The OAD-TOF system is equipped with an OAD RADICAL SOURCE I, which enables Oxygen Attachment Dissociation (OAD) analysis, an innovative fragmentation that utilizes Shimadzu’s proprietary radical reaction. It can measure fragment ions that cannot be obtained by conventional collision-induced dissociation (CID), where ions are fragmented by collision with an inert gas such as argon or nitrogen. The irradiating oxygen radicals specifically oxidize/dissociate double bonds between carbons, which is useful for structure estimation of organic compounds such as lipids. The technique can be applied to monovalent ions and negative ions, which have been difficult to fragment using radical reactions by electrons and anions, and provides completely new structural information.

What is OAD (oxygen attachment dissociation)

CID preferentially dissociates weak chemical bonds. In the case of lipids, CID can determine the basic structure of lipids and polar groups, and the carbon composition of side chains (number of carbons and double bonds). With OAD, on the other hand, oxygen radicals react specifically with the double bonds between carbons, causing dissociation. By measuring fragment ions specific to the double bond, the position of the double bond can be determined.

For further information about its features, visit Shimadzu Europe website.

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