Table 2 Cytokinins (CKs) scanned for using liquid chromatography-positive electrospray ionization tandem mass spectrometry in Methylobacterium supernatants

Nucleotides (mono- di- and triphosphates; CK-NTs)

 trans-Zeatin nucleotide (tZNT)

[²H₃]DHZRMP

 cis-Zeatin nucleotide (cZNT)

 Dihydrozeatin nucleotide (DHZNT)

 Isopentenyladenine nucleotide (iPNT)

[²H₆]iPRMP

Ribosides (CK-RBs)

 trans-Zeatin riboside (tZR)

[²H₅]ZR

 cis-Zeatin riboside (cZR)

 Dihydrozeatin riboside (DHZR)

[²H₃]DHZR

 Isopentenyladenosine (iPR)

[²H₆]iPR

Free Bases (CK-FBs)

 trans-Zeatin (tZ)

[²H₅]Z

 cis-Zeatin (cZ)

 Dihydrozeatin (DHZ)

[²H₃]DHZ

 Isopentenyladenine (iP)

[²H₆]iP

Glucosides (CK-GLUCs)

 trans-Zeatin-O-glucoside (tZOG)

[²H₅]ZOG

 cis-Zeatin-O-glucoside (cZOG)

 Dihydrozeatin-O-glucoside (DHZOG)

[²H₇]DHZOG

 trans-Zeatin-O-glucoside riboside (tZROG)

[²H₅]ZROG

 cis-Zeatin-O-glucoside riboside (cZROG)

 Dihydrozeatin-O-glucoside riboside (DHZROG)

[²H₇]DHZROG

 trans-Zeatin-9-glucoside (tZ9G)

[²H₅]Z9G

 cis-Zeatin-9-glucoside (cZ9G)

 Dihydrozeatin-9-glucoside (DHZ9G)

[²H₅]DHZ9G

Methylthiols (2MeS-CKs)

 2-Methylthio-Zeatin (2MeSZ)^a

[²H₅]2MeStZ

 2-Methylthio-Zeatin riboside (2MeSZR)^a

[²H₅]2MeStZR

 2-Methylthio-N⁶-isopentenyladenine (2MeSiP)

[²H₆]2MeSiP

 2-Methylthio-N⁶-isopentenyladenosine (2MeSiPR)

[²H₆]2MeSiPR