Table 1.

Structures, molecular masses and retention times of the microcystins (MCs) identified in Microcystis CAWBG11.

Microcystin		Mra (Da)	RT b (min)	X	Z	R	Reference(s)
MC-RRs	[Asp3] MC-RR (2)	1023.6	6.32	Arg	Arg	H	[29]
	MC-RR (3)	1037.6	6.45	Arg	Arg	CH3	[30,31,32]
MC-XRs	MC-YR (4)	1044.5	7.20	Tyr	Arg	CH3	[33]
	[Asp3] MC-LR (5)	980.5	7.32	Leu	Arg	H	[34,35]
	MC-LR (1)	994.5	7.35	Leu	Arg	CH3	[16,33]
	[Asp3] MC-FR (6)	1014.5	7.52	Phe	Arg	H	[36]
	MC-FR (7)	1028.5	7.54	Phe	Arg	CH3	[37]
	[Asp3] MC-WR (8)	1053.5	7.56	Trp	Arg	H	[36]
	MC-WR (9)	1067.5	7.60	Trp	Arg	CH3	[37]
MC-RZs	[Asp3] MC-RA (10)	938.5	7.80	Arg	Ala	H	This Study
	MC-RA (11)	952.5	7.84	Arg	Ala	CH3	[38,39]
	[Asp3] MC-RAba (12)	952.5	8.16	Arg	Aba	H	This Study
	MC-RAba (13)	966.5	8.18	Arg	Aba	CH3	[39]
	MC-RL (14)	994.5	8.35	Arg	Leu	CH3	[39]
MC-XAs	MC-YA (15)	959.5	9.01	Tyr	Ala	CH3	[33]
	[Asp3] MC-LA (16)	895.5	9.12	Leu	Ala	H	[40]
	MC-LA (17)	909.5	9.29	Leu	Ala	CH3	[41]
	[Asp3] MC-FA (18)	929.5	9.46	Phe	Ala	H	This Study
	MC-FA (19)	943.5	9.52	Phe	Ala	CH3	[42]
	[Asp3] MC-WA (20)	968.5	9.48	Trp	Ala	H	This Study
	MC-WA (21)	982.5	9.54	Trp	Ala	CH3	[42]
MC-XAbas	MC-LAba (22)	923.5	9.69	Leu	Aba	CH3	[40,43,44]
	MC-FAba (23)	957.5	9.97	Phe	Aba	CH3	This Study
	MC-WAba (24)	996.5	10.24	Trp	Aba	CH3	[28]
MC-XLs	MC-LL (25)	951.5	10.50	Leu	Leu	CH3	[45]
	MC-FL (26)	985.5	10.71	Phe	Leu	CH3	This Study
	MC-WL (27)	1024.5	10.77	Trp	Leu	CH3	[28]

^a Molecular masses are rounded to one decimal place; ^b RT = Retention time on a C₁₈ HPLC column as per Section 3.4.