Mass Spectra Analyses of Amides and Amide Dimers of Steviol, Isosteviol, and Steviolbioside

Table 2

LC/MS/MS/ESI determination of main fragmentation pathway for compounds 1–7.

Compds	Precursor ion mass [M+Na]^+		Product ion masses (intensity%)
	ESI+	ESI−
1	357.3		357.2(100), 342.6(3),
			299.5(2),224.6(2), 197.1(4)
2		317.3, 318.3	317.3(100), 273.2(63), 271.1(43),
			119.9(6), 109.0(8), 93.9(5)
3	665.4, 666.4		665.3(100),547.3(3), 507.3(5),
			363.3(2), 347.2(3), 151.0(21),
			104.9(12)
		641.4, 642.4,643.4	641.3(30),479.3(100), 461.3(10),
			371.4(2), 338.9(12), 317.2(78),
			118.9(18), 112.8(35), 100.8(90),
			58.9(60)
4p	807.5, 808.5		807.4(100), 687.7(4), 645.5(6),
			347.1(17), 251.3(3), 184.9(5)
		783.5, 785.4	783.4(46), 621.4(98), 603.4(7),
			459.4(100), 220.9(2), 112.7(3),
			100.8(5)
4q	916.6,917.6,		916.4(100), 796.7(3), 754.3(4)
			347.1(35), 185.0(5)
		892.5	892.6(100), 730.5(3), 568.5(5),
			161.0(50), 100.8(35)
4r	914.5,		914.5(100), 794.5(6), 752.4(18),
			347.1(28)
		890.5, 891.5	566.5(20), 161.0(35), 112.8(43),
			100.8(100), 70.9(33)
5a	1331.7,1332.7,1333.7		1331.7(100), 1169.7(20), 1007.2(35)
			998.1(5), 887.5(2), 619.1(4)
5b	1360.0, 1360.9,1361.9		1359.7(100), 1197.5(3), 1035.6(4)
		1335.8, 1336.8, 1337.8	1335.6(100), 1173.6(40),
			1011.5(21), 849.6(7), 687.5(100)
5c	1374.1, 1375.1,1376.1		1373.6(100), 1211.5(5), 1049.6(7)
	1349.6		1349.6(38), 1187.5(25),
			1025.7(20),
			863.7(6), 701,6(100), 412.1(23)
5d	1402.2,1403.11404.1		1401.7(100), 1239.7(15),
			1077.8(30), 915.6(22), 609.5(18)
		1377.9,1378.9,1379.9	1377.8(3), 1215.7(2),729.7(100),
			370.6(15),112.9(18),100.9(40)
6	683.5, 684.5		661.4(31), 643.5(10),344.4(12)
			273.2(48), 255.2(100)
7	683.6		683.5(100), 273.4(30), 255.0(20),
			177.0(30),