Table 1.

Retention time (Rt), wavelengths of maximum absorption in the visible region (λ_max), mass spectral data and tentative identification of phenolic compounds in selected four drought-tolerant leafy vegetables amaranth.

Peak no	Rt (min)	λmax (nm)	Molecular ion [M − H]− (m/z)	MS2 (m/z)	Identity of tentative compounds
1	9.24	254	169.1224	169.1426	3,4,5 Trihydroxybenzoic acid
2	30.13	254	167.1121	167.1254	4-Hydroxy-3-methoxybenzoic acid
3	34.57	254	197.1231	197.1192	3,5-Dimethoxy-4-hydroxybenzoic acid
4	31.34	254	137.0224	137.1474	4-Hydroxybenzoic acid
5	48.23	254	137.2131	137.1832	2-Hydroxybenzoic acid
6	52.48	254	301.1432	301.0845	2,3,7,8-Tetrahydroxy-chromeno [5,4,3-cde] chromene-5,10-dione
7	2.33	280	154.1342	154.1256	3,4-Dihydroxybenzoic acid
8	4.28	280	154.1124	154.0256	2,4-Dihydroxybenzoic acid
9	3.82	280	154.1314	154.1258	2,5-Dihydroxybenzoic acid
10	32.12	280	179.0764	179.0875	3,4-Dihydroxy-trans-cinnamate
11	31.13	280	353.1426	353.1652	3-(3,4-Dihydroxy cinnamoyl) quinic acid
12	42.21	280	163.0584	163.1443	4-Hydroxy cinnamic acid
13	47.88	280	193.1691	193.1543	3-Methoxy-4-hydroxy cinnamic acid
14	49.59	280	163.2458	163.1273	3-Hydroxy cinnamic acid
15	49.03	280	223.1624	223.1642	4-Hydroxy-3,5-dimethoxy cinnamic acid
16	67.26	280	147.1214	147.1213	3-Phenyl acrylic acid
17	23.87	280	290.2387	290.1433	(2R-3S)-2-(3,4-dihydroxyphenyl)-3,4-dihydro-2-chromene-3,5,7-triol
18	26.71	280	271.0574	271.1248	Naringenin
19	54.33	360	463.2778	463.3234	Quercetin-3-O-glucoside
20	53.29	360	463.4435	463.5314	Quercetin-3-O-galactoside
21	53.14	360	609.2824	609.4123	Quercetin-3-O-rutinoside
22	7.54	370	301.1253	301.2138	2-(3,4-dihydroxy phenyl)-3,5,7-trihydroxychromene-4-one
23	4.58	370	626.3142	626.1362	Myricetin-3-O-rutinoside
24	15.55	370	270.2418	270.1317	4′,5,7-Trihydroxyflavone, 5,7-Dihydroxy-2-(4-hydroxyphenyl)-4-benzopyrone
25	17.77	370	593.4324	593.2847	kaempferol-3-O-rutinoside