Evaluation of Plant Phenolic Metabolites as a Source of Alzheimer's Drug Leads

Table 1

Peak assignment, mass spectrometry detection parameters and tentative identification of compounds in aqueous alcohol stalks extract of Schotia brachypetala by LC-ESI(-ve)-MS.

Peak number	Identified compounds	𝑡𝑅 (min)	[M-H]^− (𝑚/𝑧)	Fragment ions (𝑚/𝑧)	Peak area %	References
Sb1	Daidzein	1.76	253	253	1.3	[13]
Sb2	Unidentified	12.2	495	253	2.5
Sb3	Procyanidin isomer B1/B2	15.79	577	425, 407	6.5	[14]
Sb4	Naringin	18.76	579	459, 271	5.2	[14]
Sb5	Procyanidin isomer B1/B2	23.77	577	425, 407	4.8	[14]
Sb6	Procyanidin dimer gallate	29.79	729	577	6.2	[3]
Sb7	Unidentified	38.84	497	441, 253	3.2
Sb8	Quercetin 3-O-glucoronide	42.07	477	301, 151	5.6	[15]
Sb9	Quercetin hexose gallic acid	46.82	615	463, 301	15.5	[16]
Sb10	Quercetin hexose gallic acid	47.63	615	463, 301	10	[16]
Sb11	Unidentified	48.82	463	298, 253	8.3
Sb12	Unidentified	50.8	495	239, 220	6.6
Sb13	Quercetin hexose-protocatechuic acid	52	599	463, 300	7.2	[17]
Sb14	Quercetin 3-O-rhamnoside	57.04	447	301	9.2	[18]
Sb15	Ellagic acid	64.64	301	257, 229	4.1	[18]