Valorization of Food Waste to Produce Eco-Friendly Means of Corrosion Protection and “Green” Synthesis of Nanoparticles

Table 5

LC-MS analysis results of the pomegranate peel extract.

RT^a (min)	Compound	RI^b	[M-H]^c	Percentage (%)
2.25	Butanoic acid 2-hydroxymethylestera^b	1361	—	3.1
2.91	Pyridine^a,b,c	1172	80	2.4
3.27	2, 3, 7, 8-Tetrahydroxy-chromeno[5 ,4, 3-cde]chromene-5, 10-dione (ellagic acid)^a,b,c	3292	300	7.8
4.01	1-Deoxy-2, 4-O,O-methylene-d-xylitol	—	—	1.2
4.45	Gallic acid^a,b,c	1943	169	5.9
5.01	3-(3, 4-Dihydroxyphenyl)-2-propenoic acid (caffeic acid)^a,b,c	2130	179	4.7
6.99	n-Heptyl acrylate^a,b,c	1489	—	2.1
7.45	Benzoyl bromide^a,b,c	—	—	1.4
7.77	1, 2-Di(2-furyl)-1, 2-ethanedione^a,b,c	—	—	1.1
8.00	Delphinidin 3, 5-diglucoside^a	—	—	8.8
8.42	(1S, 3R, 4R, 5R)-3-{[(2E)-3-(3, 4-Dihydroxyphenyl)prop-2-enoyl]oxy}-1, 4, 5-trihydroxycyclohexanecarboxylic acid (chlorogenic acid)^a,b,c	3098	353	7.5
10.92	2, 5-Furandicarboxaldehyde^a,b	2467	—	3.2
11.86	2-Furancarboxaldehyde 5-(hydroxymethyl)^a,b	2509	—	2.8
12.73	Valoneic acid dilactone^a	—	—	5.1
16.33	Catechin^a,b,c	2859	289	10.2
16.88	Epicatechin^a,b,c	2836	289	7.5
18.77	Rutin^a,c	—	465	2.2
24.11	Granatin A^a	—	—	6.5
25.16	Granatin B^a	—	—	6.9

^aRT: retention time; STD: standard compound; NIST 14 (compound identified by RI comparison with library). ^bRI: Kovats retention indices (RI) determined using a commercial hydrocarbon mixture (C9–C25) on the HP-5MS column (compound identified by Kovats retention indices comparison with literature values). ^cMS: compound identified by mass spectra comparison with the Wiley library.