International Journal of Metals

Research Article

A Comparative Study of the Inhibitory Effect of Gum Exudates from Khaya senegalensis and Albizia ferruginea on the Corrosion of Mild Steel in Hydrochloric Acid Medium

Table 2

Summary of GC-MS results from peaks in AF gum spectrum.


Peak number	%	Compound	MF	MW	RT	MP	Fragmentation peaks

1	0.27	alpha-Bergamotene	C₁₅H₂₄	204	18.9	42	69 (40%), 77 (35%), 91 (100%), 107 (40%), 119 (90%), 133 (10%), 147 (5%), 161 (15%), 189 (5%), and 204 (5%)
2	0.65	Longicyclene	C₁₅H₂₄	204	19.5	57	27 (20%), 41 (60%), 55 (30%), 69 (25%), 79 (30%), 94 (100%), 105 (60%), 119 (50%), 133 (40%), 147 (35%), 161 (40%), 180 (30%), and 204 (35%)
3	9.15	1,4-Methanoazulene	C₁₅H₂₄	204	20.5	89	27 (35%), 41 (100%), 55 (55%), 67 (40%), 79 (70%), 91 (90%), 107 (70%), 119 (55%), 133 (10%), 149 (10%), 161 (5%), and 177 (5%)
4	1.25	Caryophyllene oxide	C₁₅H₂₄O	220	26.5	68	27 (25%), 41 (90%), 69 (45%), 81 (40%), 85 (100%), 109 (45%), 119 (45%), 137 (20%), 151 (10%), 161 (15%), 189 (35%), and 204 (40%)
5	0.66	1,4-Methanoazulene-9-ol	C₁₅H₂₆O	222	26.9	64	27 (10%), 41 (60%), 55 (40%), 69 (45%), 81 (30%), 85 (100%), 109 (45%), 119 (45%), 137 (20%), 151 (10%), 161 (15%), 189 (35%), and 204 (40%)
6	0.64	n-Hexadecanoic acid	C₁₆H₃₂O₂	256	31.7	72	27 (20%), 41 (80%), 43 (100%), 60 (90%), 73 (100%), 85 (25%), 98 (20%), 115 (15%), 129 (40%), 143 (5%), 157 (10%), 171 (10%), 185 (10%), 213 (20%), 227 (5%), and 256 (50%)
7	0.45	1-(p-Cumenyladamantane)	C₁₉H₂₆	254	32.5	128	39 (40%), 41 (85%), 67 (15%), 79 (35%), 91 (40%), 105 (20%), 115 (20%), 135 (40%), 145 (10%), 155 (50%), 169 (5%), 197 (20%), 211 (5%), 239 (60%), and 254 (50%)
8	1.38	18-Oxokauran-17-ylacetate	C₂₂H₃₄O₃	346	33.3	150	31 (5%), 41 (50%), 43 (100%), 67 (40%), 81 (50%), 91 (35%), 109 (30%), 123 (40%), 135 (10%), 149 (5%), 161 (5%), 187 (5%), 257 (5%), and 286 (10%)
9	1.27	Naphthalene	C₂₀H₃₂	272	33.9	132	27 (15%), 41 (80%), 55 (60%), 69 (55%), 81 (65%), 95 (55%), 105 (50%), 119 (40%), 137 (40%), 149 (20%), 161 (40%), 175 (20%), 187 (25%), 257 (100%), and 272 (40%)
10	11.97	Gamma-elemene	C₁₅H₂₄	204	34.5	196	28 (15%), 41 (100%), 53 (50%), 67 (60%), 79 (40%), 93 (80%), 107 (50%), 121 (90%), 133 (20%), 147 (10%), 161 (20%), 189 (10%), and 204 (5%)
11	14.77	1-Phenenathrenecarboxylic acid,1,2,3,4,4a,5,6,9,10,10a-decahydro-1,4a	C₂₀H₃₀O₂	302	34.9	203	41 (20%), 81 (15%), 91 (30%), 105 (35%), 117 (20%), 13 (35%), 149 (35%), 157 (20%), 171 (10%), 185 (25%), 197 (10%), 213 (35%), 241 (50%), 256 (35%), 287 (80%), and 302 (100%)
12	18.31	1-Phenenathrenecarboxylic acid,1,2,3,4,4a,5,6,9,10,10a-octahydro-1,4a-dimethyl-7-(1-methylethyl)-	C₂₀H₂₈O₂	300	35.1	198	41 (10%), 69 (5%), 81 (5%), 91 (10%), 105 (5%), 117 (10%), 129 (15%), 141 (20%), 155 (15%), 169 (10%), 183 (10%), 197 (30%), 211 (5%,) 225 (5%), 239 (90%), and 285 (100%)
13	39.24	Abietic acid, 1-phenenathrenecarboxylic acid	C₂₀H₃₀O₂	302	35.6	195	18 (10%), 41 (20%), 67 (10%), 81 (30%), 9 (35%), 105 (40%), 121 (20%), 136 (50%), 143 (20%), 157 (20%), 171 (10%), 185 (20%), 213 (30%), 241 (40%), and 259 (50%)