Antioxidant Activity and Volatile and Phenolic Profiles of Essential Oil and Different Extracts of Wild Mint (Mentha longifolia) from the Pakistani Flora

Table 2

Chemical composition of M. longifolia essential oil.

Components^b	RI^c	Molecular mass	% Composition^a	Mode of identification^d	Quality (%)^e
Monoterpene  hydrocarbons			(7.31)
𝛼-Pinene	939	136	0.76±0.06	RT, RI, MS	97
𝛽-Pinene	979	136	2.14±0.19	RT, RI, MS	96
Limonene	1029	136	1.80±0.19	RT, RI, MS	94
cis-𝛽-Ocimene	1037	136	1.98±0.11	RT, RI, MS	97
𝛿-Terpinene	1089	136	0.63±0.04	RI, MS	96
Oxygenated monoterpenes			(67.24)
1,8-Cineol	1031	154	2.00±0.17	RT, RI, MS	98
Linalool	1097	154	0.98±0.10	RT, RI, MS	98
Borneol	1169	154	5.96±0.44	RT, RI, MS	96
𝛼-Terpineol	1189	154	1.17±0.09	RT, RI, MS	98
Thymol	1290	150	2.85±0.20	RT, RI, MS	99
Piperitenone	1343	150	24.9±1.34	RT, RI, MS	97
Thymol acetate	1352	192	1.08±0.08	RI, MS	94
Piperitenone oxide	1370	166	28.3±1.6	RT, RI, MS	96
Sesquiterpene hydrocarbons			(17.19)
𝛼-Gurjunene	1410	204	1.11±0.18	RI, MS	96
𝛽-Caryophyllene	1421	204	5.94±0.32	RT, RI, MS	99
Germacrene D	1485	204	8.16±1.01	RT, RI, MS	99
Calamenene	1540	202	1.98 ± 0.17^d	RT, RI, MS	98
Oxygenated sesquiterpenes			(5.05)
cis-Jasmone	1393	164	1.13 ± 0.11^a	RT, RI, MS	96
Caryophyllene oxide	1583	220	3.92 ± 0^b	RT, RI, MS	97
Total			96.79

aValues are mean ± standard deviation of three samples of M. longifolia essential oil, analyzed individually in triplicate.
^bCompounds are listed in order of elution from a HP-5MS column; ^cretention indices relative to C₉–C₂₄  n-alkanes on the HP-5MS column; ^dmode of identifications; RT: identification based on retention time; RI: identification based on retention index; MS: identification based on comparison of MS data compared with those from the NIST02.L and WILEY7n.L mass spectral libraries; ^ematching percentage with the NIST02.L and WILEY7n.L mass spectral libraries.