Comparative Evaluation of the Antioxidant Capacities, Organic Acids, and Volatiles of Papaya Juices Fermented by Lactobacillus acidophilus and Lactobacillus plantarum

Table 5

Major volatile compounds and relative peak area in papaya juices before and after 48 h fermentation.

Volatile compounds	RT	RI	Papaya juice	FPJA 48 h	FPJP 48 h
			PA × 10^6	PA × 10^6	PA × 10^6
Acids
Acetic acid	19.36	1444
Propanoic acid	21.81	1537		–	–
2-Methyl-propanoic acid	22.56	1567	–	–
Butanoic acid	23.94	1623
3-Methyl-Butanoic acid	24.97	1666	–
2-Methyl-Butanoic acid	25.00	1668	–	–
Hexanoic acid	28.93	1845		–	–
2-Ethyl-Hexanoic acid	31.15	1953			–
Octanoic acid	33.33	2063
Nonanoic acid	35.45	2174			–
n-Decanoic acid	37.44	2281		–	–
Alcohols
Ethanol	4.28	930
1-Propanol	7.11	1043	–
2-Methyl-1-propanol	9.14	1113	–	–
1-Butanol	10.71	1160	–
1-Penten-3-ol	11.14	1173
3-Methyl-1-butanol	12.66	1219
3-Methyl-3-buten-1-ol	13.84	1255	–	–
1-Pentanol	13.96	1259		–
Prenol	16.00	1325	–
3-Pentanol	16.43	1340	–
1-Hexanol	16.95	1357
1-Heptanol	19.77	1459
2-Ethyl-1-hexanol	20.69	1493		–	–
Linalool	22.04	1546
1-Octanol	22.39	1560
1-Nonanol	24.82	1660		–
1-Decanol	27.15	1762	–
Geraniol	28.94	1845	–	–
Benzyl alcohol	29.44	1869
Phenylethyl alcohol	30.20	1905	–
Nerolidol	32.83	2037	–	–
Aldehydes
Acetaldehyde	2.05	6956
Pentanal	5.19	970	–	–
Hexanal	8.29	1085	–	–
2-Methyl-2-heptenal	10.11	1142		–
Heptanal	11.66	1188	–	–
Octanal	14.93	1289	–	–
2,6-Dimethyl-5-heptenal	16.80	1352		–	–
Nonanal	17.96	1392
Benzaldehyde	21.24	1514
Dodecanal	25.90	1706	–
2,4-Dimethyl-benzaldehyde	28.02	1801	–
Esters
Acetic, methyl ester	2.74	820
Acetic, ethyl ester	3.38	881
Butanoic acid, methyl ester	5.41	979
Butanoic acid, ethyl ester	6.96	1038	–
Hexanoic acid, methyl ester	11.77	1191		–
Hexanoic acid, ethyl ester	13.31	1239	–		–
Thiocyanic acid, methyl ester	14.22	1267
Acetic acid, 2-ethylhexyl ester	17.75	1385
Octanoic acid, methyl ester	17.89	1390
Octanoic acid, ethyl ester	19.14	1436
n-Butyric acid 2-ethylhexyl ester	21.44	1522
Decanoic acid, methyl ester	23.23	1593
Decanoic acid, ethyl ester	24.27	1637
Hexanoic acid, 2-ethylhexyl ester	25.97	1709
Dodecanoic acid, methyl ester	27.98	1799
Dodecanoic acid, ethyl ester	28.88	1842
Tetradecanoic, methyl ester	32.28	2009			–
Myristoleate, methyl ester	33.02	2047		–	–
Tetradecanoic acid, ethyl ester	33.06	2049	–		–
Benzoic acid, 2-ethylhexyl ester	35.38	2171
Hexadecanoic acid, methyl ester	36.22	2216		–	–
Dodecanoic acid, ethyl ester	36.90	2252	–		–
9-Hexadecenoate, ethyl ester	37.37	2277			–
1,2-Benzenedicarboxylic acid, bis(2-methylpropyl) ester	41.66	2506	–
Dibutyl phthalate	44.09	2636	–
Ketones and lactones
Acetone	2.62	809
2-Butanone	3.55	897
2,3-Butanedione	5.16	968
2-Heptanone	11.61	1187	–	–
Acetoin	14.79	1285
1-Hydroxy-2-Propanone	15.15	1296	–	–
6-Methyl-5-Hepten-2-one	16.36	1337
2-Hydroxy-3-pentanone	16.91	1356	–
2-Nonanone	17.86	1389	–		–
3-(Hydroxymethyl)-2-Nonanone	17.92	1391
2-Octanone	23.30	1596
2-Dodecanone	28.12	1806	–		–
2-Tetradecanone	28.12	1806	–	–
Phenols
2,6-Bis(1,1-dimethylethyl)-4-(1-oxopropyl)phenol	30.52	1921	–
Phenol	31.98	1994	–
2,4-Di-tert-butylphenol	37.78	2299
2,6-Di-tert-butyl-4-methoxyphenol	46.52	2765		–	–

Values are expressed as the mean ± SD. Values with different letters (a ~ c) in the same row are significantly different at . RT, retention time; RI, retention index; PA, peak area; RPA, ratio of peak area; “–”, not detected.