Table 5. Volatile compound for sample groups determined by PI and TBARS

Compounds (AU×10⁵)	HH	HL	LH	LL	SEM	p-value
Heptanol	5.72^a	5.85^a	4.38^b	4.59^b	0.24	^***
Hexanol	31.36^a	25.58^b	18.65^c	16.29^c	1.57	^***
Nonanol	0.65	1.76	2.21	1.16	0.53	ns
Octanol	5.63^b	5.75^b	6.30^ab	7.07^a	0.62	^*
1-Octen-3-ol	72.78	86.01	84.78	76.82	3.98	ns
Pentanol	38.99^a	34.28^b	27.99^c	26.86^c	1.83	^***
3-Pentenol	0.43	0.54	0.40	0.37	0.04	ns
2,3-Butanediol	0.23	0.36	0.02	0.06	0.10	ns
3-Methyl-1-butanol	18.49^a	19.64^a	8.47^b	7.15^c	1.27	^***
Benzeneethanol	5.95^a	1.80^b	1.82^b	1.33^b	0.60	^***
Ethanol	29.07^d	30.33^c	31.97^b	33.32^a	0.77	^***
Alcohol	209.30^a	211.90^a	186.70^b	175.02^c	6.00	^***
2,3,5,8-Tetramethyldecane	1.82	1.43	1.53	1.54	0.23	ns
Decane	7.56^a	7.20^a	5.99^b	5.92^b	0.21	^***
Dodecane	7.58^a	7.20^a	6.13^b	5.64^c	0.20	^***
Tetradecane	1.55^a	1.42^a	0.68^b	0.83^b	0.17	^*
Alkane	18.51^a	17.25^a	14.38^b	13.93^b	0.62	^***
2,3-Octanedione	2.45	2.56	2.51	2.00	0.25	ns
2-Heptanone	5.48^a	5.66^a	5.40^a	2.97^b	0.58	^**
2-Octanone	0.38	0.43	0.47	0.45	0.03	ns
2-Propanone	15.27^a	11.96^b	10.21^c	9.35^d	0.61	^***
3-Octanone	1.61	2.22	0.93	1.30	0.38	ns
3-Hydroxy-2-butanone	3.01^a	2.92^a	1.75^b	1.77^b	0.19	^***
Ketone	28.20^a	25.74^b	21.26^c	17.84^d	1.09	^***
Benzaldehyde	3.38^a	3.67^a	1.89^b	2.37^b	0.44	^*
Decanal	1.58	1.42	1.08	1.31	0.24	ns
Heptanal	8.55^c	10.32^b	10.17^b	12.03^a	0.61	^***
Hexanal	24.17^a	22.72^b	21.32^c	20.96^c	0.67	^**
Nonanal	33.39^b	32.28^b	38.84^a	38.55^a	1.77	^*
Octanal	9.15	9.72	10.18	9.84	0.32	ns
Aldehyde	80.22	80.12	83.48	85.06	1.91	ns
Total	336.24^a	335.01^a	305.82^b	291.85^c	7.06	^***

Different small letters within different sample groups were significantly different (p<0.05).
p<0.05;
p<0.01;
p<0.001.
PI, proteolytic index; TBARS, 2-thiobarbituric acid reactive substances; HH, PI and TBARS of high levels; HL, PI of high level and TBARS of low level; LH, PI of low level and TBARS of high level; LL, PI and TBARS of low levels; ns, no significance.