Quality of monosex tilapia under ice storage: Gutting effects on the formation of biogenic amines, biochemical, and microbiological characteristics

Figures & data

Table 1. Changes in pH, TVBN (mg%), and K value (%) of whole and gutted samples of monosex tilapia during iced storage.

	pH		TVBN (mg %)		K value (%)
Days	Whole	Gutted	Whole	Gutted	Whole	Gutted
0	6.34 ± 0.01^a	6.34 ± 0.01^a	12.6 ± 0^a	12.6 ± 0^a	0.54 ± 0^a	0.54 ± 0^a
3	6.44 ± 0^c	6.35 ± 0.02^a	15.06 ± 0.35^b	15.4 ± 0^b	14.03 ± 3.31^b	8.68 ± 1.43^b
6	6.51 ± 0.01^e	6.42 ± 0.02^b	15.72 ± 0.37^c	16.78 ± 0^d	24.65 ± 2.94^c	19.28 ± 1.17^c
9	6.58 ± 0^f	6.53 ± 0.01^d	16.06 ± 0^c	16.38 ± 0.34^c	50.99 ± 0.08^d	29.82 ± 1.73^d
12	6.41 ± 0.02^b	6.54 ± 0.01^de	19.17 ± 0.34^d	18.2 ± 0^e	50.07 ± 0^d	57.21 ± 0.09^e
15	6.51 ± 0.01^e	6.56 ± 0^e	19.17 ± 0.34^d	18.2 ± 0^e	75.45 ± 0.05^e	56.15 ± 0.34^e
18	6.49 ± 0.01^d	6.47 ± 0.01^c	19.5 ± 0^d	18.8 ± 0^f	80.69 ± 0^f	75.70 ± 0.91^f
21	6.48 ± 0.01^d	6.78 ± 0.02^g	19.52 ± 0^d	19.56 ± 0^g	81.09 ± 0.34^f	96.14 ± 0.25^g
24	6.67 ± 0.02^g	6.62 ± 0^f	19.56 ± 0^d	21 ± 0^h	90.89 ± 1.4^g	94.45 ± 1.66^g

Values are indicated as mean ± standard error with n = 3 and values in the column with different superscripts are significantly different between samples (p < 0.05).

Figure 1. Changes in APC, total coliform bacteria and H₂S producing bacteria of A: whole and B: gutted monosex tilapia during iced storage.

Table 2. Changes in biogenic amines of whole samples of monosex tilapia during iced storage.

Days of chilled storage	PUT	CAD	HIM	AGM	TRM	SPD	SPM
0	0^a	0	0	0	0	0^a	10.88 ± 1.5^de
3	0^a	0	0	0	0	1.39 ± 0.01^bc	8 ± 2.7^abc
6	0^a	0	0	0	0	1.91 ± 0.01^ab	9.58 ± 0.8^bcd
9	0^a	0	0	0	0	0.39 ± 0.1^ab	7.23 ± 0.9^a
12	0^a	0	0	0	0	0.89 ± 0.3^ab	12.53 ± 1.12^e
15	0^a	0	0	0	0	2.12 ± 0.3^c	16.05 ± 1.05^f
18	0^a	0	0	0	0	0.56 ± 0^ab	10.15 ± 0.8^cd
21	0.0069 ± 0.01^b	0	0	0	0	0.23 ± 0^a	7.6 ± 0.3^ab
24	0^a	0	0	0	0	2.03 ± 1^c	15.83 ± 0.7^f

Values are given in ppm and indicated as mean ± standard error with n = 3 and values in the column with different superscripts are significantly different between samples (p < 0.05).

Table 3. Changes in biogenic amines of gutted samples of monosex tilapia during iced storage.

Days of chilled storage	PUT	CAD	HIM	AGM	TRM	SPD	SPM
0	0^a	0^a	0	0^a	0	0^a	10.88 ± 1.5^ab
3	0^a	1.52 ± 0.1^b	0	0^a	0	0.28 ± 0.02^ab	9.7 ± 2.3^a
6	0^a	0^a	0	0^a	0	1.04 ± 0.45^c	11.4 ± 3.9^ab
9	0^a	0.39 ± 0^ab	0	0^a	0	0.9 ± 0.07^bc	14.75 ± 2.5^b
12	0^a	0^a	0	0^a	0	0.84 ± 0.08^bc	11.5 ± 2^ab
15	0^a	0.37 ± 0^ab	0	0^a	0	0.49 ± 0.1^abc	25.08 ± 0.9^c
18	0^a	0^a	0	0^a	0	0.51 ± 0.04^abc	13.13 ± 4^ab
21	0.25 ± 0.02^ab	0^a	0	0^a	0	0.39 ± 0.01^abc	12.83 ± 1.1^ab
24	0.39 ± 0.03^b	4.66 ± 1.4^c	0	4.71 ± 2.4^b	0	1.71 ± 0.2^d	18.78 ± 1.9^bc

Values are given in ppm and indicated as mean ± standard error with n = 3 and values in the column with different superscripts are significantly different between samples (p < 0.05).

Figure 2. Changes in sensory characteristics of whole and gutted monosex tilapia during iced storage. Values are indicated as mean ± standard error with n = 3.