Preparation and characterization of protein isolate from Yellowfin tuna Thunnus albacares roe by isoelectric solubilization/precipitation process

Table 5 Mineral contents (mg/100 g of sample) of FDC, RAIs and RPIs prepared by ISP process and positive controls

Sample	FDC	RAI-11	RAI-12	RPI-1	RPI-2	RPI-3	RPI-4	Casein	Hb
Moisture (%)	4.3	6.5	10.1	4.7	3.4	2.3	5.0	4.0	2.0
K	1179.9 ± 8.3a	108.9 ± 3.9d	130.6 ± 0.6c	36.2 ± 1.7g	57.5 ± 1.3f	51.6 ± 1.7f	68.5 ± 4.9e	912.0 ± 12.3b	71.4 ± 3.0e
S	992.3 ± 92.6b	591.4 ± 33.4e	627.9 ± 40.9cde	609.2 ± 40.9de	715.7 ± 26.9c	664.1 ± 75.0cde	698.9 ± 73.9cd	1984.1 ± 3.2a	442.0 ± 46.2f
Na	376.2 ± 2.1b	213.0 ± 3.6e	303.3 ± 3.7c	78.2 ± 0.1h	123.7 ± 1.0g	188.0 ± 2.0f	244.4 ± 4.2d	706.3 ± 10.9a	212.6 ± 1.8e
P	257.7 ± 2.8a	84.3 ± 1.5f	97.1 ± 1.4e	254.6 ± 2.5a	246.8 ± 7.8b	235.7 ± 1.2c	215.3 ± 1.6d	34.7 ± 0.4g	29.1 ± 0.3h
Mg	66.8 ± 0.4a	23.4 ± 0.2d	51.7 ± 0.5b	6.6 ± 0.1f	32.3 ± 0.6c	4.6 ± 0.1g	21.4 ± 0.0e	-	-
Zn	45.0 ± 0.3b	42.8 ± 0.3c	44.4 ± 0.2b	23.2 ± 0.4d	52.1 ± 0.4a	23.0 ± 0.2d	52.6 ± 0.8a	-	-
Ca	33.5 ± 0.3b	39.4 ± 1.0b	37.2 ± 0.2b	7.8 ± 0.1d	15.3P ± 0.5cd	12.4 ± 0.1cd	16.5 ± 0.3cd	987.2 ± 17.3a	21.2 ± 0.2c
Fe	9.8 ± 0.1d	5.8 ± 0.1e	6.6 ± 0.1e	12.9 ± 0.3bc	11.9 ± 0.1c	13.5 ± 0.2b	13.2 ± 0.3b	4.8 ± 0.0f	250.1 ± 1.8a
Mn	0.1 ± 0.0c	0.1 ± 0.0c	0.0 ± 0.0d	−0.1 ± 0.0e	0.0 ± 0.0d	−0.1 ± 0.0e	0.0 ± 0.0d	4.0 ± 0.0a	0.4 ± 0.0b

FDC freeze-dried concentrate; RAI-11 and 12, roe alkaline insolubles after alkaline solubilization at pH 11 and 12, respectively; RPI-1, 2, 3 and 4, roe protein isolate adjusting at pH 4.5 and 5.5, respectively after alkaline solubilization at pH 11 and 12; Hb hemoglobin
Values are means ± standard deviation of triple determinations
Means with different letter within the same row are significantly different at P < 0.05 by Duncan’s multiple range test
-; not determined

ISSN: 2234-1757