Oxidative Stability of Soybean Triacylglycerol Using Carotenoids and Y-Tocopherol

Figures & data

TABLE 1 Physico-chemical parameters of refined oil and triacylglycerol of soybean (n = 3)

Parameters	Refined oil	Triacylglycerol
Moisture (%)	0.10 ± 0.02	0.10 ± 0.02
Specific gravity (20ºC)	0.92 ± 0.04	0.92 ± 0.05
Refractive index	1.47 ± 0.02	1.46 ± 0.01
Color value (30ºC)	17.7^a ± 0.6	2.4^b ± 0.2
Saponification value (mg KOH/g of oil)	183^a ± 1	192^b ± 1
Acid value (mg KOH/g of oil)	0.59^a ± 0.08	0.27^b ± 0.06
Wij’s iodine number (g I/100 g oil)	123^a ± 1	129^b ± 1
Peroxide value (meq O2/kg of oil)	2.3 ± 0.1	2.6 ± 0.1
Unsaponifiable matter (%)	1.19 ± 0.02	—
Free fatty acid (% oleic acid)	0.28^a ± 0.03	0.13^b ± 0.01

Data is mean of three analysis ± standard deviation;

Values with different superscript in rows are significantly (p < 0.05) different.

TABLE 2. Fatty acid profile of refined oil and triacylglycerol of soybean (n = 3)

Fatty acid	Refined oil	Triacylglycerol
Saturated fatty acid (%)	16.18	15.30
Myristic (C14:0)	0.02 ± 0	0.02 ± 0
Palmitic (C16:0)	11.1^a ± 0.1	10.03^b ± 0.02
Stearic (C18:0)	4.28 ± 0.04	4.45 ± 0.04
Arachidic (C20:0)	0.27 ± 0.01	0.25 ± 0.01
Behenic (C22:0)	0.41 ± 0.01	0.39 ± 0.02
Lignoceric acid (C24:0)	0.15 ± 0.01	0.16 ± 0.01
Monosaturated fatty acid (%)	23.44	19.41
Oleic (C18:1)	23.2^a ± 0.2	19.2^b ± 0.2
Docosanoic (C20:1)	0.24 ± 0.02	0.21 ± 0.01
Polyunsaturated fatty acids (%)	59.77	64.46
Linoleic (C18:2)	52.2^a ± 0.2	56.2^b ± 0.2

Data is mean of three analysis ± standard deviation;

Values with different superscript in rows are significantly (p < 0.05) different.

FIGURE 1 Effect of carotenoids and γ-tocopherol on (a) peroxide value (PV); (b) thiobarbituric acid reactive substances (TBARS); (c) conjugated diene (CD) in soybean triacylglycerol stored at 60ºC (n = 3).

FIGURE 2 Oxidative stability index (OSI) of soybean triacylglycerol treated with carotenoids and γ-tocopherol.