EFFECT OF USING GUAVA AND GRAPE SEEDS EXTRACTS ON OXIDATIVE STABILITY OF BLENDED SUNFLOWER AND SOYBEAN OILS | ||||
| Zagazig Journal of Agricultural Research | ||||
| Article 16, Volume 44, Issue 3, May 2017, Page 1047-1060 PDF (474.5 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/zjar.2017.52304 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Talaat M.A. El-Kady  1; A. O. Toliba2; M. K. Abd El-Rahman1; S. M. Abo El-Maati2
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| 1Nat. Nut. Inst., Minist. Health, Cairo, Egypt | ||||
| 2Food Sci. Dept., Fac. Agric., Zagazig Univ., Egypt | ||||
| Abstract | ||||
| This study was performed to evaluate the effect of guava seeds (GVSE) and grape seeds (GRSE) extracts compared to butylated hydroxytoluene (BHT) on the antioxidant activity of blended sunflower and soybean oils (1:1 V/V), defined as BO at 70oC for 72 hrs. GVSE and GRSE were separately added to the blended oils at two different concentrations (200 and 500 ppm). Synthetic antioxidant BHT at ratio of 200 ppm was used as positive control with the blends oils. The oxidative assessments were Peroxide value, P- anisidine value, total oxidation value and thiobarbituric acid reactive substances were used for measuring the oxidative stability of these blended oils. Results showed that the highest level of GVSE and GRSE gave the best protection against primary and secondary oxidation of blended oil samples. The high efficiency of these extracts was observed as follows: 500 ppm GRSE ˃ 500 ppm GVSE ˃ 200 ppm BHT ˃ 200 ppm GRSE ˃ 200 ppm GVSE ˃ control. Therefore, some of food processing wastes could be used as natural antioxidant in edible oils manufacturing. | ||||
| Keywords | ||||
| Guava seeds; grape seeds; blended oils; sunflower oil; soybean oil; oxidative stability | ||||
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