EFFECT OF SAGE (Sa/via officinalis) EXTRACTS ON THE STABILITY OF CORN OIL AND ITS TOCOPHEROLS CONTENT DURING HEATING PROCESS. | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 5, Volume 28, Issue 12, December 2003, Page 8521-8532 PDF (949.96 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2003.247785 | ||||
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| Author | ||||
| K. M. Taha, | ||||
| Dept. of Agrlc. Biochemistry, Fac. of Agrlc., Minufiya Univ. | ||||
| Abstract | ||||
| The activity of hexane- extract (H.E) and ethanol extract {E. E) of sage leaves as a natural antioxidant, in a comparison with butylated hdroxytoluene (BHT), as a synthetic one in reducing the oxidative changes during intermittent heating of corn pil was studied. Changes in some constants. oxidized products, the fatty acids and tocopherols contents of corn oil free or containing hexane (H.E) and ethanol extract (E.E) of sage leaves and (BHT) as antioxidants were tested. Refractive index, acid value, peroxide value, total carbonyls and absorbance at 234. 270. 400 and 450 m increased progressively during the Intermittent heating process, while iodine value decreased. Addition of 0.1% of (E.E) and 0.05% (BHT) showed clear eHect in reducing these changes, whereas (H.E) was less effective. The addition of (E.E) and (BHT) reduced mao:edly the loss of linoleic acid after 10 hr of intermittent heating. y • tocopherol represented the major tocopherol fraction in corn oil, while 13- tocopherol was not detected. The losses of 0-, y-.'6- and total tocopherols were 70.9%, 50.6°(0. 20.3% and 53.9% respectively after 4 hr of intermittent heating of com oil without additiVes. (E.E) reduced lhese losses to 17.7%,4.5%.5.5% and 7.2% respectively for the same tocopherols mentioned above and under the same conditions comparing with BHT. which decreased lhese losses to 19.0%. 5.0%. 7.7% and 80% respectively, while H.E had less effect. So. (E. E) had nearly 50% of lhe efficiency f BHT as antioxidant. | ||||
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