ُExtension of induction period of some vegetable Oils by using natural plant extract (NPE) And refined rice bran oil NAHED M . M ATTA

Abstract:
To avoid use of the synthectic additives, the natural plant extract (NPE) of rosemary and sage leaves and also refined rice bran Oil (as a source of natural antioxidant and high stability oil ) were added to sunflower , soybean and blended oils to extend the induction period (oxidative stability) and cause improvement of the quality of these oils .
• The results indicated that , the phenolic compounds in natural plant extract (methanolic extract) of rosemary and sage leaves fractionated and determinated by HPLC , that about 12 phenols were detected , vanilic , coffein , syringic , coumarin , protocatachoic , chrisin , cinnamic , ferrulic , norengenin , caffeic , galic and chlorogonic .
• Refined rice bran oil (RRBO) was found to be more stable towards oxidation (25.0 hr) and it contains high amount of total tocopherols (454.22 ppm) .
• The addition of NPEof rosemary and sage leaves and RRBO to the investigated oils caused remarkably the induction period (stability) and total tocopherols and reduced the peroxide value , acidity , trine at 232nm and triene at 268nm . of these oils .
• Rosemary extract was superior to that of sage extract increasing oils stability and quality .

Publication year 2010
Organization Name
serial title EGYPT .J . Agric . Res .,
Author(s) from ARC
Publication Type Journal
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