title: Oxidative stability and alpha-tocopherol retention in soybean oil with lemon seed extract (Citrus limon) under thermoxidation.
abstract: The synergistic effect of lemon seed extract with tert-butylhydroquinone (TBHQ) in soybean oil subjected to thermoxidation by Rancimat was investigated, and the influence of these antioxidants on a-tocopherol degradation in thermoxidized soybean oil. Control, LSE (2400 mg/kg Lemon Seed Extract), TBHQ (50 mg/kg), Mixture 1 (LSE + 50 mg/kg TBHQ) and Mixture 2 (LSE + 25 mg/kg TBHQ) were subjected to 180 degrees C for 20 h. Samples were taken at time 0, 5, 10, 15 and 20 h intervals and analysed for oxidative stability and alpha-tocopherol content. LSE and Mixtures 1 and 2 showed the capacity of retarding lipid oxidation when added to soya oil and also contributed to alpha-tocopherol retention in oil heated at high temperatures. However, Mixtures 1 and 2 added to the oil presented a greater antioxidant power, consequently proving the antioxidants synergistic effect.
authors.affiliation: Department of Food Engeneering and Technology, São Paulo State University, São José do Rio Preto, Brazil 15054-000. deboramaria_moreno@yahoo.com.br
authors.forename: Débora Maria Moreno
authors.initials: DM
authors.lastname: Luzia
authors.forename: Neuza
authors.initials: N
authors.lastname: Jorge
mesh_terms: D000975:Antioxidants / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D002957:Citrus / Q000737:chemistry*; D006358:Hot Temperature; D006873:Hydroquinones / Q000032:analysis; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000737:chemistry; D012639:Seeds / Q000737:chemistry; D013024:Soybean Oil / Q000737:chemistry*; D014810:Vitamin E / Q000032:analysis*
chemical_list: D000975:Antioxidants; D006873:Hydroquinones; D010936:Plant Extracts; D014810:Vitamin E; D013024:Soybean Oil; C018855:2-tert-butylhydroquinone