Oxidative stability and alpha-tocopherol retention in soybean oil with lemon seed extract (Citrus limon) under thermoxidation.
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.
Luzia
Débora Maria Moreno
DM
Department of Food Engeneering and Technology, São Paulo State University, São José do Rio Preto, Brazil 15054-000. deboramaria_moreno@yahoo.com.br
Jorge
Neuza
N
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*
D000975:Antioxidants; D006873:Hydroquinones; D010936:Plant Extracts; D014810:Vitamin E; D013024:Soybean Oil; C018855:2-tert-butylhydroquinone