title: Inhibition kinetics of lipid oxidation of model foods by using antioxidant extract of fermented soybeans.
abstract: Fermentation by using Aspergillus oryzae has been reported to increase antioxidant activity of soybeans significantly. The effectiveness of the extract from fermented soybeans was studied in 3 model foods with different complexities, i.e., linoleic acid emulsion, sunflower oil emulsions and bulk sunflower oil. For the emulsion systems, oxidation at two different pH values (4.5 and 7) was also compared. A reparameterised logistic equation was used to describe and to predict the experimental data. In general, a good agreement between experimental trends and simulated data from the model was found. A crude antioxidant extract (5 mg/g) showed a comparable antioxidant activity to 0.26 mg/g of butylated hydroxytoluene (BHT) in the linoleic acid emulsions. The extract exhibited a better capability to retard primary products in the linoleic acid systems than the secondary products. The opposite effect was observed in the bulk sunflower oil and its emulsion systems.
authors.affiliation: Department of Chemical Engineering, Diponegoro University, Jl. Prof. Sudharto, Kampus UNDIP Tembalang, Semarang 50275, Indonesia. dhwardhani@undip.ac.id
authors.forename: Dyah H
authors.initials: DH
authors.lastname: Wardhani
authors.forename: Pablo
authors.initials: P
authors.lastname: Fuciños
authors.forename: José A
authors.initials: JA
authors.lastname: Vázquez
authors.forename: Severino S
authors.initials: SS
authors.lastname: Pandiella
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification; D001230:Aspergillus / Q000378:metabolism*; D004655:Emulsions / Q000737:chemistry; D005503:Food Additives / Q000737:chemistry* / Q000302:isolation & purification; D007700:Kinetics; D019787:Linoleic Acid / Q000737:chemistry*; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification; D010938:Plant Oils / Q000737:chemistry*; D013025:Glycine max / Q000737:chemistry* / Q000378:metabolism* / Q000382:microbiology; D000074242:Sunflower Oil
chemical_list: D000975:Antioxidants; D004655:Emulsions; D005503:Food Additives; D010936:Plant Extracts; D010938:Plant Oils; D000074242:Sunflower Oil; D019787:Linoleic Acid