By A. Andreatti, W. Stoll
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Additional info for Analytic and Algebraic Dependence of Meromorphic Fns
The simplest extraction method is manual extraction, where food samples are allowed to sit in solvent for varying periods of time with or without shaking, then filtered, and the solvent Analysis of Lipid and Protein Oxidation Chapter | 1 19 is evaporated from the lipid residue. Manual extraction works best with foods in which the lipids are mostly coated or adsorbed on the surface or are distributed in the food matrix without complexation, entrapment, or binding; it is much less effective in removing lipids from complex matrices.
Acids and alkalies both contain high levels of metal contaminants, particularly iron and copper, which rapidly initiate lipid oxidation and also transform 20 Oxidative Stability and Shelf Life of Foods Containing Oils and Fats existing products. Thus, if hydrolysis cannot be avoided for particular food products, ultrapure reagents such as Baker Ultrex™ must be used. , 1951, 1957) and its Bligh–Dyer simplified version (Bligh and Dyer, 1959) have become universally accepted (almost required) methods for lipid extractions of tissues for biological and medical research.
L Research on mechanisms requires more detailed product analysis over longer time periods from initial to extended oxidation, whereas strategies to assess effects of processing or antioxidants on stability must follow changes rapidly, and quality control analyses are more often conducted as isolated analyses on samples with unknown extent of oxidation. Now add to these issues new information indicating that lipid oxidation pathways and formation of lipid oxidation products may not follow the sequence that has dictated most oxidation analyses in current use (Schaich, 2005) but have addition, internal rearrangement, scission, and other reactions that compete with the well-known hydrogen abstractions.