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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Two types of radicals in whole milk powder. Effect of lactose crystallization, lipid oxidation, and browning reactions.

Whole milk powder was stored in closed vials at 60 degrees C to induce crystallization of lactose within a short time scale. After an induction period of 3-4 days simultaneous crystallization of lactose, increase of water activity, formation of browning products, and increase of radical content took place. Radicals detected before lactose crystallization were characterized by a narrow ESR spectrum (g = 2.006) and could be depleted by removal of oxygen and therefore were assigned to oxidation processes. Late-stage radicals present after crystallization of lactose gave much wider spectra (g = 2.0048) and were independent of oxygen availability and assigned to late-stage Maillard reaction products. The study indicates that the processes of lactose crystallization, browning, and formation of radical species (g = 2.0048) are strongly coupled, while lipid oxidation is less dependent on the other processes.[1]

References

  1. Two types of radicals in whole milk powder. Effect of lactose crystallization, lipid oxidation, and browning reactions. Thomsen, M.K., Lauridsen, L., Skibsted, L.H., Risbo, J. J. Agric. Food Chem. (2005) [Pubmed]
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