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- W2060860270 abstract "Abstract Skim milk was adjusted to pH values between 6.5 and 7.1 and heated at 90 °C for times from 0 to 30 min. After heat treatment, the samples were re-adjusted to the natural pH (pH 6.67) and allowed to re-equilibrate. High levels of denatured whey proteins associated with the casein micelles during heating at pH 6.5 (about 70–80% of the total after 30 min of heating). This level decreased as the pH at heating was increased, so that about 30%, 20% and 10% of the denatured whey protein was associated with the casein micelles after 30 min of heating at pH 6.7, 6.9 and 7.1, respectively. Increasing levels of κ-casein were transferred to the serum as the pH at heating was increased. The loss of κ-casein and the formation of para-κ-casein with time as a consequence of the chymosin treatment of the milk samples were monitored by sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE). The loss of κ-casein and the formation of para-κ-casein were similar for the unheated and heated samples, regardless of the pH at heating or the heat treatment applied. Monitoring the gelation properties with time for the chymosin-treated milk samples indicated that the heat treatment of the milk markedly increased the gelation time and decreased the firmness ( G ′ ) of the gels formed, regardless of whether the denatured whey proteins were associated with the casein micelles or in the milk serum. There was no effect of pH at heat treatment. These results suggest that the heat treatment of milk has only a small effect on the primary stage of the chymosin reaction (enzymatic phase). However, heat treatment has a marked effect on the secondary stage of this reaction (aggregation phase), and the effect is similar regardless of whether the denatured whey proteins are associated with the casein micelles or in the milk serum as nonsedimentable aggregates." @default.
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- W2060860270 date "2007-01-01" @default.
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- W2060860270 title "Effect of pH at heat treatment on the hydrolysis of κ-casein and the gelation of skim milk by chymosin" @default.
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- W2060860270 doi "https://doi.org/10.1016/j.lwt.2005.08.002" @default.
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