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Effect of moisture content on the invertase activity of freeze-dried S. cerevisiae.

Author(s) : PITOMBO R. N. M., SPRING C., PASSOS R. F., TONATO M., VITOLO M.

Type of article: Article

Summary

Once established under adequate freezing conditions the invertase activity remained unchanged after freeze-drying. Nevertheless, in some cases the cell-growing capability after freeze-drying diminished around 70%, mainly if the frozen cell suspension was attained through freezing carried out at cooling rate = 0.5 K/min. Freeze-dried yeast with water activity between 0 and 0.33 (about the monolayer moisture content value) maintained at 25 deg C for 235 days and at 89 deg C for 15 min retained at least 85% of its original invertase activity, whereas samples with water activity greater than monolayer moisture content lost at least 60% of its invertase activity.

Details

  • Original title: Effect of moisture content on the invertase activity of freeze-dried S. cerevisiae.
  • Record ID : 1995-3249
  • Languages: English
  • Source: Cryobiology - vol. 31 - n. 4
  • Publication date: 1994/08

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