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Purification, properties and comparison of invertase, exoinulinases and endoinulinases of Aspergillus ficuum

Summary

One invertase (Inv), five exoinulinases (Exo I; II; III; IV; V) and three endoinulinases (Endo I; II; III) were isolated from a commercial inulinase preparation derived from Aspergillus ficuum using ammonium sulfate precipitation, ion exchange chromatography on DEAE-Sephacel and DEAE-Trisacryl, gel filtration on Ultrogel and Fast Protein Liquid Chromatography on a Mono Q column. The invertase (Inv) had a molecular weight of 84000 and was much more active on sucrose than on inulin: the ratio of activity on inulin and sucrose (I/S ratio) was 0.01. The five exoinulinases show the same molecular weight of 74000 and I/S ratios in the range 0.16–0.36. The three endoinulinases had molecular weight of 64000 and I/S ratios in the range 0.86–2.92. All the β-fructofuranosidases were glycoproteins with a high sugar content (from 22 to 41% w/w). A. ficuum is the first described organism containing the three activities: invertase, exo and endoinulinase.

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Correspondence to Jacques C. Baratti.

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Ettalibi, M., Baratti, J.C. Purification, properties and comparison of invertase, exoinulinases and endoinulinases of Aspergillus ficuum . Appl Microbiol Biotechnol 26, 13–20 (1987). https://doi.org/10.1007/BF00282143

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Keywords

  • Precipitation
  • Sugar
  • Molecular Weight
  • Sucrose
  • Liquid Chromatography