Korean Membrane Journal

The Membrane Society of Korea (한국막학회)
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Improvement of ${\beta}-glucosidase$ Activity of Olea europaea Fruit Extracts Processed by Membrane Technology

  • Mazzei, R. (Institute on Membrane Technology, CNR-ITM C/o University of Calabria) ;
  • Giomo, L. (Institute on Membrane Technology, CNR-ITM C/o University of Calabria) ;
  • Spadafora, A. (Department of Ecology, University of Calabria) ;
  • Mazzuca, S. (Department of Ecology, University of Calabria) ;
  • Drioli, E. (Institute on Membrane Technology, CNR-ITM C/o University of Calabria)
  • Published : 2006.12.31
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Abstract

The ${\beta}-glucosidase$ from olive fruit is of particular interest compared to the ones from other sources because it has shown to have high specifity to convert the oleuropein into dialdehydes, which have antibacterial activity and are of high interest for their application in the food and pharmaceutical fields. The enzyme is not yet commercially available and advanced clean and safe technologies for its purification able to maintain the functional stability are foreseen. The purification of this protein from fruit extracts has been already tempted by electrophoresis but either enzyme deactivation or high background with unclear profiles occurred. In this work, fruit extracts obtained from the ripening stage that showed the highest enzyme activity have been processed by diafiltration and ultrafiltration. Asymmetric membranes made of polyamide or polysulphone having 50 and 30 kDa molecular weight cut-off, respectively, were tested for the diafiltration process. Ultrafiltration membranes made of polyethersulfone with 4 kDa molecular weight cut-off were used to concentrate the dia-filtered permeate solutions. The efficiency of the separation processes was evaluated byenzyme activity tests using the hydrolysis of p-D-nitrophenyl-${\beta}$-D-glucopyranoside (pNPGlc) as reaction model. Qualitative and quantitative electrophoresis were applied to analyze the composition of protein solution before and after the membrane separation; in addition dot blot and western blot analyses were applied to verify the presence of ${\beta}-glucosidase$ in the processed fractions. The overall results showed that the ${\beta}-glucosidase$ functional stability was preserved during the membrane operations and the removal of 20 kDa proteins allowed to increase the specific activity of the enzyme of about 52% compared to the one present in the initial fruit extract.

Keywords

References

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