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Immobilization of lipase from Mucor miehei and Rhizopus oryzae into mesoporous silica - The effect of varied particle size and morphology

Hanna Gustafsson (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Emma Johansson ; Albert Barrabino (Institutionen för kemi- och bioteknik) ; Magnus Odén ; Krister Holmberg (Institutionen för kemi- och bioteknik, Teknisk ytkemi)
Colloids and Surfaces B: Biointerfaces (0927-7765). Vol. 100 (2012), p. 22-30.
[Artikel, refereegranskad vetenskaplig]

Immobilization of enzymes usually improves the recyclability and stability and can sometimes also improve the activity compared to enzymes free in solution. Mesoporous silica is a widely studied material as host for immobilized enzymes because of its large internal surface area and tunable pores. It has previously been shown that the pore size is critical both for the loading capacity and for the enzymatic activity; however, less focus has been given to the influence of the particle size. In this work the effect of particle size and particle morphology on the immobilization of lipase from Mucor miehei and Rhizopus oryzae have been investigated. Three kinds of mesoporous silica, all with 9 nm pores but with varying particle size (1000 nm, 300 nm and 40 nm) have been synthesized and were used as host for the lipases. The two lipases, which have the same molecular size but widely different isoelectric points, were immobilized into the silica particles at varied pH values within the interval 5 to 8. The 300 nm particles were proven to be the most suitable carrier with respect to specific activity for both enzymes. The lipase from Mucor miehei was more than four times as active when immobilized at pH 8 compared to free in solution whereas the difference was less pronounced for the Rhizopus oryzae lipase.

Nyckelord: Mesoporous silica, immobilization, enzymes, lipase, biocatalysis, particle morphology



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Denna post skapades 2012-06-21. Senast ändrad 2016-04-22.
CPL Pubid: 159286

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
SuMo Biomaterials
Institutionen för kemi- och bioteknik (2005-2014)

Ämnesområden

Livsvetenskaper
Materialvetenskap
Nanovetenskap och nanoteknik
Yt- och kolloidkemi
Molekylärbiologi
Annan kemiteknik

Chalmers infrastruktur

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Enzyme immobilization in mesoporous silica