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Spray-drying of trypsin – Surface characterisation and activity preservation
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1999 (English)In: International Journal of Pharmaceutics, ISSN 0378-5173, E-ISSN 1873-3476, Vol. 188, 243-253 p.Article in journal (Refereed)
Abstract [en]

In the present study trypsin mixed with various carbohydrates, i.e. lactose, sucrose, mannitol, a-cyclodextrin and dextrin, was spray-dried in order to investigate the effects of spray-drying on this enzyme, with particular emphasis on the effects of interactions between trypsin and the surface formed during spray-drying. The protein was strongly over-represented at the surface of the powder particles, the surface coverage ranging from 10 to 65%, depending on the amount of trypsin in the solids (0.2-5%). This indicates that the protein adsorbs at the air/liquid interface of the spray-droplets, and that this surface is largely preserved also after drying. The surface concentration of protein in the spray-dried powders could be controlled by adding a surfactant to the mixture before drying, since the surfactant adsorbs preferentially at the air/liquid interface of the spray droplets, thus expelling protein from the surface. In general, the residual activity of trypsin in these non-optimised formulations was 90% or higher, and in no case less than 82%. It was found that the loss of activity could partly be explained by inactivation of the protein adsorbed at the surface. For mannitol and sucrose, however, the level of inactivation was higher than could be explained by surface inactivation alone, and additional mechanisms must also be considered.

Place, publisher, year, edition, pages
1999. Vol. 188, 243-253 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26588OAI: oai:DiVA.org:ri-26588DiVA: diva2:1053591
Note
A1281Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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