Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
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Secondary Ion Mass Spectrometry of Macromolecules Loading in Individual Polyelectrolyte Multilayer Microcapsules

Nikolai L. Yakovlev A , Maxim V. Kiryukhin A D , Maria N. Antipina A , Theo T. Susanto B , Sethuraman Ravi B , Murali Adithyavairavan B and Gleb B. Sukhorukov C

A Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 3 Research Link, 117602, Singapore.

B Raffles Institution, 1 Raffles Institution Lane, 575954, Singapore.

C School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK.

D Corresponding author. Email: kiryukhin-m@imre.a-star.edu.sg

Australian Journal of Chemistry 64(9) 1295-1298 https://doi.org/10.1071/CH11153
Submitted: 19 April 2011  Accepted: 19 May 2011   Published: 27 July 2011

Abstract

The control over the amount of a payload in polyelectrolyte multilayer microcapsules is of particular importance for several applications, such as transportation and delivery of drugs, enzymes, and other (bio)active materials. In this work, secondary ion mass spectrometry is applied to measure the content of peroxidase in individual capsules. The distribution of a payload among the capsules in a batch is analyzed for different loading routines. Absorption in porous CaCO3 demonstrates lower enzyme content with a standard deviation of 40 % on average. pH-Controlled post-loading gives two to three times higher content and a standard deviation of 20–25 %. The decrease of pH upon post-loading increases the encapsulation efficiency.


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