1. Department of Microbial, Biochemical and Food Biotechnology; University of the Free State; Bloemfontein; South Africa
2. Department of Physics; University of the Free State; Bloemfontein; South Africa
3. Centre for Microscopy; University of the Free State; Bloemfontein; South Africa
4. Department of Chemistry; University of the Free State; Bloemfontein; South Africa
5. SABLtd Brewing Centre of Excellence; Alrode; South Africa