[1] Univ Western Cape, Dept Biotechnol, Dept Sci & Innovat, Fac Nat Sci,Mintek Nanotechnol Innovat Ctr, Bellville, South Africa
[2] Univ Cape Town, Dept Mol & Cell Biol, Cape Town, South Africa
[3] Univ Western Cape, Dept Biotechnol, Fac Nat Sci, Bellville, South Africa
[4] Univ Western Cape, Dept Biotechnol, Nanobiotechnol Res Grp, Fac Nat Sci, Bellville, South Africa