The authors would like to acknowledge Jamie Gallant for technical assistance with scanning FT-MIR ATR samples. Furthermore, Drs Steven Pelly and Eugene van Rensburg are also thanked for their valuable insights. This work forms part of the Technology Innovation Agency (TIA) funded project PB110/08. Kim Trollope was supported by a grant from TIA and Stellenbosch University. She also holds a L’Oreal-UNESCO For Women in Science Regional Fellowship in Sub-Saharan Africa.
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