FTIR spectra of dried product obtained as Nujol mulls. Products were those formed using NLB (thick line) or MPG (thin line) and show characteristic β-haematin peaks at 1662 cm-1 and 1210 cm-1 (arrows). Both products gave an identical infrared spectrum. Nujol peaks (★) and contaminating lipid peaks (*) are marked. Reaction conditions: 2.15 L/H ratio (64.3 μM total lipid), citric buffer (50 mM, pH 4.8), 37°C, 10 min incubation.