Due to the high affinity of C3b for OH SAM1 and consequently lower desorption of C3 into the eluate. In a study by Silin et al63 greater amounts of IgG were detected on CH3 SAMs compared to OH, COOH or NH2 SAMs contrary to the results presented herein. Interestingly, in the present work, bands for IgG were present in eluates from OH (Figure 2b, Table 3), COOH (Figure 2c, Table 3) or NH2 SAMs (Figu