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. Author manuscript; available in PMC: 2011 Mar 2.

Published in final edited form as: Langmuir. 2010 Mar 2;26(5):3423–3432. doi: 10.1021/la902888y

Figure 6a shows the PCA scores plot of PC 2 vs. PC 1 for LKβ15 on carboxyl (C) and methyl (M) SAMs. Numbers in the legend represent the peptide concentration in mg/mL at which the peptides were adsorbed onto the SAMs. PC 1 separates samples with peptide from those without. PC 2 separates the samples with predominantly leucine side-chains nearest the surface from those with other groups close to the surface. Figure 6b shows loadings for PC 1 and Figure 6c shows the loadings for PC 2. L labels the major peaks generated by leucine, K labels major peaks from lysine, and “Both” labels peaks found in both peak lists.

Figure 6a shows the PCA scores plot of PC 2 vs. PC 1 for LKβ15 on carboxyl (C) and methyl (M) SAMs. Numbers in the legend represent the peptide concentration in mg/mL at which the peptides were adsorbed onto the SAMs. PC 1 separates samples with peptide from those without. PC 2 separates the samples with predominantly leucine side-chains nearest the surface from those with other groups close to the surface. Figure 6b shows loadings for PC 1 and Figure 6c shows the loadings for PC 2. L labels the major peaks generated by leucine, K labels major peaks from lysine, and “Both” labels peaks found in both peak lists.