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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Nanomedicine. 2013 Dec 10;10(4):871–878. doi: 10.1016/j.nano.2013.11.016

Table 1.

The DFS parameters for the force spectroscopy data calculated from the DFS plot in Fig. 3A. Here, xβ and koff are the potential barrier location and dissociation ratio, respectively. The lifetime was calculated by k−1off, and the standard deviation (SD) was calculated from five independent experiments for pH 7 and pH 2.7.

pH xβ (Å) (±SD) Koff (S−1) (±SD) Lifetime (s)
7 1.3 (±0.2) 3.1 (±1.7) 0.46 (±0.25)
2.7 3.6 (±0.5) 0.43 (±0.12) 2.5 (±0.7)