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Table 1 Quantification of NH2 groups per area for different spacer molecules on cp-titanium and on TiO2 powder (amount per powder weight in [nmol/mg] in parenthesis)

From: Influence of spacer length on heparin coupling efficiency and fibrinogen adsorption of modified titanium surfaces

Substrate Number of primary NH2-groups per nm2
  APMS Diamino-APMS Triamino-APMS
cp-Ti disc 156 ± 16 162 ± 12 134 ± 22
TiO2 powder 20.0 ± 0.5 (84.9 ± 2.1) 18.7 ± 0.5 (78.7 ± 2.0) 17.0 ± 0.3 (71.3 ± 1.3)