Table 2.

Contact Activation of FXII by 30 minute Incubation with Hydrophilic and Hydrophobic procoagulants

FXII Lot	Procoagulant Designation # (n)	Advancing Contact Angle (θ, degrees)	${\tau }_n^o$ (dyne/cm)	Average FXIIa Solution Concentration (PEU/ml × 10−2, N = 7)	Average FXIIa Yield (%, N = 7)
1	1	109.42 ± 1.63	−23.92 ± 1.93	2.68 ± 0.60	1.22 ± 0.27
	2	106.30 ± 1.89	−20.19 ± 2.27	4.21 ± 0.89	1.91 ± 0.40
	3	96.73 ± 1.67	−8.4 ± 2.08	0.35 ± 0.10	0.16 ± 0.05
	4	85.13 ± 2.01	6.11 ± 2.51	0.24 ± 0.07	0.10 ± 0.03
	5	52.30 ± 1.57	44.01 ± 1.56	0.12 ± 0.04	0.06 ± 0.02
	5	42.30 ± 2.10	53.23 ± 1.77	0.29 ± 0.08	0.13 ± 0.04
	6	0.00	72	2.47 ± 0.55	1.12 ± 0.25
2	1	118.13 ± 1.75	−33.93 ± 1.94	1.91 ± 0.33	0.86 ± 0.15
	2	108.33 ± 2.50	−22.64 ± 2.99	0.84 ± 0.16	0.38 ± 0.07
	3	93.41 ± 1.55	−4.27 ± 1.94	0.49 ± 0.10	0.22 ± 0.04
	4	89.54 ± 2.55	0.58 ± 3.20	0.43 ± 0.09	0.20 ± 0.04
	5	58.01 ± 3.77	38.12 ± 4.01	0.25 ± 0.05	0.11 ± 0.02
	6	0.00	72	0.83 ± 0.16	0.37 ± 0.07

Notes: Procoagulant number n corresponds to listing in Table 1. Error in θ is standard deviation of the mean of N = 3 measurements. Error in ${\tau }_n^o$ calculated by propagation of error. Error in FXIIa concentration is standard deviation of N = 7 measurements with error in percent yield computed by propagation of error. Results obtained with plasma lots I and II.