TABLE 2

Binding of barbituric acid homologs (mean %, ± S.E., n = 3) to the Centrifree ultrafiltration sample reservoir, membrane, collection cup, and in total from protein-free media

n-Pentyln-Hexyln-Heptyln-Octyln-Nonyl
Total2.8 (±0.84)4.1 (±2.4)7.3 (±0.76)22.9 (±2.4)54.5 (±14)
ReservoirNTNTNT6.3 (±2.8)20.3 (±1.8)
MembraneaNTNTNT16.433.2
CupNSNSNS1.6 (±0.55)14.5 (±2.9)
  • NT, not tested as total binding <10%; NS, not significantly different from zero.

  • a Determined by difference from the mean values of binding to other surfaces (see supplemental data).