Kerkhof and faculty (AD 1995), methods for measuring ion. ร็ป. To measure the concentration of heparin in plasma of blood PBS solution and using ISFET type Ta2O3 immobilized with monolayer of protamine. เฮปา green is a polysaccharide with a negative charge is high. The clinical use to slow down the blood clotting. The protamine acts as a ligand of heparin, which ISFET will respond to the increase of the concentration, electrolyte The pressure changes the output for a moment. Which involved the charge density on the surface of the gate oxide ISFET after curing, ISFET in เลือดตัวอ grill with heparin for 2 minutes and transient response. ISFET to amplitude. With the linear relationship with the concentration of heparin. The heparin concentration during and 0.3 2.0 units / ml. In plasma of blood is measured with the accuracy can 0.08 units per milliliter.
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