A new low molecular weight heparin (LMWH) and a conventional unfraction-ated heparin (H) were tested in rats for venous antithrombotic activity and bleeding tendency after intravenous administration. Both drugs showed antithrombotic activity, but LMWH at the low dosages tested (0.1 and 0.25 mg/kg) demonstrated significantly higher activity than H. In a rat bleeding time test (transection model) both heparins produced a prolonged bleeding time, but LMWH possessed significantly less potency than H at all the dosages tested. Ex vivo coagulation parameters (activated partial thromboplastin time and antiXa activity) were also evaluated: LMWH presented very low activity on the APTT test and a sustained antiXa activity, comparable to that of H.
Cyclohexylphenylessigsäure (I) reagiert als Di‐lithium‐Salz mit Aldehyden bzw. Aceton zu α‐Cyclohexylphenyl‐β‐hydroxy‐alkancarbonsäuren (IIa), die durch Chromatographic in die erythro‐ bzw. threo‐Diastereomeren und weiter mit Chinin in die optischen Isomeren getrennt werden können.
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