The action of total flavones of Gynostemma pentaphyllum (Thunb) Mak (TFG) 60 mg/kg i.v. could prevent arrhythmias induced by drugs and myocardial ischemia were investigated. In anesthetized rats and guinea pigs. The r...The action of total flavones of Gynostemma pentaphyllum (Thunb) Mak (TFG) 60 mg/kg i.v. could prevent arrhythmias induced by drugs and myocardial ischemia were investigated. In anesthetized rats and guinea pigs. The results showed that in TFG group the duration of ventricular tachycardia (VT) induced by aconitine in rats was shortened (P<0 01) and the incidence of ventricular fibrillation (VF) and the mortality were decreased (P<0 01) respectively. The arrhythmias induced by i.v. BaCl 2 4 mg/kg in rats were immediately recovered to a normal sinus rhythm and VT induced by i.v. CaCl 2 130 mg/kg in rats was decreased by TFG i.v. TFG i.v. elevated the doses of i.v. strophanthin G to induce ectopic beats (EB), VT, VF and cardiac arrest (CA) in guinea pigs by 89%, 58%, 27%, and 28% (P<0 01) respectively. The incidence of VF induced by coronary artery ligation in rats was decreased (P<0 01), duration of EB, duraton of VT and VF decreased to 45%, 42% and 0% of the NS group respectively. The results suggest that TFG in dosage of 60 mg/kg might be useful for the prevention of VT and VF.展开更多
The standard molar reaction enthalpies of two reactions,CeCl_3·7H_2O(s)+3CCl_3COOH(s)=Ce(TCA)_3·3H_2O(s)+3HCl(g)+4H_2O(l) (1) and Ce(TCA)_3·3H_2O(s)+2C_9H_7NO(s)= Ce(TCA) (C_9H_6NO)_2 (s)+2CCl_3COOH(s)...The standard molar reaction enthalpies of two reactions,CeCl_3·7H_2O(s)+3CCl_3COOH(s)=Ce(TCA)_3·3H_2O(s)+3HCl(g)+4H_2O(l) (1) and Ce(TCA)_3·3H_2O(s)+2C_9H_7NO(s)= Ce(TCA) (C_9H_6NO)_2 (s)+2CCl_3COOH(s)+ 3H_2O(l) (2),were investigated by classical solution calorimetry and an isoperibol calorimeter at 298.15 K. The standard molar enthalpies Δ_sH _m of solution of CeCl_3·7H_2O(s),3CCl_3COOH(s),Ce(TCA)_3·3H_2O(s),Ce(TCA)_3·3H_2O(s),2C_9H_7NO(s),Ce^(TCA)(C_9H_6NO)_2(s) and 2CCl_3COOH(s) were determined to be (50.615±0.028),(23.431±0.027),(94.206±0.010),(54.151±0.020),(27.485±0.045),(106.392±0.060) and -(14.893±0.026) kJ/mol,respectively. The reaction enthalpies Δ_rH _m of reactions (1) and (2) were obtained to be (204.279±0.023) and -(9.863±0.041) kJ/mol,respectively. According to the above results and the data given in literature,through Hess' law,the standard molar enthalpies Δ_fH _m of formation of Ce(TCA)_3·3H_2O(s) and Ce(TCA)(C_9H_6NO)_2(s) were estimated to be -(3060.0 ±0.087) and -(1369.0±0.292) kJ/mol,respectively.展开更多
文摘The action of total flavones of Gynostemma pentaphyllum (Thunb) Mak (TFG) 60 mg/kg i.v. could prevent arrhythmias induced by drugs and myocardial ischemia were investigated. In anesthetized rats and guinea pigs. The results showed that in TFG group the duration of ventricular tachycardia (VT) induced by aconitine in rats was shortened (P<0 01) and the incidence of ventricular fibrillation (VF) and the mortality were decreased (P<0 01) respectively. The arrhythmias induced by i.v. BaCl 2 4 mg/kg in rats were immediately recovered to a normal sinus rhythm and VT induced by i.v. CaCl 2 130 mg/kg in rats was decreased by TFG i.v. TFG i.v. elevated the doses of i.v. strophanthin G to induce ectopic beats (EB), VT, VF and cardiac arrest (CA) in guinea pigs by 89%, 58%, 27%, and 28% (P<0 01) respectively. The incidence of VF induced by coronary artery ligation in rats was decreased (P<0 01), duration of EB, duraton of VT and VF decreased to 45%, 42% and 0% of the NS group respectively. The results suggest that TFG in dosage of 60 mg/kg might be useful for the prevention of VT and VF.
基金ProjectsupportedbytheHunanProvincialEducationalMinistryFoundationofChina (No .0 0C0 0 1)
文摘The standard molar reaction enthalpies of two reactions,CeCl_3·7H_2O(s)+3CCl_3COOH(s)=Ce(TCA)_3·3H_2O(s)+3HCl(g)+4H_2O(l) (1) and Ce(TCA)_3·3H_2O(s)+2C_9H_7NO(s)= Ce(TCA) (C_9H_6NO)_2 (s)+2CCl_3COOH(s)+ 3H_2O(l) (2),were investigated by classical solution calorimetry and an isoperibol calorimeter at 298.15 K. The standard molar enthalpies Δ_sH _m of solution of CeCl_3·7H_2O(s),3CCl_3COOH(s),Ce(TCA)_3·3H_2O(s),Ce(TCA)_3·3H_2O(s),2C_9H_7NO(s),Ce^(TCA)(C_9H_6NO)_2(s) and 2CCl_3COOH(s) were determined to be (50.615±0.028),(23.431±0.027),(94.206±0.010),(54.151±0.020),(27.485±0.045),(106.392±0.060) and -(14.893±0.026) kJ/mol,respectively. The reaction enthalpies Δ_rH _m of reactions (1) and (2) were obtained to be (204.279±0.023) and -(9.863±0.041) kJ/mol,respectively. According to the above results and the data given in literature,through Hess' law,the standard molar enthalpies Δ_fH _m of formation of Ce(TCA)_3·3H_2O(s) and Ce(TCA)(C_9H_6NO)_2(s) were estimated to be -(3060.0 ±0.087) and -(1369.0±0.292) kJ/mol,respectively.
