Supported modified singlemetal Nicatalysts and binarymetal NiPdcatalysts were prepared by a precipitation method using diatemite and alumina as carriers and trace reactive metals as auxiliarys.They were eval...Supported modified singlemetal Nicatalysts and binarymetal NiPdcatalysts were prepared by a precipitation method using diatemite and alumina as carriers and trace reactive metals as auxiliarys.They were evaluated for hydrogenation of palmilic acid under the same reaction conditions.The results show that the activity and the resisting saponification of two catalysts are superior to that of USA140 and USA110 catalysts under the evatuated condions.展开更多
In this paper, saponins were extracted from Northern Shaanxi＇ s big jujubes using organic solvent method and also the oxidation resistance of the extractives was analyzed. In the experiment, the crude extractives of ...In this paper, saponins were extracted from Northern Shaanxi＇ s big jujubes using organic solvent method and also the oxidation resistance of the extractives was analyzed. In the experiment, the crude extractives of the saponins from jujubes were obtained using ethyl alcohol soaking method and Soxhlet extraction method and also qualitatively tested using 3 color reactions, and the test result was positive; the oxidation resistance of jujube saponins was analyzed through DPPH, hydroxyl radical scavenging experiment and reducibility measurement, and the results showed that the capability of jujube saponins in DPPH free radical scavenging was enhanced along with the improvement of the to- be-test material concentration, so saponins played a significant role on hydroxyl radical scavenging and possessed certain reducibility. Northern Shaanxi＇ s big jujubes are rich in saponins and possess excellent antioxidant ability that will be enhanced along with the increase of saponins content. Thus, a basis is provided for the effective extension of the jujube industry chain.展开更多
In the present study, we aimed to explore the neuroprotective effect of dioscin, a natural steroid saponin, on transient focal cerebral ischemia induced by middle cerebral artery occlusion （MCAO） in mice and its rel...In the present study, we aimed to explore the neuroprotective effect of dioscin, a natural steroid saponin, on transient focal cerebral ischemia induced by middle cerebral artery occlusion （MCAO） in mice and its related mechanism, We observed that dioscin （1,5 mg/kg, intracerebroventricular injection 30 min before MCAO） dramatically reduced the cerebral infarct volume, leading to improved neurological symptoms and reduced death of neuron, astrocytes and microglia in the infarct region. The gliosis and the reduced expressions of SOD1 and SOD2 by MCAO in the hippocampal CA1 region were significantly elevated by 1.5 mg/kg dioscin administration. These findings suggested that pretreatment of dioscin had a neuroprotective effect on mice transient focal cerebral ischemia via inhibiting the gliosis and elevating the SOD levels.展开更多
文摘Supported modified singlemetal Nicatalysts and binarymetal NiPdcatalysts were prepared by a precipitation method using diatemite and alumina as carriers and trace reactive metals as auxiliarys.They were evaluated for hydrogenation of palmilic acid under the same reaction conditions.The results show that the activity and the resisting saponification of two catalysts are superior to that of USA140 and USA110 catalysts under the evatuated condions.
文摘In this paper, saponins were extracted from Northern Shaanxi＇ s big jujubes using organic solvent method and also the oxidation resistance of the extractives was analyzed. In the experiment, the crude extractives of the saponins from jujubes were obtained using ethyl alcohol soaking method and Soxhlet extraction method and also qualitatively tested using 3 color reactions, and the test result was positive; the oxidation resistance of jujube saponins was analyzed through DPPH, hydroxyl radical scavenging experiment and reducibility measurement, and the results showed that the capability of jujube saponins in DPPH free radical scavenging was enhanced along with the improvement of the to- be-test material concentration, so saponins played a significant role on hydroxyl radical scavenging and possessed certain reducibility. Northern Shaanxi＇ s big jujubes are rich in saponins and possess excellent antioxidant ability that will be enhanced along with the increase of saponins content. Thus, a basis is provided for the effective extension of the jujube industry chain.
基金The National Natural Science Foundation of China(Grant No.81401005)the Natural Science Foundation of Jiangsu Province of China(Grant No.BK20140494)the College Students’Practice Innovation Training Program Projects of Jiangsu Province(Grant No.201611117094X)
文摘In the present study, we aimed to explore the neuroprotective effect of dioscin, a natural steroid saponin, on transient focal cerebral ischemia induced by middle cerebral artery occlusion （MCAO） in mice and its related mechanism, We observed that dioscin （1,5 mg/kg, intracerebroventricular injection 30 min before MCAO） dramatically reduced the cerebral infarct volume, leading to improved neurological symptoms and reduced death of neuron, astrocytes and microglia in the infarct region. The gliosis and the reduced expressions of SOD1 and SOD2 by MCAO in the hippocampal CA1 region were significantly elevated by 1.5 mg/kg dioscin administration. These findings suggested that pretreatment of dioscin had a neuroprotective effect on mice transient focal cerebral ischemia via inhibiting the gliosis and elevating the SOD levels.
