介绍了采用脱酸剂 S 对直馏柴油进行脱酸精制方法,结果表明,当原料酸度为20.00 mgKOH/100 mL 时,S 剂的加入量为400 μg/g 即可,S 剂的加入量应随原料油酸度而变化;精制脱酸油的酸度应以尽量接近0为宜。对采用脱酸剂 S 精制柴油的效果...介绍了采用脱酸剂 S 对直馏柴油进行脱酸精制方法,结果表明,当原料酸度为20.00 mgKOH/100 mL 时,S 剂的加入量为400 μg/g 即可,S 剂的加入量应随原料油酸度而变化;精制脱酸油的酸度应以尽量接近0为宜。对采用脱酸剂 S 精制柴油的效果进行评价,结果表明,对成品柴油质量无不良影响,在柴油罐底水中加入3%的抗乳化剂 A 和0.2%抗酸度回升剂 E 可解决脱酸油乳化及遇水酸度回升问题。直馏柴油无碱脱酸成本简要概算为2.922元/t 油。展开更多
AIM: To investigate the protective effect and possible mechanism of L-arginine preconditioning on ischemia and reperfusion injury associated with small bowel transplantation (SBT).METHODS: Male inbred Wistar rats weig...AIM: To investigate the protective effect and possible mechanism of L-arginine preconditioning on ischemia and reperfusion injury associated with small bowel transplantation (SBT).METHODS: Male inbred Wistar rats weighting between 180 and 250 g were used as donors and recipients in thestudy. Heterotopic rat SBT was performed according to the techniques of Li and Wu. During the experiment, intestinal grafts were preserved in 4 ℃ Ringer's solution for 8 h before being transplanted. Animals were divided into three groups. In group 1, donors received intravenous L-arginine (50 mg/kg, 1 mL) injection 90 min before graft harvesting. However, donors in control group were given normal saline (NS) instead. In group 3, six rats were used as sham-operated control. Specimens were taken from intestinal grafts 15 min after reperfusion. Histological grading, tissue malondialdehyde (MDA) and myeloperoxidase (MPO) levels were assessed. The graft survival of each group was monitored daily until 14 d after transplantation. RESULTS: Levels of MDA and MPO in intestine of shamoperated rats were 2.0±0.22 mmol/g and 0.66±0.105 U/g. Eight hours of cold preservation followed by 15 min of reperfusion resulted in significant increases in tissue MDA and MPO levels. Pretreatment with L-arginine before graft harvesting resulted in lower enhancement of tissue levels of MDA and MPO and the differences were significant (4.71±1.02 mmol/g vs8.02±3.49 mmol/g, 1.03±0.095 U/g vs 1.53±0.068 U/g, P＜0.05). Besides, animals in L-arginine pretreated group had better histological structures and higher 2-wk graft survival rates comparing with that in NS treated group (3.3±0.52 vs6±0.1, 0/6 vs6/6, P＜0.05or 0.01).CONCLUSION: L-arginine preconditioning attenuates ischemia and reperfusion injury in the rat SBT model,which was due to antioxidant activities partially.展开更多
文摘介绍了采用脱酸剂 S 对直馏柴油进行脱酸精制方法,结果表明,当原料酸度为20.00 mgKOH/100 mL 时,S 剂的加入量为400 μg/g 即可,S 剂的加入量应随原料油酸度而变化;精制脱酸油的酸度应以尽量接近0为宜。对采用脱酸剂 S 精制柴油的效果进行评价,结果表明,对成品柴油质量无不良影响,在柴油罐底水中加入3%的抗乳化剂 A 和0.2%抗酸度回升剂 E 可解决脱酸油乳化及遇水酸度回升问题。直馏柴油无碱脱酸成本简要概算为2.922元/t 油。
文摘AIM: To investigate the protective effect and possible mechanism of L-arginine preconditioning on ischemia and reperfusion injury associated with small bowel transplantation (SBT).METHODS: Male inbred Wistar rats weighting between 180 and 250 g were used as donors and recipients in thestudy. Heterotopic rat SBT was performed according to the techniques of Li and Wu. During the experiment, intestinal grafts were preserved in 4 ℃ Ringer's solution for 8 h before being transplanted. Animals were divided into three groups. In group 1, donors received intravenous L-arginine (50 mg/kg, 1 mL) injection 90 min before graft harvesting. However, donors in control group were given normal saline (NS) instead. In group 3, six rats were used as sham-operated control. Specimens were taken from intestinal grafts 15 min after reperfusion. Histological grading, tissue malondialdehyde (MDA) and myeloperoxidase (MPO) levels were assessed. The graft survival of each group was monitored daily until 14 d after transplantation. RESULTS: Levels of MDA and MPO in intestine of shamoperated rats were 2.0±0.22 mmol/g and 0.66±0.105 U/g. Eight hours of cold preservation followed by 15 min of reperfusion resulted in significant increases in tissue MDA and MPO levels. Pretreatment with L-arginine before graft harvesting resulted in lower enhancement of tissue levels of MDA and MPO and the differences were significant (4.71±1.02 mmol/g vs8.02±3.49 mmol/g, 1.03±0.095 U/g vs 1.53±0.068 U/g, P＜0.05). Besides, animals in L-arginine pretreated group had better histological structures and higher 2-wk graft survival rates comparing with that in NS treated group (3.3±0.52 vs6±0.1, 0/6 vs6/6, P＜0.05or 0.01).CONCLUSION: L-arginine preconditioning attenuates ischemia and reperfusion injury in the rat SBT model,which was due to antioxidant activities partially.
