A novel gradient pressurized capillary electrochromatography (pCEC) instrument was developed to separate peptides. Two gradient elution modes, hydrophobic and hydrophilic interaction mode in pCEC, were performed on t...A novel gradient pressurized capillary electrochromatography (pCEC) instrument was developed to separate peptides. Two gradient elution modes, hydrophobic and hydrophilic interaction mode in pCEC, were performed on this instrument. Baseline separation of six peptides was obtained on two gradient modes with C18 column and strong cationic exchange column respectively. The effects of mixer volume and total flow rate of pumps on resolution were also discussed.展开更多
Moleculary imprinted polymers using p-hydroxybenzoic acid as templates wassynthesized by an in situ polymerization reaction and rendered capillary monolithic column wasused in capillary electrochromatographic mode. Go...Moleculary imprinted polymers using p-hydroxybenzoic acid as templates wassynthesized by an in situ polymerization reaction and rendered capillary monolithic column wasused in capillary electrochromatographic mode. Good molecular recognition was achieved for p-hydroxybenzoic acid and good resolution of isomers can be realized.展开更多
AIM: To provide hepatic protection through administration of doxorubicin before stop-flow chemotherapy (SFC) and to investigate the expression of heat shock protein 72(HSP72) and role of nuclear factor kappa B (NF-kB)...AIM: To provide hepatic protection through administration of doxorubicin before stop-flow chemotherapy (SFC) and to investigate the expression of heat shock protein 72(HSP72) and role of nuclear factor kappa B (NF-kB) in this effect.METHODS: The hepatic preconditioning of doxorubicin was established in a porcine model by injection of doxorubidn(1 mg/kg) before SFC. The experimental animals were randomized into two groups: groups receiving doxorubicin(DOX) and normal saline (NS). Serial serum and tissue samples were taken from both groups to evaluate the protection of doxorubicin. Western blot and immunoprecipitation were applied to detect the expression of HSP72, NF-kB p65 protein, inhibitor kB-α (IkB-α) and phosphorylated IkB-α as well. The expression of tumor necrosis factor α (TNF-α) was estimated by semiquantitative RT-PCR. And the extent of the hepatic injury was estimated with the level of serum aminotransferases.RESULTS: An abundance production of HSP72 in porcine liver was observed after 24 h of intravenous administration of doxorubicin, but without any change in the expression of NF-kB p65 subunit in cytoplasm. NF-kB p65 subunit accumulated in nuclei at the end of SFC and reached its highest level at 30 rain after the restoration of the abdominal circulation and decreased gradually during the 6 h after SFC in NS group, while there was little change in DOX group. There was also a slight decrease of IkB-α at 30 min after the restoration of the abdominal circulation in NS group accompanying with the appearance of phosphorylated IkB-α. The expression of TNF-α was significantly higher in NS group than that in DOX group (average 1.40±0.17 vs 0.62±0.22, P<0.01) at serial time points after SFC. Serum ALT and AST levels of NS group were higher after 24 h than those of DOX group (93.2±7.8 IU/L vs 53.34±13.9 IU/L,217.0±29.4 IU/L vs 155.0±15.6 IU/L for ALT and AST respectively, P<0.05) and alter 48 h than those of DOX group (66.6±18.1 IU/L vs 43.3±16.7 IU/L, 174.4±21.3 IU/Lvs 125.7±10.5 IU/L for ALT and AST respectively, P<0.05).CONCLUSION: Doxorubicin renders the liver to be tolerant to the hepatic influence in SFC in a porcine model through the NF-kB/IkB-α pathway with the expression of HSP72.展开更多
A novel monolithic stationary phase having long alkyl chain ligands was introduced and evaluated in pressurized-capillary electrochromatography of small neutral and charged compounds. The monolithic column was prepare...A novel monolithic stationary phase having long alkyl chain ligands was introduced and evaluated in pressurized-capillary electrochromatography of small neutral and charged compounds. The monolithic column was prepared by the in situ copolymerization of ethylene dimethacrylate, 1-hexadecene, allyl alcohol and 2-acrylamido-2-methyl-1-propanesulfonic acid in a quaternary porogenic solvent mixture consisting of 1, 4-butanediol, cyclohexanol, dodecanol and water.展开更多
基金The study is supported by NNSFC,grant No.20175010.
文摘A novel gradient pressurized capillary electrochromatography (pCEC) instrument was developed to separate peptides. Two gradient elution modes, hydrophobic and hydrophilic interaction mode in pCEC, were performed on this instrument. Baseline separation of six peptides was obtained on two gradient modes with C18 column and strong cationic exchange column respectively. The effects of mixer volume and total flow rate of pumps on resolution were also discussed.
文摘Moleculary imprinted polymers using p-hydroxybenzoic acid as templates wassynthesized by an in situ polymerization reaction and rendered capillary monolithic column wasused in capillary electrochromatographic mode. Good molecular recognition was achieved for p-hydroxybenzoic acid and good resolution of isomers can be realized.
基金Supported by the Shanghai Bureau of Health, 99ZDII003
文摘AIM: To provide hepatic protection through administration of doxorubicin before stop-flow chemotherapy (SFC) and to investigate the expression of heat shock protein 72(HSP72) and role of nuclear factor kappa B (NF-kB) in this effect.METHODS: The hepatic preconditioning of doxorubicin was established in a porcine model by injection of doxorubidn(1 mg/kg) before SFC. The experimental animals were randomized into two groups: groups receiving doxorubicin(DOX) and normal saline (NS). Serial serum and tissue samples were taken from both groups to evaluate the protection of doxorubicin. Western blot and immunoprecipitation were applied to detect the expression of HSP72, NF-kB p65 protein, inhibitor kB-α (IkB-α) and phosphorylated IkB-α as well. The expression of tumor necrosis factor α (TNF-α) was estimated by semiquantitative RT-PCR. And the extent of the hepatic injury was estimated with the level of serum aminotransferases.RESULTS: An abundance production of HSP72 in porcine liver was observed after 24 h of intravenous administration of doxorubicin, but without any change in the expression of NF-kB p65 subunit in cytoplasm. NF-kB p65 subunit accumulated in nuclei at the end of SFC and reached its highest level at 30 rain after the restoration of the abdominal circulation and decreased gradually during the 6 h after SFC in NS group, while there was little change in DOX group. There was also a slight decrease of IkB-α at 30 min after the restoration of the abdominal circulation in NS group accompanying with the appearance of phosphorylated IkB-α. The expression of TNF-α was significantly higher in NS group than that in DOX group (average 1.40±0.17 vs 0.62±0.22, P<0.01) at serial time points after SFC. Serum ALT and AST levels of NS group were higher after 24 h than those of DOX group (93.2±7.8 IU/L vs 53.34±13.9 IU/L,217.0±29.4 IU/L vs 155.0±15.6 IU/L for ALT and AST respectively, P<0.05) and alter 48 h than those of DOX group (66.6±18.1 IU/L vs 43.3±16.7 IU/L, 174.4±21.3 IU/Lvs 125.7±10.5 IU/L for ALT and AST respectively, P<0.05).CONCLUSION: Doxorubicin renders the liver to be tolerant to the hepatic influence in SFC in a porcine model through the NF-kB/IkB-α pathway with the expression of HSP72.
文摘A novel monolithic stationary phase having long alkyl chain ligands was introduced and evaluated in pressurized-capillary electrochromatography of small neutral and charged compounds. The monolithic column was prepared by the in situ copolymerization of ethylene dimethacrylate, 1-hexadecene, allyl alcohol and 2-acrylamido-2-methyl-1-propanesulfonic acid in a quaternary porogenic solvent mixture consisting of 1, 4-butanediol, cyclohexanol, dodecanol and water.
