Herein,we report a novel sensor to detect trypsin using a purpose-designed fluorescein-labelled peptide with negatively charged carbon nanoparticles(CNPs)modified by acid oxidation.The fluorescence of the fluorescein-...Herein,we report a novel sensor to detect trypsin using a purpose-designed fluorescein-labelled peptide with negatively charged carbon nanoparticles(CNPs)modified by acid oxidation.The fluorescence of the fluorescein-labelled peptide was quenched by CNPs.The sensor reacted with trypsin to cleave the peptide,resulting in the release of the dye moiety and a substantial increase in fluorescence intensity,which was dose-and time-dependent,and trypsin could be quantified accordingly.Correspondingly,the biosensor has led to the development of a convenient and efficient fluorescent method to measure trypsin activity,with a detection limit of 0.7 mg/mL.The method allows rapid determination of trypsin activity in the normal and acute pancreatitis range,suitable for point-of-care testing.Furthermore,the applicability of the method has been demonstrated by detecting trypsin in spiked urine samples.展开更多
[目的]探讨鳖甲寡肽I-C-F-6对乙醇诱导的小鼠慢性肝损伤的预防作用,并分析其可能的保护机制。[方法]将90只ICR小鼠随机分为正常对照组、模型组、寡肽低剂量组(0.12 mg/kg)、寡肽高剂量组(0.24 mg/kg)、阳性药组(240.00 mg/kg)。正常对...[目的]探讨鳖甲寡肽I-C-F-6对乙醇诱导的小鼠慢性肝损伤的预防作用,并分析其可能的保护机制。[方法]将90只ICR小鼠随机分为正常对照组、模型组、寡肽低剂量组(0.12 mg/kg)、寡肽高剂量组(0.24 mg/kg)、阳性药组(240.00 mg/kg)。正常对照组和模型组均皮下注射生理盐水(0.12 m L/kg);寡肽低剂量组和寡肽高剂量组分别皮下注射寡肽的生理盐水溶液(0.12 m L/kg);阳性药组灌胃还原型谷胱甘肽生理盐水溶液(0.12 m L/kg),同时除正常对照组外,其余4组给予灌胃40%乙醇(0.12 m L/kg),每日1次,连续16周。16周后,末次给乙醇12 h后处死小鼠采集血液样品和肝组织样品,测定血清谷丙转氨酶(ALT)、谷草转氨酶(AST)和碱性磷酸酶(AKP)的活力,肝组织超氧化物歧化酶(SOD)活力、丙二醛含量(MDA),单胺氧化酶(MAO)的活力,并进行病理组织学检查。[结果]鳖甲寡肽I-C-F-6使灌胃乙醇后小鼠体内ALT、AST、MDA、MAO、AKP的含量显著降低(P<0.05),肝组织匀浆中SOD的活力明显升高(P<0.05),肝脏病理损伤减轻。[结论]鳖甲寡肽I-C-F-6对小鼠慢性酒精性肝损伤具有一定的预防保护作用,其机制可能与抑制脂质过氧化,清除自由基,升高SOD的活力有关。展开更多
文摘Herein,we report a novel sensor to detect trypsin using a purpose-designed fluorescein-labelled peptide with negatively charged carbon nanoparticles(CNPs)modified by acid oxidation.The fluorescence of the fluorescein-labelled peptide was quenched by CNPs.The sensor reacted with trypsin to cleave the peptide,resulting in the release of the dye moiety and a substantial increase in fluorescence intensity,which was dose-and time-dependent,and trypsin could be quantified accordingly.Correspondingly,the biosensor has led to the development of a convenient and efficient fluorescent method to measure trypsin activity,with a detection limit of 0.7 mg/mL.The method allows rapid determination of trypsin activity in the normal and acute pancreatitis range,suitable for point-of-care testing.Furthermore,the applicability of the method has been demonstrated by detecting trypsin in spiked urine samples.
文摘[目的]探讨鳖甲寡肽I-C-F-6对乙醇诱导的小鼠慢性肝损伤的预防作用,并分析其可能的保护机制。[方法]将90只ICR小鼠随机分为正常对照组、模型组、寡肽低剂量组(0.12 mg/kg)、寡肽高剂量组(0.24 mg/kg)、阳性药组(240.00 mg/kg)。正常对照组和模型组均皮下注射生理盐水(0.12 m L/kg);寡肽低剂量组和寡肽高剂量组分别皮下注射寡肽的生理盐水溶液(0.12 m L/kg);阳性药组灌胃还原型谷胱甘肽生理盐水溶液(0.12 m L/kg),同时除正常对照组外,其余4组给予灌胃40%乙醇(0.12 m L/kg),每日1次,连续16周。16周后,末次给乙醇12 h后处死小鼠采集血液样品和肝组织样品,测定血清谷丙转氨酶(ALT)、谷草转氨酶(AST)和碱性磷酸酶(AKP)的活力,肝组织超氧化物歧化酶(SOD)活力、丙二醛含量(MDA),单胺氧化酶(MAO)的活力,并进行病理组织学检查。[结果]鳖甲寡肽I-C-F-6使灌胃乙醇后小鼠体内ALT、AST、MDA、MAO、AKP的含量显著降低(P<0.05),肝组织匀浆中SOD的活力明显升高(P<0.05),肝脏病理损伤减轻。[结论]鳖甲寡肽I-C-F-6对小鼠慢性酒精性肝损伤具有一定的预防保护作用,其机制可能与抑制脂质过氧化,清除自由基,升高SOD的活力有关。
