以羟自由基(OH·)、超氧阴离子自由基(O-2·)的清除率和酪氨酸酶抑制率为研究对象,研究从富含胶原的海产品下脚料中提取的海洋活性胶原肽(Marine active collagen peptides/MACP)的体外活性,并进行初步分离。结果表明:MACP的OH&...以羟自由基(OH·)、超氧阴离子自由基(O-2·)的清除率和酪氨酸酶抑制率为研究对象,研究从富含胶原的海产品下脚料中提取的海洋活性胶原肽(Marine active collagen peptides/MACP)的体外活性,并进行初步分离。结果表明:MACP的OH·清除率(IC501.42mg/mL)高于谷胱甘肽(IC508.92mg/mL)和VC,低于抗氧化剂TBHQ(IC500.375mg/mL)和茶多酚(IC500.382mg/mL);MACP的O-2·清除活性(IC5014.40mg/mL)低于茶多酚(IC504.05mg/mL)和谷胱甘肽(IC500.49mg/mL),却高于TBHQ(IC5017.52mg/mL)。MACP抑制酪氨酸酶的IC50为17.06mg/mL,为常用美白剂——熊果苷的1/70。酶解液经截流相对分子质量分别为10000、4000、1000的超滤膜分离,其活性随相对分子质量的减小而增大,且清除自由基和抑制酪氨酸酶的最大活性相对分子质量都集中在1000以下。对相对分子质量小于1000的MACP成分进行葡聚糖凝胶DEAE-A25阴离子交换分离,得到2个洗脱峰,且活性成分主要集中在第1个峰上。将MACP应用于功能食品或美白化妆品中开发前景良好。展开更多
Objective: To evaluate retrospectively the effect of general anesthesia on DNA damage in the blood mononuclear cells (PBMCs) of surgical patients in order to provide evidence for a better nursing care during the proce...Objective: To evaluate retrospectively the effect of general anesthesia on DNA damage in the blood mononuclear cells (PBMCs) of surgical patients in order to provide evidence for a better nursing care during the procedure. Methods: Clinical charts of 76 patients who underwent operation under general anesthesia and 76 healthy control subjects with documented results of DNA damage extent in PBMCs from the single-cell gel electrophoresis (SCGE) or comet assay and serum contents of superoxide dismutase (SOD) and malondialdehyde (MDA) from biochemical analyses were reviewed. The percentage of comet PBMCs and tail DNA and serum contents of SOD and MAD were analyzed by student t-test. Results: Compared with healthy control subjects, generally anesthetized surgical patients had significantly higher % comet PBMCs and % tail DNA (P < 0.05) and significantly lower serum concentrations of SOD (P < 0.05) and significantly higher serum concentrations of MAD (P < 0.05). Compared with levels before general anesthesia in surgical patients, % comet PBMCs, % tail DNA, and serum levels of MAD were significantly higher (P < 0.05 or 0.01), and serum levels of SOD were significantly lower (P < 0.05), after general anesthesia. Conclusions: General anesthesia during surgery causes a certain degree of hypoxia and PBMC damage. Particular attention should be paid to monitoring and maintenance of blood oxygen saturation in patients undergoing surgery under general anesthesia.展开更多
文摘以羟自由基(OH·)、超氧阴离子自由基(O-2·)的清除率和酪氨酸酶抑制率为研究对象,研究从富含胶原的海产品下脚料中提取的海洋活性胶原肽(Marine active collagen peptides/MACP)的体外活性,并进行初步分离。结果表明:MACP的OH·清除率(IC501.42mg/mL)高于谷胱甘肽(IC508.92mg/mL)和VC,低于抗氧化剂TBHQ(IC500.375mg/mL)和茶多酚(IC500.382mg/mL);MACP的O-2·清除活性(IC5014.40mg/mL)低于茶多酚(IC504.05mg/mL)和谷胱甘肽(IC500.49mg/mL),却高于TBHQ(IC5017.52mg/mL)。MACP抑制酪氨酸酶的IC50为17.06mg/mL,为常用美白剂——熊果苷的1/70。酶解液经截流相对分子质量分别为10000、4000、1000的超滤膜分离,其活性随相对分子质量的减小而增大,且清除自由基和抑制酪氨酸酶的最大活性相对分子质量都集中在1000以下。对相对分子质量小于1000的MACP成分进行葡聚糖凝胶DEAE-A25阴离子交换分离,得到2个洗脱峰,且活性成分主要集中在第1个峰上。将MACP应用于功能食品或美白化妆品中开发前景良好。
文摘Objective: To evaluate retrospectively the effect of general anesthesia on DNA damage in the blood mononuclear cells (PBMCs) of surgical patients in order to provide evidence for a better nursing care during the procedure. Methods: Clinical charts of 76 patients who underwent operation under general anesthesia and 76 healthy control subjects with documented results of DNA damage extent in PBMCs from the single-cell gel electrophoresis (SCGE) or comet assay and serum contents of superoxide dismutase (SOD) and malondialdehyde (MDA) from biochemical analyses were reviewed. The percentage of comet PBMCs and tail DNA and serum contents of SOD and MAD were analyzed by student t-test. Results: Compared with healthy control subjects, generally anesthetized surgical patients had significantly higher % comet PBMCs and % tail DNA (P < 0.05) and significantly lower serum concentrations of SOD (P < 0.05) and significantly higher serum concentrations of MAD (P < 0.05). Compared with levels before general anesthesia in surgical patients, % comet PBMCs, % tail DNA, and serum levels of MAD were significantly higher (P < 0.05 or 0.01), and serum levels of SOD were significantly lower (P < 0.05), after general anesthesia. Conclusions: General anesthesia during surgery causes a certain degree of hypoxia and PBMC damage. Particular attention should be paid to monitoring and maintenance of blood oxygen saturation in patients undergoing surgery under general anesthesia.
