研究苦笋壳不同提取相的抗氧化作用和对α-葡萄糖苷酶和α-淀粉酶的活性抑制作用。以70%(体积分数)乙醇和水分别对苦笋壳进行提取,并测定提取物中的黄酮、总酚及总糖含量。以ABTS阳离子自由基、DPPH自由基、·OH清除能力、铁离子抗...研究苦笋壳不同提取相的抗氧化作用和对α-葡萄糖苷酶和α-淀粉酶的活性抑制作用。以70%(体积分数)乙醇和水分别对苦笋壳进行提取,并测定提取物中的黄酮、总酚及总糖含量。以ABTS阳离子自由基、DPPH自由基、·OH清除能力、铁离子抗氧化能力(ferric reducing ability of plasma,FRAP)等方法评价其抗氧化活性,测定乙酸乙酯、正丁醇、石油醚3种萃取相对α-葡萄糖苷酶和α-淀粉酶的抑制活性。结果表明,水提方式总糖含量为(97.3±0.28)%,高于醇提方式。总酚和黄酮含量在醇提相中较高,分别是(28.53±1.67)%和(27.22±2.02)%。从对α-葡萄糖苷酶抑制活性上看,醇提相大于水提相。醇提方式下抗氧化活性:乙酸乙酯相>正丁醇相>石油醚相,乙酸乙酯相对·OH清除能力可达(67.32±1.57)%,乙酸乙酯相对α-葡萄糖苷酶和α-淀粉酶的抑制活性最强,IC_(50)值分别是(0.158±0.003)、(0.104±0.006)mg/mL,酶抑制动力学结果表明苦笋壳乙酸乙酯相对α-葡萄糖苷酶抑制类型为竞争性抑制类型,对α-淀粉酶抑制类型为非竞争性抑制类型。苦笋壳可用于开发降血糖产品的天然资源。展开更多
As a product of the combination of information and energy technology,the energy internet is enormous and complex,and the absence of security safeguards at any aspect of it can cause incalculable damage.Aiming at the p...As a product of the combination of information and energy technology,the energy internet is enormous and complex,and the absence of security safeguards at any aspect of it can cause incalculable damage.Aiming at the problems that Energy Internet terminals are difficult to be trusted and the integrity of massive terminals cannot be guaranteed,this paper designs and implements a set of comprehensive credibility measures and security protection schemes,isolates various malicious operations,and ensures that the system is always in a credible state.Specifically,we develop a secure TF card control program in the Android terminal application layer to realize the overall security scheme.Experimental results prove that this security protection scheme can effectively detect illegal application packages in energy Internet terminal devices,resist malicious programs,and protect key data from theft at the same time,achieving security protection in the“thing-to-thing”interconnection scenario of the Energy Internet.展开更多
文摘研究苦笋壳不同提取相的抗氧化作用和对α-葡萄糖苷酶和α-淀粉酶的活性抑制作用。以70%(体积分数)乙醇和水分别对苦笋壳进行提取,并测定提取物中的黄酮、总酚及总糖含量。以ABTS阳离子自由基、DPPH自由基、·OH清除能力、铁离子抗氧化能力(ferric reducing ability of plasma,FRAP)等方法评价其抗氧化活性,测定乙酸乙酯、正丁醇、石油醚3种萃取相对α-葡萄糖苷酶和α-淀粉酶的抑制活性。结果表明,水提方式总糖含量为(97.3±0.28)%,高于醇提方式。总酚和黄酮含量在醇提相中较高,分别是(28.53±1.67)%和(27.22±2.02)%。从对α-葡萄糖苷酶抑制活性上看,醇提相大于水提相。醇提方式下抗氧化活性:乙酸乙酯相>正丁醇相>石油醚相,乙酸乙酯相对·OH清除能力可达(67.32±1.57)%,乙酸乙酯相对α-葡萄糖苷酶和α-淀粉酶的抑制活性最强,IC_(50)值分别是(0.158±0.003)、(0.104±0.006)mg/mL,酶抑制动力学结果表明苦笋壳乙酸乙酯相对α-葡萄糖苷酶抑制类型为竞争性抑制类型,对α-淀粉酶抑制类型为非竞争性抑制类型。苦笋壳可用于开发降血糖产品的天然资源。
基金Supported by the State Grid Corporation of China Science and Technology Project Funding
文摘As a product of the combination of information and energy technology,the energy internet is enormous and complex,and the absence of security safeguards at any aspect of it can cause incalculable damage.Aiming at the problems that Energy Internet terminals are difficult to be trusted and the integrity of massive terminals cannot be guaranteed,this paper designs and implements a set of comprehensive credibility measures and security protection schemes,isolates various malicious operations,and ensures that the system is always in a credible state.Specifically,we develop a secure TF card control program in the Android terminal application layer to realize the overall security scheme.Experimental results prove that this security protection scheme can effectively detect illegal application packages in energy Internet terminal devices,resist malicious programs,and protect key data from theft at the same time,achieving security protection in the“thing-to-thing”interconnection scenario of the Energy Internet.
