Isothiocyanates(ITCs) extracts were prepared from fresh broccoli.Their antioxidant properties were evaluated by using the in vitro bioassays,including superoxide anion radical( 2 O·-) ,hydroxyl radical(HO·-)...Isothiocyanates(ITCs) extracts were prepared from fresh broccoli.Their antioxidant properties were evaluated by using the in vitro bioassays,including superoxide anion radical( 2 O·-) ,hydroxyl radical(HO·-) and 2,2-diphenyl-1-picrylhydracyl(DPPH·) radical-scavenging methods,lipid peroxidation assay,and reducing power assay.The ITCs extracts exhibited significant dose-dependent antioxidant activities(P<0.01) .Its antioxidant-stability was affected by temperature and storage condition,although it was more stable than vitamin C(Vc) .GC-MS iden-tified sulforaphane in the ITCs extracts.The antioxidant activity of sulforaphane was approximately one tenth to one fifth of that of Vc.Sulforaphane was experimented to be one of dominating contributors to antioxidant capacity of ITCs extracts.However,there was no direct antioxidant activity found for benzyl isothiocyanate(BITC) in vitro. Therefore,it could be concluded that the general group(-N=C=S) was not the essential part for the antioxidant activity of sulforaphane.It is suggested that the ITCs extracts from broccoli can be developed into a promising food additive for healthy food.展开更多
The year 2017 marked not only the 45th anniversary of the establishment of China-Australia diplomatic relations,but also significant turbulence in the relationship.While bilateral economic and trade relations,as well ...The year 2017 marked not only the 45th anniversary of the establishment of China-Australia diplomatic relations,but also significant turbulence in the relationship.While bilateral economic and trade relations,as well as people-to-people communication and cooperation continue to grow,a series of dramatic and negative events unfolded in Australia,advocating the so-called"China threat",and instigated by anti-China sentiments.The recent anti-China backlash in Australia was caused by a combination of deep structural change in the current international system,and instability in Australia’s domestic politics.It is also the outcome of Australia’s dependence on the US-Australia alliance,while balancing between its own economic and security interests.It is worth noting that in comparison to the past,the current anti-China movement in Australia has been more profound and more focused,demonstrating new characteristics.This includes Australia collaborating with certain Western nations against China’s influence,as well as strategic warnings with more political and policy implications.Although Australia’s anti-China backlash will not have a fundamental impact on China-Australia relations,Australia’s anti-China stance and behavior is characteristic of an increasingly prevalent trend among the Western nations of concern about China’s rising influence,and new defense strategies against this.China must proceed with caution when dealing with the negative repercussions of this.展开更多
基金Supported by the Natural Science Foundation of Zhejiang Province(Y3090135)
文摘Isothiocyanates(ITCs) extracts were prepared from fresh broccoli.Their antioxidant properties were evaluated by using the in vitro bioassays,including superoxide anion radical( 2 O·-) ,hydroxyl radical(HO·-) and 2,2-diphenyl-1-picrylhydracyl(DPPH·) radical-scavenging methods,lipid peroxidation assay,and reducing power assay.The ITCs extracts exhibited significant dose-dependent antioxidant activities(P<0.01) .Its antioxidant-stability was affected by temperature and storage condition,although it was more stable than vitamin C(Vc) .GC-MS iden-tified sulforaphane in the ITCs extracts.The antioxidant activity of sulforaphane was approximately one tenth to one fifth of that of Vc.Sulforaphane was experimented to be one of dominating contributors to antioxidant capacity of ITCs extracts.However,there was no direct antioxidant activity found for benzyl isothiocyanate(BITC) in vitro. Therefore,it could be concluded that the general group(-N=C=S) was not the essential part for the antioxidant activity of sulforaphane.It is suggested that the ITCs extracts from broccoli can be developed into a promising food additive for healthy food.
基金financial support from the Young Faculty Research Fund of Beijing Foreign Studies University(2015JT003)
文摘The year 2017 marked not only the 45th anniversary of the establishment of China-Australia diplomatic relations,but also significant turbulence in the relationship.While bilateral economic and trade relations,as well as people-to-people communication and cooperation continue to grow,a series of dramatic and negative events unfolded in Australia,advocating the so-called"China threat",and instigated by anti-China sentiments.The recent anti-China backlash in Australia was caused by a combination of deep structural change in the current international system,and instability in Australia’s domestic politics.It is also the outcome of Australia’s dependence on the US-Australia alliance,while balancing between its own economic and security interests.It is worth noting that in comparison to the past,the current anti-China movement in Australia has been more profound and more focused,demonstrating new characteristics.This includes Australia collaborating with certain Western nations against China’s influence,as well as strategic warnings with more political and policy implications.Although Australia’s anti-China backlash will not have a fundamental impact on China-Australia relations,Australia’s anti-China stance and behavior is characteristic of an increasingly prevalent trend among the Western nations of concern about China’s rising influence,and new defense strategies against this.China must proceed with caution when dealing with the negative repercussions of this.
