Houttuynia cordata flavonoid and Sophora japonica L. polysaccharide were investigated to develop anti-UV sun-screening agent through UV wavelength scanning spectrum, antioxidant ability and cell viability after UVB ir...Houttuynia cordata flavonoid and Sophora japonica L. polysaccharide were investigated to develop anti-UV sun-screening agent through UV wavelength scanning spectrum, antioxidant ability and cell viability after UVB irradiation. The results showed that the extracts had strong UVA and UVB absorption ability and hydroxyl free radical scavenging ability. The S. japonica L. polysaccharide showed strong anti-UVB irradiation ability according to the cell viability experiment. It suggests that the H. cordata flavonoid and S. japonica L. polysaccharide could be combined as a candidate of anti-UV sun-screening supplement and compensate for the shortcomings of chemical sunscreens against UVA ray.展开更多
Lignin is a kind of natural green polymer with abundant active functional groups and designable molecular structure.In this work,the quaternized lignosulfonate(QLS)with amphoteric characteristic was prepared through c...Lignin is a kind of natural green polymer with abundant active functional groups and designable molecular structure.In this work,the quaternized lignosulfonate(QLS)with amphoteric characteristic was prepared through chemical modification using lignosulfonate sodium(LS).Then,a lignin-confined multilayered two-dimensional composite(QLS/ZnO)was prepared by one-step dynamic hydrothermal method using QLS,zinc nitrate,and hexamethylenetetramine.The QLS/ZnO has a regular pie-shaped structure,which is composed of 3-5 layers of two-dimensional nanosheets with a thickness of~10 nm.It shows excellent ultraviolet light absorption performance and active photoelectron scavenging performance,and thus showing great application potential in polymer materials.The water polyurethane(WPU)and polyvinyl alcohol(PVA)films showed excellent UV shielding performance and good mechanical properties when doped with the QLS/ZnO.The tensile strength of WPU t 0.6 wt%QLS/ZnO and PVA t 0.8 wt%QLS/ZnO composite films is increased by 49%and 24%,respectively,and the elongation at break is increased by 138%and 33%.Furthermore,the composite films showed excellent anti-UV aging resistance after being aged under strong UV irradiation for 14 days.This work is of great significance to the high-value application of industrial lignin in the field of nano-functional materials.展开更多
The sun's ultraviolet(UV)rays are extremely harmful to the skin.In addition to causing sunburn and aging,excessive UV radiation can also lead to benign or malignant skin tumors.This paper reviews the researches on...The sun's ultraviolet(UV)rays are extremely harmful to the skin.In addition to causing sunburn and aging,excessive UV radiation can also lead to benign or malignant skin tumors.This paper reviews the researches on natural active components against damage from UV radiation,and summarizes the types of compounds,research methods and mechanisms of action.Moreover,the main problems in current research are put forward,and the possible development direction in the future is discussed.展开更多
基金Supported by College Students'Practice Innovation Training Project in Henan Province(No.201711834006)Henan Provincial Department of Education(No.15A350008)
文摘Houttuynia cordata flavonoid and Sophora japonica L. polysaccharide were investigated to develop anti-UV sun-screening agent through UV wavelength scanning spectrum, antioxidant ability and cell viability after UVB irradiation. The results showed that the extracts had strong UVA and UVB absorption ability and hydroxyl free radical scavenging ability. The S. japonica L. polysaccharide showed strong anti-UVB irradiation ability according to the cell viability experiment. It suggests that the H. cordata flavonoid and S. japonica L. polysaccharide could be combined as a candidate of anti-UV sun-screening supplement and compensate for the shortcomings of chemical sunscreens against UVA ray.
基金supported by the National Key Research and Development Program of China(No.2018YFB1501503)National Natural Science Foundation of China(NSFC)(Nos.21878114,21908071,and 22038004)+1 种基金Natural Science Foundation of Guangdong,(2018B030311052,2020A1515011319,and 2020B1111380002)the Research Fund Program of Guangdong Provincial Key Lab of Green Chemical Product Technology(GC202107).
文摘Lignin is a kind of natural green polymer with abundant active functional groups and designable molecular structure.In this work,the quaternized lignosulfonate(QLS)with amphoteric characteristic was prepared through chemical modification using lignosulfonate sodium(LS).Then,a lignin-confined multilayered two-dimensional composite(QLS/ZnO)was prepared by one-step dynamic hydrothermal method using QLS,zinc nitrate,and hexamethylenetetramine.The QLS/ZnO has a regular pie-shaped structure,which is composed of 3-5 layers of two-dimensional nanosheets with a thickness of~10 nm.It shows excellent ultraviolet light absorption performance and active photoelectron scavenging performance,and thus showing great application potential in polymer materials.The water polyurethane(WPU)and polyvinyl alcohol(PVA)films showed excellent UV shielding performance and good mechanical properties when doped with the QLS/ZnO.The tensile strength of WPU t 0.6 wt%QLS/ZnO and PVA t 0.8 wt%QLS/ZnO composite films is increased by 49%and 24%,respectively,and the elongation at break is increased by 138%and 33%.Furthermore,the composite films showed excellent anti-UV aging resistance after being aged under strong UV irradiation for 14 days.This work is of great significance to the high-value application of industrial lignin in the field of nano-functional materials.
基金Supported by General Program of Guangxi Natural Science Foundation(2020GXNSFAA238033)。
文摘The sun's ultraviolet(UV)rays are extremely harmful to the skin.In addition to causing sunburn and aging,excessive UV radiation can also lead to benign or malignant skin tumors.This paper reviews the researches on natural active components against damage from UV radiation,and summarizes the types of compounds,research methods and mechanisms of action.Moreover,the main problems in current research are put forward,and the possible development direction in the future is discussed.
