皮胶原黄变机理及抑制黄变方法的的研究共22页PPT资料.ppt

,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,皮胶原黄变机理及抑制黄变方法的研究,Yellowing mechanism and method,s,of,avoiding yellowing of skin collagen,指导老师：汤克勇 教授,汇 报 人：李双雯,1,Background and Purpose,2,R,esearch content,3,Experiment,4,Later Scheme,Background and Purpose,clothes,bag,sofa,shose,skin care product,foodstuff,health food,gelatin,albumen powder,Synthetic Polymer Materials,Yellowing,cellulose,lignin,fibroin,N,atural,P,olymer,Skin,material properties,primary structure,conformation,microstructure,T,he relationship,between collagen structure,and sensitivity to UV,radiation,R,esearch content,Yellowing of skin collagen,L,ight,screening,agent,Yellowing mechanism,The,method,s,of,avoiding yellowing,film,solution,ZnO,TiO,2,SiO,2,pretreatment,Extraction,Centrifuga,tion,salting-out,dialysis,hydrolysis,for,72h,mechanical smash,0.5,mol/L CH,3,COOH,4 C,96 h,Extraction of,collagen,Experiment,Fig1.SDS,-PAGE,of collagen,extracted from porcine skin by pepsin,Fig,2,.The relationships between lg,Mr and Relative Mobility,of Protein Molecular Weight Marker,collagen,Mr,392.5 KDa,Solution of Collagen,c=3.335 mg/g,Solution of Collagen,PH 6,Light stabilizer,UV-312 nm,Collagen Films,Fig.4,The,whiteness,of collagen films,irradiated for different time,Fig.3 UV-vis transmittance spectra of collagen films irradiated for different time,Fig.5,FTIR difference spectra of,collagen,film,and,collagen,film,exposed on,UV,for,32h,Amide A,Amide,B,Amide,Amide,Collagen,solution,Fig 6.Photos of collagen after freeze drying,(a)UV-0h(b)UV-32h(c)UV-2h,a,b,c,Fig 7.,SEM images of,collagen fiber(a)UV-0h;,(b)UV-32h;(c)UV-2h,a,b,c,Fig.,8,A plot of relative viscosity(/,0,)against,time,nano-ZnO,Fig 9.Photos of,nano-ZnO,modified with different surfactant,a,b,c,a,b,c,Fig.10 Photos of,nano-ZnO,before and after,ultrasonic dispersion,(a)nano-ZnO;(b)nano-ZnO+PEG400(c)nano-ZnO+Tween-80,Fig.11 Photos of,nano-ZnO,standing,for,1h,(a)nano-ZnO;(b)nano-ZnO+Tween-80(c)nano-ZnO+PEG400,a,c,b,Fig.12,TEM micrographs of ZnO nanoparticles modified,with,different surfactant,(a)nano-ZnO;(b)nano-ZnO+PEG400;,(c)nano-ZnO+Tween-80,a,b,c,Later Scheme,Yellowing mechanism,M,odification,of,ZnO nanoparticles,TiO,2,nanoparticles,and SiO,2,nanoparticles,Study the yellowing of collagen,modified,with,nanoparticles,Light stabilizer,P,ut,ting,forward,the,yellowing mechanism of collagen,Thank You!,谢谢！,22,