皮胶原黄变机理及抑制黄变方法的研究ppt课件

1、指导老师 ：汤克勇 教授 汇 报 人 ：李双雯1Background and Purpose2Research content3Experiment4Later Scheme Background and Purposeclothesbagsofashoseskin care productfoodstuffhealth foodgelatinalbumen powderSynthetic Polymer MaterialsYellowingcellulose ligninfibroinNatural PolymerSkinmaterial propertiesprimary structur

2、econformationmicrostructureThe relationship between collagen structure and sensitivity to UV radiationResearch contentYellowing of skin collagen Light screening agentYellowing mechanismThe methods of avoiding yellowingfilmsolutionZnOTiO2SiO2pretreatment Extraction Centrifugationsalting-outdialysishy

3、drolysis for 72h mechanical smash0.5 mol/L CH3COOH 4 C ,96 hExtraction of collagenExperimentFig1. SDS-PAGE of collagen extracted from porcine skin by pepsin0.00.10.20.30.40.50.60.74.64.74.84.95.05.15.25.35.4 lg MrRelative Molbility %Fig 2. The relationships between lg Mr and Relative Mobility of Pro

4、tein Molecular Weight Marker collagen Mr 392.5 KDaSolution of Collagen c=3.335 mg/gSolution of Collagen PH 6Light stabilizerUV-312 nmCollagen Films051015202530353334353637383940 whitenessTime/hFig.4 The whiteness of collagen films irradiated for different time 2803003203403603804001020304050607080 T

5、ransmissivity/%Wavelength/nmUV-0h UV-2h UV-8h UV-16h UV-32hFig.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 4000 3500 3000 180015001200 900 600 3000 Wavenumber/cm-10h 32hAmide AAm

6、ide BAmide Amide Collagen solutionFig 6. Photos of collagen after freeze drying (a)UV-0h(b)UV-32h(c)UV-2h abcFig 7. SEM images of collagen fiber(a)UV-0h;(b)UV-32h;(c)UV-2h abc 051015202530351.01.52.02.53.03.5 relative viscosityTime hFig. 8 A plot of relative viscosity (/0) against timenano-ZnOFig 9.

7、 Photos of nano-ZnO modified with different surfactantabcabcFig.10 Photos of nano-ZnO before and after ultrasonic dispersion(a)nano-ZnO;(b)nano-ZnO+PEG400(c)nano-ZnO+Tween-80Fig.11 Photos of nano-ZnO standing for 1h(a)nano-ZnO;(b)nano-ZnO+Tween-80(c)nano-ZnO+PEG400acbFig.12 TEM micrographs of ZnO nanoparticles modified with different surfactant (a)nano-ZnO; (b)nano-ZnO+PEG400; (c)nano-ZnO+Tween-80abcLater SchemeYellowing mechanismModification of ZnO nanoparticles ,TiO2 nanoparticles and SiO2 nanoparticlesStudy