Alum gelatin solution is the traditional Chinese materials for paper relics ,but excessive use of alum will cause XUAN paper to varying degrees of acidification.In order to understand the effects of alum in alum gelatin solution on different ingredi-ents in XUAN paper ,the effect of alum on cellulose ,calcium carbonate and gelatin in Xuan paper was studied.The effect of al-um on celluloseand calcium carbonate in XUAN paper was studied by attenuated total reflectance Fourier transfer infrared (ATR-FTIR) spectroscopy and X-ray diffraction(XRD).For the first time ,the effect of alum on gelatin in Xuan paper was studied by Fourier self-deconvolution and curve-fitting techniques.XRD and ATR-FTIR results showed that the alum dissolved cellulose and calcium carbonate in the paper and produced calcium sulfate.When the concentration of alum exceeded 5 Wt％ ,the composi-tion changed the most violently ;Fourier self-deconvolution and curve-fitting results showed that alum would change the seconda-ry structure of gelatin protein on XUAN paper ,α-helix ,β-turn and γ-random structures were transformed into β-sheet struc-tures.When the concentration of alum exceeded 5 Wt％ ,the secondary protein structure changed the most violently.In this pa-per ,the effect of alum on different ingredients in Xuan paper was expounded ,and the dosage range of alum was given on the ba-sis of minimum interference principle.In addition ,a new method has been introduced to study the secondary structure of protein in paper relics ,and the application range of ATR-FTIR in paper relics has been expanded.%胶矾水是中国传统书画修复和装裱材料,但过量使用明矾会引起宣纸不同程度的酸化.为了解胶矾水中明矾对宣纸中不同成分的影响,明确传统胶矾水中明矾用量范围,减少其对宣纸的危害,采用傅里叶变换衰减全反射红外光谱(ATR-FTIR)和X射线衍射(XRD)研究了明矾对宣纸中纤维素和碳酸钙的影响,并将傅里叶退卷积和二阶导曲线拟合的方法引入研究明矾对宣纸中明胶蛋白质二级结构的影响.X RD和ATR-FTIR结果表明明矾会不同程度溶解纸张中的结晶纤维素、非结晶纤维素和CaCO3(生成CaSO4),在明矾浓度超过5 Wt％ 后成分变化最剧烈.傅里叶退卷积和二阶导曲线拟合结果表明明矾会使宣纸中明胶蛋白质二级结构改变,使α-螺旋结构、β-转向结构和γ-随机结构向β-折叠结构转变.在明矾浓度超过5 Wt％后,蛋白质二级结构发生剧烈变化.研究得出了明矾对宣纸中不同成分的影响,在最小干预的文物保护原则基础上给出了明矾用量范围,为纸质文物中蛋白质二级结构研究引入了一种新方法,扩大了ATR-FTIR在纸质文物中的研究和应用范围.
展开▼
