CAJ | 학술논문

比较了4种木麻黄树皮的提取物对羟自由基的抑制活性,考察了其中活性最大的山地木麻黄的提取物对马尾松漂白机械浆光致黄化的抑制作用.结果表明,强制光照4 h后,涂有山地木麻黄提取物纸片的白度减小了8.6%,而空白纸片的白度减小了19.2%,显示木麻黄提取物对漂白机械浆光致黄化的抑制作用,但强制光照24 h后,纸片白度基本相同.含有质量分数为0.01%和0.03%的木麻黄提取物的碳酸钙涂布液可大幅减轻漂白机械浆的光致黄化,强制光照24 h后,涂布纸片的白度减小约10%.木麻黄提取物抑制羟自由基的活性越大,其对漂白机械浆光致黄化的抑制作用也越大.
비교료4충목마황수피적제취물대간자유기적억제활성,고찰료기중활성최대적산지목마황적제취물대마미송표백궤계장광치황화적억제작용.결과표명,강제광조4 h후,도유산지목마황제취물지편적백도감소료8.6%,이공백지편적백도감소료19.2%,현시목마황제취물대표백궤계장광치황화적억제작용,단강제광조24 h후,지편백도기본상동.함유질량분수위0.01%화0.03%적목마황제취물적탄산개도포액가대폭감경표백궤계장적광치황화,강제광조24 h후,도포지편적백도감소약10%.목마황제취물억제간자유기적활성월대,기대표백궤계장광치황화적억제작용야월대.
Inhibition activities of the extracts from four kinds of Casuarinas bark to hydroxyl radicals were compared.The extract from C.junghuhniana bark was with the highest activity,and was used to inhibit hght-induced yellowing of bleached mechanical pulp.ISO brightness of the sheet coated with the extract reduced by 8.6%,compared to 19.2% of the control sheet sample after light irradiation for 4 h.The results showed the inhibiting performance of the extract to the light-induced yellowing.But the brightness of the sheets coated with and without the extract was almost the same after light irradiation for 24 h.The coatings containing CaCO_3 and 0.01% and 0.03% ACH showed excellent inhibiting performance to the light-induced yellowing.The ISO brightness of the sheet coated with the coatings reduced by 10% after light irradiation for 24 h.The higher the inhibition activity of the extracts to hydroxyl radical was,the better the inhibiting performance of the coatings to the light-induced yellowing was.