The chemical composition and antioxidant activity of Magnolia grandiflora L.seed essential oil were examined.By combining gas chromatography and mass spectrometry （GC-MS）,16 types of compounds were identified,includ...The chemical composition and antioxidant activity of Magnolia grandiflora L.seed essential oil were examined.By combining gas chromatography and mass spectrometry （GC-MS）,16 types of compounds were identified,including 40.91% oxygen-containing terpene derivatives,19.51% terpenes,13.97% esters,13.05% nitrogenous compounds,and 3.64% acids.Its capability of removing hydroxyl free radical was lower than that of V c,but it was closer to V c with increasing concentration.In cell experiment,all essential oil concentration （6.9,13.8,27.7,55.5,111.0,and 222.0 g/mL） groups increased cell proliferation by 26% or more （26.0%,38.8%,44.8%,40.2%,35.8%,and 30.4%,respectively）.In rat experiment,the SD rats group showed an at least 38% rise （38.62%,61.68%,and 62.86%,respectively） in glutathione-peroxisome （GSH-Px）activity,which is more than 24% reduction （29.56%,24.30%,and 36.93%） in malondialdehyde （MDA） content,and no significant difference in SOD activity was found.The results show that the essential oil had strong antioxidant activity,without dose effect within the concentration range.展开更多
结合树干解析取样,借助光学显微镜和扫描电镜,分别从宏观角度和微观角度研究了广玉兰木材的解剖构造;利用木材万能力学试验机,参照现行国家标准对广玉兰木材的力学性质进行了测定和分析。结果表明:广玉兰木材属于散孔材,管孔为圆形、椭...结合树干解析取样,借助光学显微镜和扫描电镜,分别从宏观角度和微观角度研究了广玉兰木材的解剖构造;利用木材万能力学试验机,参照现行国家标准对广玉兰木材的力学性质进行了测定和分析。结果表明:广玉兰木材属于散孔材,管孔为圆形、椭圆形,多数为复管孔;轴向薄壁组织量较多,为傍管类的环管束状,且多数为全部包围;木射线纺锤形,多为同型多列,偶有异形射线。广玉兰木材基本密度随着树干高度的增加整体上呈下降趋势,最大基本密度值出现在胸径处,为0.47 g/cm3。广玉兰木材端面硬度、径面硬度、弦面硬度、顺纹抗压强度、顺纹抗拉强度、抗弯强度和抗弯弹性模量分别为4.87 k N、3.84 k N、4.26 k N、35.02 MPa、114.97 MPa、83.30 MPa和10 500 MPa,为高档用材。展开更多
基金Supported by the Foundation of National Agriculture Bureau of China for the Key Research Program (2004.NO.514)
文摘The chemical composition and antioxidant activity of Magnolia grandiflora L.seed essential oil were examined.By combining gas chromatography and mass spectrometry （GC-MS）,16 types of compounds were identified,including 40.91% oxygen-containing terpene derivatives,19.51% terpenes,13.97% esters,13.05% nitrogenous compounds,and 3.64% acids.Its capability of removing hydroxyl free radical was lower than that of V c,but it was closer to V c with increasing concentration.In cell experiment,all essential oil concentration （6.9,13.8,27.7,55.5,111.0,and 222.0 g/mL） groups increased cell proliferation by 26% or more （26.0%,38.8%,44.8%,40.2%,35.8%,and 30.4%,respectively）.In rat experiment,the SD rats group showed an at least 38% rise （38.62%,61.68%,and 62.86%,respectively） in glutathione-peroxisome （GSH-Px）activity,which is more than 24% reduction （29.56%,24.30%,and 36.93%） in malondialdehyde （MDA） content,and no significant difference in SOD activity was found.The results show that the essential oil had strong antioxidant activity,without dose effect within the concentration range.
文摘结合树干解析取样,借助光学显微镜和扫描电镜,分别从宏观角度和微观角度研究了广玉兰木材的解剖构造;利用木材万能力学试验机,参照现行国家标准对广玉兰木材的力学性质进行了测定和分析。结果表明:广玉兰木材属于散孔材,管孔为圆形、椭圆形,多数为复管孔;轴向薄壁组织量较多,为傍管类的环管束状,且多数为全部包围;木射线纺锤形,多为同型多列,偶有异形射线。广玉兰木材基本密度随着树干高度的增加整体上呈下降趋势,最大基本密度值出现在胸径处,为0.47 g/cm3。广玉兰木材端面硬度、径面硬度、弦面硬度、顺纹抗压强度、顺纹抗拉强度、抗弯强度和抗弯弹性模量分别为4.87 k N、3.84 k N、4.26 k N、35.02 MPa、114.97 MPa、83.30 MPa和10 500 MPa,为高档用材。
