Fifty-five evergreen tree's leaves growing less than one year were collected from Shougang industrial area in western suburb of Beijing, including steel plants and its ambient residential areas, recreational parks...Fifty-five evergreen tree's leaves growing less than one year were collected from Shougang industrial area in western suburb of Beijing, including steel plants and its ambient residential areas, recreational parks and farmlands. Rock magnetic properties and heavy metal contents were studied. The results show that the magnetic properties of leaf samples are predominated by low-coercivity magnetite, and both the concentration and grain size of magnetite particles gradually decreased with the distance from the main pollution source increases. Moreover, there is a significant linear relationship between magnetic parameters (the low-field magnetic susceptibility, saturation isothermal remanent magnetization and anhysteretic remanent magnetization) and heavy metals contents (Fe, Pb, V, Cr and Zn) (0.73≤R≤ 0.88). Hence, the magnetic parameters of leaves can serve as a proxy for quick detecting of the recent atmospheric metallic pollution.展开更多
通过对广西北海、广东湛江和福建宁德3个地区可口革囊星虫的脂肪酸、水解氨基酸、游离氨基酸和重金属含量等进行测定,了解可口革囊星虫的肌肉品质、呈味特征并进行食用健康风险评价。在脂肪酸组成方面,在3个地区的可口革囊星虫中均检测...通过对广西北海、广东湛江和福建宁德3个地区可口革囊星虫的脂肪酸、水解氨基酸、游离氨基酸和重金属含量等进行测定,了解可口革囊星虫的肌肉品质、呈味特征并进行食用健康风险评价。在脂肪酸组成方面,在3个地区的可口革囊星虫中均检测出22种脂肪酸,其高胆固醇血症指数(hypercholesterolemia index,HI)分别为北海13.11、湛江14.09、宁德16.64;致动脉粥样硬化指数(atherogenic index,AI)分别为0.49、0.49、0.56;致血栓形成指数(thrombosis index,TI)分别为0.62、0.75、0.81。在水解氨基酸组成方面,在3个地区的可口革囊星虫中均含有17种水解氨基酸,总氨基酸含量(total amino acids,TAA)分别为北海159.70mg·g^(−1)、湛江155.97mg·g^(−1)、宁德161.49mg·g^(−1),且无显著性差异;根据联合国粮农组织/世界卫生组织(Food and Agriculture Organization of the United Nations/Word Health Organization,FAO/WHO)评分模式,以氨基酸评分(amino acid score,AAS)和化学评分(chemical score,CS)为标准时,3个地区的可口革囊星虫的第一、第二限制性氨基酸均分别为蛋氨酸+胱氨酸、缬氨酸;另外,必需氨基酸指数(essential amino acid index,EAAI)分别为11.14、10.62、11.37,说明3个地区可口革囊星虫均可作为理想的蛋白源。在游离氨基酸组成方面,北海可口革囊星虫含15种游离氨基酸,湛江和宁德可口革囊星虫均含16种游离氨基酸,游离氨基酸总含量差异显著(p<0.05);根据味道强度值(taste activity value,TAV)分析得知,3个地区游离氨基酸中谷氨酸、甘氨酸和丙氨酸的TAV值均大于1,说明这3种氨基酸对呈味贡献最大。在重金属含量方面,北海、湛江的可口革囊星虫体内各重金属元素含量大体呈现出Zn>Pb>Cu>As>Cd>Hg的规律,而宁德地区的重金属含量规律为Zn>Cu>Pb>As>Cd>Hg,3个地区的可口革囊星虫都受到重金属Pb的重度污染,其中宁德地区的最为严重;综合污染指数(P)表明,北�展开更多
基金the National Natural Science Foundation of China (Grant Nos. 40374021, 40674033, 40172102)DFG project (AP 34/21)
文摘Fifty-five evergreen tree's leaves growing less than one year were collected from Shougang industrial area in western suburb of Beijing, including steel plants and its ambient residential areas, recreational parks and farmlands. Rock magnetic properties and heavy metal contents were studied. The results show that the magnetic properties of leaf samples are predominated by low-coercivity magnetite, and both the concentration and grain size of magnetite particles gradually decreased with the distance from the main pollution source increases. Moreover, there is a significant linear relationship between magnetic parameters (the low-field magnetic susceptibility, saturation isothermal remanent magnetization and anhysteretic remanent magnetization) and heavy metals contents (Fe, Pb, V, Cr and Zn) (0.73≤R≤ 0.88). Hence, the magnetic parameters of leaves can serve as a proxy for quick detecting of the recent atmospheric metallic pollution.
文摘通过对广西北海、广东湛江和福建宁德3个地区可口革囊星虫的脂肪酸、水解氨基酸、游离氨基酸和重金属含量等进行测定,了解可口革囊星虫的肌肉品质、呈味特征并进行食用健康风险评价。在脂肪酸组成方面,在3个地区的可口革囊星虫中均检测出22种脂肪酸,其高胆固醇血症指数(hypercholesterolemia index,HI)分别为北海13.11、湛江14.09、宁德16.64;致动脉粥样硬化指数(atherogenic index,AI)分别为0.49、0.49、0.56;致血栓形成指数(thrombosis index,TI)分别为0.62、0.75、0.81。在水解氨基酸组成方面,在3个地区的可口革囊星虫中均含有17种水解氨基酸,总氨基酸含量(total amino acids,TAA)分别为北海159.70mg·g^(−1)、湛江155.97mg·g^(−1)、宁德161.49mg·g^(−1),且无显著性差异;根据联合国粮农组织/世界卫生组织(Food and Agriculture Organization of the United Nations/Word Health Organization,FAO/WHO)评分模式,以氨基酸评分(amino acid score,AAS)和化学评分(chemical score,CS)为标准时,3个地区的可口革囊星虫的第一、第二限制性氨基酸均分别为蛋氨酸+胱氨酸、缬氨酸;另外,必需氨基酸指数(essential amino acid index,EAAI)分别为11.14、10.62、11.37,说明3个地区可口革囊星虫均可作为理想的蛋白源。在游离氨基酸组成方面,北海可口革囊星虫含15种游离氨基酸,湛江和宁德可口革囊星虫均含16种游离氨基酸,游离氨基酸总含量差异显著(p<0.05);根据味道强度值(taste activity value,TAV)分析得知,3个地区游离氨基酸中谷氨酸、甘氨酸和丙氨酸的TAV值均大于1,说明这3种氨基酸对呈味贡献最大。在重金属含量方面,北海、湛江的可口革囊星虫体内各重金属元素含量大体呈现出Zn>Pb>Cu>As>Cd>Hg的规律,而宁德地区的重金属含量规律为Zn>Cu>Pb>As>Cd>Hg,3个地区的可口革囊星虫都受到重金属Pb的重度污染,其中宁德地区的最为严重;综合污染指数(P)表明,北�
