目的研究刺通草各部位营养成分,评价其氨基酸营养价值。方法通过对刺通草花苞、嫩叶、老叶、茎皮等部位的蛋白质、总灰分、氨基酸、氮、磷、钾、钙进行测定与分析,综合评价各部位的营养情况。结果刺通草不同部位的营养成分存在差异,花...目的研究刺通草各部位营养成分,评价其氨基酸营养价值。方法通过对刺通草花苞、嫩叶、老叶、茎皮等部位的蛋白质、总灰分、氨基酸、氮、磷、钾、钙进行测定与分析,综合评价各部位的营养情况。结果刺通草不同部位的营养成分存在差异,花苞的蛋白质及氮、磷、钾含量最高,分别为18.60%、2.98%、0.512%、3.00%;茎皮中总灰分和钙含量最高,分别为31.32%、7.28%,约为花苞和叶的3倍。各部位均检测到16种氨基酸和6种必需氨基酸,总氨基酸含量为47.59~106.57 mg/g,必需氨基酸含量为17.07~38.14 mg/g,必需氨基酸占总氨基酸含量的34.70%~40.27%。精氨酸、谷氨酸、天冬氨酸为花苞和茎皮的主要氨基酸;谷氨酸、天冬氨酸、亮氨酸为嫩叶和老叶的主要氨基酸;刺通草各部位的第一限制性氨基酸为蛋氨酸+胱氨酸;各部位呈味氨基酸和药用氨基酸含量丰富,分别占总氨基酸的88%和56%以上。各部位的氨基酸比值系数分(score of ratio coefficient of amino acid,SRC)值介于65.42~71.11之间,平均值为67.16。结论刺通草花苞的蛋白质等营养含量丰富,叶的氨基酸营养价值较高,茎皮中钙含量非常丰富。本研究可为刺通草资源开发和利用提供科学参考。展开更多
We report on curled polyvinylpyrrolidone(PVP)microfibers fabricated by a modified electrospinning with a small nail as the tip collector.PVP(45 wt%)ethanol solution is electrospun under different working voltages rang...We report on curled polyvinylpyrrolidone(PVP)microfibers fabricated by a modified electrospinning with a small nail as the tip collector.PVP(45 wt%)ethanol solution is electrospun under different working voltages ranging from 10 to 15,20,30 and 40kV.It is found that with the increase of working voltage,the proportion of the curled fibers increases and the uniformity of the curled fibers improves,as well as the repeat distance of the curled structures reducing.Particularly,some curled fibers develop into helical structures under relatively high voltages.Further analyses indicate that the formation mechanism for the curled polymer fibers can be ascribed to electrical driven bending instability and/or mechanical jet buckling when hitting the collector surface.This modified electrospinning technique may be a cost-effective approach for the mass production of curled microfibers.展开更多
文摘目的研究刺通草各部位营养成分,评价其氨基酸营养价值。方法通过对刺通草花苞、嫩叶、老叶、茎皮等部位的蛋白质、总灰分、氨基酸、氮、磷、钾、钙进行测定与分析,综合评价各部位的营养情况。结果刺通草不同部位的营养成分存在差异,花苞的蛋白质及氮、磷、钾含量最高,分别为18.60%、2.98%、0.512%、3.00%;茎皮中总灰分和钙含量最高,分别为31.32%、7.28%,约为花苞和叶的3倍。各部位均检测到16种氨基酸和6种必需氨基酸,总氨基酸含量为47.59~106.57 mg/g,必需氨基酸含量为17.07~38.14 mg/g,必需氨基酸占总氨基酸含量的34.70%~40.27%。精氨酸、谷氨酸、天冬氨酸为花苞和茎皮的主要氨基酸;谷氨酸、天冬氨酸、亮氨酸为嫩叶和老叶的主要氨基酸;刺通草各部位的第一限制性氨基酸为蛋氨酸+胱氨酸;各部位呈味氨基酸和药用氨基酸含量丰富,分别占总氨基酸的88%和56%以上。各部位的氨基酸比值系数分(score of ratio coefficient of amino acid,SRC)值介于65.42~71.11之间,平均值为67.16。结论刺通草花苞的蛋白质等营养含量丰富,叶的氨基酸营养价值较高,茎皮中钙含量非常丰富。本研究可为刺通草资源开发和利用提供科学参考。
基金Supported by the Program for New Century Excellent Talents in University of China under Grand No NCET-07-0472the National Natural Science Foundation of China under Grant No 11074138.
文摘We report on curled polyvinylpyrrolidone(PVP)microfibers fabricated by a modified electrospinning with a small nail as the tip collector.PVP(45 wt%)ethanol solution is electrospun under different working voltages ranging from 10 to 15,20,30 and 40kV.It is found that with the increase of working voltage,the proportion of the curled fibers increases and the uniformity of the curled fibers improves,as well as the repeat distance of the curled structures reducing.Particularly,some curled fibers develop into helical structures under relatively high voltages.Further analyses indicate that the formation mechanism for the curled polymer fibers can be ascribed to electrical driven bending instability and/or mechanical jet buckling when hitting the collector surface.This modified electrospinning technique may be a cost-effective approach for the mass production of curled microfibers.
