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THE ASCORBIC ACID CONTENT OF POTATO TUBERS 总被引:1,自引:1,他引:0
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THE ASCORBIC ACID CONTENT OF POTATO TUBERS 总被引:1,自引:1,他引:0
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余甘子中抗坏血酸的差示分光光度测定法 总被引:1,自引:0,他引:1
本文采用差示分光光度法测定了余甘子果实中的抗坏血酸,方法简便、快速、重现性好、样品(?)试剂用量少,结果与药典的方法吻合。测定结果表明,四川省凉山地区的余甘子果实(?)抗坏血酸含量在0.88~2.4mg/g之间。 相似文献
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特定电磁波对作物幼苗抗坏血酸过氧化物酶活性和谷胱甘肽含量的影响 总被引:4,自引:1,他引:3
特定电磁波辐射器辐照玉米、小麦、绿豆干种子及发芽种子后,加一定量水置28℃恒温下培育,然后定期取样分析测定幼芽和幼苗中抗坏血酸过氧化物酶活力及GSH和抗坏血酸含量。研究指出,特定电磁波显著提高了酶活力及上述两种生理活性物质含量,增加幅度为12%-68%。作者认为用特定电磁波辐照种发芽种子有助于提高作物幼苗的抗逆能力。 相似文献
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低温胁迫对水稻幼苗抗坏血酸含量的影响 总被引:26,自引:0,他引:26
随着低温时间的延长,水稻幼苗抗坏血酸和GSH的含量均平行地下降,抗坏血酸含量与电解质渗出率之间呈负相关。增强低温胁迫程度,随着抗坏血酸含量逐渐减少,MDA含量则逐渐增加。经低温处理后在不同光强下恢复时,抗坏血酸和MDA含量的变化不同。抗氧化剂(GSH、半胱氨酸和巯基乙醇)的预处理可抑制低温引起的抗坏血酸含量的下降。 相似文献
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- Photochemical reduction of plastoquinone by ascorbic acid inethanol was sensitized with some derivatives of chlorophyll.The order of effectiveness was as follows: allomerized chlorophylla > chlorophyllin a > chlorophyll a > chlorophyll b> pheophytin a.
- Quenching of the fluorescence of chlorophylla by plastoquinonewas observed. The quenching constant calculatedwas 71 litreper mole.
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Wendell H. Powers Stanley Lewis Charles R. Dawson 《The Journal of general physiology》1944,27(3):167-180
1. A method is described for the preparation of a highly purified ascorbic acid oxidase containing 0.24 per cent copper. 2. Using comparable activity measurements, this oxidase is about one and a half times as active on a dry weight basis as the hitherto most highly purified preparation described by Lovett-Janison and Nelson. The latter contained 0.15 per cent copper. 3. The oxidase activity is proportional to the copper content and the proportionality factor is the same as that reported by Lovett-Janison and Nelson. 4. When dialyzed free of salt, the blue concentrated oxidase solutions precipitate a dark green-blue protein which carries the activity. This may be prevented by keeping the concentrated solutions about 0.1 M in Na2HPO4. 5. When highly diluted for activity measurements the oxidase rapidly loses activity (irreversibly) previous to the measurement, unless the dilution is made with a dilute inert protein (gelatin) solution. Therefore activity values obtained using such gelatin-stabilized dilute solutions of the oxidase run considerably higher than values obtained by the Lovett-Janison and Nelson technique. 6. The effect of pH and substrate concentration on the activity of the purified oxidase in the presence and absence of inert protein was studied. 相似文献
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