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蔷薇藻活性产物的代谢调控及藻蓝蛋白的分离纯化
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摘要
蔷薇藻是一种属红藻门的海洋单细胞微藻,内含淀粉核,蔷薇藻在培养过程中能产生胞外多糖、藻胆蛋白和色素等生物活性物质。本文对蔷薇藻培养基中的氮源进行优化,分别以硝酸钾和尿素为唯一氮源,得到二者的最适浓度;分离纯化该藻的藻蓝蛋白,研究了该藻蓝蛋白的氨基酸组成、稳定性以及体外抗氧化活性。得到以下几个方面的结果:1、以硝酸钾为氮源,当含氮量在1.85~296mmol/L之间,蔷薇藻都能保持良好的生长;在最佳含氮量为3.7mmol/L时,生物量和藻蓝蛋白分别提高了5.13%和15.94%;含氮量为296mmol/L时,获得最高胞外多糖产量,提高了254.87%,表明硝酸盐是蔷薇藻的合适氮源。2、以尿素为氮源,含氮量在1.85~29.6mmol/L之间,藻细胞都能保持良好的生长;在最佳含氮量为14.8mmol/L时,生物量、胞外多糖和藻蓝蛋白分别提高了26.92%、23.58%和35.22%;但是当含氮量≥74mmol/L时,藻细胞死亡,表明高浓度的尿素能抑制蔷薇藻的生长甚至有致死作用。3、硝酸还原酶的酶活测定结果表明了该酶与藻的生物量成正相关,且硝酸钾比尿素更能激发该酶的活性。超氧化物歧化酶的活性随着含氮量的增大而升高。4、经两步硫酸铵沉淀和DEAE Sepharose Fast Flow离子交换柱层析后,得到蔷薇藻的纯藻蓝蛋白的纯度为3.92,SDS-PAGE表明该蛋白由两个亚基组成,分子量分别为18和22kDa,氨基酸测定结果表明该蛋白由17种氨基酸组成。5、藻蓝蛋白在pH为中性、低温避光下具有更高的稳定性。6、通过藻蓝蛋白的体外抗氧化实验,得出纯化后的藻蓝蛋白比粗藻蓝蛋白的抗氧化性更强,而且呈剂量依赖效应。
The unicellular red alga,Rhodella reticulata with a pyrenoid in it,can synthesize some bioactive substances such as exopolysaccharides,phycobiliprotein and pigments.In this paper,we investigated the optimization of nitrogen source,and made potassium nitrate and urea as a sole nitrogen source respectively,obtained the best nitrogen concentration,isolated and purified the phycocyanin from Rhodella reticulata,analyzed the amino acid composition and stability of the phycocyanin,as well as antioxidant activity of phycocyanin in vitro.The results were as follows:
     1.Potassium nitrate as a nitrogen source,Rhodella reticulata grew well when nitrogen concentration was between 1.85~296mmol/L.The production of biomass and phycocyanin had increased 5.13%and 15.94%under the best nitrogen concentration(3.7mmol/L).When the nitrogen concentration was 296mmol/L,the maximum exopolysaccharides of Rhodella reticulata increased 254.87%.Therefore, potassium nitrate was the optimum nitrogen source.
     2.Urea as a nitrogen source,Rhodella reticulata grew well when nitrogen concentration was between 1.85~29.6mmol/L,the production of biomass, exopolysaccharides and phycocyanin had increased 26.92%,23.58%and 35.22%at the best nitrogen concentration(14.8mmol/L).When the nitrogen concentration was above 74 mmol/L,the alga died.It indicated that high concentration of urea could inhibit the growth of Rholdella reticulata.
     3.The nitrate reductase(NR)was rightly related to the biomass of the alga.Potassium nitrate had higher NR activity than urea had did.The enhanced activity of superoxide dismutase was due to an increase in concentration of nitrogen.
     4.We used DEAE Sepharose Fast Flow ion exchange chromatography in combination of ammonium sulfate fractionation for purification of phycocyanin from Rhodella reticulata.The criterion of purity(R)was 3.92,the purified protein has two subunits with molecular mass of 18 and 22kDa each according to SDS-PAGE.The pure phycocyanin contained 17 kinds of amino acid.
     5.The phycocyanin was more stable under unlighted,low temperature and neutrality pH.
     6.For antioxidant activity assay on phycocyanin,the pure phycocyanin had higher antioxidant activity than crude phycocyanin had.Moreover,the pure phycocyanin exhibited effective antioxidant activity in a dose-dependent manner.
引文
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