共查询到19条相似文献,搜索用时 234 毫秒
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【目的】优化水解醇溶蛋白生产功能肽的工艺,提高玉米醇溶蛋白的应用价值.【方法】通过正交试验获得从玉米蛋白粉中提取醇溶蛋白的最佳提取时间、提取温度、料液比、乙醇浓度等提取条件;通过碱性蛋白酶和蛋白酶K对玉米醇溶蛋白进行水解生产玉米多肽.【结果和结论】通过正交试验获得了从玉米蛋白粉中提取醇溶蛋白的最佳条件,即:料液比1∶4(g/mL),60℃水浴加热,乙醇体积分数为75%,提取3 h.两步酶解法效率高于单酶解法,两步酶解法先加蛋白酶K反应后再加碱性蛋白酶时水解效果最佳. 相似文献
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[目的]筛选适合工业化生产玉米黄色素及醇溶蛋白的提取工艺。[方法]以玉米淀粉的副产物玉米黄粉为原料,以无水乙醇为提取剂,通过正交试验,考察玉米黄色素、醇溶蛋白的最佳提取条件。[结果]玉米黄色素的最佳提取条件为温度55℃、提取时间2h、固液比1∶4、pH值5.5,各因素影响大小顺序为乙醇体积〉提取时间〉pH值〉温度。醇溶蛋白的最佳提取条件为温度50℃、酒精度70%、固液比1∶4、浸泡时间6h、pH值5.0,各因素影响大小顺序为浸泡时间〉乙醇体积〉温度〉酒精度〉pH值。[结论]该研究为玉米黄色素及醇溶蛋白的工业化生产提供依据。 相似文献
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不同氮水平对高油玉米吉油一号籽粒产量及其营养品质的影响 总被引:15,自引:0,他引:15
不同氮营养水平对高油玉米吉油一号籽粒产量、蛋白质、氨基酸和油脂的影响的研究表明,不同氮营养水平对高油玉米籽粒产量影响较大,施氮增产10.5%~22.9%。在本试验条件下的经济最佳施氮(N)量为180.3 kg·ha-1。不同施氮水平较不施氮均能明显增加高油玉米籽粒蛋白质及其组分中醇溶蛋白和谷蛋白含量,分别增加7.1%~13.3%(平均10.6%)、22.1%~39.1%(平均29.9%)和25.0%~40.7%(平均35.0%),其中施氮175 kg·ha-1时蛋白质含量最高(10.75%),施氮125 k 相似文献
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玉米重要的转录因子Opaque2研究进展 总被引:1,自引:0,他引:1
Opaque 2蛋白是玉米中重要的转录激活因子,该基因的自然突变体o2会使玉米籽粒中赖氨酸含量大幅增加,文中综述了Opaque2基因的结构和该蛋白对玉米中醇溶蛋白基因、胞质丙酮酸磷酸双激酶(CyPPDK 1)基因、赖氨酸-酮戊二酸还原酶/酵母氨酸脱氢酶(LKR/SDH)基因、b32基因等的调控作用,以及o2突变体在玉米育种研究中的应用。 相似文献
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Optical microscopy shows that the protein network in endosperm cells of normal corn is composed of an amorphous matrix in which granules averaging about 2 microns in diameter are embedded. That these granules are rich in zein is demonstrated by their solubility in 80 percent ethanol. High-lysine corn, with submicroscopic granules clearly resolved only in the electron microscope, has a much lower content of zein than normal corn. The small size of subcellular protein granules in high-lysine maize as compared with normal corn correlates with the reported difference in zein content of the two types of corn. 相似文献
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J C Wallace G Galili E E Kawata R E Cuellar M A Shotwell B A Larkins 《Science (New York, N.Y.)》1988,240(4852):662-664
Zeins, the storage proteins of maize, are totally lacking in the essential amino acids lysine and tryptophan. Lysine codons and lysine- and tryptophan-encoding oligonucleotides were introduced at several positions into a 19-kilodalton zein complementary DNA by oligonucleotide-mediated mutagenesis. A 450-base pair open reading frame from a simian virus 40 (SV40) coat protein was also engineered into the zein coding region. Messenger RNAs for the modified zeins were synthesized in vitro with an SP6 RNA polymerase system and injected into Xenopus laevis oocytes. The modifications did not affect the translation, signal peptide cleavage, or stability of the zeins. The ability of the modified zeins to assemble into structures similar to maize protein bodies was assayed by two criteria: assembly into membrane-bound vesicles resistant to exogenously added protease, and ability to self-aggregate into dense structures. All of the modified zeins were membrane-bound; only the one containing a 17-kilodalton SV40 protein fragment was unable to aggregate. These findings suggest that it may be possible to create high-lysine corn by genetic engineering. 相似文献
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利用聚丙稀酰胺凝胶电泳(SDS-PAGE)对热导系玉米种子的可溶性蛋白进行分析,结果表 明,清蛋白、球蛋白、谷蛋白都显示出丰富的带谱。自交系间谱带数目、带的强弱与分布等特点均可 见较明显的差异,可将各供试自交系互相区分出来;醇溶蛋白谱带均较弱,自交系间差异小,难以把 各供试自交系互相区分出来。尽管种子的可溶蛋白质 PAGE 图谱都可作为玉米自交系鉴定的蛋 白质指纹图谱,相比之下,利用清蛋白 PAGE 图谱较为理想。 相似文献
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外源高赖氨酸蛋白质基因对转基因玉米种子中蛋白质和氨基酸组分的影响 总被引:3,自引:0,他引:3
分析了将高赖氨酸蛋白质基因导入玉米后,转基因玉米种子中水溶蛋白、盐溶蛋白、醇溶蛋白和碱溶蛋白组分的变化。结果表明,醇溶蛋白和盐溶蛋白总量发生了增加,水溶蛋白总量保持稳定,而碱溶蛋白量有所下降。免疫印迹结果表明,外源高赖氨酸蛋白的表达量与转基因种子中赖氨酸含量呈正相关性。推测外源高赖氨酸蛋白的表达及富含赖氨酸的水溶蛋白和盐溶蛋白组成的改变是转基因玉米种子中赖氨酸提高的主要原因;转基因玉米种子蛋白质可能是外源基因通过非直接的方式导致的结果。 相似文献
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玉米品质性状的遗传相关和选择方案研究 总被引:8,自引:0,他引:8
利用三重测交法对东农 2号玉米改良群体的 12个品质性状进行遗传相关及选择预期遗传进度的分析。结果表明 ,提高玉米的粗蛋白含量以直接选择为好 ,但是单纯地提高粗蛋白含量并不能改善蛋白质品质 ;对清蛋白与谷醇蛋白含量比的直接选择较易奏效 ,是改善玉米蛋白质品质的可行途径。提高玉米的总淀粉含量以直接选择为好 ,根据籽粒容重进行间接选择也可能有一定的效果 ,但是单纯提高总淀粉含量的同时可能会引起支链淀粉含量的提高 ;提高玉米的粗脂肪含量以直接选择为好 ,通过增加胚 /胚乳重进行间接选择也可能有一定的效果。 相似文献
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Misra PS Jambunathan R Mertz ET Glover DV Barbosa HM McWhirter KS 《Science (New York, N.Y.)》1972,176(4042):1425-1427
The endosperm proteins of the maize mutants, opaque-2, opaque-7, floury-2, brittle-2, and the double mutant of opaque-2 and brittle-2, were separated into five soluble fractions by the Landry-Moureaux method. As compared to their isogenic normal counterparts, the mutant endosperms had higher concentrations of albumins, globulins, and glutelin-3, and lower concentrations of prolamines. The combination of the opaque-2 and brittle-2 genes enhanced this difference. Although the four mutant genes are located on three different chromosomes, they exert a similar effect on endosperm protein composition. Five other starchmodifying mutants with high lysine content resemble the brittle-2 mutant in endosperm protein composition, when the gene is present either singly or combined with opaque-2. Therefore, the pattern of protein synthesis in all maize mutants with high lysine concentrations may be either identical or very similar. Because no synergistic effect on lysine concentration is obtained when floury-2 is combined with opaque-2, different pathways leading to reduced zein synthesis may exist in the floury and starch-modifying mutants with high lysine concentrations. 相似文献