共查询到19条相似文献,搜索用时 46 毫秒
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<正> 大豆,是我国的四大油料作物之一。60年代以前,大豆榨油后的脱脂粕主要作为饲料或肥料,60年代后,大豆中蛋白质的开发和利用才开始被重视,从Burnett在1951年提出大豆蛋白的工业用途起。直至1959年大豆浓缩蛋白(Soy Protein Ooncentrate)才成为食用产品,其中1943年Morse首次提出酸等电点沉淀法(PH4.2/4.5)制取大豆浓缩蛋白,1968年Circle等才发现用乙醇溶液浸出大豆脱脂粕后,对其的风味有很大的改善。醇法大豆浓缩蛋白(醇法SPC)制备流程如下: 相似文献
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超滤法制取大豆浓缩蛋白 总被引:2,自引:0,他引:2
使用植酸酶对脱脂大豆粉溶液处理 ,然后稀释并用超滤膜超滤。所得膜浓缩大豆蛋白含72 5 %蛋白质 ,并且其中植酸浓度大大降低。与目前商业生产相比 ,该方法可提高蛋白得率 17%~ 2 6%。 相似文献
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发酵豆粕生产大豆多肽研究 总被引:12,自引:0,他引:12
利用30L发酵罐发酵豆粕,对微生物法生产大豆多肽的工艺进行了研究。结果显示,随着发酵时间的延长,发酵液水解度不断上升,并在发酵后期达到30%左右;发酵液中的多肽含量先增后减,表明发酵进程是按大豆蛋白水解成多肽,多肽水解成游离氨基酸顺序进行。酶活分析表明发酵菌株Bacillus.subtilisSHZ3能同时分泌蛋白酶和羧肽酶,分别水解大豆蛋白和肽链末端的疏水性氨基酸,使大豆蛋白的水解和多肽的脱苦在发酵过程中一步完成,生产出不苦的大豆多肽。凝胶层析表明,随着发酵时间的延长,发酵液中肽链变短,24h发酵所得主要为300~1000Da具有潜在生物活性的短链肽。 相似文献
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ABSTRACT: Aqueous soy flour solutions (5% w/w) were treated for 3 h at 45 to 50 °C with Crystalzyme®, without enzyme at 45 to 50 °C, or blanched at 80 °C. Solutions were ultra‐ and dia‐filtered to produce membrane soy concentrates (MSC). Total isoflavones of MSCs were 3.02 mg/g, 3.12 mg/g, or 3.42 mg/g, respectively, on a dry weight basis. Membrane processing contributed to approximately 18, 15, or 8% decreases, respectively, in total isoflavones of MSCs compared with soy flour (3.71mg/g). This represents at least an 82% recovery. There was no significant difference in total isoflavone content in any MSC, however the profile of isoflavones as glucosides or aglycones changed with treatment conditions. 相似文献
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功能性大豆浓缩蛋白的性能及应用研究 总被引:20,自引:2,他引:20
功能性大豆浓缩蛋白(FSPC)的乳化活性及乳化稳定性与大豆分离与蛋白相似,对固体脂肪的乳化能力超过分离蛋白,在乳化型碎肉制品中添加可使产品得率及质构超过添加分离蛋白的肉制品,作者认为FSPC的功能性质可能与蛋白分子形成可溶性聚集体有关。 相似文献
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The functionality of membrane processed soy concentrate was very similar to soy flour in terms of solubility and water hydration capacity. The high emulsifying activity index of soy flour is believed to be reflective of its higher solubility, while surface hydrophobicity is believed to be responsible for an equally high emulsifying activity index in acid precipitated soy isolate. The proteins of soy flour and membrane soy concentrate seem to have most of their hydrophobic residues buried in the interior, while they are exposed in acid precipitated soy isolate. Heating resulted in a decrease in solubility but improved the hydration capacity and emulsifying activity of both soy flour and membrane soy concentrate. The essential amino acid profile of concentrate was comparable to current commercial isolates manufactured by acid precipitation. The majority of the polypeptides present in soy flour were observed to be present in the concentrate. The membrane soy concentrate was determined to have the least soybean aroma when compared to both soy flour and acid precipitated soy isolate. 相似文献
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微波对醇法大豆浓缩蛋白起泡性的影响 总被引:3,自引:1,他引:3
为改善醇法大豆浓缩蛋白的功能特性,采用微波技术对醇法大豆浓缩蛋白进行物理改性。通过单因素试验,针对起泡性进行研究,得出最佳影响范围,然后进行正交试验方差分析,最终得出微波技术提高醇法大豆浓缩蛋白起泡性最佳工艺条件:固液比1∶7、功率500W、时间2min、溶液高度2.0cm,在此条件下醇提大豆浓缩蛋白的起泡能力和起泡稳定性可分别提高83.5%和52.0%。 相似文献
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Genistein has been reported to have the most potent anticarcinogenic effect among isoflavones. Conversion of genistin in the glucoside form to genistein in the aglucone form by a b-glucosidase enzyme hydrolytic activity during soy protein concentrate (SPC) preparation was evaluated. The optimum conditions for the conversion of genistin to genistein were pH 5.0, 50 °C incubation temperature, 2 units of enzyme/g of soy flour, 1 h incubation period, and 1:10 (w/v) defatted soy flour to water ratio. Under these conditions, 1.214 mg/g genistein were obtained in SPC and is significantly (p < 0.05) higher than the genistein content in SPC prepared under similar conditions without enzyme addition (0.845 mg/g). 相似文献