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该研究以热处理后的猪血球冻干粉为原料,通过碱性蛋白酶酶解制备水解蛋白质,并对所制备的水解蛋白质的功能特性和体外抗氧化活性进行研究。结果表明,该水解蛋白质具有较好的溶解性、吸湿性和保湿性及一定的起泡性,较弱的乳化性和泡沫稳定性,相对分子量主要分布在2000~3000。体外抗氧化研究表明,水解蛋白质能够有效地清除•OH、DPPH•,抑制脂质过氧化,同时具有较强的总抗氧化能力和金属螯合能力。 相似文献
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以黑加仑为原料,采用AB-8大孔树脂-Sephadex LH-20凝胶柱层析联用方法和液相色谱-质谱联用技术对黑加仑花色苷进行分离纯化和组分鉴定;分析了不同纯度花色苷在不同pH和温度下的降解动力学;通过1,1-二苯基-2-三硝基苯肼(DPPH)和2,2'-联氮基-双-(3-乙基苯并噻唑啉-6-磺酸)二铵盐(ABTS)自由基的清除评价了不同纯度花色苷的抗氧化能力。结果表明:黑加仑中包含飞燕草素-3-葡萄糖苷、矢车菊素-3-芸香糖苷、牵牛花素-3-葡萄糖苷、芍药素-3,5-二己糖苷和锦葵素-3-半乳糖苷5种组分。经分离纯化后最终获得2种花色苷,分别为飞燕草素-3-葡萄糖苷(A_3)和矢车菊素-3-芸香糖苷(A_4)。pH 3.0和温度50℃时,花色苷的热稳定性最强。不同纯度花色苷组分热降解均符合一级动力学模型。经大孔树脂纯化后的花色苷(A_1)、乙酸乙酯萃取后的花色苷(A_2)、A_3和A_4对DPPH自由基清除率的半数抑制浓度(IC50)分别为9.45、8.17、5.95和7.62 mg/L,而对ABTS自由基清除率的IC50分别为99.38、97.21、78.19和85.54 mg/L。 相似文献
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以油菜籽蛋白质和琼脂粉为原料,采用浇铸法制备共混膜,考察了琼脂用量、热处理、pH以及甘油用量对薄膜机械性能与光学性能的影响。结果表明,对薄膜物理性能影响较显著的因素为琼脂用量、pH和甘油用量,热处理影响不明显。成膜的最佳条件为琼脂用量70%,蛋白质含量为30%,pH=10.0,甘油添加量0.8 g,热处理温度50℃,在该条件下制备的复合膜的抗拉强度和断裂伸长率分别达到35 MPa和10%,较单一的蛋白质薄膜提高了6~10倍;透明度由2.88提高到0.93。 相似文献
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为了扩展紫胶蜡的应用形式,利用Shah法制备纳米紫胶蜡乳液。通过单因素实验对纳米紫胶蜡乳液制备工艺中的各个影响因素进行选择,从中选取对纳米紫胶蜡乳液粒径影响较大的3个因素:乳化剂中三乙醇胺配比、转速、乳化温度进行进一步的优化,根据Box-Behnken中心组合实验设计原理,采用响应曲面法以平均粒径为响应值作响应面和等值曲线,得出最佳工艺条件为:阴离子乳化剂质量分数15.9%、转速890 r/min、乳化温度90℃,在优化条件下制得的乳液平均粒径为30.5 nm,且具有良好的分散性和稳定性。 相似文献
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为了提高乙基麦芽酚的产率和减少废水中氯化钠的含量,采用密闭水解法对以糠醛和氯气为原料合成乙基麦芽酚过程中的常压水解步骤进行改进。通过正交实验对密闭水解法的工艺条件进行了优化,并确定了适宜的工艺条件为:反应温度125℃,反应压力2.1 MPa,溶剂中甲醇的体积分数65%,反应时间3.5 h。与常压水解法比较,乙基麦芽酚的产率可以提高3.9%,氢氧化钠消耗量降低78%,废水中氯化钠的含量降低77.4%,副产品氯甲烷可以回收利用。 相似文献
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油菜籽蛋白质琼脂复合膜的性能研究 总被引:1,自引:0,他引:1
《精细化工》2014,(9)
以油菜籽蛋白质和琼脂粉为原料,采用浇铸法制备共混膜,考察了琼脂用量、热处理、pH以及甘油用量对薄膜机械性能与光学性能的影响。结果表明,对薄膜物理性能影响较显著的因素为琼脂用量、pH和甘油用量,热处理影响不明显。成膜的最佳条件为琼脂用量70%,蛋白质含量为30%,pH=10.0,甘油添加量0.8 g,热处理温度50℃,在该条件下制备的复合膜的抗拉强度和断裂伸长率分别达到35 MPa和10%,较单一的蛋白质薄膜提高了6~10倍;透明度由2.88提高到0.93。 相似文献
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以硝酸锌、乙酸锌及硫酸锌和缩二脲为原料,在甲醇溶液中反应合成了3种含有不同阴离子和结晶水的缩二脲锌配合物[Zn(bi)2](NO3)2·2H2O、[Zn(bi)2](Ac)2·1.5H2O和[Zn(bi)2]SO4·0.25H2O(bi=NH2CONHCONH2),用EDTA配位滴定、元素分析、X射线粉末衍射、红外光谱对产物进行组成和结构表征,并研究了配合物的热分解过程。实验结果表明,锌离子与缩二脲中的羰基氧原子配位,形成了配位数为4的配合物。配合物的热分解过程包括失水、配体及阴离子的氧化分解过程,最后完全分解形成氧化锌。 相似文献
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人胎盘血水解液的一般理化指标、氨基酸组成和含量均与人红细胞水解波接近。用其作为麻疹、风疹和腮腺炎疫苗的保护剂,在疫苗冻干前、冻干后及37℃1周后病毒滴度均能达到规程要求。用于制备麻疹和风疹疫苗共200余批,成品病毒滴度和37℃1周后病毒滴度均优于人红细胞水解液,说明人胎盘血水解液完全可以代替人红细胞水解液作为保护剂用于制备麻疹、风疹和腮腺炎疫苗。 相似文献
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以新鲜猪血为原料,制得了猪血蛋白干粉,选用三种不同类别的蛋白酶在适宜的条件下水解猪血蛋白干粉,并得到精制水解蛋白液。用氨基酸分析仪检测水解液中氨基酸种类及含量,并与医用脑蛋白液进行比较分析。结果表明胰蛋白酶水解效果最好,水解液成分与医用脑蛋白液成分比较接近。 相似文献
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Sun Woo Jin Gi Ho Lee Ji Yeon Kim Chae Yeon Kim Young Moo Choo Whajung Cho Eun Hee Han Yong Pil Hwang Yong An Kim Hye Gwang Jeong 《International journal of molecular sciences》2022,23(3)
Skeletal muscle is a heterogeneous tissue composed of a variety of functionally different fiber types. Slow-twitch type I muscle fibers are rich with mitochondria, and mitochondrial biogenesis promotes a shift towards more slow fibers. Leucine, a branched-chain amino acid (BCAA), regulates slow-twitch muscle fiber expression and mitochondrial function. The BCAA content is increased in porcine whole-blood protein hydrolysates (PWBPH) but the effect of PWBPH on muscle fiber type conversion is unknown. Supplementation with PWBPH (250 and 500 mg/kg for 5 weeks) increased time to exhaustion in the forced swimming test and the mass of the quadriceps femoris muscle but decreased the levels of blood markers of exercise-induced fatigue. PWBPH also promoted fast-twitch to slow-twitch muscle fiber conversion, elevated the levels of mitochondrial biogenesis markers (SIRT1, p-AMPK, PGC-1α, NRF1 and TFAM) and increased succinate dehydrogenase and malate dehydrogenase activities in ICR mice. Similarly, PWBPH induced markers of slow-twitch muscle fibers and mitochondrial biogenesis in C2C12 myotubes. Moreover, AMPK and SIRT1 inhibition blocked the PWBPH-induced muscle fiber type conversion in C2C12 myotubes. These results indicate that PWBPH enhances exercise performance by promoting slow-twitch muscle fiber expression and mitochondrial function via the AMPK/SIRT1 signaling pathway. 相似文献
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以蚕丝为原材料,在不同温度和压力下对蚕丝进行脱胶处理。并用邻苯三酚自氧化法测定各组脱胶液的抗氧化能力。选取抗氧化性能最强的一组脱胶液用高温高压碱法进行水解,得到丝胶多肽水解液,同样考察了水解液的抗氧化性能。结果显示高温高压脱胶的最佳工艺条件为:反应温度100℃,脱胶时间60 min。最佳水解条件为:温度120℃,pH=11,时间4 h。实验结果还显示在0.5~3.0 mL范围内,加样量对脱胶样品的氧自由基清除率有明显影响,当加样量为3 mL时,其氧自由基清除率可达66.67%。 相似文献
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Evgeniya V. Dolgova Svetlana S. Kirikovich Evgeniy V. Levites Vera S. Ruzanova Anastasia S. Proskurina Genrikh S. Ritter Oleg S. Taranov Nikolay A. Varaksin Tatiana G. Ryabicheva Olga Yu. Leplina Alexandr A. Ostanin Elena R. Chernykh Sergey S. Bogachev 《International journal of molecular sciences》2022,23(15)
The main problem related to the studies focusing on group-specific component protein-derived macrophage-activating factor (GcMAF) is the lack of clarity about changes occurring in different types of macrophages and related changes in their properties under the effect of GcMAF in various clinical conditions. We analyzed the antitumor therapeutic properties of GcMAF in a Lewis carcinoma model in two clinical conditions: untreated tumor lesion and tumor resorption after exposure to Karanahan therapy. GcMAF is formed during site-specific deglycosylation of vitamin D3 binding protein (DBP). DBP was obtained from the blood of healthy donors using affinity chromatography on a column with covalently bound actin. GcMAF-related factor (GcMAF-RF) was converted in a mixture with induced lymphocytes through the cellular enzymatic pathway. The obtained GcMAF-RF activates murine peritoneal macrophages (p < 0.05), induces functional properties of dendritic cells (p < 0.05) and promotes in vitro polarization of human M0 macrophages to M1 macrophages (p < 0.01). Treatment of whole blood cells with GcMAF-RF results in active production of both pro- and anti-inflammatory cytokines. It is shown that macrophage activation by GcMAF-RF is inhibited by tumor-secreted factors. In order to identify the specific antitumor effect of GcMAF-RF-activated macrophages, an approach to primary reduction of humoral suppressor activity of the tumor using the Karanahan therapy followed by macrophage activation in the tumor-associated stroma (TAS) was proposed. A prominent additive effect of GcMAF-RF, which enhances the primary immune response activation by the Karanahan therapy, was shown in the model of murine Lewis carcinoma. Inhibition of the suppressive effect of TAS is the main condition required for the manifestation of the antitumor effect of GcMAF-RF. When properly applied in combination with any chemotherapy, significantly reducing the humoral immune response at the advanced tumor site, GcMAF-RF is a promising antitumor therapeutic agent that additively destroys the pro-tumor properties of macrophages of the tumor stroma. 相似文献
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文章使用DFT法,利用GaussView画图,用Gaussian软件包在b3lyp/6-31G机组下对6种苦参黄酮进行优化计算。从计算结果可推断:8位香叶基或异戊烯基取代,及C2,C3双键、C3羟基是增强黄酮类化合物抗氧化活性的有效部位。 相似文献