共查询到19条相似文献,搜索用时 114 毫秒
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目的 建立高效液相色谱法(high performance chromatography, HPLC)测定营养强化剂中氯化高铁血红素的含量。方法 采用0.1 mol/L氢氧化钠溶液提取样品, 以Agilent TC-C18为色谱分析柱, 流动相为0.6%乙酸:甲醇=30:70(V:V), 流速1.0 mL/min, 柱温35 ℃, 检测波长399 nm, 采用高效液相色谱-二极管阵列检测器进行检测, 以峰面积外标法定量。结果 该方法在40~140 mg/L范围内线性关系良好, 相关系数r为0.9993, 相对标准偏差(relative standard deviation, RSD)小于1.38%。结论 该方法操作简单、快速、准确、灵敏度高, 适合测定营养强化剂中氯化高铁血红素的含量。 相似文献
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建立并优化非抗凝猪血提取血红素的工艺.以非抗凝猪血为原料,经匀浆、超声波溶血、1%盐酸丙酮分离提取血红素,丙酮蒸馏回收后血红素浓缩析出,再经0.1 mol/L NaOH溶液纯化即得血红素;利用紫外-可见吸收光谱与红外光谱对其进行定性检测,利用紫外分光光度法对其进行定量检测并计算纯度;选择匀浆时间、匀浆后双蒸水加入量、盐酸丙酮溶液与溶血液的体积比(V盐酸丙酮:V溶血液)、搅拌抽提时间等4个因素对血红素产率的影响进行研究,以优化提取工艺.建立非抗凝猪血提取血红素的方法,平均产量为10.6g/kg非抗凝血,平均产率为1.06%,纯度达90.8%;确定的最佳提取工艺条件是:匀浆5min,匀浆后加入等体积双蒸水,V 盐酸丙酮:V溶血液=5:1,搅拌抽提10 min.利用非抗凝猪血提取血红素切实可行,为充分利用我国丰富的猪血资源提供了切实可行的技术路线. 相似文献
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高速逆流色谱分离纯化紫甘蓝花色苷 总被引:1,自引:0,他引:1
优化出超声波溶剂辅助法提取紫甘蓝花色苷的最佳工艺条件,并用高速逆流色谱法对其进行分离纯化,建立HSC-CC分离制备紫甘蓝花色苷类化合物的方法。采用正交试验优化超声波溶剂辅助提取紫甘蓝花色苷的工艺条件,再高速逆流色谱对其进行分离纯化。结果表明,超声波溶剂辅助提取紫甘蓝花色苷的最佳工艺条件为超声时间8min,超声辅助提取温度40℃,乙醇体积分数65%;HSCCC制备紫甘蓝花色苷类化合物的方法:溶剂系统为正丁醇-甲基叔丁基醚-乙腈-水-三氟乙酸(2:2:1:5:0.01,V/V/V/V),流速为2mL/min,主机转速设定为800r/min,紫外检测波长为254nm,在该条件下分离制备得到3种化合物。经HPLC检测其纯度分别为76.28%,45.46%,91.46%。用超声波溶剂辅助和高速逆流色谱能分离得到了高纯度的紫甘蓝花色苷,该法具有简便、快速的优点,为紫甘蓝花色苷的分离纯化提供了高效、稳定、可靠的方法。 相似文献
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The objective of this work was to establish a method to stabilize the color of porcine red blood cell (RBC). First, l-cysteine was chosen to react with hemin chloride to generate a new compound. Subsequently, l-cysteine was chosen to stabilize the color of porcine RBC along with α-lactose. The results indicated that l-cysteine along with α-lactose was effective in preventing porcine hemoglobin from oxidation and delaying porcine RBC discolor during freeze-drying and powder storage. Therefore it is a potential in the stabilizing color of RBC. 相似文献
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《Food chemistry》2005,93(3):503-505
Studies carried out in bovine blood proteins pointed out that they are excellent sources of lysine (Lys), but deficient in isoleucine (Ile) and methionine (Met). The purpose of this investigation was to determine and compare the content of proteins, Lys, Ile and Met in whole blood, red cells and plasma of bovine, porcine and poultry species. Blood from the different species were centrifuged for their separation in plasma and red cells. Proteins, Lys, Ile and Met content in blood and their fractions were determined. Results showed that protein content in bovine and porcine blood and plasma were significantly higher than those for poultry. Red cells and plasma proteins from poultry posses superior levels of Ile than bovine and porcine red cells and plasma. Lys content was high for all blood and fraction species. Met was low in all the species under study. 相似文献
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超声波参数中,超声频率是影响蛋白酶解的主要因素。因此,本实验以不同模式超声频率下得到的莲子蛋白酶解物为研究对象,首先对不同模式超声进行优化,以血管紧张素转化酶(angiotensin converting enzyme,ACE)抑制率和水解度为指标,得出了不同模式下的最优频率参数:单频率超声20 kHz、双频率组合20/35 kHz、三频率超声组合20/35/50 kHz。然后采用表面疏水性、氨基酸分析及内源性荧光光谱等表征不同模式的超声预处理对莲子蛋白酶解物及结构特征影响。结果显示:随着超声频率组合增多,表面疏水性越来越大,疏水性氨基酸含量增多,主要是由于超声预处理使蛋白结构展开,使最初被掩埋在蛋白分子内部的疏水基团暴露。通过荧光光谱发现,超声预处理提高了莲子蛋白的荧光强度,且荧光强度顺序为三频>双频>单频;同时,莲子蛋白酶解物λmax发生轻微的红移现象。上述结果对于莲子蛋白酶解及ACE抑制肽的制备至关重要。 相似文献
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Production of fruiting-body lectins of Pleurotus cornucopiae in methylotrophic yeast Pichia pastoris
Fruiting-body lectin genes obtained from Pleurotus cornucopiae were expressed in Pichia pastoris Because of glycosylation of the products, their molecular mass was larger than that of the corresponding native lectins. They showed binding activity to porcine stomach mucin in the enzyme-linked lectin assay system, but did not agglutinate red blood cells. 相似文献