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牛胎盘免疫活性肽提取与酶法制备研究
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摘要
牛胎盘含有丰富的生物活性物质,是乳品企业开发利用的重要资源。对其它来源的免疫活性肽已经有广泛的研究,但对牛胎盘免疫活性肽的开发利用研究不多。因此有必要对牛胎盘免疫活性肽进行分离纯化,并深入探讨牛胎盘免疫活性肽的理化性质,体内外的免疫作用,为牛胎盘及其免疫活性肽的开发利用提供理论基础。
     本论文首先研究了不同提取缓冲液、提取方式和提取条件对牛胎盘水溶性蛋白提取率的影响。确定磷酸盐缓冲液在一次提取条件下的最佳提取参数是温度20℃,时间2h, pH 7.2,料液比1:2 (w/v)。应用超滤在操作压力0.10MPa和操作时间60min以及纳滤在压力0.6MPa和时间90min的条件下对提取的蛋白质溶液进行分离,纳滤分离得到的产物得率为299.4mg/100g原料(湿基以蛋白质计)。纳滤产物经活性检测表明具有显著的免疫调节活性。
     依据淋巴细胞增殖实验作为筛选具有免疫调节活性成分的手段,对纳滤产物中具有免疫调节活性的肽进行DEAE Sepharose CL-6B阴离子交换色谱、Sephadex G-25体积排阻色谱以及Sephasil C18反相高效液相色谱的纯化,得到具有显著的促进淋巴细胞增殖能力的反相层析组分4。该组分利用反相色谱和毛细管电泳鉴定为单一峰,证明其为纯品。
     对具有免疫调节活性的反相层析组分4的结构、理化性质和贮藏稳定性进行研究。采用基质辅助激光解析电离飞行时间质谱、毛细管等电聚焦和蛋白质测序仪分别测得相对分子质量为2134、等电点为3.82、部分氨基酸序列为Tyr-X-Phe-Leu-Gly-Leu-Pro-Gly-X-Thr;含糖性质和紫外光谱确定为不含有糖成分的肽;在温度为-20℃时可以贮藏6个月;处理温度≤40℃和pH6-10时具有显著的促进淋巴细胞增殖活性;对胃蛋白酶和胰蛋白酶水解不稳定;红外光谱和圆二色谱法确定含有螺旋、折叠、转角以及无规卷曲构象的吸收特征,并且随着处理温度的逐渐提高,其组成不断变化。
     根据保健食品功能学评价程序和检验方法的免疫功能指标的评价手段,对不同剂量的牛胎盘水溶性免疫活性肽免疫功能的量效关系进行了测定。结果表明,在500mg/kg、50mg/kg和5mg/kg三个剂量,对于正常小鼠组,各给药组小鼠的血清溶血素值、巨噬细胞的吞噬功能和T淋巴细胞增殖活性比阴性对照组明显增强(P<0.01);对于免疫功能低下小鼠组,各给药组小鼠在脾脏指数、胸腺指数、细胞免疫、体液免疫和单核-巨噬细胞免疫方面比模型对照组得到提高,缓解了小鼠免疫力低下的症状。
     对于提取水溶性免疫活性肽后富含蛋白质的牛胎盘剩余物料,研究了酶法制备具有免疫调节活性的多肽以及酶解产物在微生物培养基中的应用。采用混合酶(中性蛋白酶和胰蛋白酶)在温度46.4℃,pH8.17,酶比1:1,料水比为1:3,总酶量4000u/g的最佳水解条件下对物料进行水解,得到具有显著的促进淋巴细胞增殖活性的酶解产物。经RP-HPLC分离纯化酶解产物得到的组分7免疫调节活性最高,其氨基酸序列为Gly-Gly-Ser-Thr或Gly-Gly-Thr-Ser。此外,活性炭脱色的酶解产物制备成替代蛋白胨,应用到微生物培养基中。啤酒酵母在该蛋白胨培养基与沙氏培养基上的生长曲线相仿,延滞期、指数期、稳定期几乎都在同一时段内,而且吸光值非常接近;大肠杆菌在该蛋白胨培养基与肉汤培养基上的生长也较接近。牛胎盘酶解产物作为替代蛋白胨具有很好的应用前景。
Placenta has plentiful functional active materials and is the important resources for dairy corporation. The immunoactive peptides from different resources have been investigated widely. However, the study on immunoactive peptide from bovine placenta is little. To purify the immunoactive peptide from bovine placenta, discuss on the physiochemical characterization and the immune function in vivo/vitro provide the theoretical base for further study on development and utilization of bovine placenta and its immunoactive peptide.
     This paper firstly investigates the effect of different extraction buffer, extraction mode and extraction condition on water-soluble protein extraction rate of bovine placenta are studied. The best extraction parameter of phosphate buffer at one step extraction are temperature 20℃, time 2h, pH 7.2, material/solution rate 1:2 (w/v). At 0.10MPa working pressure and 60min working time of ultrafiltration and 0.6MPa and 90min of nanofiltration, the extracted protein solution is purified. The ammount of the sample by nanofiltration is 299.4mg/100g ret material (calculated according to protein). The sample by nanofiltration has significant immunomodulatory activity by determining spleen cell proliferation in vitro.
     DEAE Sepharose CL-6B, Sephadex G-25 and Sephasil C18 chromatography are used to purify the peptide with immunomodulatory activity in sample by nanofiltration with spleen cell proliferation for detecting immunomodulatory activity. The fraction 4 by RP-HPLC has significant immunomodulatory activity, shows single peak and is purity as detected by reverse phase chromatogrhphy and capillary electrophoresis.
     The structure, physical and chemical characterization and stability of the fraction 4 by RP-HPLC with immunomodulatory activity are studied. MALDI-TOF-MS, capillary isoelectric focusing and protein sequencer show that its relative molecular mass is 2134, pI is 3.82 and partial amino acid sequence is Tyr-X-Phe-Leu-Gly-Leu-Pro-Gly-X-Thr. It is peptide without carbohydrate as detected by phenol-sulphate reaction and ultraviolet chromatography. It can keep 6 months at -20℃; it has significant immunomodulatory activity at≤40℃and pH6-10. It is unstable to pepsin and trypsin hydrolyzation. It has the absorbance characterization ofα-helical,β-sheet,β-turn and nonregular coil and composition changs with the improved treating temperature as detected by the infrared spectrogram and circular dichroism.
     According to the immune function index of health food function, the relationship between amount and immunomodulatory function is studied at different dosage. Results show that at 500mg/kg、50mg/kg and 5mg/kg, for the normal mice, CH50, phagolytic activity of phagocyte and lymphocyte proliferation of the mice taking the water-soluble immunoactive peptide improve significantly (P<0.01) as compared with the mice not taking; and for the low immune function mice, spleen index, thymus index, cell immunity, body liquid immunity and monocyte-macrophage immunity of the mice taking the water-soluble immunoactive peptide improved as compared with model mice, this relaxes the low immune symptom.
     For the waste material of bovine placenta with plentiful protein after extracting the water-soluble immunoactive peptide, the immunoactive peptide prepared through protease hydrolyzing material and the hydrolysate used in medium are studied. At the optimal hydrolyzing condition of temperature 46.4℃, pH8.17,enzyme ratio 1:1, material/solution 1:3, total enzyme 4000u/g, the waste of bovine placenta is hydrolyzed by the mixed protease (neutral protease and trypsin) and got the hydrolysate with immunomodulatory activity. The hydrolysate is purified by RP-HPLC and fraction 7 has the highest immunomodulatory activity. Its amino acid sequence is Gly-Gly-Ser-Thr or Gly-Gly-Thr-Ser. Another, the decolored hydrolysate by active carbon is used to prepare peptone. The growth curves of Saccharomyces cerevisiae on the medium with this peptone and the Fluid Saboraud Medium are similar. The delay phase, index phase and stable phase are almost at the same time, and the absorbance is close. The growth of Escherichia coli on the medium with this peptone and Fluid Broth Medium is relatively close. The peptone made by bovine placenta hydrolysate has well application prospect.
引文
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