鸡卵黄免疫球蛋白(IgY)分离纯化的研究

对鸡卵黄免疫球蛋白(IgY)的分离纯化进行了研究.工艺流程为:卵黄→8倍水稀释并搅拌10 min→用HCl调Ph至5.2后在4 ℃静置2 h去沉淀→在上清夜中加入95 %冰乙醇(-20 ℃)使终浓度为60 %(v/v)→4 ℃搅拌20 min后离心(22000 r/min,4 ℃,25 min)→收集沉淀并加入0.028 mol/L NaCl溶液在4 ℃下过滤除去脂蛋白沉淀→收集的滤液用SDS-PAGE法进行纯化得纯度为98 %的1gY.用大肠杆菌(E.coli)对其活性进行测定,效果良好,此方法能保持免疫球蛋白的活性.     

鸡卵黄抗体(IgY)的制备工艺研究

对鸡卵黄抗体(简称IgY)的制备工艺进行研究。通过低温乙醇沉淀、DEAE葡萄糖凝胶A-50离子交换层析、Tris-HCl缓冲液洗脱及Sephadex G200凝胶过滤等逐步纯化免疫球蛋白。研究卵黄稀释倍数、pH值、乙醇添加量以及盐浓度对纯化效果的影响。分离纯化后所得的提取物经检测IgY纯度可达98%。用大肠杆菌(E.coli)对其活性进行测定,效果良好,此方法能很好保持免疫球蛋白的活性。     

冰乙醇分级离心法分离纯化鸡卵黄免疫球蛋白(IgY)的研究

采用冰乙醇分级离心法提取鸡卵黄免疫球蛋白 (Immunoglobulin of egg yolk,IgY).通过低温乙醇沉淀、DEAE 葡萄糖凝胶 A-50 离子交换层析、Tris-HCl 缓冲液洗脱及 Sephadex G200 凝胶过滤等逐步纯化免疫球蛋白.研究卵黄稀释倍数、pH 值、乙醇添加量以及盐浓度对纯化效果的影响.分离纯化后所得的提取物经检测 IgY 纯度可达98%,且很好地保持了免疫球蛋白的活性.     

水稀释法分离鸡卵黄免疫球蛋白的研究

本研究详细探讨了水稀释法分离鸡卵黄免疫球蛋白（Immunoglobulin of Yolk:IgY）的主要工艺条件,当蛋黄液的稀释倍数为6、pH5.2时,IgY的提取率和纯度分别是6.73mg IgY/ml蛋黄、14.66%。比较了水稀释法和聚乙二醇法分离IgY的效果。结果表明,水稀释法更适合于大规模分离食品级IgY。     

四种鸡卵黄免疫球蛋白纯化方法的研究

本文比较了分离纯化鸡卵黄免疫球蛋白(IgY)的四种方法(即水稀释法,聚乙二醇法,葡聚糖硫酸盐法和黄原胶法)。包括IgY产量,纯度,活性,简便性及扩大生产规模的潜力。试验表明:水稀释法(DS)产量最高,然后依次为葡聚糖硫酸盐法(DS),黄原胶法(Xan),聚乙二醇法(PEG);同时发现水稀释法简便、快速、高效,适用于工业化生产。     

一种新型的食品添加剂——鸡卵黄免疫球蛋白

当用某种抗原免疫产蛋母鸡时，鸡可产生相应的多克隆抗体─—免疫球蛋白，并被运送和储存于鸡卵的卵黄中，此种免疫球蛋白称为IgY（ImmumoglobulinofYolk）。一只母鸡一经免疫应答后，即可从其不断生产的鸡卵的卵黄中获得大量的、均一的、高效价的IgY，而且lgY有许多独到的优点，具有许多潜在的应用价值，可代替由免疫小鼠、兔等哺乳动物制备的抗体。因而近年来，国外对IgY的研究应用十分活跃，特别是将IgY作为食品的免疫型强化剂的应用研究正在不断开展，前景非常广阔。一、IgY的特点：1．IgY类似于哺乳动物的igY.分子量为180lH＞，…     

鸡卵黄免疫球蛋白在食品及医学上的应用

鸡卵黄免疫球蛋白由于应用广泛而日益受到人们的重视。本文就鸡卵黄免疫球蛋白在食品及医学中的应用作一介绍     

鸡卵黄免疫球蛋白在食品及医学上的应用

鸡卵黄免疫球蛋白由于应用广泛而日益受到人们的重视。本文就鸡卵黄免疫球蛋白在食品及医学中的应用作一介绍。     

抗变链球菌鸡卵黄免疫球蛋白(IgY)的制备及活性检测

以远缘链球菌(S.sorbrinus 6715血清型g)免疫产卵母鸡,应用酶联免疫吸附测定法(ELISA)测定鸡卵黄中免疫球蛋白(Immunoglobulin of Yolk,IgY)的活性,研究鸡免疫应答并制备出高免抗-S.sorbrinus IgY.结果显示以109 cfu/只剂量免疫的母鸡,第一次免疫后的第七天卵黄中出现特异性IgY,加强免设后抗体效价上升更快,经ELISA法检测,卵黄中的抗体效价到1384.而冷冻干燥后的IgY,其效价要超过12000.     

不同鸡蛋中鸡卵黄免疫球蛋白的比较

采用PEG分步沉淀法分别从京红一号鸡蛋、市售鸡蛋、土鸡蛋中制备鸡卵黄免疫球蛋白(IgY).通过SDS-PAGE分析提取物,发现存在2条主要的蛋白带:分别为66.4kDa和29.0kDa,与文献报道的IgY重链(～ 60kDa)和轻链(～ 30kDa)的分子量相符.     

IgG Antibody from Hen Egg Yolks: Purification by Ethanol Fractionation

A procedure was developed for large-scale preparation of IgG antibodies from egg yolks. The supernatant from egg yolks was obtained after an initial 9–fold dilution with water. The lipids in the supernatant were then almost completely eliminated from the water-soluble protein fraction containing the antibody, by precipitation with 60% ethanol and filtration. Yolk antibody was purified from the lipid-free water-soluble protein fraction by ethanol fractionation at final concentration 30% (pH unadjusted), and again at 25% (pH 7.4). The purified fraction was composed of >99% pure IgG. Recovery of antibody was calculated as 40%.     

鸡蛋清中溶菌酶的应用性研究

介绍了鸡蛋清中溶菌酶的生物化学特性,研究了它在食品、医学、生物工程、日化用品等工业上的应用性,提出其潜在的应用价值和发展前景。     

Simple Separation of Immunoglobulin from Egg Yolk by Ultrafiltration

A water-soluble fraction (WSF) was prepared by filtering 10 times diluted yolk (pH 5.0) stored at 4–6°C through Whatman No. 52 or No.1 filter paper for delipidation. However, solid-phase delipidation using an octadecyl column after filtration through a cellulose powder column was more practical for industrial application. After ultrafiltration (UF) of the WSF (pH 9.0,1.5M NaCl), results showed: Amicon 80–85% recovery, 74–99% purity; Harp 72–74% recovery, 81–84% purity; A/G 75% recovery, 89% purity; Koch 88% purity.     

卵黄高磷蛋白酶解和脱磷对乳化性的影响研究

卵黄高磷蛋白被发现比别的食品蛋白质的乳化性尤其乳液稳定性高。蛋白酶和磷酸酯酶可使乳化活性和乳液稳定性明显降低;卵黄高磷蛋白的蛋白酶水解导致大肽链(高磷酸化核心区50～210个肽)和小肽链裂解(N-端1～49个肽和C-端211～217个肽);不含小肽的肽不具备优秀的乳化特性,蛋白质中一部分小肽在乳化特性中扮演着重要角色;磷酸酯酶处理后,卵黄高磷蛋白中磷酸酯的静电排斥力对乳化性有显著影响;磷酸充分作用后的残基的这部分蛋白质对高乳化特性至关重要。     

Effects of High Hydrostatic Pressure Processing on Hen Egg Compounds and Egg Products

High hydrostatic pressure (HHP), used alone or with other processes, is an emerging technology increasingly used in the food industry to improve microbial safety, and the functionality and bioactive properties of food products. HHP provides a way to reduce energy requirements for food processing and may contribute to improved energy efficiency in the food industry. Hen egg is used by the food industry to formulate many food products. To improve the microbiological safety of egg and egg‐derived products, HHP processing is an attractive alternative to heat‐ pasteurization and a potential technology. However, HHP treatment induces structural modifications of egg components (such as proteins) which could positively or negatively affect the physicochemical and functional properties of egg‐derived products. Improving our knowledge regarding the potential of HHP in the egg industry will add value to the final food products and increase profitability for egg producers and the food industry.     

Hen Egg Yolk Prevents Bacterial Adherence: A Novel Function for a Familiar Food

ABSTRACT: The aim of this study was to evaluate the ability of unfractionated hen egg yolk to prevent the attachment of Salmonella typhimurium to murine intestinal epithelial cells in vitro. Inhibition of adherence was examined microscopically and by an ELISA. Both methods showed that egg yolk from immunized and unimmunized hens significantly reduced bacterial adherence. Optical density (OD) readings ± SD of 0.825 ± 0.016 for untreated bacteria were reduced to 0.335 ± 0.024 and 0.267 ± 0.021 for bacteria pretreated with egg yolk from immunized hens and unimmunized hens, respectively. Microscopic analysis showed that egg yolk from either immunized or unimmunized hens reduced bacterial adherence from 17 ± 2.7 bacteria per epithelial cell to less than 4 bacteria per epithelial cell. These results show that hen egg yolk significantly inhibits adherence of S. typhimurium to intestinal epithelial cells in vitro. Boosting of specific antibody levels does not enhance this antiadhesive effect, suggesting that egg yolk contains novel antiadhesive factors.     

多不饱和脂肪酸在鸡蛋蛋黄中的富集作用

日粮中脂肪酸的含量会影响蛋黄中脂肪酸的组成和含量。在产蛋鸡的日粮中分别添加10%的黄粉虫,10%的紫苏籽,10%的亚麻籽,5%的黄粉虫,5%黄粉虫+5%紫苏籽,5%黄粉虫+5%亚麻籽,研究多不饱和脂肪酸在青壳鸡蛋蛋黄中的富集作用。结果表明:与对照组相比,添加10%黄粉虫和5%黄粉虫+5%紫苏籽的试验组中,蛋黄脂肪酸和胆固醇含量显著变化,明显改善了蛋黄中多不饱和脂肪酸和饱和脂肪酸的比例,同时,ω-6/ω-3发生变化,说明通过改善日粮中脂肪酸的含量和组成,可在蛋黄中富集多不饱和脂肪酸。     

Immunoglobulin Separation from Egg Yolk: A Serial Filtration System

A serial filtration system was developed for separating immunoglobulin from egg yolk (IgY). Egg yolk was diluted 10 times with water, adjusted to pH 5.0, frozen, then thawed. The diluted yolk was diafiltered through a hard filter paper at 4-6°C to produce a clear water-soluble fraction (WSF). The WSF was then delipidated by filtering through a hydrophobic membrane filter. Ultrafiltration of delipidated WSF at pH 9.0, at 4-6°C, in the presence of 1.5M NaCl resulted in electrophoretically pure (>90%) IgY with a recovery of about 92%. Advantages of this method are the use of only a few mild chemicals and the potential of developing a continuous process.     

Separation of Immunoglobulin G from Cheddar Cheese Whey by Avidin-Biotinylated IgY Chromatography

High-purity immunoglobulins (Ig), which may be useful for immunologic supplementation of food products, were isolated from Cheddar cheese whey in a one-step process using avidin-biotinylated yolk immunoglobulin (IgY) column chromatography. Yolk antibodies specific to bovine IgG (IgY_IgG) were biotinylated with biotinyl amido-hexanoic acid-N-hydroxy-sulfo-succinimide ester without any notable effect on antigen-binding activity, and coupled to immobilized avidin columns. The resulting avidin-biotinylated IgY_IgG columns, with binding capacity of 50–55% (w/w percent ratio of IgG to immobilized IgY_IgG), were used for specific binding of IgG from cheese whey. Elution with a commercially available eluent (Actisep) or 0.1 M glycine-HCl buffer at pH 2.8 yielded IgG with purity of 99% by radial immunodiffusion.