scholarly journals IgY extraction and purification from chicken egg yolk

2018 ◽  
Vol 68 (3) ◽  
pp. 265 ◽  
Author(s):  
G BIZANOV
Keyword(s):  
Polyethylene Glycol ◽  
Egg Yolk ◽  
Water Soluble ◽  
Dilution Method ◽  
Scale Production ◽  
Immunoglobulin Y ◽  
Selective Precipitation ◽  
Isolation And Purification ◽  
Enteric Diseases ◽  
Water Dilution

The interest for immunoglobulin Y (IgY) isolation arises from the possible applications of these immunoglobulins in diagnostics and therapeutics. Powered whole eggs or yolks have been used in veterinary medicine as an inexpensive immunoglobulin Y source for the treatment of enteric diseases. Incorporating feed grade egg yolk antibodies into animal diets has been examined extensively in an attempt to limit pathogenic diarrhea causing by Escherichia coli in swine, and limit Salmonella establishment in calves and mice, as well as Campylobacter, Clostridium, and Salmonella in poultry. Thus, therapeutic administration of the IgY might reduce the clinical use of antibiotics, and minimize the risk of developing bacterial antibiotic resistance. Methods of immunoglobulins isolation and purification from hen yolk are reviewed. For a large-scale production, one of the problems is separating the water-soluble protein fraction from the lipids and other hydrophobic substances. Precipitation or aggregation of lipid occurs under various conditions: (1) by use of water dilution under acidic conditions; (2) by means of acids; (3) combination of solvents (chloroform, aceton) which selectively solubilize the lipids; (4) using of 3.5% polyethylene glycol and (5) by applying natural gums (polyanionic polysaccharides). Further purification of IgY after crude extraction can be achieved by selective precipitation. IgY precipitation can be carried out by salt precipitation using saturated solutions of sodium or ammonium sulphate, which dehydrate proteins. Furthermore, selective precipitation is achieved by using 8.8% sodium chloride or at 12% of polyethylene glycol. The methods comparison on the basis of IgY yield, showed that the mean IgY yield obtained by water dilution method or precipitation with salts, or by using polyethylene glycol was 5.6 mg/ml of egg yolk, 6.3 mg/ml of egg yolk and 8.7 mg/ml of egg yolk correspondingly and did not significantly differ between them. Water dilution method seemed to offer the best IgY recoveries. Moreover, this method in combination with chromatography and filtration can be applied easily in an industrial environment. Filtration technology offers the best opportunities for industrial applications while precipitation with polyethylene glycol or salts provides a cheap and easy methodology for laboratory use. In the production of safer foods, an important strategy is to exploit natural antimicrobial agents as alternatives to conventional synthetic chemical preservatives. In this regard, the IgY is of much interest for its potential application in fortified foods, such as administration for prevention of enteric diseases. The use of IgY is cost-effective.

scholarly journals Determination of Immunoglobulin Y Concentration in Yolk Extract Prepared by Water Dilution Method: Comparisons among Three Strains of Chickens

2008 ◽  
Vol 45 (1) ◽  
pp. 82-87 ◽  
Author(s):  
Kohji Kitaguchi ◽  
Masato Minoura ◽  
Miho Noritake ◽  
Makoto Mizutani ◽  
Keiji Kinoshita ◽  
...  
Keyword(s):  
Dilution Method ◽  
Immunoglobulin Y ◽  
Water Dilution

scholarly journals Isolation and Purification of Fucoxanthin from Brown Seaweed Sargassum horneri Using Open ODS Column Chromatography and Ethanol Precipitation

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3777
Author(s):  
Yuemei Ye ◽  
Jingwen Sun ◽  
Liting Wang ◽  
Junwang Zhu ◽  
Wei Cui ◽  
...  
Keyword(s):  
Column Chromatography ◽  
Recovery Rate ◽  
Biological Activities ◽  
Brown Seaweed ◽  
Sargassum Horneri ◽  
Scale Production ◽  
Water Mixture ◽  
Isolation And Purification ◽  
Ethanol Precipitation ◽  
Water Solvent

As an abundant marine xanthophyll, fucoxanthin (FX) exhibits a broad range of biological activities. The preparation of high-purity FX is in great demand, however, most of the available methods require organic solvents which cannot meet the green chemistry standard. In the present study, a simple and efficient purification approach for the purification of FX from the brown seaweed Sargassum horneri was carried out. The FX-rich ethanol extract was isolated by octadecylsilyl (ODS) column chromatography using ethanol–water solvent as a gradient eluent. The overwhelming majority of FX was successfully eluted by the ethanol–water mixture (9:1, v/v), with a recovery rate of 95.36%. A parametric study was performed to optimize the aqueous ethanol precipitation process by investigating the effects on the purity and recovery of FX. Under the optimal conditions, the purity of FX was 91.07%, and the recovery rate was 74.98%. Collectively, the eco-friendly method was cost-efficient for the purification of FX. The developed method provides a potential approach for the large-scale production of fucoxanthin from the brown seaweed Sargassum horneri.

scholarly journals Pilot-Scale Production of Chito-Oligosaccharides Using an Innovative Recombinant Chitosanase Preparation Approach

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 290
Author(s):  
Chih-Yu Cheng ◽  
Chia-Huang Tsai ◽  
Pei-Jyun Liou ◽  
Chi-Hang Wang
Keyword(s):  
Cell Density ◽  
Scale Up ◽  
Cost Effective ◽  
Pilot Scale ◽  
Ionic Concentration ◽  
Dihydrogen Phosphate ◽  
Scale Production ◽  
Sodium Dihydrogen Phosphate ◽  
Selective Precipitation ◽  
Pilot Scale Production

For pilot-scale production of chito-oligosaccharides, it must be cost-effective to prepare designable recombinant chitosanase. Herein, an efficient method for preparing recombinant Bacillus chitosanase from Escherichia coli by elimination of undesirable substances as a precipitate is proposed. After an optimized culture with IPTG (Isopropyl β-d-1-thiogalactopyranoside) induction, the harvested cells were resuspended, disrupted by sonication, divided by selective precipitation, and stored using the same solution conditions. Several factors involved in these procedures, including ion types, ionic concentration, pH, and bacterial cell density, were examined. The optimal conditions were inferred to be pH = 4.5, 300 mM sodium dihydrogen phosphate, and cell density below 1011 cells/mL. Finally, recombinant chitosanase was purified to >70% homogeneity with an activity recovery and enzyme yield of 90% and 106 mg/L, respectively. When 10 L of 5% chitosan was hydrolyzed with 2500 units of chitosanase at ambient temperature for 72 h, hydrolyzed products having molar masses of 833 ± 222 g/mol with multiple degrees of polymerization (chito-dimer to tetramer) were obtained. This work provided an economical and eco-friendly preparation of recombinant chitosanase to scale up the hydrolysis of chitosan towards tailored oligosaccharides in the near future.

Gram-scale production of sugar nucleotides and their derivatives

2021 ◽  
Author(s):  
Shuang Li ◽  
shuaishuai wang ◽  
Yaqian Wang ◽  
Jingyao Qu ◽  
Xianwei Liu ◽  
...  
Keyword(s):  
Scale Production ◽  
Purification Process ◽  
Selective Precipitation ◽  
Sugar Nucleotides ◽  
Production Strategy

Here, we report a practical sugar nucleotides production strategy that combined high-concentrated multienzyme catalyzed reaction and a robust chromatography-free selective precipitation purification process. Twelve sugar nucleoitdes were synthesized at gram-scale...

scholarly journals Effect of DMPA and Molecular Weight of Polyethylene Glycol on Water-Soluble Polyurethane

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1915 ◽  
Author(s):  
Eyob Wondu ◽  
Hyun Woo Oh ◽  
Jooheon Kim
Keyword(s):  
Molecular Weight ◽  
Contact Angle ◽  
Polyethylene Glycol ◽  
Photoelectron Spectroscopy ◽  
Water Solubility ◽  
Soft Segment ◽  
Water Soluble ◽  
Size Exclusion ◽  
Resonance Spectroscopy ◽  
Scanning Calorimetry

In this study water-soluble polyurethane (WSPU) was synthesized from isophorone diisocyanate (IPDI), and polyethylene glycol (PEG), 2-bis(hydroxymethyl) propionic acid or dimethylolpropionic acid (DMPA), butane-1,4-diol (BD), and triethylamine (TEA) using an acetone process. The water solubility was investigated by solubilizing the polymer in water and measuring the contact angle and the results indicated that water solubility and contact angle tendency were increased as the molecular weight of the soft segment decreased, the amount of emulsifier was increased, and soft segment to hard segment ratio was lower. The contact angle of samples without emulsifier was greater than 87°, while that of with emulsifier was less than 67°, indicating a shift from highly hydrophobic to hydrophilic. The WSPU was also analyzed using Fourier transform infrared spectroscopy (FT-IR) to identify the absorption of functional groups and further checked by X-ray photoelectron spectroscopy (XPS). The molecular weight of WSPU was measured using size-exclusion chromatography (SEC). The structure of the WSPU was confirmed by nuclear magnetic resonance spectroscopy (NMR). The thermal properties of WSPU were analyzed using thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC).

FRACTIONATION OF LIVETIN AND THE MOLECULAR WEIGHTS OF THE α- AND β-COMPONENTS

1957 ◽  
Vol 35 (4) ◽  
pp. 241-250 ◽  
Author(s):  
W. G. Martin ◽  
J. E. Vandegaer ◽  
W. H. Cook
Keyword(s):  
Light Scattering ◽  
Soluble Protein ◽  
Soluble Fraction ◽  
Egg Yolk ◽  
Water Soluble ◽  
Water Soluble Fraction ◽  
Molecular Weights ◽  
Water Soluble Protein ◽  
Hen Egg Yolk ◽  
Hen Egg

Livetin, the major water-soluble protein of hen egg yolk, was found to contain three major components having mobilities of −6.3, −3.8, and −2.1 cm.2 sec.−1 volt−1 at pH 8, µ 0.1, and these have been designated α-, β-, and γ-livetin respectively. The α- and β-livetins were separated and purified electrophoretically after removal of γ-livetin by precipitation from 37% saturated ammonium sulphate or 20% isopropanol. The α-, β-, and mixed livetins resembled pseudoglobulins in solubility but γ-livetin was unstable and this loss of solubility has, so far, prevented its characterization. Molecular weights determined by light scattering, osmotic pressure, and Archibald sedimentation procedure yielded respectively: 8.7, 7.8, and 6.7 × 104 for α-livetin, and 4.8, 5.0, and4.5 × 104 for β-livetin. Under suitable conditions of sedimentation and electrophoresis, egg yolk has been shown to contain three components having the same behavior as the three livetins of the water-soluble fraction.

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