Heat-Induced Covalent Complex between Casein Micelles and β-Lactoglobulin from Goat's Milk: Identification of an Involved Disulfide Bond

2002 ◽  
Vol 50 (1) ◽  
pp. 185-191 ◽  
Author(s):  
Gwénaële Henry ◽  
Daniel Mollé ◽  
François Morgan ◽  
Jacques Fauquant ◽  
Saïd Bouhallab
Keyword(s):  
Disulfide Bond ◽  
Casein Micelles ◽  
Goat’S Milk ◽  
Goat's Milk ◽  
Β Lactoglobulin ◽  
Covalent Complex

Comparison of the Effects of High Pressure and Thermal Treatments on the Casein Micelles in Goat's Milk

1998 ◽  
Vol 46 (7) ◽  
pp. 2523-2530 ◽  
Author(s):  
Andrew J. R. Law ◽  
Jeffrey Leaver ◽  
Xavier Felipe ◽  
Victoria Ferragut ◽  
Reyes Pla ◽  
...  
Keyword(s):  
High Pressure ◽  
Thermal Treatments ◽  
Casein Micelles ◽  
Goat’S Milk ◽  
Goat's Milk

scholarly journals Determination of whey proteins in different types of milk

2014 ◽  
Vol 83 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Lenka Ruprichová ◽  
Michaela Králová ◽  
Ivana Borkovcová ◽  
Lenka Vorlová ◽  
Iveta Bedáňová
Keyword(s):  
High Performance ◽  
Dairy Product ◽  
Whey Proteins ◽  
Reversed Phase ◽  
Cow’S Milk ◽  
Cow's Milk ◽  
Goat’S Milk ◽  
Different Types ◽  
Goat's Milk ◽  
Β Lactoglobulin

Protein analysis is very important both in terms of milk protein allergy, and of milk and dairy product adulteration (β-lactoglobulin may be an important marker in the detection of milk adulteration). The aim of this study was to detect major whey proteins α-lactalbumin and β-lactoglobulin and their genetic variants by reversed-phase high-performance liquid chromatography. Milk samples from cows (n = 40), goats (n = 40) and sheep (n = 40) were collected at two farms and milk bars in the Czech Republic from April to June 2010. The concentration of α-lactalbumin was higher in goat’s milk (1.27 ± 0.05 g·l-1, P < 0.001) and cow’s milk (1.16 ± 0.02 g·l-1, P = 0.0037) compared to sheep’s milk (0.95 ± 0.06 g·l-1); however, concentration of α-lactalbumin in goat’s milk and cow’s milk did not differ significantly (P < 0.05). Goat’s milk contained less β-lactoglobulin (3.07 ± 0.08 g·l-1) compared to cow’s milk (4.10 ± 0.04 g·l-1, P < 0.001) or sheep’s milk (5.97 ± 0.24 g·l-1, P < 0.001). A highly significant positive correlation (r = 0.8686; P < 0.001) was found between fraction A and B of β-lactoglobulin in sheep’s milk, whereas in cow’s milk there was a negative correlation (r = -0.3010; P = 0.0296). This study summarizes actual information of the whey protein content in different types of milk which may be relevant in assessing their allergenic potential.

scholarly journals The relationship between sensitization to allergens of cow’s and goat’s milk at children with atopic dermatitis

2013 ◽  
Vol 10 (2) ◽  
pp. 61-65
Author(s):  
E E Varlamov ◽  
T S Okuneva ◽  
A N Pampura
Keyword(s):  
Milk Protein ◽  
Goat Milk ◽  
Specific Ige ◽  
Cow’S Milk ◽  
Cow's Milk ◽  
Goat’S Milk ◽  
Goat's Milk ◽  
The Relationship ◽  
Β Lactoglobulin

Introduction. The main principle of treatment of cow’s milk allergy (CMA) is the elimination from the diet of cow’s milk. However recently has been discussing the possibility to substitute the cow’s milk with goat’s milk in children with allergy to cow s milk protein. Background. To determine the relationship between sensitization to cow’s milk specific allergens in goat’s milk sensitized children. Methods. The study included 88 children with suspected allergy to CMA. All patients underwent determination of specific IgE to allergen of cow’s and goat’s milk allergen (ImmunoCAP 100 Phadia AB). We identified 35 children with sensitization to cow’s milk and measured specific IgE to α-laktalbumin, β-lactoglobulin and casein. Results. Sensitization to goat’s milk was estimated in 83% of patients with sensitization to cow’s milk. There was a significant positive correlation between the concentration of specific IgE to goat’s milk allergen and specific IgE to the cow’s milk allergen (R=0,91, p=0,0000001), a-laktalbumin (R=0,76, p=0,000007), β-lactoglobulin (R=0,72, p=0,000038) and casein (R=0,91, p=0,0000001). Conclusion. Formulas based on goat milk can not be considered hypoallergenic for children allergic to cow’s milk. Crosssensitization is mediated mainly with sensitization to casein. Introduction of goat milk and its derivatives in the diet of a child with an allergy to cow’s milk can be proven only by the absence of clinically relevant sensitization to goat milk.

Estimation of Aflatoxin M1 Levels in Some Dairy Products Manufactured from Raw Milk Experimentally Inoculated with Toxin

2019 ◽  
Vol 43 (1) ◽  
pp. 50-58
Author(s):  
H. S. Alnaemi
Keyword(s):  
Dairy Products ◽  
Raw Milk ◽  
Aflatoxin M1 ◽  
Consumer Health ◽  
Goat’S Milk ◽  
White Cheese ◽  
Elisa Technique ◽  
Permissible Levels ◽  
Goat's Milk

     Fate of AflatoxinM1 in soft white cheese and its by-product (whey) and in yogurt locally made from raw sheep's and goat's milk experimentally inoculated with 0.05 and 0.5 µg/l AflatoxinM1 were investigated using ELISA technique. Results reported that AflatoxinM1 was concentrated in cheese at levels significantly higher than that recorded in the raw milk that used for its processing, with a significant decrease in AflatoxinM1 levels in its by-product (whey) comparable to the raw milk used in manufacturing at both inoculated levels. Yogurt produced from raw sheep's milk at second inoculated level exerted AflatoxinM1concentration significantly lower than that present in the milk. Significant differences in AflatoxinM1distribution in cheese and whey produced from sheep's milk comparable to their counterparts produced from goat's milk were recorded. Finally, results revealed the efficacious role of the various dairy manufacturing processes in AflatoxinM1 distribution and the necessity to issue of local legislations concerning the maximum permissible limits for AflatoxinM1 in milk in order to stay within the universal permissible levels for AflatoxinM1 in dairy products to provide greater protection for consumer health. 

Effect of frozen storage on some characteristics of kefir samples made from cow’s and goat’s milk

2021 ◽  
pp. 108201322110037
Author(s):  
Ercan Sarica ◽  
Hayri Coşkun
Keyword(s):  
Organic Acids ◽  
Frozen Storage ◽  
Aerobic Bacteria ◽  
Ph Values ◽  
Flavor Components ◽  
Goat’S Milk ◽  
Volatile Flavor ◽  
Goat's Milk ◽  
Lactobacillus Spp ◽  
Oxalic Acids

This study was aimed to determine the changes in kefir samples (CK and GK) made from cow’s and goat’s milk during frozen storage. The CK and GK samples were first stored at +4 °C for 14 and 21 days. Thereafter, all the samples were frozen at –35 °C for 24 h and kept at –18 °C for 45 days. There was no significant change in the fat, protein, acidity and pH values in both samples during the storage. The values of viscosity, WI and C* were higher in the CK samples while the syneresis value was higher in the GK samples throughout the frozen storage. The microorganisms ( Lactococcus spp., Lactobacillus spp., Leuconostoc spp., total mesophilic aerobic bacteria and yeasts) found in kefir made from goat's milk were more affected from the frozen storage. In both samples, the changes in organic acids and volatile flavor components were not significant during frozen storage, except acetic, citric and oxalic acids and acetaldehyde in GK sample. In addition, CK samples were preferred sensorially more by the panellists during frozen storage.

scholarly journals Optimization of Protein Extraction Method for 2DE Proteomics of Goat’s Milk

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2625
Author(s):  
Muzammeer Mansor ◽  
Jameel R. Al-Obaidi ◽  
Nurain Nadiah Jaafar ◽  
Intan Hakimah Ismail ◽  
Atiqah Farah Zakaria ◽  
...  
Keyword(s):  
Extraction Method ◽  
Protein Extraction ◽  
Chloroform Solution ◽  
Milk Proteins ◽  
Peptide Mass Fingerprinting ◽  
Extraction Methods ◽  
Dairy Goats ◽  
Goat’S Milk ◽  
Peptide Mass ◽  
Goat's Milk

Two-dimensional electrophoretic (2DE)-based proteomics remains a powerful tool for allergenomic analysis of goat’s milk but requires effective extraction of proteins to accurately profile the overall causative allergens. However, there are several current issues with goat’s milk allergenomic analysis, and among these are the absence of established standardized extraction method for goat’s milk proteomes and the complexity of goat’s milk matrix that may hamper the efficacy of protein extraction. This study aimed to evaluate the efficacies of three different protein extraction methods, qualitatively and quantitatively, for the 2DE-proteomics, using milk from two commercial dairy goats in Malaysia, Saanen, and Jamnapari. Goat’s milk samples from both breeds were extracted by using three different methods: a milk dilution in urea/thiourea based buffer (Method A), a triphasic separation protocol in methanol/chloroform solution (Method B), and a dilution in sulfite-based buffer (Method C). The efficacies of the extraction methods were assessed further by performing the protein concentration assay and 1D and 2D SDS-PAGE profiling, as well as identifying proteins by MALDI-TOF/TOF MS/MS. The results showed that method A recovered the highest amount of proteins (72.68% for Saanen and 71.25% for Jamnapari) and produced the highest number of protein spots (199 ± 16.1 and 267 ± 10.6 total spots for Saanen and Jamnapari, respectively) with superior gel resolution and minimal streaking. Six milk protein spots from both breeds were identified based on the positive peptide mass fingerprinting matches with ruminant milk proteins from public databases, using the Mascot software. These results attest to the fitness of the optimized protein extraction protocol, method A, for 2DE proteomic and future allergenomic analysis of the goat’s milk.

Structural and thermodynamic consequences of removal of a conserved disulfide bond from equine β-lactoglobulin

2006 ◽  
Vol 63 (3) ◽  
pp. 595-602 ◽  
Author(s):  
Yoshiteru Yamada ◽  
Kanako Nakagawa ◽  
Takeo Yajima ◽  
Keiko Saito ◽  
Akihito Tokushima ◽  
...  
Keyword(s):  
Disulfide Bond ◽  
Β Lactoglobulin
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