Batch dependent - please inquire should you have specific requirements
Buffer
Ionic strength around 200 mM, neutral to slightlyalkaline pH and 20 % glycerol as cryoprotective agent.
Preservative
None
Storage
2-8°C short term, -20°C long term
Introduction
Gliadin (a type of prolamin) is a class of proteins present in wheat and several other cereals within the grass genus Triticum. Gliadins, which are a component of gluten, are essential for giving bread the ability to rise properly during baking. Gliadins and glutenins are the two main components of the gluten fraction of the wheat seed. This gluten is found in products such as wheat flour. Gluten is split about evenly between the gliadins and glutenins, although there are variations found in different sources.
Keywords
Gliadin; Celiac disease; Wheat gliadin
Citations
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Background
Wheat is one of eight common ingestible allergens that can trigger a variety of autoimmune and non-gluten-sensitive diseases. Gluten intake is a key factor in these disorders, and gluten is found primarily in wheat, but also in barley, rye, and oats. As the level of consumption of cereal products increases, so does the incidence of gluten-associated diseases, which seriously affects the quality of life of some populations and can even be life-threatening.
Wheat proteins are categorized on the basis of solubility into water-soluble albumins, salt-soluble globulins, alcohol-soluble gliadin, and acid- and base-soluble glutenin. Gliadin and glutenin, collectively known as gluten, make up about 80-85% of the total protein in wheat and are the storage proteins in wheat. Among them, wheat gliadin is spherical monomer particles, embedded in the reticulated polymerized wheat glutenin, and the two are interwoven to form a multimeric spatial structure, which endows wheat flour with unique viscoelasticity and ductility, making it widely used in the food industry. Wheat gliadin has no subunit structure, and the main body consists of a single polypeptide chain linked by intramolecular forces such as hydrogen bonds, disulfide bonds, van der Waals forces, and hydrophobic interactions. And its secondary structure is influenced by wheat varieties and growing conditions. In addition, natural ingredients such as polysaccharides, proteins and polyphenols can bind to wheat gliadin proteins to alter their structure. α- and γ-gliadin are the major antigens responsible for celiac disease, and ω-5 gliadin is the most common allergen in wheat-dependent exercise-induced anaphylaxis.
Figure 1. Approximate breakdown of wheat components (Source: Biesiekierski JR. 2017)
Currently, the main ways to produce hypoallergenic wheat products are through breeding and food processing technologies. Breeding techniques are used to reduce gluten toxicity at the source, while food processing techniques are used to inactivate or destroy antigenic epitopes physically, chemically, enzymatically, etc., thereby reducing the allergenicity of the protein. For example, some researchers have treated wheat by gradient polishing and obtained wheat proteins with reduced IgE binding capacity. In addition, the immunogenicity of gluten proteins associated with celiac disease can be blocked using the transglutaminase transglutamylation.
References
1. Pourmohammadi K, et al. Gliadin and glutenin genomes and their effects on the technological aspect of wheat-based products. Curr Res Food Sci. 2023 Oct 28;7:100622.
2. Biesiekierski JR. What is gluten? J Gastroenterol Hepatol. 2017 Mar;32 Suppl 1:78-81.
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References
Exercise-induced allergic reactions on desensitization to wheat after rush oral immunotherapy
Background The effect of oral immunotherapy (OIT) on wheat allergy is promising in terms of the potential to obtain desensitization; however, the frequency of exercise-induced allergic reactions on desensitization (EIARDs) and the associated risk factors remain to be determined. Methods Twenty-five patients underwent rush OIT for wheat allergy, and 21 achieved the full-dose intake of wheat products (5 g of wheat protein). Exercise-provocation tests were repeatedly performed after the ingestion of a full-dose wheat product. The time-course of the levels of the specific IgEs (sIgE) to wheat extract, total gliadin, deamidated gliadin, recombinant gliadin components (alpha/beta-, gamma- and omega-5-), and glutenin (high and low molecular weight) components was analyzed using ImmunoCAP (R), ELISA, or IgE immunoblotting. Results Fourteen patients (66.7%) were diagnosed as EIARD+, which remained 5 years after rush OIT in 11 patients (52.4%). There were no differences in the clinical backgrounds of the EIARD+ and EIARD- patients. However, EIARD+ patients showed significantly higher sIgE levels to all gliadin and glutenin components than EIARD- patients before OIT. The sIgE levels to each component decreased equally after 1 and 2 years of OIT. On IgE immunoblotting, sera from all patients reacted to the multiple gluten bands, and some reacted to the water-soluble bands. The intensity of all IgE-reactive bands also became equally lighter after OIT. Conclusions EIARDs were frequently observed and remained for a long period after successful OIT for wheat allergy. None of the specific wheat components were found to contribute to EIARDs.
Understanding the air-water interfacial behavior of suspensions of wheat gliadin nanoparticles
FOOD HYDROCOLLOIDS
Authors: Wouters, Arno G. B.; Joye, Iris J.; Delcour, Jan A.
The low solubility of many plant proteins (such as those of cereals) is a main obstacle preventing their use for stabilizing food foams and emulsions. Protein based nanoparticle suspensions hold promise for stabilizing such systems. Here, we shed light on how wheat gliadin based nanoparticles (WGNPs) behave at air-water interfaces, which at present remains largely unknown. At pH 4.0 and pH 6.0, WGNPs display very poor and excellent foam stability and result in interfacial films with low and high visco-elasticity, respectively. Fourier Transform InfraRed and fluorescence spectroscopy revealed substantial differences neither in structural nor in surface properties of WGNPs, nor in WGNP morphology at varying pH values ranging between 4.0 and 6.0, implying that the differences in interfacial behavior originate at the interface during or after adsorption of WGNPs. Cryo scanning electron microscopy imaging of foams stabilized by WGNPs showed that at pH 4.0 and pH 6.0 NP-like structures and a more coherent film are present at the interface, respectively. This is consistent with the higher visco-elasticity of adsorbed interfacial films at pH 6.0 than that at pH 4.0. Foam fractionation revealed that proteins in foams produced at pH 6.0 contain a substantial amount of intermolecular disulfide bonds. Thus, the excellent foam stability of WGNPs at pH 6.0 may at least to some extent be ascribed to formation of a covalently cross-linked protein network at the air-water interface.
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Figure 1. Approximate breakdown of wheat components
