TY  - JOUR
AU  - Prodić, Ivana
AU  - Smiljanić, Katarina
AU  - Nagl, Christoph
AU  - Ballmer-Weber, Barbara
AU  - Hoffmann-Sommergruber, Karin
AU  - Ćirković-Veličković, Tanja
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5653
AB  - Most of the food allergens sensitized via the gastrointestinal tract resist thermal treatments and digestion, particularly digestion by pepsin. Roasted hazelnuts are more commonly consumed than raw ones. Since no studies have characterized gastric digestion protein fragments of raw and roasted hazelnuts nor their IgE binding properties, we compared these aspects of raw and roasted hazelnuts’ gastric digesta obtained by INFOGEST protocol. Their electrophoretically resolved profiles were probed with hazelnut allergic patients’ sera in 1D and 2D immunoblots. Electrophoretic profiles demonstrated pepsin digestion of all hazelnut allergens to varying extents. While 2D immunoblots indicated that roasting slightly reduced allergenicity, IgE ELISA with the pool of sera showed a slight significant (10%) increase in IgE binding in both gastric digesta. Cor a 9 isolated from the raw and roasted hazelnuts, characterized by far and near CD, remained stable after roasting, with preserved IgE reactivity. Its immunoreactivity contribution by inhibitory ELISA was noticeable in raw and roasted hazelnut digesta; its activity was slightly stronger in the roasted preparations. Roasting has a visible impact on proteins; however, it did not affect overall IgE reactivity. Gastric digestion slightly increases the overall IgE reactivity in raw and roasted hazelnuts, and may therefore impact the profiles of allergens and their fragments available to interact with the immune system in the small intestine. © 2022 by the authors.
PB  - MDPI
T2  - Foods
T1  - INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity
VL  - 11
SP  - 2914
DO  - 10.3390/foods11182914
ER  - 

@article{
author = "Prodić, Ivana and Smiljanić, Katarina and Nagl, Christoph and Ballmer-Weber, Barbara and Hoffmann-Sommergruber, Karin and Ćirković-Veličković, Tanja",
year = "2022",
abstract = "Most of the food allergens sensitized via the gastrointestinal tract resist thermal treatments and digestion, particularly digestion by pepsin. Roasted hazelnuts are more commonly consumed than raw ones. Since no studies have characterized gastric digestion protein fragments of raw and roasted hazelnuts nor their IgE binding properties, we compared these aspects of raw and roasted hazelnuts’ gastric digesta obtained by INFOGEST protocol. Their electrophoretically resolved profiles were probed with hazelnut allergic patients’ sera in 1D and 2D immunoblots. Electrophoretic profiles demonstrated pepsin digestion of all hazelnut allergens to varying extents. While 2D immunoblots indicated that roasting slightly reduced allergenicity, IgE ELISA with the pool of sera showed a slight significant (10%) increase in IgE binding in both gastric digesta. Cor a 9 isolated from the raw and roasted hazelnuts, characterized by far and near CD, remained stable after roasting, with preserved IgE reactivity. Its immunoreactivity contribution by inhibitory ELISA was noticeable in raw and roasted hazelnut digesta; its activity was slightly stronger in the roasted preparations. Roasting has a visible impact on proteins; however, it did not affect overall IgE reactivity. Gastric digestion slightly increases the overall IgE reactivity in raw and roasted hazelnuts, and may therefore impact the profiles of allergens and their fragments available to interact with the immune system in the small intestine. © 2022 by the authors.",
publisher = "MDPI",
journal = "Foods",
title = "INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity",
volume = "11",
pages = "2914",
doi = "10.3390/foods11182914"
}

Prodić, I., Smiljanić, K., Nagl, C., Ballmer-Weber, B., Hoffmann-Sommergruber, K.,& Ćirković-Veličković, T.. (2022). INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity. in Foods
MDPI., 11, 2914.
https://doi.org/10.3390/foods11182914

Prodić I, Smiljanić K, Nagl C, Ballmer-Weber B, Hoffmann-Sommergruber K, Ćirković-Veličković T. INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity. in Foods. 2022;11:2914.
doi:10.3390/foods11182914 .

Prodić, Ivana, Smiljanić, Katarina, Nagl, Christoph, Ballmer-Weber, Barbara, Hoffmann-Sommergruber, Karin, Ćirković-Veličković, Tanja, "INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity" in Foods, 11 (2022):2914,
https://doi.org/10.3390/foods11182914 . .

TY  - DATA
AU  - Prodić, Ivana
AU  - Smiljanić, Katarina
AU  - Nagl, Christoph
AU  - Ballmer-Weber, Barbara
AU  - Hoffmann-Sommergruber, Karin
AU  - Ćirković-Veličković, Tanja
PY  - 2022
UR  - https://doi.org/10.3390/foods11182914
AB  - Most of the food allergens sensitized via the gastrointestinal tract resist thermal treatments and digestion, particularly digestion by pepsin. Roasted hazelnuts are more commonly consumed than raw ones. Since no studies have characterized gastric digestion protein fragments of raw and roasted hazelnuts nor their IgE binding properties, we compared these aspects of raw and roasted hazelnuts’ gastric digesta obtained by INFOGEST protocol. Their electrophoretically resolved profiles were probed with hazelnut allergic patients’ sera in 1D and 2D immunoblots. Electrophoretic profiles demonstrated pepsin digestion of all hazelnut allergens to varying extents. While 2D immunoblots indicated that roasting slightly reduced allergenicity, IgE ELISA with the pool of sera showed a slight significant (10%) increase in IgE binding in both gastric digesta. Cor a 9 isolated from the raw and roasted hazelnuts, characterized by far and near CD, remained stable after roasting, with preserved IgE reactivity. Its immunoreactivity contribution by inhibitory ELISA was noticeable in raw and roasted hazelnut digesta; its activity was slightly stronger in the roasted preparations. Roasting has a visible impact on proteins; however, it did not affect overall IgE reactivity. Gastric digestion slightly increases the overall IgE reactivity in raw and roasted hazelnuts, and may therefore impact the profiles of allergens and their fragments available to interact with the immune system in the small intestine. © 2022 by the authors.
PB  - MDPI
T2  - Foods
T1  - Supplementary material for:Prodić, I., Smiljanić, K., Nagl, C., Ballmer-Weber, B., Hoffmann-Sommergruber, K.,& Ćirković-Veličković, T.. (2022). INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity. in Foods MDPI., 11, 2914. https://doi.org/10.3390/foods11182914
VL  - 11
SP  - 2914
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5657
ER  - 

@misc{
author = "Prodić, Ivana and Smiljanić, Katarina and Nagl, Christoph and Ballmer-Weber, Barbara and Hoffmann-Sommergruber, Karin and Ćirković-Veličković, Tanja",
year = "2022",
abstract = "Most of the food allergens sensitized via the gastrointestinal tract resist thermal treatments and digestion, particularly digestion by pepsin. Roasted hazelnuts are more commonly consumed than raw ones. Since no studies have characterized gastric digestion protein fragments of raw and roasted hazelnuts nor their IgE binding properties, we compared these aspects of raw and roasted hazelnuts’ gastric digesta obtained by INFOGEST protocol. Their electrophoretically resolved profiles were probed with hazelnut allergic patients’ sera in 1D and 2D immunoblots. Electrophoretic profiles demonstrated pepsin digestion of all hazelnut allergens to varying extents. While 2D immunoblots indicated that roasting slightly reduced allergenicity, IgE ELISA with the pool of sera showed a slight significant (10%) increase in IgE binding in both gastric digesta. Cor a 9 isolated from the raw and roasted hazelnuts, characterized by far and near CD, remained stable after roasting, with preserved IgE reactivity. Its immunoreactivity contribution by inhibitory ELISA was noticeable in raw and roasted hazelnut digesta; its activity was slightly stronger in the roasted preparations. Roasting has a visible impact on proteins; however, it did not affect overall IgE reactivity. Gastric digestion slightly increases the overall IgE reactivity in raw and roasted hazelnuts, and may therefore impact the profiles of allergens and their fragments available to interact with the immune system in the small intestine. © 2022 by the authors.",
publisher = "MDPI",
journal = "Foods",
title = "Supplementary material for:Prodić, I., Smiljanić, K., Nagl, C., Ballmer-Weber, B., Hoffmann-Sommergruber, K.,& Ćirković-Veličković, T.. (2022). INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity. in Foods MDPI., 11, 2914. https://doi.org/10.3390/foods11182914",
volume = "11",
pages = "2914",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5657"
}

Prodić, I., Smiljanić, K., Nagl, C., Ballmer-Weber, B., Hoffmann-Sommergruber, K.,& Ćirković-Veličković, T.. (2022). Supplementary material for:Prodić, I., Smiljanić, K., Nagl, C., Ballmer-Weber, B., Hoffmann-Sommergruber, K.,& Ćirković-Veličković, T.. (2022). INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity. in Foods MDPI., 11, 2914. https://doi.org/10.3390/foods11182914. in Foods
MDPI., 11, 2914.
https://hdl.handle.net/21.15107/rcub_cherry_5657

Prodić I, Smiljanić K, Nagl C, Ballmer-Weber B, Hoffmann-Sommergruber K, Ćirković-Veličković T. Supplementary material for:Prodić, I., Smiljanić, K., Nagl, C., Ballmer-Weber, B., Hoffmann-Sommergruber, K.,& Ćirković-Veličković, T.. (2022). INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity. in Foods MDPI., 11, 2914. https://doi.org/10.3390/foods11182914. in Foods. 2022;11:2914.
https://hdl.handle.net/21.15107/rcub_cherry_5657 .

Prodić, Ivana, Smiljanić, Katarina, Nagl, Christoph, Ballmer-Weber, Barbara, Hoffmann-Sommergruber, Karin, Ćirković-Veličković, Tanja, "Supplementary material for:Prodić, I., Smiljanić, K., Nagl, C., Ballmer-Weber, B., Hoffmann-Sommergruber, K.,& Ćirković-Veličković, T.. (2022). INFOGEST Digestion Assay of Raw and Roasted Hazelnuts and Its Impact on Allergens and Their IgE Binding Activity. in Foods MDPI., 11, 2914. https://doi.org/10.3390/foods11182914" in Foods, 11 (2022):2914,
https://hdl.handle.net/21.15107/rcub_cherry_5657 .

TY  - CONF
AU  - Prodić, Ivana
AU  - Smiljanić, Katarina
AU  - Nagl, Christoph
AU  - Hoffmann-Sommergruber, Karin
AU  - Ćirković-Veličković, Tanja
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5762
AB  - Cor a 8 is a relevant allergen that can cause severe allergic reactions. It is a 115 amino acid protein with a molecular mass of 9 kDa and is a member of the non-specific lipida transfer protein family. This allergen is resistant to high temperatures, pH changes, gastric and intestinal enzymes. The main route of exposure is through ingestion. In order to examine its resistance to digestion, we have applied a popular 1.0 INFOGEST protocol [1], specialized for the complete food, which in vitro mimics physiologically relevant conditions of oral-gastric-intestinal digestion. The aim of this study was to compare Cor a 8 resistance to gastric digestion, from both, raw and roasted hazelnuts, before and upon pepsin (gastric) digestion. Stability of the Cor a 8 protein was investigated by simulation of oral and gastric digestion phases, performed with ground raw and roasted hazelnut kernels. Hazelnut proteins were extracted from the digestion mixture and analyzed by 1D and 2D SDS-PAGE, while raw and roasted Cor a 8 western blots were probed with specific anti-Cor a 8 antibodies in 1D and 2D immunoblots. The electrophoretic patterns of the raw and roasted extracts were similar. 1D SDS PAGE profiles demonstrated high stability of Cor a 8 against enzymatic treatments. Control samples of Cor a 8 from raw and roasted hazelnut extracts migrated as a single band at around 12 kDa in 1D immunoblot. However, in case of roasted hazelnut, the protein showed a slightly lower capacity to bind specific anti-Cor a 8 antibody, as compared to raw hazelnut extract. In 2D immunoblot, with higher resolution, specific antibody binding was decting a significant and noticeable smear in the basic region indicating a range of different protein variants. This was more pronounced detectable in the case of roasted sample upon digestion, pointing to a mix of variants in this allergen batch. It has been suggested that the allergenicity of the Cor a 8 is almost insensitive to temperature. The allergen is stable even after digestion and roasting processes up to 140˚C. We hypothesize that a lipid-rich food matrix delays extraction of proteins, thereby delaying their gastrointestinal digestion, which may affect allergen sensitizing capacity and clinical symptoms.
PB  - Sociedade Portuguesa de Química
C3  - Book of Abstracts of the XXI EuroFoodChem Congress
T1  - Allergenicity assessment of Cor a 8 from raw and roasted hazelnut upon oral-gastric digestion phase of INFOGEST protocol
SP  - 126
EP  - 126
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5762
ER  - 

@conference{
author = "Prodić, Ivana and Smiljanić, Katarina and Nagl, Christoph and Hoffmann-Sommergruber, Karin and Ćirković-Veličković, Tanja",
year = "2021",
abstract = "Cor a 8 is a relevant allergen that can cause severe allergic reactions. It is a 115 amino acid protein with a molecular mass of 9 kDa and is a member of the non-specific lipida transfer protein family. This allergen is resistant to high temperatures, pH changes, gastric and intestinal enzymes. The main route of exposure is through ingestion. In order to examine its resistance to digestion, we have applied a popular 1.0 INFOGEST protocol [1], specialized for the complete food, which in vitro mimics physiologically relevant conditions of oral-gastric-intestinal digestion. The aim of this study was to compare Cor a 8 resistance to gastric digestion, from both, raw and roasted hazelnuts, before and upon pepsin (gastric) digestion. Stability of the Cor a 8 protein was investigated by simulation of oral and gastric digestion phases, performed with ground raw and roasted hazelnut kernels. Hazelnut proteins were extracted from the digestion mixture and analyzed by 1D and 2D SDS-PAGE, while raw and roasted Cor a 8 western blots were probed with specific anti-Cor a 8 antibodies in 1D and 2D immunoblots. The electrophoretic patterns of the raw and roasted extracts were similar. 1D SDS PAGE profiles demonstrated high stability of Cor a 8 against enzymatic treatments. Control samples of Cor a 8 from raw and roasted hazelnut extracts migrated as a single band at around 12 kDa in 1D immunoblot. However, in case of roasted hazelnut, the protein showed a slightly lower capacity to bind specific anti-Cor a 8 antibody, as compared to raw hazelnut extract. In 2D immunoblot, with higher resolution, specific antibody binding was decting a significant and noticeable smear in the basic region indicating a range of different protein variants. This was more pronounced detectable in the case of roasted sample upon digestion, pointing to a mix of variants in this allergen batch. It has been suggested that the allergenicity of the Cor a 8 is almost insensitive to temperature. The allergen is stable even after digestion and roasting processes up to 140˚C. We hypothesize that a lipid-rich food matrix delays extraction of proteins, thereby delaying their gastrointestinal digestion, which may affect allergen sensitizing capacity and clinical symptoms.",
publisher = "Sociedade Portuguesa de Química",
journal = "Book of Abstracts of the XXI EuroFoodChem Congress",
title = "Allergenicity assessment of Cor a 8 from raw and roasted hazelnut upon oral-gastric digestion phase of INFOGEST protocol",
pages = "126-126",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5762"
}

Prodić, I., Smiljanić, K., Nagl, C., Hoffmann-Sommergruber, K.,& Ćirković-Veličković, T.. (2021). Allergenicity assessment of Cor a 8 from raw and roasted hazelnut upon oral-gastric digestion phase of INFOGEST protocol. in Book of Abstracts of the XXI EuroFoodChem Congress
Sociedade Portuguesa de Química., 126-126.
https://hdl.handle.net/21.15107/rcub_cherry_5762

Prodić I, Smiljanić K, Nagl C, Hoffmann-Sommergruber K, Ćirković-Veličković T. Allergenicity assessment of Cor a 8 from raw and roasted hazelnut upon oral-gastric digestion phase of INFOGEST protocol. in Book of Abstracts of the XXI EuroFoodChem Congress. 2021;:126-126.
https://hdl.handle.net/21.15107/rcub_cherry_5762 .

Prodić, Ivana, Smiljanić, Katarina, Nagl, Christoph, Hoffmann-Sommergruber, Karin, Ćirković-Veličković, Tanja, "Allergenicity assessment of Cor a 8 from raw and roasted hazelnut upon oral-gastric digestion phase of INFOGEST protocol" in Book of Abstracts of the XXI EuroFoodChem Congress (2021):126-126,
https://hdl.handle.net/21.15107/rcub_cherry_5762 .