TY  - DATA
AU  - Gligorijević, Nikola
AU  - Lujić, Tamara
AU  - Mutić, Tamara
AU  - Vasović, Tamara
AU  - Aćimović, Jelena
AU  - de Guzman, Maria Krishna
AU  - Stanić-Vučinić, Dragana
AU  - Ćirković-Veličković, Tanja
PY  - 2024
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6469
AB  - Research data for the unpublished paper: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties. Densitometry analysis of ovalbumin band intensity after digestion in the presence of microplastics on SDS-PAGE gels.
T1  - Research data no. 2 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6469
ER  - 

@misc{
author = "Gligorijević, Nikola and Lujić, Tamara and Mutić, Tamara and Vasović, Tamara and Aćimović, Jelena and de Guzman, Maria Krishna and Stanić-Vučinić, Dragana and Ćirković-Veličković, Tanja",
year = "2024",
abstract = "Research data for the unpublished paper: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties. Densitometry analysis of ovalbumin band intensity after digestion in the presence of microplastics on SDS-PAGE gels.",
title = "Research data no. 2 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6469"
}

Gligorijević, N., Lujić, T., Mutić, T., Vasović, T., Aćimović, J., de Guzman, M. K., Stanić-Vučinić, D.,& Ćirković-Veličković, T.. (2024). Research data no. 2 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties. .
https://hdl.handle.net/21.15107/rcub_cherry_6469

Gligorijević N, Lujić T, Mutić T, Vasović T, Aćimović J, de Guzman MK, Stanić-Vučinić D, Ćirković-Veličković T. Research data no. 2 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties. 2024;.
https://hdl.handle.net/21.15107/rcub_cherry_6469 .

Gligorijević, Nikola, Lujić, Tamara, Mutić, Tamara, Vasović, Tamara, Aćimović, Jelena, de Guzman, Maria Krishna, Stanić-Vučinić, Dragana, Ćirković-Veličković, Tanja, "Research data no. 2 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties" (2024),
https://hdl.handle.net/21.15107/rcub_cherry_6469 .

TY  - DATA
AU  - Gligorijević, Nikola
AU  - Lujić, Tamara
AU  - Mutić, Tamara
AU  - Vasović, Tamara
AU  - de Guzman, Maria Krishna
AU  - Aćimović, Jelena
AU  - Stanić-Vučinić, Dragana
AU  - Ćirković-Veličković, Tanja
PY  - 2024
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6465
AB  - Data used for the analysis of pepsin interaction with polystyrene microplastic of 10 and 100 µm in size. Binding isotherms data were used for the construction of binding isotherms from which binding between pepsin and polystyrene microplastic was described. Structural features of pepsin in the presence of polystyrene were analysed by CD spectrometry and spectrofluorimetry.
T1  - Research data no. 1 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6465
ER  - 

@misc{
author = "Gligorijević, Nikola and Lujić, Tamara and Mutić, Tamara and Vasović, Tamara and de Guzman, Maria Krishna and Aćimović, Jelena and Stanić-Vučinić, Dragana and Ćirković-Veličković, Tanja",
year = "2024",
abstract = "Data used for the analysis of pepsin interaction with polystyrene microplastic of 10 and 100 µm in size. Binding isotherms data were used for the construction of binding isotherms from which binding between pepsin and polystyrene microplastic was described. Structural features of pepsin in the presence of polystyrene were analysed by CD spectrometry and spectrofluorimetry.",
title = "Research data no. 1 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6465"
}

Gligorijević, N., Lujić, T., Mutić, T., Vasović, T., de Guzman, M. K., Aćimović, J., Stanić-Vučinić, D.,& Ćirković-Veličković, T.. (2024). Research data no. 1 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties. .
https://hdl.handle.net/21.15107/rcub_cherry_6465

Gligorijević N, Lujić T, Mutić T, Vasović T, de Guzman MK, Aćimović J, Stanić-Vučinić D, Ćirković-Veličković T. Research data no. 1 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties. 2024;.
https://hdl.handle.net/21.15107/rcub_cherry_6465 .

Gligorijević, Nikola, Lujić, Tamara, Mutić, Tamara, Vasović, Tamara, de Guzman, Maria Krishna, Aćimović, Jelena, Stanić-Vučinić, Dragana, Ćirković-Veličković, Tanja, "Research data no. 1 for the manuscript: Ovalbumin interaction with polystyrene and polyethylene terephthalate microplastics alters its structural properties" (2024),
https://hdl.handle.net/21.15107/rcub_cherry_6465 .

TY  - DATA
AU  - de Guzman, Maria Krishna
AU  - Stanić-Vučinić, Dragana
AU  - Gligorijević, Nikola
AU  - Wimmer, Lukas
AU  - Gasparyan, Manvel
AU  - Lujić, Tamara
AU  - Vasović, Tamara
AU  - Dailey, Lea Ann
AU  - Van Haute, Sam
AU  - Ćirković-Veličković, Tanja
PY  - 2023
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6463
AB  - The analysis of structural changes of pepsin in the presence of polystyrene microplastic of 10 and 100 µm in size in simulated gastric fluid. Data obtained from J-815 CD spectropolarimeter, and further analyzed by Origin and Excel software.
T2  - Environmental Pollution
T1  - Research data for: Krishna de Guzman, M., Stanić-Vučinić, D., Gligorijević, N., Wimmer, L., Gasparyan, M., Lujić, T., Vasović, T., Dailey, L. A., Van Haute, S.,& Ćirković-Veličković, T.. (2023). Small polystyrene microplastics interfere with the breakdown of milk proteins during static in vitro simulated human gastric digestion. in Environmental Pollution Elsevier., 335, 122282. https://doi.org/10.1016/j.envpol.2023.122282
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6463
ER  - 

@misc{
author = "de Guzman, Maria Krishna and Stanić-Vučinić, Dragana and Gligorijević, Nikola and Wimmer, Lukas and Gasparyan, Manvel and Lujić, Tamara and Vasović, Tamara and Dailey, Lea Ann and Van Haute, Sam and Ćirković-Veličković, Tanja",
year = "2023",
abstract = "The analysis of structural changes of pepsin in the presence of polystyrene microplastic of 10 and 100 µm in size in simulated gastric fluid. Data obtained from J-815 CD spectropolarimeter, and further analyzed by Origin and Excel software.",
journal = "Environmental Pollution",
title = "Research data for: Krishna de Guzman, M., Stanić-Vučinić, D., Gligorijević, N., Wimmer, L., Gasparyan, M., Lujić, T., Vasović, T., Dailey, L. A., Van Haute, S.,& Ćirković-Veličković, T.. (2023). Small polystyrene microplastics interfere with the breakdown of milk proteins during static in vitro simulated human gastric digestion. in Environmental Pollution Elsevier., 335, 122282. https://doi.org/10.1016/j.envpol.2023.122282",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6463"
}

de Guzman, M. K., Stanić-Vučinić, D., Gligorijević, N., Wimmer, L., Gasparyan, M., Lujić, T., Vasović, T., Dailey, L. A., Van Haute, S.,& Ćirković-Veličković, T.. (2023). Research data for: Krishna de Guzman, M., Stanić-Vučinić, D., Gligorijević, N., Wimmer, L., Gasparyan, M., Lujić, T., Vasović, T., Dailey, L. A., Van Haute, S.,& Ćirković-Veličković, T.. (2023). Small polystyrene microplastics interfere with the breakdown of milk proteins during static in vitro simulated human gastric digestion. in Environmental Pollution Elsevier., 335, 122282. https://doi.org/10.1016/j.envpol.2023.122282. in Environmental Pollution.
https://hdl.handle.net/21.15107/rcub_cherry_6463

de Guzman MK, Stanić-Vučinić D, Gligorijević N, Wimmer L, Gasparyan M, Lujić T, Vasović T, Dailey LA, Van Haute S, Ćirković-Veličković T. Research data for: Krishna de Guzman, M., Stanić-Vučinić, D., Gligorijević, N., Wimmer, L., Gasparyan, M., Lujić, T., Vasović, T., Dailey, L. A., Van Haute, S.,& Ćirković-Veličković, T.. (2023). Small polystyrene microplastics interfere with the breakdown of milk proteins during static in vitro simulated human gastric digestion. in Environmental Pollution Elsevier., 335, 122282. https://doi.org/10.1016/j.envpol.2023.122282. in Environmental Pollution. 2023;.
https://hdl.handle.net/21.15107/rcub_cherry_6463 .

de Guzman, Maria Krishna, Stanić-Vučinić, Dragana, Gligorijević, Nikola, Wimmer, Lukas, Gasparyan, Manvel, Lujić, Tamara, Vasović, Tamara, Dailey, Lea Ann, Van Haute, Sam, Ćirković-Veličković, Tanja, "Research data for: Krishna de Guzman, M., Stanić-Vučinić, D., Gligorijević, N., Wimmer, L., Gasparyan, M., Lujić, T., Vasović, T., Dailey, L. A., Van Haute, S.,& Ćirković-Veličković, T.. (2023). Small polystyrene microplastics interfere with the breakdown of milk proteins during static in vitro simulated human gastric digestion. in Environmental Pollution Elsevier., 335, 122282. https://doi.org/10.1016/j.envpol.2023.122282" in Environmental Pollution (2023),
https://hdl.handle.net/21.15107/rcub_cherry_6463 .

TY  - JOUR
AU  - de Guzman, Maria Krishna
AU  - Anđelković, Mirjana
AU  - Jovanović, Vesna B.
AU  - Jung, Jaehak
AU  - Kim, Juyang
AU  - Dailey, Lea Ann
AU  - Rajković, Andreja
AU  - De Meulenaer, Bruno
AU  - Ćirković-Veličković, Tanja
PY  - 2022
UR  - http://hdl.handle.net/1854/LU-8759702
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5420
AB  - The accumulation of microplastics in marine organisms is an emerging concern. Due to trophic transfer, the
safety of seafood is under investigation in view of the potential negative effects of microplastics on human health.
In this study, market samples of Manila clams (Ruditapes philippinarum) from South Korea were segregated into
two groups of considerably different size (p < 0.05), namely small clams with shell length of 40.69 ± 3.97 mm,
and large clams of shell length 51.19 ± 2.86 mm. Comparative profiling of the number, size, shape, and polymer
type of microplastics were performed using μFTIR imaging and Nile red staining. Overall, μFTIR detected only
1559 microplastics while 1996 microplastics were counted based on staining from 61 Manila clams (30 small and
31 large), leading to an overestimation of 18 to 75 %. Comparable microplastics concentration, based on μFTIR,
were observed at 2.70 ± 1.66 MP/g or 15.64 ± 9.25 MP/individual for the small samples, and 3.65 ± 1.59 MP/g
or 41.63 ± 16.90 MP/individual for the large ones (p > 0.05). Particle diameters of 20–100 μm was the most
dominant, accounting for 44.6 % and 46.5 % of all microplastics from the small and large groups, respectively.
Particles, with a circularity (resemblance to a circle) value between 0.6 and 1.0, were the most prevalent, fol-
lowed by fragments and fibers. At least 50 % of microplastics from the small and large samples were polystyrene,
making it the most abundant polymer type. Despite the substantial difference in the size of the animals, only a
weak to moderate correlation was observed between microplastics content and the physical attributes of the
clams such as shell length and weight, (soft) tissue weight, and total weight (Spearman's coefficient < 0.5). The
estimated intake of microplastics by the Korean population was 1232 MP/person/year via small clams, 1663 MP/
person/year via large clams, and 1489 MP/person/year via clams independent of size.
PB  - Elsevier
T2  - Marine Pollution Bulletin
T1  - Comparative profiling and exposure assessment of microplastics in differently sized Manila clams from South Korea by μFTIR and Nile Red staining
VL  - 181
SP  - 113846
DO  - 10.1016/j.marpolbul.2022.113846
ER  - 

@article{
author = "de Guzman, Maria Krishna and Anđelković, Mirjana and Jovanović, Vesna B. and Jung, Jaehak and Kim, Juyang and Dailey, Lea Ann and Rajković, Andreja and De Meulenaer, Bruno and Ćirković-Veličković, Tanja",
year = "2022",
abstract = "The accumulation of microplastics in marine organisms is an emerging concern. Due to trophic transfer, the
safety of seafood is under investigation in view of the potential negative effects of microplastics on human health.
In this study, market samples of Manila clams (Ruditapes philippinarum) from South Korea were segregated into
two groups of considerably different size (p < 0.05), namely small clams with shell length of 40.69 ± 3.97 mm,
and large clams of shell length 51.19 ± 2.86 mm. Comparative profiling of the number, size, shape, and polymer
type of microplastics were performed using μFTIR imaging and Nile red staining. Overall, μFTIR detected only
1559 microplastics while 1996 microplastics were counted based on staining from 61 Manila clams (30 small and
31 large), leading to an overestimation of 18 to 75 %. Comparable microplastics concentration, based on μFTIR,
were observed at 2.70 ± 1.66 MP/g or 15.64 ± 9.25 MP/individual for the small samples, and 3.65 ± 1.59 MP/g
or 41.63 ± 16.90 MP/individual for the large ones (p > 0.05). Particle diameters of 20–100 μm was the most
dominant, accounting for 44.6 % and 46.5 % of all microplastics from the small and large groups, respectively.
Particles, with a circularity (resemblance to a circle) value between 0.6 and 1.0, were the most prevalent, fol-
lowed by fragments and fibers. At least 50 % of microplastics from the small and large samples were polystyrene,
making it the most abundant polymer type. Despite the substantial difference in the size of the animals, only a
weak to moderate correlation was observed between microplastics content and the physical attributes of the
clams such as shell length and weight, (soft) tissue weight, and total weight (Spearman's coefficient < 0.5). The
estimated intake of microplastics by the Korean population was 1232 MP/person/year via small clams, 1663 MP/
person/year via large clams, and 1489 MP/person/year via clams independent of size.",
publisher = "Elsevier",
journal = "Marine Pollution Bulletin",
title = "Comparative profiling and exposure assessment of microplastics in differently sized Manila clams from South Korea by μFTIR and Nile Red staining",
volume = "181",
pages = "113846",
doi = "10.1016/j.marpolbul.2022.113846"
}

de Guzman, M. K., Anđelković, M., Jovanović, V. B., Jung, J., Kim, J., Dailey, L. A., Rajković, A., De Meulenaer, B.,& Ćirković-Veličković, T.. (2022). Comparative profiling and exposure assessment of microplastics in differently sized Manila clams from South Korea by μFTIR and Nile Red staining. in Marine Pollution Bulletin
Elsevier., 181, 113846.
https://doi.org/10.1016/j.marpolbul.2022.113846

de Guzman MK, Anđelković M, Jovanović VB, Jung J, Kim J, Dailey LA, Rajković A, De Meulenaer B, Ćirković-Veličković T. Comparative profiling and exposure assessment of microplastics in differently sized Manila clams from South Korea by μFTIR and Nile Red staining. in Marine Pollution Bulletin. 2022;181:113846.
doi:10.1016/j.marpolbul.2022.113846 .

de Guzman, Maria Krishna, Anđelković, Mirjana, Jovanović, Vesna B., Jung, Jaehak, Kim, Juyang, Dailey, Lea Ann, Rajković, Andreja, De Meulenaer, Bruno, Ćirković-Veličković, Tanja, "Comparative profiling and exposure assessment of microplastics in differently sized Manila clams from South Korea by μFTIR and Nile Red staining" in Marine Pollution Bulletin, 181 (2022):113846,
https://doi.org/10.1016/j.marpolbul.2022.113846 . .

TY  - JOUR
AU  - Ćirković-Veličković, Tanja
AU  - Park, Ho-Min
AU  - de Guzman, Maria Krishna
AU  - de Neve, Wesley
AU  - Van Messem, Arnout
AU  - Baek, Ji Yeon
AU  - Park, Sanghyeon
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5733
AB  - Environmental monitoring of microplastics (MP) contamination has become an area of great research interest, given potential hazards associated with human ingestion of MP. In this context, determination of MP concentration is essential. However, cheap, rapid, and accurate quantification of MP remains a challenge to this date. This study proposes a deep learning-based image segmentation method that properly distinguishes fluorescent MP from other elements in a given microscopy image. A total of nine different deep learning models, six of which are based on U-Net, were investigated. These models were trained using at least 20,000 patches sampled from 99 fluorescence microscopy images of MP and their corresponding binary masks. MP-Net, which is derived from U-Net, was found to be the best performing model, exhibiting the highest mean F1-score (0.736) and mean IoU value (0.617). Test-time augmentation (using brightness, contrast, and HSV) was applied to MP-Net for robust learning. However, compared to the results obtained without augmentation, no clear improvement in predictive performance could be observed. Recovery assessment for both spiked and real images showed that, compared to already existing tools for MP quantification, the MP quantities predicted by MP-Net are those closest to the ground truth. This observation suggests that MP-Net allows creating masks that more accurately reflect the quantitative presence of fluorescent MP in microscopy images. Finally, MAP (Microplastics Annotation Package) is introduced, an integrated software environment for automated MP quantification, offering support for MP-Net, already existing MP analysis tools like MP-VAT, manual annotation, and model fine-tuning.
PB  - Public Library of Science
T2  - PLoS ONE
T1  - MP-Net: Deep learning-based segmentation for fluorescence microscopy images of microplastics isolated from clams
VL  - 17
IS  - 6
SP  - e0269449
DO  - 10.1371/journal.pone.0269449
ER  - 

@article{
author = "Ćirković-Veličković, Tanja and Park, Ho-Min and de Guzman, Maria Krishna and de Neve, Wesley and Van Messem, Arnout and Baek, Ji Yeon and Park, Sanghyeon",
year = "2022",
abstract = "Environmental monitoring of microplastics (MP) contamination has become an area of great research interest, given potential hazards associated with human ingestion of MP. In this context, determination of MP concentration is essential. However, cheap, rapid, and accurate quantification of MP remains a challenge to this date. This study proposes a deep learning-based image segmentation method that properly distinguishes fluorescent MP from other elements in a given microscopy image. A total of nine different deep learning models, six of which are based on U-Net, were investigated. These models were trained using at least 20,000 patches sampled from 99 fluorescence microscopy images of MP and their corresponding binary masks. MP-Net, which is derived from U-Net, was found to be the best performing model, exhibiting the highest mean F1-score (0.736) and mean IoU value (0.617). Test-time augmentation (using brightness, contrast, and HSV) was applied to MP-Net for robust learning. However, compared to the results obtained without augmentation, no clear improvement in predictive performance could be observed. Recovery assessment for both spiked and real images showed that, compared to already existing tools for MP quantification, the MP quantities predicted by MP-Net are those closest to the ground truth. This observation suggests that MP-Net allows creating masks that more accurately reflect the quantitative presence of fluorescent MP in microscopy images. Finally, MAP (Microplastics Annotation Package) is introduced, an integrated software environment for automated MP quantification, offering support for MP-Net, already existing MP analysis tools like MP-VAT, manual annotation, and model fine-tuning.",
publisher = "Public Library of Science",
journal = "PLoS ONE",
title = "MP-Net: Deep learning-based segmentation for fluorescence microscopy images of microplastics isolated from clams",
volume = "17",
number = "6",
pages = "e0269449",
doi = "10.1371/journal.pone.0269449"
}

Ćirković-Veličković, T., Park, H., de Guzman, M. K., de Neve, W., Van Messem, A., Baek, J. Y.,& Park, S.. (2022). MP-Net: Deep learning-based segmentation for fluorescence microscopy images of microplastics isolated from clams. in PLoS ONE
Public Library of Science., 17(6), e0269449.
https://doi.org/10.1371/journal.pone.0269449

Ćirković-Veličković T, Park H, de Guzman MK, de Neve W, Van Messem A, Baek JY, Park S. MP-Net: Deep learning-based segmentation for fluorescence microscopy images of microplastics isolated from clams. in PLoS ONE. 2022;17(6):e0269449.
doi:10.1371/journal.pone.0269449 .

Ćirković-Veličković, Tanja, Park, Ho-Min, de Guzman, Maria Krishna, de Neve, Wesley, Van Messem, Arnout, Baek, Ji Yeon, Park, Sanghyeon, "MP-Net: Deep learning-based segmentation for fluorescence microscopy images of microplastics isolated from clams" in PLoS ONE, 17, no. 6 (2022):e0269449,
https://doi.org/10.1371/journal.pone.0269449 . .

TY  - CONF
AU  - de Guzman, Maria Krishna
AU  - Wimmer, Lukas
AU  - Dailey, Lea Ann
AU  - Van Haute, Sam
AU  - Ćirković-Veličković, Tanja
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5908
AB  - The prevalence of microplastics (MP) pollution in
different zones of the environment has been
established by several studies [1]. Due to its
widespread presence, MP have found its way into
food items. Fish, shellfish, water, milk, salt, and
sugar are just some examples of the food we
commonly consume that are contaminated with MP
[2]. Human ingestion of MP is already well-established
but there is limited data regarding how
MP affect human gastric digestion of food
components, especially proteins.
In this study, we investigated the effects of
polystyrene (PS) MP on pepsin, the major protease
in human gastric digestion. Pepsin activity was
tested during exposure to two different sizes -10 μm
(PS10) and 100 μm (PS100), and three different
quantities- low count (142 particles), moderate
count (1420 particles), and high count
(14200 particles), of PS using haemoglobin as
substrate. Results showed that exposure to PS100
has no effect on enzyme activity. However,
exposure to high count PS10 considerably reduced
pepsin activity from 2957 ± 310 U/mg to 1674 ± 270
U/mg.
To test the effect on food digestion, high count
PS10 was added to a sample of commercially
available liquid bovine milk (defatted). In this case,
the static in vitro simulation of gastric digestion was
followed to mimic human digestion of food [3].
Milk digesta at different time points (5, 10, 15, 20,
30, 60, 90, 120 minutes) were obtained to monitor
the progress of protein degradation.
SDS-PAGE showed no difference in the peptide
bands from 30-120 minutes. However, bands
corresponding to caseins were not observed at 5
minutes when PS10 was present. Additionally,
14 kDa fragments were not observed at 10-20
minutes.
Washing of the PS particles followed by SDSPAGE
revealed a faint pepsin band from all time
points. At 5 and 10 minutes, faint peptide bands
>10kDa were also observed. These suggest that
pepsin and some milk peptides were adsorbed on
the surface of PS10. Zeta potential analysis of PS
revealed a slightly negative surface charge which
could explain the adsorption and disappearance of
peptide bands. This adsorption of pepsin on PS did
not seem to affect its overall protease activity.
However, the interaction of milk peptides with PS
may reduce the nutrients human could acquire from
milk.
Acknowledgements
This study was supported by Ghent University
Global Campus; Special Research Fund (BOF) of
Ghent University (grant number 01N01718) and
IMPTOX European Union’s Horizon 2020 research
and innovation program (grant number 965173).
References
[1] S. Sharma, S. Basu, N. P. Shetti, M. N. Nadagouda, T.
M. Aminabhavi (2021) Chem. Eng. J., 408, 127317.
[2] K. D. Cox, G. A. Covernton, H. L. Davies, J. F. Dower,
F. Juanes, S. E. Dudas (2019) Environ. Sci. Technol.,
53(12), 7068–7074.
[3] A. Brodkorb et al. (2019) Nat. Protoc., 14(4), 991–
1014.
PB  - University of Ljubljana Press
C3  - Book of Abstracts of the 22nd European Meeting on Environmental Chemistry, Ljubljana, Slovenia, 5-8 December 2022
T1  - Implications of Polystyrene Microplastics on the Gastric Digestion of Bovine Milk
SP  - 124
EP  - 124
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5908
ER  - 

@conference{
author = "de Guzman, Maria Krishna and Wimmer, Lukas and Dailey, Lea Ann and Van Haute, Sam and Ćirković-Veličković, Tanja",
year = "2022",
abstract = "The prevalence of microplastics (MP) pollution in
different zones of the environment has been
established by several studies [1]. Due to its
widespread presence, MP have found its way into
food items. Fish, shellfish, water, milk, salt, and
sugar are just some examples of the food we
commonly consume that are contaminated with MP
[2]. Human ingestion of MP is already well-established
but there is limited data regarding how
MP affect human gastric digestion of food
components, especially proteins.
In this study, we investigated the effects of
polystyrene (PS) MP on pepsin, the major protease
in human gastric digestion. Pepsin activity was
tested during exposure to two different sizes -10 μm
(PS10) and 100 μm (PS100), and three different
quantities- low count (142 particles), moderate
count (1420 particles), and high count
(14200 particles), of PS using haemoglobin as
substrate. Results showed that exposure to PS100
has no effect on enzyme activity. However,
exposure to high count PS10 considerably reduced
pepsin activity from 2957 ± 310 U/mg to 1674 ± 270
U/mg.
To test the effect on food digestion, high count
PS10 was added to a sample of commercially
available liquid bovine milk (defatted). In this case,
the static in vitro simulation of gastric digestion was
followed to mimic human digestion of food [3].
Milk digesta at different time points (5, 10, 15, 20,
30, 60, 90, 120 minutes) were obtained to monitor
the progress of protein degradation.
SDS-PAGE showed no difference in the peptide
bands from 30-120 minutes. However, bands
corresponding to caseins were not observed at 5
minutes when PS10 was present. Additionally,
14 kDa fragments were not observed at 10-20
minutes.
Washing of the PS particles followed by SDSPAGE
revealed a faint pepsin band from all time
points. At 5 and 10 minutes, faint peptide bands
>10kDa were also observed. These suggest that
pepsin and some milk peptides were adsorbed on
the surface of PS10. Zeta potential analysis of PS
revealed a slightly negative surface charge which
could explain the adsorption and disappearance of
peptide bands. This adsorption of pepsin on PS did
not seem to affect its overall protease activity.
However, the interaction of milk peptides with PS
may reduce the nutrients human could acquire from
milk.
Acknowledgements
This study was supported by Ghent University
Global Campus; Special Research Fund (BOF) of
Ghent University (grant number 01N01718) and
IMPTOX European Union’s Horizon 2020 research
and innovation program (grant number 965173).
References
[1] S. Sharma, S. Basu, N. P. Shetti, M. N. Nadagouda, T.
M. Aminabhavi (2021) Chem. Eng. J., 408, 127317.
[2] K. D. Cox, G. A. Covernton, H. L. Davies, J. F. Dower,
F. Juanes, S. E. Dudas (2019) Environ. Sci. Technol.,
53(12), 7068–7074.
[3] A. Brodkorb et al. (2019) Nat. Protoc., 14(4), 991–
1014.",
publisher = "University of Ljubljana Press",
journal = "Book of Abstracts of the 22nd European Meeting on Environmental Chemistry, Ljubljana, Slovenia, 5-8 December 2022",
title = "Implications of Polystyrene Microplastics on the Gastric Digestion of Bovine Milk",
pages = "124-124",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5908"
}

de Guzman, M. K., Wimmer, L., Dailey, L. A., Van Haute, S.,& Ćirković-Veličković, T.. (2022). Implications of Polystyrene Microplastics on the Gastric Digestion of Bovine Milk. in Book of Abstracts of the 22nd European Meeting on Environmental Chemistry, Ljubljana, Slovenia, 5-8 December 2022
University of Ljubljana Press., 124-124.
https://hdl.handle.net/21.15107/rcub_cherry_5908

de Guzman MK, Wimmer L, Dailey LA, Van Haute S, Ćirković-Veličković T. Implications of Polystyrene Microplastics on the Gastric Digestion of Bovine Milk. in Book of Abstracts of the 22nd European Meeting on Environmental Chemistry, Ljubljana, Slovenia, 5-8 December 2022. 2022;:124-124.
https://hdl.handle.net/21.15107/rcub_cherry_5908 .

de Guzman, Maria Krishna, Wimmer, Lukas, Dailey, Lea Ann, Van Haute, Sam, Ćirković-Veličković, Tanja, "Implications of Polystyrene Microplastics on the Gastric Digestion of Bovine Milk" in Book of Abstracts of the 22nd European Meeting on Environmental Chemistry, Ljubljana, Slovenia, 5-8 December 2022 (2022):124-124,
https://hdl.handle.net/21.15107/rcub_cherry_5908 .

TY  - CONF
AU  - Khulal, Urmila
AU  - Radomirović, Mirjana Ž.
AU  - de Guzman, Maria Krishna
AU  - Mutić, Jelena
AU  - Rajković, Andreja
AU  - Ćirković-Veličković, Tanja
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/6034
AB  - Tropomyosin (TM) is known to be a major shrimp allergen (e.g., Pen m 1) and considered a cross-reacting panallergen among shellfish/invertebrates. The clam TM is also considered its major allergen but has not been widely studied. The food processing techniques can alter the TM allergenicity. Hence, the objective of this research is to detect and quantify TM in fresh and differentially treated clams collected in Korea via in-house developed sandwich ELISA protocol to evaluate the effect of various real-life processing techniques on TM stability.
Freshly bought live clams (FC), 4 groups of randomly selected equal number of similarly sized clams were differentially treated. Fresh and packaged (FPC), fresh and frozen at -20◦C (FroC). The fresh clams boiled (BC) in boiling water and the marinated clams (MC) suspended in marinade solution for 5 days; soluble protein extracted overnight from 5 samples in PBS buffer with protease inhibitor; BCA assay determined the protein content; capture-detection-enzyme linked secondary antibody in-house ELISA. ELISA was validated with specific antibody based Western blot (WB).
The total soluble protein content of raw clams (FC, FPC, FroC) was between 2.8-4.9 mg/ml. The cooked clams (BC, MC) lost total protein during the cooking and was determined <1 mg/ml. The leaked protein in boiled water (BW) and marinade solution (MS) was confirmed with the protein assay as 0.48 mg/ml and 5.5 mg/ml, respectively. ELISA quantified TM (pg/ml) in FPC =BC (610) >FroC (290) >FC (75) >MC. It (and WB) showed that boiling has no effect on heat stable TM IgG binding, BW contained considerable amount of TM (with pronounced IgG binding). MC, however showed no TM epitope recognition in WB (no band in SDS PAGE) and was not quantified by ELISA nor in MS (<LLOQ). Marination might degrade the TM to significant extent possibly altering the allergenicity.
PB  - Belgrade : Faculty of Chemistry
C3  - FoodEnTwin Symposium “Novel analytical approaches in food and environmental sciences”, Belgrade, Serbia, 16th-18th June, 2021. In: Book of Abstracts
T1  - Detection and quantification of tropomyosin in differentially treated clams from Korea
SP  - 25
EP  - 25
UR  - https://hdl.handle.net/21.15107/rcub_cherry_6034
ER  - 

@conference{
author = "Khulal, Urmila and Radomirović, Mirjana Ž. and de Guzman, Maria Krishna and Mutić, Jelena and Rajković, Andreja and Ćirković-Veličković, Tanja",
year = "2021",
abstract = "Tropomyosin (TM) is known to be a major shrimp allergen (e.g., Pen m 1) and considered a cross-reacting panallergen among shellfish/invertebrates. The clam TM is also considered its major allergen but has not been widely studied. The food processing techniques can alter the TM allergenicity. Hence, the objective of this research is to detect and quantify TM in fresh and differentially treated clams collected in Korea via in-house developed sandwich ELISA protocol to evaluate the effect of various real-life processing techniques on TM stability.
Freshly bought live clams (FC), 4 groups of randomly selected equal number of similarly sized clams were differentially treated. Fresh and packaged (FPC), fresh and frozen at -20◦C (FroC). The fresh clams boiled (BC) in boiling water and the marinated clams (MC) suspended in marinade solution for 5 days; soluble protein extracted overnight from 5 samples in PBS buffer with protease inhibitor; BCA assay determined the protein content; capture-detection-enzyme linked secondary antibody in-house ELISA. ELISA was validated with specific antibody based Western blot (WB).
The total soluble protein content of raw clams (FC, FPC, FroC) was between 2.8-4.9 mg/ml. The cooked clams (BC, MC) lost total protein during the cooking and was determined <1 mg/ml. The leaked protein in boiled water (BW) and marinade solution (MS) was confirmed with the protein assay as 0.48 mg/ml and 5.5 mg/ml, respectively. ELISA quantified TM (pg/ml) in FPC =BC (610) >FroC (290) >FC (75) >MC. It (and WB) showed that boiling has no effect on heat stable TM IgG binding, BW contained considerable amount of TM (with pronounced IgG binding). MC, however showed no TM epitope recognition in WB (no band in SDS PAGE) and was not quantified by ELISA nor in MS (<LLOQ). Marination might degrade the TM to significant extent possibly altering the allergenicity.",
publisher = "Belgrade : Faculty of Chemistry",
journal = "FoodEnTwin Symposium “Novel analytical approaches in food and environmental sciences”, Belgrade, Serbia, 16th-18th June, 2021. In: Book of Abstracts",
title = "Detection and quantification of tropomyosin in differentially treated clams from Korea",
pages = "25-25",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6034"
}

Khulal, U., Radomirović, M. Ž., de Guzman, M. K., Mutić, J., Rajković, A.,& Ćirković-Veličković, T.. (2021). Detection and quantification of tropomyosin in differentially treated clams from Korea. in FoodEnTwin Symposium “Novel analytical approaches in food and environmental sciences”, Belgrade, Serbia, 16th-18th June, 2021. In: Book of Abstracts
Belgrade : Faculty of Chemistry., 25-25.
https://hdl.handle.net/21.15107/rcub_cherry_6034

Khulal U, Radomirović MŽ, de Guzman MK, Mutić J, Rajković A, Ćirković-Veličković T. Detection and quantification of tropomyosin in differentially treated clams from Korea. in FoodEnTwin Symposium “Novel analytical approaches in food and environmental sciences”, Belgrade, Serbia, 16th-18th June, 2021. In: Book of Abstracts. 2021;:25-25.
https://hdl.handle.net/21.15107/rcub_cherry_6034 .

Khulal, Urmila, Radomirović, Mirjana Ž., de Guzman, Maria Krishna, Mutić, Jelena, Rajković, Andreja, Ćirković-Veličković, Tanja, "Detection and quantification of tropomyosin in differentially treated clams from Korea" in FoodEnTwin Symposium “Novel analytical approaches in food and environmental sciences”, Belgrade, Serbia, 16th-18th June, 2021. In: Book of Abstracts (2021):25-25,
https://hdl.handle.net/21.15107/rcub_cherry_6034 .