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9. Electrochemical Detection of Cd 2+ , Pb 2+ , Cu 2+ and Hg 2+ with Sensors Based on Carbonaceous Nanomaterials and Fe 3 O 4 Nanoparticles.

Author

Dinu, Ancuța, Bounegru, Alexandra Virginia, Iticescu, Catalina, Georgescu, Lucian P., and Apetrei, Constantin

Subjects
*IRON oxide nanoparticles, *ANALYSIS of heavy metals, *COPPER, *METAL detectors, *WATER quality monitoring, *DETECTORS
Abstract

Two electrochemical sensors were developed in this study, with their preparations using two nanomaterials with remarkable properties, namely, carbon nanofibers (CNF) modified with Fe3O4 nanoparticles and multilayer carbon nanotubes (MWCNT) modified with Fe3O4 nanoparticles. The modified screen-printed electrodes (SPE) were thus named SPE/Fe3O4-CNF and SPE/Fe3O4-MWCNT and were used for the simultaneous detection of heavy metals (Cd2+, Pb2+, Cu2+ and Hg2+). The sensors have been spectrometrically and electrochemically characterized. The limits of detection of the SPE/Fe3O4-CNF sensor were 0.0615 μM, 0.0154 μM, 0.0320 μM and 0.0148 μM for Cd2+, Pb2+, Cu2+ and Hg2+, respectively, and 0.2719 μM, 0.3187 μM, 1.0436 μM and 0.9076 μM in the case of the SPE/ Fe3O4-MWCNT sensor (following optimization of the working parameters). Due to the modifying material, the results showed superior performance for the SPE/Fe3O4-CNF sensor, with extended linearity ranges and detection limits in the nanomolar range, compared to those of the SPE/Fe3O4-MWCNT sensor. For the quantification of heavy metal ions Cd2+, Pb2+, Cu2+ and Hg2+ with the SPE/Fe3O4-CNF sensor from real samples, the standard addition method was used because the values obtained for the recovery tests were good. The analysis of surface water samples from the Danube River has shown that the obtained values are significantly lower than the maximum limits allowed according to the quality standards specified by the United States Environmental Protection Agency (USEPA) and those of the World Health Organization (WHO). This research provides a complementary method based on electrochemical sensors for in situ monitoring of surface water quality, representing a useful tool in environmental studies. [ABSTRACT FROM AUTHOR]

Published
2024
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11. List of contributors

Author

Abalo, Raquel, Abdollahi, Milad, Abu-Samak, Mahmoud S., Adi Pinandito, Yohanes Krisnantyo, Agnoletti, Bárbara Z., Aguilar-González, Miguel A., Aguilar, Cristóbal N., Agunloye, Odunayo M., Akaffou, Sélastique, Alegret, Marta, Alves, Rita C., Amir, Muhammad Subhan, Andrade, Nelson, Apetrei, Constantin, Aprigio, Nícollas Gabriel de Oliveira, Asil, Esma, Awwad, Shady H., Barbisan, Luís Fernando, Barreto-Peixoto, Juliana A., Basaran, Burhan, Bastos-Filho, Teodiano, Beccari, Fabio, Berti, Federico, Bezandry, Rickarlos, Binello, Arianna, Blanco-Díaz, Cristian Felipe, Bodur, Mahmut, Bounegru, Alexandra Virginia, Bramantoro, Taufan, Branco, Ana F., Brancucci, Alfredo, Büschgens, Luca, Budán, Ferenc, Buyukkurt, Ozlem Kilic, Bytof, Gerhard, Cadwallader, Keith R., Cao, Chao, Caprioli, Giovanni, Celedón, Juan C., Cervera-Mata, Ana, Cesarino, Igor, Chagas, Patrícia, Chemello, Diego, Chmurzynska, Agata, Christianty, Fransiska Maria, Chávez González, Mónica L., Coimbra, Manuel A., Conde, Silvia V., Coreta-Gomes, Filipe, Couturon, Emmanuel, Cravotto, Giancarlo, Crouzillat, Dominique, Damiri, Basma, Dash, Dillip Kumar, da Silva, Maria Alice Esteves, da Silva, Michelle Costa, da Silva Junior, Ademário Iris, Delatour, Thierry, Delgado, Gabriel, de Oliveira, Marcos Roberto, de Podestá, Olívia Perim Galvão, de Rezende, Claudia Moraes, Desai, Nivas, de Souza, Tassio da Silva, de Souza Costa, Arthur Merigueti, Deus, Cláudia M., Diaz-Gómez, Rallinari, Domingues, Douglas Silva, do Prado, Camila Bruneli, Duarte-Correa, Yudy, Dubois, Mathieu, Dupeyron, Mathilde, Elbadry, Abdullah M.M., Elsaadani, Moez, Elsaadani, Muhamed, Eshak, Ehab, Ewa, Lange, Ewelina, Pałkowska-Goździk, Fajrin, Fifteen Aprila, Farah, Adriana, Fathi, Faezeh, Fernandes, Patrícia, Fernández-Arteaga, Alejandro, Ferreira, Helena, Ferreira, Thiago, Ferreira, Júlia Rabelo Santos, Ferrão, Maria Amélia Gava, Forzato, Cristina, Francis, Akintoye O., Frank, Oliver, Freitas, Jair C.C., Fuentes, Eduardo, Fukasawa, Masayoshi, Gallego-Barceló, Paula, Galluzzi, Maria Letícia, Gamal, Nermin, Garcia, Sergio Britto, Gigl, Michael, Goh, Rui Min Vivian, Grimm, Marcus Otto Walter, Guclu, Gamze, Guercia, Elena, Guerrero-Méndez, Cristian David, Guyot, Romain, Halim-Lim, Sarina Abdul, Hamon, Perla, Hamon, Serge, Han, Yueh-Ying, Hegde, Shrilakshmi, Herrera-Jácome, Darío Fernando, Hoang, Minh Hao, Huang, Yunle, Huang, Dejian, Hyppönen, Elina, Irmalia, Wahyuning Ratih, Iso, Hiroyasu, Ivamoto-Suzuki, Suzana Tiemi, Janitschke, Daniel, Jaramillo-Isaza, Sebastián, Jazayeri, Seyed Mehdi, Jazayeri, Reyhaneh Sadat, Jia, Huijuan, Jublot, Lionel, Kalthoff, Sandra, Kannen, Vinicius, Kaviani, Mojtaba, Kelebek, Hasim, Khairnar, Amit, Khat-udomkiri, Nuntawat, Kleinwächter, Maik, Kouchaksaraee, Reza M., Krismariono, Agung, Kronschläger, Martin, Kulapichitr, Fareeya, Laguna, Juan Carlos, Lang, Roman, Lani, Mohd Nizam, Lauer, Anna Andrea, Li, Xuguang, Lip, Gregory Y.H., Liu, Shao Quan, Loja, Pedro Darío Cedeño, Lyu, Weida, Macedo Brand, Ana Laura, Machado, Fernanda, Machado, Marlene, Maheshwari, Rajesh A., Manippa, Valerio, Maqboul, Iyad, Marandi, Sayyed Mohammad, Marinho, Daniele Alves, Martel, Fátima, Martins, Cleodice Alves, Martins, Fátima O., Mattioli, Anna Vittoria, Mazzafera, Paulo, Mohammad, Beisan, Morejon, Karen Rafaela Mayorga, MotieGhader, Habib, Máthé, Domokos, Munde, Manojkumar K., Murillo, Ricardo Augusto Luna, Murthy, Pushpa S., Myo, Hla, Navarini, Luciano, Netto, Annibal Duarte Pereira, Nguyen, Linh Nham, Noormohammadi, Haniyeh, Nugraha, Alexander Patera, Oboh, Ganiyu, Ogawa, Motohiko, Oliveira, Emanuele C.S., Oliveira, M. Beatriz P.P., Oliveira, Paulo J., Orjuela-Cañón, Alvaro David, Osorio-Arias, Juan Camilo, Oussou, Kouame Fulbert, Padulo, Caterina, Palomo, Iván, Pastoriza, Silvia, Patel, Vinood B., Pedroso, Andressa Bressan, Peerapen, Paleerath, Pereira, Luiz Filipe Protasio, Pham, Kitty, Pires, Luciana Bicalho Cevolani, Preedy, Victor R., Pua, Aileen, Raharimala, Nathalie Eva, Raharimalala, Nathalie Eva, Rajendram, Rajkumar, Ray, Aratrika, Retnowati, Wiwin, Rodríguez, Lyanne, Roglans, Núria, Romualdo, Guilherme Ribeiro, Ruelas-Chacón, Xóchitl, Rufián-Henares, José Ángel, Ruiss, Manuel, Ruiz-Olaya, Andrés Felipe, Sacramento, Joana F., Sagratini, Gianni, Salari, Solmaz, Salaroli, Luciane Bresciani, Sandoval-Cortes, José, Santanatoglia, Agnese, Santiago, Carmen, Sardão, Vilma A., Scherer, Rodrigo, Selli, Serkan, Selmar, Dirk, Sen, Dhanya B., Sen, Ashim Kumar, Sepúlveda, Magdalena, Shah, Jigna S., Sharma, Nishant, Shi, Xuan-Zheng, Shidqi, Alfisar, Shirkhani, Samaneh, Shooshtari, Maryam Sadat Beheshti, Smrke, Samo, Soni, Ritu, Sík, Attila, Strassburg, Christian P., Surma, Stanisław, Szabó, László, Szentpéteri, József L., Szép, Dávid, Tagliapietra, Silvia, Tanokura, Masaru, Tellería, Francisca, Teramoto, Masayuki, Theurillat, Viviane, Thongboonkerd, Visith, İlhan-Esgin, Merve, Torres-Valenzuela, Laura Sofia, Özbek, Yağmur Demirel, Valente, Letícia Cardoso, Villamar-Torres, Ronald Oswaldo, Vittori, Sauro, Vo, Thi Nga, Wan-Mohtar, Wan Abd Al Qadr Imad, Wang, Ruixuan, Wei, Feifei, Wirths, Oliver, Yang, Lin, Yeretzian, Chahan, Yılmaz, Mustafa Volkan, Yu, Bin, Zanin, Rodolfo Campos, Zidan, Thabet, and Zulfiana, Amalia Ayu

Published
2025
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15. Boron compounds: Challenges and Applications in food industry.

Author

Filimon, Veronica, Bounegru, Alexandra Virginia, and Butan, Simona

Abstract

Boron compounds have various industrial applications, including the food industry. The most common boron compounds used in the food industry are boric acid and borax, which are often used as food additives to improve the texture and stability of foods. There is also another boron compound called calcium fructoborate, which is a naturally occurring form of boron and is found in some fruits such as grapes and apples. Calcium fructoborate is a form of boron that is well absorbed by the body and may have health benefits, for instance to protect bones and to improve cognitive function. In the food industry, calcium fructoborate may be used as an ingredient in some food products to provide these health benefits. Food products containing calcium fructoborate may include beverages, dietary supplements, and functional foods such as protein foods and baked goods. There are also dietary supplements containing calcium fructoborate that are marketed as dietary supplements to support bone and joint health. The use of boron compounds in foods is established by regulatory agencies such as the Food and Drug Administration (FDA) in the United States and the European Food Safety Authority (EFSA) in Europe. These agencies set dosage limits and strict requirements for the safety of using boron compounds in foods. In conclusion, it is important to follow these regulations and to use boron compounds only in safe and the approved amounts. [ABSTRACT FROM AUTHOR]

Published
2023

24. Voltammetric Sensors Based on Nanomaterials for Detection of Caffeic Acid in Food Supplements.

Author

Bounegru, Alexandra Virginia and Apetrei, Constantin

Subjects
CAFFEIC acid, DIETARY supplements, VOLTAMMETRY, DETECTORS, NANOSTRUCTURED materials, CARBON nanotubes, CARBON nanofibers
Abstract

Caffeic acid may be accurately detected in food supplements by using cyclic voltammetry and carbon screen-printed sensors modified with various nanomaterials. Sensor characterization by cyclic voltammetry in reference solutions has shown that carbon nanotubes or carbon nanofibers significantly improve the sensor response in terms of sensitivity and reversibility. Screen-printed sensors were then used in order to study the electrochemical behavior of caffeic acid in aqueous solution at pH 3.6. A redox process was observed in all cases, which corresponds to a reversible redox process involving the transfer of two electrons and two protons. The role of nanomaterials in the increment of sensor performance characteristics was evidenced. Calibration curves were developed for each sensor, and the detection (LOD) and quantification (LOQ) limits were calculated. Low LOD and LOQ values were obtained, in the 10−7 to 10−9 M range, which demonstrates that the method is feasible for quantification of caffeic acid in real samples. Caffeic acid was quantitatively determined in three food supplements using the most sensitive sensor, namely the carbon nanofiber sensor. The Folin–Ciocalteu spectrophotometric assay was used to validate the results obtained with the sensor. The results obtained by using the voltammetric method were consistent with those obtained by using the spectrophotometric method, with no statistically significant differences between the results obtained at 95% confidence level. [ABSTRACT FROM AUTHOR]

Published
2020
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