Article
Chemistry, Analytical
Zulal Eryaman, Julide Hizal, Mesut Yilmazog, Ugur Daban, Hande Mert, Nergiz Kanmaz
Summary: In this study, the SNPAC method was developed using hypochlorous (ClO-) at pH 9.3 with Polyvinylpyrrolidone (PVP) as a stabilizer. The method achieved lower LOD and LOQ values by the reoxidation of silver atoms with ClO- ions in the presence of PVP. The modified method was applied to measure the total antioxidant capacity (TAC) of Boswellia Serrata, Aronia Melanocarpa tea, and juice with comparable results to CUPRAC and FRAP assays.
Article
Engineering, Chemical
Fouad Ali Abdullah Abdullah, Dani Dordevic, Eliska Kabourkova, Johana Zemancova, Simona Dordevic
Summary: This study compares the antioxidant capacities of meat products and their plant-based alternatives and finds that the plant-based alternatives have higher polyphenol content and antioxidant capacity compared to traditional meat products. In terms of sensory attributes, there are no significant differences between the two except for Frankfurter sausages.
Article
Food Science & Technology
Joanna Brzezinska-Rojek, Svitlana Sagatovych, Paulina Malinowska, Kamila Gadaj, Magdalena Prokopowicz, Malgorzata Grembecka
Summary: Due to their high bioactive substance content, beetroot and its preserves have the potential to be a valuable part of a balanced diet. However, research on the antioxidant capacity and nitrate content of beetroot-based dietary supplements (DSs) is limited worldwide. In this study, the total antioxidant capacity, total phenolic content, nitrites, and nitrates content were measured in fifty DSs and twenty beetroot samples using various methods. The results showed that fresh beetroot contains significantly higher levels of antioxidants, nitrites, and nitrates compared to most DSs. The safety of the products was also evaluated, and it was found that many DSs did not comply with labeling requirements. This highlights the need for stricter regulation of DSs, as their consumption could be potentially harmful.
Article
Horticulture
Ozlem Cakmakci, Suat Sensoy, Ali R. Alan
Summary: Edible parts of Alliums, such as A. vineale, are rich in bioactive compounds that promote human health. This study evaluated the bioactive constituents of A. vineale accessions collected from Turkey and found significant differences in their content levels. The findings provide an opportunity for selecting genetically superior accessions with high bioactive compound production for cultivation improvement.
SCIENTIA HORTICULTURAE
(2022)
Article
Chemistry, Applied
Rita Szekelyhidi, Erika Lakatos, Beatrix Sik, Agnes Nagy, Laura Varga, Zoltan Molnar, Viktoria Kapcsandi
Summary: The study aimed to create an herbal fermented alcoholic beverage with high antioxidant and polyphenol content, and increase the bioavailability of polyphenols and antioxidants through the dosage of herbs. The results showed that lemongrass and peppermint dosage significantly increased the antioxidant and polyphenol content.
Review
Engineering, Chemical
Izabela Sadowska-Bartosz, Grzegorz Bartosz
Summary: This review presents popular assays for total antioxidant capacity (TAC) in food products, their limitations, databases, clinical applications, and the impact of processing. It emphasizes the importance of sample preparation and digestion in the gastrointestinal tract on TAC. The validity of TAC assays is also discussed. TAC methods can be used for screening, discovering potential antioxidants, and monitoring changes during food processing, but should be followed and explained using more specific methods.
Article
Biochemistry & Molecular Biology
Aurita Butkeviciute, Vilma Petrikaite, Vidmante Jurgaityte, Mindaugas Liaudanskas, Valdimaras Janulis
Summary: The study evaluated the antioxidant, anti-inflammatory, and cytotoxic activities of apple extracts and individual triterpenes, showing that apple extracts have anti-inflammatory and antioxidant effects, as well as strong cytotoxic activity against tumor cell lines.
Article
Plant Sciences
Priyadarsini Sanghamitra, Saumya Ranjan Barik, Ramakrushna Bastia, Shakti Prakash Mohanty, Elssa Pandit, Abhisarika Behera, Jyotirmayee Mishra, Gaurav Kumar, Sharat Kumar Pradhan
Summary: Rice, as a staple food rich in antioxidant compounds, provides many health benefits. This study identified donor lines with multiple antioxidant properties and mapped significant marker-trait associations for antioxidant traits through association mapping, providing useful information for antioxidant improvement programs in rice.
Article
Biochemistry & Molecular Biology
Janez Mravljak, Lara Slavec, Martina Hrast, Matej Sova
Summary: Quinazolinones display diverse biological activities in medicinal chemistry. The study synthesized two series of 2-substituted quinazolin-4(3H)-ones and evaluated their antioxidant properties using three methods. The presence of hydroxyl groups or an ethylene linker enhanced antioxidant activity and led to metal-chelating properties in some derivatives.
Article
Chemistry, Physical
A. Csicsor, E. Tombacz, P. Kulcsar
Summary: An increasing proportion of the population in the Western world suffers from oxidative stress related diseases. In this study, the antioxidant potential of different humic substances (HSs) samples were evaluated and compared with well-known antioxidants. Various methods were used to assess the antioxidant potential of HSs, including determining total phenolic content, applying CUPRAC and QUENCHER-CUPRAC methods, and using electron spin resonance (ESR) for characterization. The results showed that HSs samples have antioxidant properties, and the antioxidant capacity is influenced by the extraction method and source.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Biochemistry & Molecular Biology
Min Woo Baek, Han Ryul Choi, Tifsehit Solomon, Cheon Soon Jeong, Ok-Hwan Lee, Shimeles Tilahun
Summary: The research findings demonstrate that preharvest MeJA treatment can significantly enhance the phytochemical composition and antioxidant activities of hydroponically grown pak choi. Hydroponically grown MeJA-treated pak choi shows higher levels of chlorophylls, total phenolics, GSLs, total flavonoids, and stronger antioxidant capacities compared to soil-grown counterparts.
Article
Food Science & Technology
Idriss Amit Aroufai, Merve Sabuncu, Dilek Dulger Altiner, Yasemin Sahan
Summary: The study showed that Arabica green coffee beans and roasted coffee beans have better bioaccessibility, while Robusta beans have higher total phenolic content and antioxidant capacity. Therefore, it is recommended to use these beans and their coffee silverskin in the development of functional foods and beverages.
JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION
(2022)
Article
Horticulture
Nicole Melanie Falla, Sonia Demasi, Matteo Caser, Valentina Scariot
Summary: Tea, a hot beverage made from dried leaves of the Camellia sinensis plant, is widely consumed globally and appreciated for its aroma, taste, and health benefits. This research evaluated the bioactive compounds and antioxidant activity of two green teas produced in Italy, showing that Italy has the potential to profitably cultivate Camellia sinensis.
Article
Biochemistry & Molecular Biology
Vesela Shopska, Rositsa Denkova-Kostova, Mina Dzhivoderova-Zarcheva, Desislava Teneva, Petko Denev, Georgi Kostov
Summary: The study examined the brewing characteristics, phenolic content, and antioxidant potential of different malt types used in craft breweries in Bulgaria. Statistical analysis revealed a relationship between malt color and phenolic compound content, as well as a link between the content of Maillard reaction products and malt biological activity. Malts with the highest degree of heat treatment exhibited the highest antioxidant activity due to the presence of Maillard reaction products with antioxidant capacity.
Article
Agronomy
Min Woo Baek, Han Ryul Choi, Lee Yun Jae, Ho-Min Kang, Ok-Hwan Lee, Cheon Soon Jeong, Shimeles Tilahun
Summary: The preharvest treatment of 0.25 mM methyl jasmonate (MeJA) and 0.5 mM salicylic acid (SA) had significant positive effects on the yield and quality parameters of 'Kumato' tomatoes, including increasing important secondary metabolites, amino acids, and antioxidant activities. MeJA treatment was found to be more effective than SA in improving the yield and nutritional quality of 'Kumato' tomatoes.
Article
Chemistry, Analytical
Selen Ayaz, Aysem Uzer, Yusuf Dilgin, Resat Apak
Summary: A novel amperometric method was developed for total antioxidant capacity determination using a copper-neocuproine complex modified electrode in a flow injection system. The electrode exhibited good electrocatalytic activity towards polyphenolic compounds and showed a wide linear range and low detection limit. The method was successfully applied to measure antioxidant capacity in herbal teas, providing results comparable to spectrophotometric methods but with improved precision and sensitivity.
Article
Spectroscopy
Furkan Burak Sen, Nilay Begic, Mustafa Bener, Resat Apak
Summary: In this study, a fluorescent polyethylenimine capped carbon quantum dots (PEI-C-dots) probe was synthesized and used to detect TNT residues. The synthesized PEI-C-dots exhibited high fluorescence quantum yield and low detection limit for TNT. The detection of TNT was not interfered by similar structured explosives, common soil ions, and camouflage agents.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Spectroscopy
Mustafa Bener, Furkan Burak Sen, Resat Apak
Summary: In this study, a gold nanocluster based turn on fluorescence sensor was developed for the determination of trace residues of 2,4,6-trinitrotoluene (TNT). The proposed sensor relies on the aggregation-induced emission enhancement mechanism, and showed good selectivity towards TNT with a large Stokes shift. It offers a simple, fast, and sensitive method for TNT determination.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Nanoscience & Nanotechnology
Selen Durmazel, Aysem Uzer, Resat Apak
Summary: In this paper, a simple and rapid nanosensing assay was developed using unlabeled gold nanoparticles (AuNPs) and the supramolecular association of NTO with melamine (MEL). The concentration of NTO could be determined by observing color change, even at a sub-femtomolar level. The analytical results showed a linear relationship between the logarithm of NTO concentration and the absorption ratio. The synthesized AuNPs were characterized using various methods, and potential interferences were examined. NTO recovery was also achieved successfully.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Omer Kaan Koc, Aysem Uzer, Resat Apak
Summary: A nitrogen-doped carbon quantum dot-based fluorometric probe was developed for the selective determination of TNT, which showed high quantum yield and excellent quenching effect. The study also demonstrated the potential use of N-CQDs in environmental sensor applications and developed two support materials for on-site detection.
ACS APPLIED NANO MATERIALS
(2022)
Editorial Material
Chemistry, Analytical
Mustafa Soylak, Resat Apak
Summary: This special issue of Analytical Letters features selected articles from the Third International Congress of Environmental Chemistry (EnviroChem 2021), in which the authors have expanded upon their conference papers and included their latest experimental results. EnviroChem 2021 aimed to promote and disseminate knowledge on various topics and technologies related to Environmental Chemistry. All articles have undergone the standard review process.
ANALYTICAL LETTERS
(2023)
Review
Chemistry, Analytical
Resat Apak, Aysem Uzer, Sener Saglam, Aysu Arman
Summary: Explosive detection technologies play a critical role in national security, and there is a demand for improved sensitivity and selectivity in current detection techniques. Electrochemical devices combined with nanomaterials offer a simpler, cheaper, and faster way to obtain targeted analytical information. This review focuses on providing information related to MIPs and nanomaterial-based electrochemical sensors.
Article
Spectroscopy
Herbert Cirrus Kaboggoza, Burcu Bekdeser, Resat Apak
Summary: A fluorescent gold nanocluster was used to determine the peroxyl radical scavenging activity of antioxidants. The addition of glutathione enhanced the fluorescence intensity of the gold nanoclusters, while antioxidants reduced the decline in fluorescence intensity caused by peroxyl radical attack. This method provides a simple and selective estimation of peroxyl radical scavenging activity in complex matrices.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Ayse Nur Onem, Kevser Sozgen Baskan, Resat Apak
Summary: In this study, a gold nanoparticle (AuNP)-decorated and multiwalled carbon nanotube (MWCNT)-Nafion-modified glassy carbon electrode (GCE/AuNP/MWCNT-Nafion) was developed to assess the preventive effect of antioxidants on oxidative DNA damage. The electrochemical method relied on two phenomena: (i) reactive species (RS) produced by dissolved oxygen in the presence of copper(II) partially damaged the DNA immobilized on the electrode surface, and (ii) antioxidant compounds prevented this damage by scavenging the formed RS. The DNA protective ability of various antioxidant compounds was evaluated, with quercetin showing the highest antioxidant effect.
Article
Engineering, Environmental
Mehmet Kilincer, Hasan Saygin, Mustafa Ozyurek, Asli Baysal
Summary: As a carrier of various inorganics and organics, micro(nano)plastics have significant impacts on the environment and human health. Although the sorption of antibiotics onto micro(nano)plastics has been studied, the sorption of vitamins, particularly vitamin B1, remains uninvestigated. This study aimed to examine the sorption of vitamin B1 onto different micro(nano)plastics from food packaging under various pH conditions. The results showed that polypropylene and polyethylene micro(nano)plastics exhibited higher sorption capacities for vitamin B1, with similar kinetics observed at different pH levels. However, the sorption responses of polyethylene terephthalate and polystyrene varied. The study also found that the sorption kinetics between vitamin B1 and micro(nano)plastics could be better described by the pseudo-first-order model for polyethylene terephthalate and polystyrene, while it changed for polypropylene and polyethylene. Moreover, the sorption of vitamin B1 onto micro(nano)plastics was found to involve both chemical and physical sorption processes under different pH and polymer types.
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Omer Kaan Koc, Aysem Uzer, Resat Apak
Summary: Oxygen- and nitrogen-heteroatom-doped carbon dots were prepared for the selective and sensitive determination of picric acid. The fluorescence of the carbon dots was selectively quenched by picric acid through ground-state interaction. The detection limits for picric acid were 12.5 pM (by emission measurement) and 0.9 nM (by absorption measurement). Smartphone-assisted fluorometric detection of picric acid was also achieved by incorporating the carbon dots into a polymer composite film.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Pervin Isik Bilgili, Saliha Esin Celik, Resat Apak
Summary: A colorimetric method based on CD-AgNP (cyclodextrin-stabilized silver nanoparticles) was developed for the determination of metformin in drug preparations. The method showed high sensitivity and selectivity, and was capable of accurately measuring the MET content in different drug samples. Compared to other nanoparticle-based colorimetric methods, this method exhibited higher or comparable sensitivity.
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
(2023)
Article
Chemistry, Analytical
Aysu Arman, Sener Saglam, Aysem Uzer, Resat Apak
Summary: This work presents a novel sensor electrode for electrocatalytic reduction of nitro-aromatic explosives (NAEs) by combining electrochemically reduced graphene nanosheets (GNSs) with a poly-caffeic acid (pCAF) film-modified glassy carbon electrode (GCE). The sensor showed high performance for TNT detection and could accurately determine various NAEs. The optimized electrode demonstrated resistance to interference effects and satisfactory results in real samples.
Article
Nanoscience & Nanotechnology
Omer Kaan Koc, Aysem Uzer, Resat Apak
Summary: Oxygen- and nitrogen-heteroatom-doped carbon dots were prepared for the selective and sensitive determination of picric acid, and their fluorescence properties were characterized. The results showed that these carbon dots can selectively detect picric acid in the presence of other explosives.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Aesha Fsh Abdassalam, Nahide Gulsah Deniz, Cigdem Sayil, Mustafa Ozyurek, Emin Ahmet Yesil, Huseyin Salihoglu
Summary: In this study, a series of new nitronaphthoquinone regioisomers with different functional groups were synthesized and their enzyme inhibition activity on catalase as well as antioxidant capacity were evaluated.
ACTA CHIMICA SLOVENICA
(2022)
