Detection of 8-Hydroxy-2'-Deoxyguanosine Biomarker with a Screen-Printed Electrode Modified with Graphene.

In this work we present the preparation of graphene material by exfoliation of graphite rods via pulses of current in electrolyte, containing a mixture of boric acid (0.05 M) and sodium chloride (0.05 M). The material was morphologically and structurally characterized by SEM/TEM/HR-TEM, XRD and FTIR techniques. TEM investigation of graphene flakes deposited onto carbon-coated grids allowed the visualization of thin and transparent regions, attributed to few-layer graphene (FLG), as well as thick and dark regions attributed to multi-layer graphene (MLG). The mixed composition of the material was additionally confirmed by XRD, which further indicated that the amount of FLG within the sample was around 83%, while MLG was around 17%. The performance of a screen-printed electrode (SPE) modified with graphene (SPE-Gr) was tested for 8-hydroxy-2'-deoxyguanosine detection. The graphene-modified electrode had a higher sensitivity in comparison with that of SPE, both in standard laboratory solutions (phosphate buffered saline-PBS) and in human saliva.

Electrochemical Sensing Device for Carboplatin Monitoring in Proof-of-Concept Drug Delivery Nanosystems.

(1) Background: Carboplatin (CBP) is a chemotherapeutic drug widely used in the treatment of a variety of cancers. Despite its efficiency, CBP is associated with side effects that greatly limit its clinical use. To mitigate these effects, CBP can be encapsulated in targeted delivery systems, such as liposomes. Ensuring the adequate loading and release of CBP from these carriers requires strict control in pharmaceutical formulation development, demanding modern, rapid, and robust analytical methods. The aim of this study was the development of a sensor for the fast and accurate quantification of CBP and its application on proof-of-concept CBP-loaded nanosomes. (2) Methods: Screen-printed electrodes were obtained in-lab and the electrochemical behavior of CBP was tested on the obtained electrodes. (3) Results: The in-lab screen-printed electrodes demonstrated superior properties compared to commercial ones. The novel sensors demonstrated accurate detection of CBP on a dynamic range from 5 to 500 µg/mL (13.5-1350 µM). The method was successfully applied on CBP loaded and released from nanosomes, with strong correlations with a spectrophotometric method used as control. (4) Conclusions: This study demonstrates the viability of electrochemical techniques as alternative options during the initial phases of pharmaceutical formulation development.

Recent Advances in the Development of Drug Delivery Applications of Magnetic Nanomaterials.

With the predicted rise in the incidence of cancer, there is an ever-growing need for new cancer treatment strategies. Recently, magnetic nanoparticles have stood out as promising nanostructures for imaging and drug delivery systems as they possess unique properties. Moreover, magnetic nanomaterials functionalized with other compounds can lead to multicomponent nanoparticles with innovative structures and synergetic performance. The incorporation of chemotherapeutic drugs or RNA in magnetic drug delivery systems represents a promising alternative that can increase efficiency and reduce the side effects of anticancer therapy. This review presents a critical overview of the recent literature concerning the advancements in the field of magnetic nanoparticles used in drug delivery, with a focus on their classification, characteristics, synthesis and functionalization methods, limitations, and examples of magnetic drug delivery systems incorporating chemotherapeutics or RNA.

Antimicrobial Meshes for Hernia Repair: Current Progress and Perspectives.

Recent advances in the development of biomaterials have given rise to new options for surgery. New-generation medical devices can control chemical breakdown and resorption, prevent post-operative adhesion, and stimulate tissue regeneration. For the fabrication of medical devices, numerous biomaterials can be employed, including non-degradable biomaterials (silicone, polypropylene, expanded polytetrafluoroethylene) or biodegradable polymers, including implants and three-dimensional scaffolds for tissue engineering, which require particular physicochemical and biological properties. Based on the combination of new generation technologies and cell-based therapies, the biocompatible and bioactive properties of some of these medical products can lead to progress in the repair of injured or harmed tissue and in tissue regeneration. An important aspect in the use of these prosthetic devices is the associated infection risk, due to the medical complications and socio-economic impact. This paper provides the latest achievements in the field of antimicrobial surgical meshes for hernia repair and discusses the perspectives in the development of these innovative biomaterials.

The Impact of the COVID-19 Pandemic on Research and Volunteering Activities among Medical Students: A Cross-Sectional Study among Romanian and International Students from One Medical Faculty from Romania.

INTRODUCTION: This study focuses on the influence of the COVID-19 pandemic on medical students in their last year of study at the Faculty of Medicine of the University of Medicine and Pharmacy in Cluj-Napoca, Romania. It analyzes the impact of social distance limits on the conduct of research activities required for the development of the graduation thesis, as well as assesses sixth-year students' attitudes and behaviors toward volunteer activities during the COVID-19 pandemic. METHODS: A cross-sectional survey was conducted in June-July 2021 among sixth-year students. It used an anonymous online questionnaire and was sent to all students from the Faculty of Medicine studying in the Romanian, English, or French sections (n = 606). The response rate was 38.28%, resulting in a final sample of 232 students from both Romanian and international sections. RESULTS: The findings demonstrate that two-thirds of the students in the survey agreed that the COVID-19 pandemic had a substantial impact on their research. Some of the students had to choose another subject for their graduation thesis, while about a quarter of the students gave up collecting personal data, 25% of respondents stated that it was difficult to contact research participants, one-third of them linked the difficulty of doing activities at the hospital to the present outbreak, and almost 30% of the students had difficulty communicating with the coordinator. The disturbance of the research activity seems to be higher among international students in comparison with the Romanian students, while there are limited gender differences. One out of five medical students has been involved in volunteer activities during the pandemic. Most have opted to volunteer at hospitals (especially international students) and contribute to health education activities (especially women). CONCLUSIONS: This is the first study from Romania and one of the few from Europe that presents data regarding the influence of the COVID-19 pandemic on research and volunteering activities among medical students.

Wearable Sensors for the Detection of Biomarkers for Wound Infection.

Infection represents a major complication that can affect wound healing in any type of wound, especially in chronic ones. There are currently certain limitations to the methods that are used for establishing a clinical diagnosis of wound infection. Thus, new, rapid and easy-to-use strategies for wound infection diagnosis need to be developed. To this aim, wearable sensors for infection diagnosis have been recently developed. These sensors are incorporated into the wound dressings that are used to treat and protect the wound, and are able to detect certain biomarkers that can be correlated with the presence of wound infection. Among these biomarkers, the most commonly used ones are pH and uric acid, but a plethora of others (lactic acid, oxygenation, inflammatory mediators, bacteria metabolites or bacteria) have also been detected using wearable sensors. In this work, an overview of the main types of wearable sensors for wound infection detection will be provided. These sensors will be divided into electrochemical, colorimetric and fluorimetric sensors and the examples will be presented and discussed comparatively.

Antitussive, Antioxidant, and Anti-Inflammatory Effects of a Walnut (Juglans regia L.) Septum Extract Rich in Bioactive Compounds.

The antitussive, antioxidant, and anti-inflammatory effects of a walnut (Juglans regia L.) septum extract (WSE), rich in bioactive compounds were investigated using the citric acid aerosol-induced cough experimental model in rodents. Wistar male rats were treated orally for three days with distilled water (control), codeine (reference), and WSE in graded doses. On the third day, all rats were exposed to citric acid aerosols, the number of coughs being recorded. Each animal was sacrificed after exposure, and blood and lung tissue samples were collected for histopathological analysis and the assessment of oxidative stress and inflammatory biomarkers. The results of the experiment showed a significant antitussive effect of WSE, superior to codeine. This activity could be due to cellular protective effect and anti-inflammatory effect via the stimulation of the antioxidant enzyme system and the decrease of IL-6 and CXC-R1 concentration in the lung tissue of WSE-treated animals. The antioxidant and anti-inflammatory effects of WSE were confirmed by biochemical assays and histopathological analysis. This is the first scientific study reporting the antitussive effect of walnut septum, a new potential source of non-opioid antitussive drug candidates, and a valuable bioactive by-product that could be used in the treatment of respiratory diseases.

First description of plasmid-mediated quinolone resistance determinants and ß-lactamase encoding genes in non-typhoidal Salmonella isolated from humans, one companion animal and food in Romania.

BACKGROUND: Gastroenteritis attributable to Salmonella enterica and the continuous increase in antimicrobial resistance of this gut pathogen, which compromises the use of previously effective treatments, is of great concern for public health. This study was conducted in order to investigate the presence of plasmid-mediated quinolone resistance (PMQR) determinants and ß-lactamase-encoding genes, in S. enterica, isolated from humans, one companion animal and food. Moreover, the study aimed to identify potential vehicles of transmission of resistant strains to humans, with focus on food products (meat). METHODS: A total of 20 S. enterica isolates recovered from food (chicken and pork meat), one companion animal and humans (stool samples), were examined for their serotype, antimicrobial susceptibility and the presence of PMQR and ß-lactamase-encoding genes. Moreover, the genetic relatedness of nine Salmonella Infantis and ten Salmonella Enteritidis isolates was analyzed by pulsed-field gel electrophoresis (PFGE). RESULTS: Among all isolates, 15 (75%) were multidrug-resistant (MDR) and the majority of them proved to be resistant to nalidixic acid and fluoroquinolones (FQs) (ciprofloxacin and levofloxacin). Twelve isolates (60%) harboured at least one PMQR gene [qnrA, qnrB, qnrS, aac (6')-Ib-cr or qepA] while seven isolates (35%) carried at least one ß-lactamase-encoding gene (bla TEM, bla PSE-1, bla SHV or bla CTX-M). Moreover, two or more PMQR or ß-lactamase-encoding genes co-existed in a single S. enterica isolate. A number of nine Salmonella Infantis, as well as the majority of Salmonella Enteritidis isolates analyzed by PFGE proved to be closely related. CONCLUSIONS: The study demonstrated the co-existence of PMQR and ß-lactamase-encoding genes among the Salmonella isolates recovered and confirmed that multiple mechanisms might be involved in the acquisition and spread of resistance determinants. The close genetic relatedness between the clinical and foodborne S. enterica isolates, suggested that chicken meat might be a possible cause of human salmonellosis in our country, during the study period. Results of this study might improve understanding of the antimicrobial resistance mechanisms and transmission dynamics of Salmonella spp. Here, we report for the first time the presence of PMQR and ß-lactamase-encoding genes in S. enterica isolates, recovered from humans, one companion animal and food, in Romania.

The study of some polyphenolic compounds from Melissa officinalis L. (Lamiaceae).

UNLABELLED: We proposed the analyses of polyphenolic coumpounds from the Melissa officinalis L. (Lamiaceae) leaves obtained from Medicinal Plant Collection of USAMV Cluj-Napoca. MATERIAL AND METHOD: The study was performed by using spectrophotometric (I) and HPLC methods (II). RESULTS: The vegetal product contains 0.64% flavonoids expressed in rutoside and 8,962% phenyl-propane derivatives expressed in caffeic acid (I). HPLC analyses (II) were made after extraction of studied compounds from leaves with ethyl-ether, ethyl acetate and 1-buthanol. These extracts were analyzed before and after the hydrolysis of compounds. There were identified 6 polyphenolic compounds: caftaric acid, caffeic acid, p-cumaric acid, ferulic acid, luteolin and apigenin. CONCLUSION: The extracted amount of these compounds in chosen solvents depending of their polarity.