Unidentified Substance Research Articles

Machine learning-based q-RASAR predictions of the bioconcentration factor of organic molecules estimated following the organisation for economic co-operation and development guideline 305

In this study, we utilized an innovative quantitative read-across (RA) structure-activity relationship (q-RASAR) approach to predict the bioconcentration factor (BCF) values of a diverse range of organic compounds, based on a dataset of 575 compounds tested using Organisation for Economic Co-operation and Development Test Guideline 305 for bioaccumulation in fish. Initially, we constructed the q-RASAR model using the partial least squares regression method, yielding promising statistical results for the training set (R2 =0.71, Q2LOO=0.68, mean absolute error [MAE]training=0.54). The model was further validated using the test set (Q2F1=0.77, Q2F2=0.75, MAEtest=0.51). Subsequently, we explored the q-RASAR method using other regression-based supervised machine-learning algorithms, demonstrating favourable results for the training and test sets. All models exhibited R2 and Q2F1 values exceeding 0.7, Q2LOO values greater than 0.6, and low MAE values, indicating high model quality and predictive capability for new, unidentified chemical substances. These findings represent the significance of the RASAR method in enhancing predictivity for new unknown chemicals due to the incorporation of similarity functions in the RASAR descriptors, independent of a specific algorithm.

Gravimetric, morphological, and chemical characterization of fine and ultrafine particulate matter inside fire stations

Poor air quality inside buildings has direct implications for human health. The activity of firefighters causes cancer and promotes the development/aggravation of cardio-respiratory diseases. The indoor air quality inside fire stations remains poorly characterized. This work assesses firefighters’ daily exposure to fine (PM2.5, PM156nm) and ultrafine (PM50.4nm, PM30.8nm) particulate matter (PM) inside three microenvironments of fire stations, and, for the first time, characterizes the morphology and elemental content of collected PM. Fine PM fractions were predominant in all microenvironments. Fine and ultrafine PM concentrations were increased in the personal protective equipment (PPE) storage room than in the common area and garage [11.84–103.5 μg/m3versus 18.67–51.89 μg/m3 and 22.57–70.69 μg/m3; p > 0.05 and 4.78–46.02 μg/m3versus 3.03–40.99 μg/m3 and 5.55–23.30 μg/m3; p > 0.05]; values were below the guideline proposed for occupational exposure to respirable dust (5.0 mg/m3). The morphological analysis revealed the presence of organic matter, microorganisms, crystals, minerals, metals, and other unidentified substances in fine/ultrafine PM. Exposure to total PM-bound metals was increased in the garage comparatively to the common area and the PPE storage room (2765.0–46586.0 pg/m3versus 2414.2–4568.6 pg/m3; p > 0.5). Cu, Zn, and Cr were the predominant PM-bound metals while Sb, Cd, and Tl were the less abundant. Exposure to PM-bound possible/probable carcinogenic metals (Ni, Cd, Sb, and Pb) accounted for 7.81–10.72% and 0.342–13.07% of fine and ultrafine PM, respectively. The data generated can support regulatory agencies in proposing air quality guidelines that promote occupational safety and health.

Transcriptomic profiling and the first spatial expression analysis of candidate genes in the salivary gland of the East Asian medicinal leech, Hirudo nipponia

Hirudo nipponia, a blood-sucking leech native to East Asia, possesses a rich repertoire of active ingredients in its saliva, showcasing significant medical potential due to its anticoagulant, anti-inflammatory, and antibacterial effects against human diseases. Despite previous studies on the transcriptomic and proteomic characteristics of leech saliva, which have identified medicinal compounds, our knowledge of tissue-specific transcriptomes and their spatial expression patterns remains incomplete. In this study, we conducted an extensive transcriptomic profiling of the salivary gland tissue in H. nipponia based on de novo assemblies of tissue-specific transcriptomes from the salivary gland, teeth, and general head region. Through gene ontology (GO) analysis and hierarchical clustering, we discovered a novel set of anti-coagulant factors—i.e., Hni-Antistasin, Hni-Ghilanten, Hni-Bdellin, Hni-Hirudin—as well as a previously unrecognized immune-related gene, Hni-GLIPR1 and uncharacterized salivary gland specific transcripts. By employing in situ hybridization, we provided the first visualization of gene expression sites within the salivary gland of H. nipponia. Our findings expand on our understanding of transcripts specifically expressed in the salivary gland of blood-sucking leeches, offering valuable resources for the exploration of previously unidentified substances with medicinal applications.

Acute chemical pulmonary edema with inhaled nitrogen dioxide intoxication

Nitrogen dioxide is released by the interaction of some metals with nitric acid. Inhalation intoxication with nitrogen dioxide leads to chemical pulmonary edema. This study presents the case of a patient who had acute inhalation exposure to an unidentified brown gaseous substance (presumably nitrogen dioxide) when he etched a metal product with nitric acid. Twenty-four hours after contact with the gas, he manifested signs of intoxication, such as chest pain, tachypnea, and decreased saturation. Laboratory tests revealed hemoconcentration, hyperfermentemia, and arterial hypoxemia. The X-ray image of the entire lung surface revealed a sharp increase and deformation of the pulmonary pattern due to the vascular component. The diagnosis was T65, i.e., toxic effect of other and unspecified substances. With treatment, the patients condition improved. On day 4 after therapeutic exposure, with decreased oxygen fraction in the inhaled gas mixture to 0.3, the saturation increased to 98%, and tachypnea disappeared. On day 6, with ongoing treatment (oxygen therapy, use of antioxidants, antihypoxants, anti-inflammatory, and antibacterial drugs), the inflammatory reaction stopped, the rheological properties of the blood improved, and the gas composition of arterial blood normalized, i.e., the oxygenation index was 436, which indicated the disappearance of arterial blood oxygenation disorders. During the radiological examination, the normal radiological picture of the lungs was determined. Thus, on day 6 after the start of therapy, signs of intoxication were completely stopped. Specific changes in the lungs during radiation research techniques, hemoconcentration, inflammation, and hypoxemia during laboratory blood tests should be considered prognostic signs of chemical pulmonary edema. As a pathogenetic therapy, treatment must be supplemented with drugs that stop the cascade of free radical oxidation reactions (acetylcysteine and sodium thiosulfate). Individuals exposed to nitrogen dioxide should be considered a high-risk group for lung damage and hospitalized for dynamic observation for at least 2 days. Taking into account the genotoxic effects of nitrogen dioxide, affected patients should be classified as at risk of developing neoplasms and undergo further dynamic monitoring.

Poisoning with cardiological drugs in patients hospitalized in the toxicological and cardiological department from 04/2013 to 12/2021

Introduction and purpose: Cardiological drugs are widely used in the management of various cardiovascular diseases, such as hypertension, angina, heart failure, and arrhythmias. However, when these drugs are taken in excessive amounts or are not used as prescribed, they can become toxic and cause significant harm to the heart and other organs. Our study aims to illustrate the most frequent causes of poisoning with cardiological drugs in patients hospitalized in the toxicological and cardiological department from April 2013 to December 2021. Brief description of the state of knowledge: Poisoning with cardiological drugs is a growing concern for healthcare professionals. In 2019, cardiovascular toxins were one of the top 10 categories of poisons evaluated by medical toxicologists. Data collected from the analyzed toxicology and cardiology department include a group of 387 hospitalized patients. The largest proportion were cases intoxicated by beta-adrenoreceptor antagonists. The second most common group was poisonings by angiotensin-converting-enzyme inhibitors. A slightly lower proportion implicated poisonings caused by other, unidentified substances affecting the cardiovascular system - calcium channel blockers and other antihypertensive drugs. Conclusions: All of the data demonstrated in our study shows the importance of understanding the pharmacology, pathophysiology, and treatment strategies of poisonings caused by cardiological drugs which are one the most widely used medications worldwide.

Investigation of Adverse Reactions in Tattooed Skin through Histological and Chemical Analysis

Background: Just as the number of tattooed people has increased in recent years, so has the number of adverse reactions in tattooed skin. Tattoo colourants contain numerous, partly unidentified substances, which have the potential to provoke adverse skin reactions like allergies or granulomatous reactions. Identification of the triggering substances is often difficult or even impossible. Methods: Ten patients with typical adverse reactions in tattooed skin were enrolled in the study. Skin punch biopsies were taken and the paraffin-embedded specimens were analysed by standard haematoxylin and eosin and anti-CD3 stainings. Tattoo colourants provided by patients and punch biopsies of patients were analysed with different chromatography and mass spectrometry methods and X-ray fluorescence. Blood samples of 2 patients were screened for angiotensin-converting enzyme (ACE) and soluble interleukin-2 receptor (sIL-2R). Results: Histology showed variable skin reactions such as eosinophilic infiltrate, granulomatous reactions, or pseudolymphoma. CD3+ T lymphocytes dominated the dermal cellular infiltrate. Most patients had adverse skin reactions in red tattoos (n = 7), followed by white tattoos (n = 2). The red tattooed skin areas predominantly contained Pigment Red (P.R.) 170, but also P.R. 266, Pigment Orange (P.O.) 13, P.O. 16, and Pigment Blue (P.B.) 15. The white colourant of 1 patient contained rutile titanium dioxide but also other metals like nickel and chromium and methyl dehydroabietate – known as the main ingredient of colophonium. None of the 2 patients showed increased levels of ACE and sIL-2R related to sarcoidosis. Seven of the study participants showed partial or complete remission after treatment with topical steroids, intralesional steroids, or topical tacrolimus. Conclusions: The combination of the methods presented might be a rational approach to identify the substances that trigger adverse reactions in tattoos. Such an approach might help make tattoo colourants safer in the future if such trigger substances could be omitted.

Intravenous administration of apeling-13 induces a depressor response by releasing an unidentified substance

Apelin and APJ receptor play an important role in the regulating cardiovascular function; however, conflicting results have been reported regarding the effect of apelin on cardiovascular regulation. In this study, blood pressure and heart rate were measured by femoral arterial catheterization; and cardiac contractility was recorded by left ventricular catheterization through the right carotid artery in rats before and after intravenous administration of [pyr1]-apelin-13. The results show that intravenous administration of apelin-13 caused a dramatic reduction in BP but did not significantly alter heart rate and contractility. To study the mechanism of the apelin-induced depressor response, isometric tension was measured in isolated mesenteric arteries using a myograph approach. Surprisingly, treatment of the arteries with [pyr1]-apelin-13 did not cause relaxation of mesenteric arteries preconstricted with norepinephrine; however, treatment with plasma collected from rats that received intravenous administration of [pyr1]-apelin-13 caused pronounced relaxation of isolated arteries. Incubation with the guanylyl cyclase inhibitor, ODQ, blocked NO-induced relaxation, but did not significantly alter the relaxation response to the plasma from apelin-treated rats. Taken together, these findings demonstrate that intravenous injection of apelin causes a significant depressor response that is mediated by a NO-independent mechanism involving an unidentified substance released into the bloodstream leading to vasodilation.

Forensic seized drug analysis: Current challenges and emerging analytical solutions

AbstractOver the past decade, new challenges in seized drug analysis have pushed the limits of existing instrumentation and workflows. These challenges include increasing caseloads, complex samples containing previously unidentified substances, and evolving legal requirements. Traditional approaches to seized drug analysis—such as gas chromatography mass spectrometry, color tests, and Fourier transform infrared spectroscopy—can be insufficient for current challenges, motivating the community to explore new instrumentation or data analysis solutions. However, the road to validation, implementation, and adoption of new technologies and solutions can be arduous. In this overview, we discuss the major challenges facing the seized drug community that can be addressed by advances in analytical approaches and highlight some emerging techniques that have been or could be adopted by laboratories in the near‐term. We also discuss specific hurdles limiting the implementation and adoption of new techniques, and approaches to lower these barriers.This article is categorized under: Forensic Chemistry and Trace Evidence > Controlled and Emerging Drug Compounds Forensic Chemistry and Trace Evidence > Emerging Technologies and Methods Forensic Chemistry and Trace Evidence > Presentation and Evaluation of Forensic Science Output

Profile of Childhood Poisoning and Its Outcomes in the United States: A One-Year Nationwide Study of Emergency and Inpatient Admissions.

Childhood poisoning is a prevalent and significant public health issue, with a higher incidence among children under the age of five due to their natural inquisitiveness and impulsive behavior. In order to gain a better understanding of the burden and outcomes of acute poisoning in children, this study utilized data from two comprehensive databases: the 2018 Nationwide Emergency Department Sample and the National (Nationwide) Inpatient Sample. A total of 257,312 hospital visits were analyzed, with 85.5% being emergency department visits and 14.5% being inpatient admissions. Drug overdose emerged as the most commonly known cause of poisoning in both emergency and inpatient settings. While alcohol poisoning was the predominantly known cause of non-pharmaceutical poisoning in the inpatient setting, household soaps and detergents were more common in the emergency setting. Among the identified pharmaceutical agents, non-opioid analgesics and antibiotics were the most frequently implicated. However, a significant proportion of the poisoning cases were caused by unidentified substances (26.8% in the pharmaceutical group and 72.2% in the non-pharmaceutical group). There were 211 deaths in total and further analysis revealed that patients with higher Charlson indices and hospital stays exceeding seven days were associated with increased likelihood of mortality. Additionally, admission to teaching hospitals or hospitals located in the western region of the country was linked to an increased likelihood of an extended hospital stay.

Present in the Aquatic Environment, Unclear Evidence in Top Predators-The Unknown Effects of Anti-Seizure Medication on Eurasian Otters (Lutra lutra) from Northern Germany.

Emerging contaminants are produced globally at high rates and often ultimately find their way into the aquatic environment. These include substances contained in anti-seizure medication (ASM), which are currently appearing in surface waters at increasing concentrations in Germany. Unintentional and sublethal, chronic exposure to pharmaceuticals such as ASMs has unknown consequences for aquatic wildlife. Adverse effects of ASMs on the brain development are documented in mammals. Top predators such as Eurasian otters (Lutra lutra) are susceptible to the bioaccumulation of environmental pollutants. Still little is known about the health status of the otter population in Germany, while the detection of various pollutants in otter tissue samples has highlighted their role as an indicator species. To investigate potential contamination with pharmaceuticals, Eurasian otter brain samples were screened for selected ASMs via high-performance liquid chromatography and mass spectrometry. Via histology, brain sections were analyzed for the presence of potential associated neuropathological changes. In addition to 20 wild otters that were found dead, a control group of 5 deceased otters in human care was studied. Even though none of the targeted ASMs were detected in the otters, unidentified substances in many otter brains were measured. No obvious pathology was observed histologically, although the sample quality limited the investigations.

Specialist medical toxicologist consultations provided by the New Zealand National Poisons Centre, 2018-2020.

The National Poisons Centre (NPC) provides 24/7 specialist medical toxicologist consultations to healthcare professionals regarding the clinical management of poisoning cases. The use of toxicologist services was investigated to characterise the extent and content of consults to inform further development of this service. A retrospective analysis of 2018-2020 medical toxicologist consultations summarised contact numbers, professional backgrounds and district health boards (DHBs) of the people contacting the NPC, and the patient(s) and substance(s) involved. There were 3,451 medical toxicologist consultations with 2,400 (67%) provided directly to healthcare professionals. Crude rates of consults increased across all DHBs. Of all 2,603 therapeutic substances that were consulted about during the study period, 1,492 (57.3%) were drugs affecting the nervous system, and paracetamol was the most common individual drug (528; 20.3%). Of all 1,185 non-therapeutic substance exposures that were advised on, 66 (5.6%) were unidentified mushrooms, 51 (4.3%) unidentified substances, and 47 (4.0%) lead exposures. There was increasing utilisation of the NPC service by healthcare professionals from all 24 areas of the country, covering a wide range of substance exposures and scenarios. The growing utilisation suggests healthcare professionals derive value from this consultation service for the care of their patients.

GC-MS Analysis of Volatiles Present in Pappea Capensis Extracts

The use of medicinal plants played a crucial role in human survival for many years. Papea capensis is used mostly in the Northern part of South Africa and neighboring countries. The woody part of the tree was collected, shade dried, and powdered. The extraction experiments (ethanolic extract, methanol extract, and water extract) were done at Synexa Life Sciences. For the purpose of identifying the biochemical elements present in the wood portion of Pappea capensis, the extracts were concentrated and analyzed using Gas Chromatography-Mass Spectroscopy at Central Analytical Facilities (CAF), University of Stellenbosch, South Africa. GC-MS identified 41 compounds which included 4-ethylbenzaldehyde, 2, 4-diter- butyl phenol, acetic acid, and butanoic acid, have a role in antioxidant, antimicrobial, antitumor, and antifungal effects. Regardless of their quantities, seven (7) unidentified phytochemical substances were discovered; their existence may have a favourable effect on therapeutic agents and be a source of the biological activities ascribed to them by conventional healers. Furthermore, it is a holistic plant for use in traditional medicine and aesthetic value among the indigenous communities in Limpopo due to the several varied chemical components that have been found. The three extracts must be fractionated according to bioassay-guidance to identify the pure components and establish which ones are physiologically active. The medicinal plants, being the only sources that traditional healers rely on for the treatment of their patients, have received tremendous attention in drug therapy, discovery, and development. These studies have demonstrated that Pappea capensis is a plant with potential for use in phytopharmaceuticals.

WORLD EXPERIENCE IN THE USE OF PORTABLE ANALYTICAL EQUIPMENT AT THE CRIME SCENE

The current state of development of the production of portable analytical equipment, which is used in the prevention, detection and investigation of crimes carried out outside the laboratory to provide emergency assistance in criminal investigations or for judicial intelligence. It is emphasized that investigations conducted directly at the crime scene are extremely important for the acceleration and efficiency of the pre-trial investigation, prevent delays in sending materials to forensic laboratories, and allow finding the perpetrator until he has destroyed the evidence or not. left the crime scene. An overview of the world’s existing analytical platforms (sensors) is provided, on the basis of which portable equipment is created for convenient, fast, accurate detection of relevant substances during operational (search) actions, prevention and detection of crimes. The experience of using portable analytical equipment by forensic services of foreign countries is analyzed and noted; There is currently a need for analytical techniques that have sufficiently reliable data and conclusions that serve as evidence in court and could be used to work at the crime scene in real-time. The latest technological developments create new opportunities for research outside the laboratory. The benefits of forensic real-time forensic investigations are numerous, and such technologies significantly increase the speed of investigations and the efficiency of the criminal justice system. The issue of covering the peculiarities of technical and forensic support for the investigation of crimes has not yet been properly reflected in the domestic scientific literature. Specific examples of portable systems for on-site analysis were presented, which had high sensitivity and specificity in conducting qualitative and quantitative analysis in the field of public safety, environmental protection and monitoring of production processes. The most common are ion mobility spectrometry, mass spectrometry, and gas chromatography, followed by determination using a sensitive detector. Such portable devices/systems are well established for forensic research on drugs, explosives, unidentified substances, paints, polymers, toners, pen pastes, fibres, beverages, blood tests, gems and minerals, successfully used for DNA identification, blood tests to detect group and rhesus factor. Key words: portable equipment, crime scene, mass spectrometry, spectros- copy, paper sensors, electrochemical sensors.

Histamine elimination by a coupling reaction of fungal amine oxidase and bacterial aldehyde oxidase†.

Histamine (HIST) and other biogenic amines found in fish and fishery products accumulated by the action of bacterial amino acid decarboxylase cannot be decomposed and eliminated by heating or other chemical methods. A simple method for HIST elimination is proposed by a coupling reaction of the fungal amine oxidase (FAO) and bacterial aldehyde oxidase (ALOX) of acetic acid bacteria. As a model reaction, FAO oxidized benzylamine to benzaldehyde, which in turn was oxidized spontaneously to benzoic acid with ALOX. Likely, in HIST elimination, FAO coupled well with ALOX to produce imidazole 4-acetic acid from HIST with an apparent yield of 100%. Imidazole 4-acetaldehyde was not detected in the reaction mixture. In the absence of ALOX, the coupling reaction was incomplete given a number of unidentified substances in the reaction mixture. The proposed coupling enzymatic method may be highly effective to eliminate toxic amines from fish and fishery products.

The Scale of Intoxications with New Psychoactive Substances over the Period 2014-2020-Characteristics of the Trends and Impacts of the COVID-19 Pandemic on the Example of Łódź Province, Poland.

Legal highs are new psychoactive substances (NPSs) which pose a high risk for human health, and the spread of the SARS-CoV-2 pandemic has changed peoples’ behaviours, including the demand for NPS. The aim of the study was to assess both the frequency of intoxication with NPS in Łódź province over the period 2014–2020, and the impact of the COVID-19 pandemic on developing this trend. An analysis was carried out of data on intoxications in Łódź province in the years 2014–2020 reported by hospitals. The medical interventions rate (MI) per 100,000 people in the population was calculated. The frequency of intoxications was compared taking sociodemographic variables into account, and the effect of seasonal influence on intoxications was calculated using the Holt–Winter multiplicative seasonal method. In the period considered, there were 7175 acute NPS poisonings in the Łódź province and 25,495 in Poland. The averaged MI rate between 2014–2020 was 9.45 for Poland and 38.53 for the Łódź province, and the lowest value was found during the COVID pandemic in the year 2020 (respectively, 2.1 vs. 16.94). NPS users were mainly young men of 19–24 years old from a big city. Most cases were registered at weekends and in summer months. The majority of intoxications were caused by unidentified psychoactive substances of legal highs (chi2 = 513.98, p < 0.05). The actual number of NPS-related poisonings in the Łódź province in 2020 was lower than the value extrapolated from trend analysis of data between 2014–2019. NPS use in Poland decreased during the pandemic. It should be noted that a decrease in the number of drug-related incidents can have more than one reason, e.g., preventive programs, increased awareness, or changes in the law. This paper advocates that, in addition to monitoring NPS-related intoxications, there is further investigation into the social, cultural, and behavioural determinants of NPS to facilitate targeted prevention programmes and the development of new medical treatments.

A new depsidone from the neotricone-rich chemotype of the lichenised fungus Usnea fulvoreagens

Individuals of Usnea fulvoreagens (Parmeliaceae, lichenised Ascomycota), a shrubby corticolous species that is widespread in Europe, East Asia and North America, produce medullary lichen acids in several distinct chemotypic patterns. One such chemotype reportedly contains an unidentified substance as the major secondary metabolite. We isolated this compound from Californian specimens of U. fulvoreagens and identified it as the rare depsidone neotricone. A co-occurring compound, conneotricone, was identified as 4,10-dihydroxy-5-(hydroxymethyl)-8-methyl-3,7-dioxo-1,3-dihydro-7H-isobenzofuro[4,5-b][1,4]benzodioxepine-11-carboxylic acid by NMR and HPLC-UV-MSn comparison with the material synthesised from salazinic acid.

Identification of novel polar aryl hydrocarbon receptor agonists accumulated in liver of black-tailed gulls in Korea using advanced effect-directed analysis

Although bioaccumulation of persistent organic pollutants in seabirds has been examined, few studies have been conducted to identify previously unidentified substances. Here, aryl hydrocarbon receptor (AhR) agonists were identified in livers of black-tailed gulls from South Korea using effect-directed analysis combined with full-scan screening analysis. Significant AhR-mediated potencies were observed in the polar fractions of liver extracts using H4IIE-luc bioassay. Eight known polar AhR agonists accounted for 11–20% of the total AhR-mediated potencies in the polar fractions; hydrocortisone and rutaecarpine were the major contributors. Twenty-two AhR agonist candidates in the polar fractions were identified using liquid chromatography–quadrupole time-of-flight mass spectrometry during a six-step selection process. Of these, [10]-gingerol, angelicin, corticosterone, eupatilin, etofenprox, oxadixyl, and tretinoin were identified as novel AhR agonists. The contribution to potencies increased with inclusion of novel AhR agonists (27–52%); corticosterone and [10]-gingerol contributed significantly. Quantitative structure-activity relationship suggested that the novel AhR agonists have other potential toxic effects, including carcinogenicity and mutagenicity. Polar AhR agonists have been used for pharmaceuticals and pesticides. Some novel AhR agonists have log KOW > 2 and log KOA ≥ 6, which indicates that these compounds can be biomagnified in air-breathing organisms, such as seabirds.

Management of caustic pharyngoesophageal injuries in Korle Bu Teaching Hospital, Accra, Ghana: a 12-year retrospective review of 29 cases.

caustic pharyngoesophageal strictures are life-threatening injuries with important management difficulties, lacking clear therapeutic guidelines. The aim of this study is to evaluate the surgical procedures and outcomes of severe caustic pharyngoesophageal strictures in our institution. a total of 29 patients who underwent surgery for severe caustic pharyngoesophageal injury at the National Cardiothoracic Center from June 2006 to December 2018 were retrospectively reviewed. The age distribution, sex, management procedures, complications after surgery, and the outcome were analyzed. there were 17 males. The mean age was 11.7 years (range 2- 56 years). All patients accidentally swallowed caustic soda, except the oldest patient who ingested an unidentified substance. The treatment procedures included colopharyngoplasty in 15 (51.7%) patients, colon-flap augmentation pharyngoesophagoplasty (CFAP) in 10 (34.5%), and colopharyngoplasty with tracheostomy in 4 (13.8%). There was one case of graft obstruction from a retrosternal adhesive band and one case of postoperative reflux with nocturnal regurgitation. No cervical anastomotic leak occurred. Rehabilitative training for oral feeding was required for less than a month in most patients. Follow-up period ranged from one to twelve years. Four patients died within this period; two were immediate post-operative deaths and two occurred late. One patient was lost to follow-up. outcome of surgery for caustic pharyngoesophageal stricture is satisfactory. Colon-flap augmentation pharyngoesophagoplasty reduces the need for tracheostomy before surgery, and our patients start eating early without aspiration.

A Fast and Automated Strategy for the Identification and Risk Assessment of Unknown Substances (IAS/NIAS) in Plastic Food Contact Materials by GC-Q-Orbitrap HRMS: Recycled LDPE as a Proof-of-Concept.

A fast and automated approach has been developed for the tentative identification and risk assessment of unknown substances in plastic food contact materials (FCM) by GC-Q-Orbitrap HRMS. The proposed approach combines GC-HRMS full scan data acquisition coupled to Compound Discoverer™ 3.2 software for automated data processing and compound identification. To perform the tentative identification of the detected features, a restrictive set of identification criteria was used, including matching with the NIST Mass Spectral Library, exact mass of annotated fragments, and retention index calculation. After the tentative identification, a risk assessment of the identified substances was performed by using the threshold of toxicological concern (TTC) approach. This strategy has been applied to recycled low-density polyethylene (LDPE), which could be used as FCM, as a proof-of-concept demonstration. In the analyzed sample, 374 features were detected, of which 83 were tentatively identified after examination of the identification criteria. Most of these were additives, such as plasticizers, used in a wide variety of plastic applications, oligomers of LDPE, and substances with chemical, industrial, or cosmetic applications. The risk assessment was performed and, according to the TTC approach, the obtained results showed that there was no risk associated with the release of the identified substances. However, complementary studies related to the toxicity of the unidentified substances and the potential mixture toxicity (cocktail effects) should be conducted in parallel using bioassays.

Аналіз випадків смертельних отруєнь наркотичними та психотропними речовинами в Україні за результатами епідемічних, клінічних, судово-медичних і лабораторних досліджень (2015–2019 рр.)

Актуальність. На сьогодні в Україні гострі отруєння наркотичними та психотропними речовинами є вкрай актуальною медико-соціальною проблемою, далекою від вирішення. Мета дослідження — аналіз випадків смертельних отруєнь наркотичними та психотропними речовинами, спрямований на пошук заходів з підвищення ефективності системи охорони здоров’я з надання медичної допомоги при гострих побутових отруєннях. Матеріали та методи. Досліджено медичні дані пацієнтів з діагнозом «гостре наркотичне отруєння» (Міжнародна класифікація хвороб 10-го перегляду: Т40.0–Т40.3); дані Державної служби статистики України та Центру медичної статистики Міністерства охорони здоров’я України; звіти бюро судово-медичних експертиз. Лабораторні дослідження здійснено за допомогою імунохроматографічного аналізу і хромато-мас-спектрометрії (прилад — Aligent 6850/5973N, колонка — HP-5MS). Використана програма Statistica 12.6 (Windows 10/7). Результати. За 2015–2019 рр. в лабораторії Київського токсикологічного центру було виявлено більше 40 груп речовин, що призвели до гострих отруєнь, а кількість позитивних тестів зросла в 2,3 раза. Лідерами в структурі наркотиків визначені метадон, героїн і морфін. За 2014–2018 рр. в Україні зареєстровано 1365 смертей внаслідок отруєнь наркотичними та психотропними речовинами, зокрема у 2018 році — 399 випадків, 90,5 % становили чоловіки (361 випадок) та 9,5 % — жінки (38 випадків). Серед 355 випадків смертей отруєння опіоїдами становили 153 (кодеїн та морфін — 54 випадки (43,1 %), метадон — 76 випадків (21,4 %), опій — 15 випадків (4,2 %), синтетичні опіоїди — 8 випадків (2,3 %)). Серед 144 випадків смертей від отруєнь іншими наркотиками 31 (21,5 %) — отруєння психодислептиками (галюциногенами), 2 (1,4 %) — отруєння кокаїном та 5 (3,5 %) — отруєння психостимуляторами. Кількість смертей у 2018 році порівняно з даними 2017 року зросла в 1,5 раза, отруєння метадоном — у 2,5 раза, а отруєння неідентифікованими наркотиками — у 3 рази. В Україні у 2018 році частота смертей, пов’язаних зі вживанням наркотичних та психотропних речовин, та отруєнь ними серед населення віком від 15 до 64 років становила 10 осіб на кожен 1 000 000 населення. Висновки. Результати досліджень, здійснених різними державними установами в період 2014–2019 рр., свідчать про загрозливу динаміку збільшення як числа випадків отруєнь наркотичними та психотропними речовинами, так і збільшення їх різноманіття, наслідком чого є прогресивне зростання показників летальності і смертності, переважно серед населення чоловічої статі віком 25–44 років.