Can r-graphene oxide replace the noble metals in SERS studies: the detection of acrylamide

2016 ◽  
Vol 13 (1) ◽  
pp. 58 ◽  
Author(s):  
Elad Segal ◽  
Aharon Gedanken
Keyword(s):  
Drinking Water ◽  
Graphene Oxide ◽  
Noble Metals ◽  
Surface Enhanced Raman Spectroscopy ◽  
World Health ◽  
The European Union ◽  
Food And Agriculture ◽  
Low Concentrations ◽  
Surface Enhanced Raman ◽  
Health Organization

Environmental context The need for detecting and sensing hazardous materials that can contaminate our food and water is growing each and every year. Regulation of these contaminants to safeguard human health depends on the ability to detect them at ultra-low concentrations in the environment. This work proposes a simple and efficient substrate preparation for detecting acrylamide, a toxic and carcinogenic material usually found in drinking water. Abstract Polyacrylamide acts as a very common water purifier worldwide. Unfortunately, it leaves hazardous and toxic residues of its monomer, acrylamide (C3H5NO), in water sources. The World Health Organization (WHO), the Food and Agriculture Organisation of the United Nations (FAO) and the European Union (EU) set the maximum contaminant level of acrylamide in drinking water to 0.1–0.5µgL–1. This environmental risk encouraged our efforts to develop surface-enhanced Raman spectroscopy (SERS) probes that are easy and simple to fabricate, and also have superb detection ability. We report down to 0.071µgL–1 acrylamide detection with good reproducibility, which is even lower than the WHO, FAO and EU requirements, and may be used as a powerful analytical alternative for detection. In this manuscript, we present a practical route to fabricate these detection substrates for detection of ultra-low concentrations of aqueous acrylamide solutions. The facile method is based on deposition of graphene oxide on Si wafers by ultrasonication, followed by surface reduction. These substrates require no adhesion layer or pretreatment with O2 plasma or aminopropyl triethoxysilane for the coating process. Sonochemical deposition of silver nanoparticles on the substrates is also carried out and the product compared with the proposed Si–reduced graphene oxide wafers.

scholarly journals Development of the Troponin Detection System Based on the Nanostructure

Micromachines ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 203 ◽  
Author(s):  
Taek Lee ◽  
Jae-Hyuk Ahn ◽  
Jinha Choi ◽  
Yeonju Lee ◽  
Jin-Myung Kim ◽  
...  
Keyword(s):  
Detection System ◽  
Surface Enhanced Raman Spectroscopy ◽  
The Body ◽  
World Health ◽  
Detection Techniques ◽  
Number Of Patients ◽  
Creatine Kinase Mb ◽  
High Death ◽  
Surface Enhanced Raman ◽  
Health Organization

During the last 30 years, the World Health Organization (WHO) reported a gradual increase in the number of patients with cardiovascular disease (CVD), not only in developed but also in developing countries. In particular, acute myocardial infarction (AMI) is one of the severe CVDs because of the high death rate, damage to the body, and various complications. During these harmful effects, rapid diagnosis of AMI is key for saving patients with CVD in an emergency. The prompt diagnosis and proper treatment of patients with AMI are important to increase the survival rate of these patients. To treat patients with AMI quickly, detection of a CVD biomarker at an ultra-low concentration is essential. Cardiac troponins (cTNs), cardiac myoglobin (cMB), and creatine kinase MB are typical biomarkers for AMI detection. An increase in the levels of those biomarkers in blood implies damage to cardiomyocytes and thus is related to AMI progression. In particular, cTNs are regarded as a gold standard biomarker for AMI diagnosis. The conventional TN detection system for detection of AMI requires long measurement time and is labor-intensive and tedious. Therefore, the demand for sensitive and selective TN detection techniques is increasing at present. To meet this demand, several approaches and methods have been applied to develop a TN detection system based on a nanostructure. In the present review, the authors reviewed recent advances in TN biosensors with a focus on four detection systems: (1) An electrochemical (EC) TN nanobiosensor, (2) field effect transistor (FET)-based TN nanobiosensor, (3) surface plasmon resonance (SPR)-based TN nanobiosensor and (4) surface enhanced Raman spectroscopy (SERS)-based TN nanobiosensor.

scholarly journals Synthesis of iron oxyhydroxide-coated rice straw (IOC-RS) and its application in arsenic(V) removal from water

2015 ◽  
Vol 13 (3) ◽  
pp. 726-736 ◽  
Author(s):  
Igor W. K. Ouédraogo ◽  
Erol Pehlivan ◽  
Hien T. Tran ◽  
Yvonne L. Bonzi-Coulibaly ◽  
Dieter Zachmann ◽  
...  
Keyword(s):  
Drinking Water ◽  
Rice Straw ◽  
World Health ◽  
Iron Oxyhydroxide ◽  
Thermogravimetric Analyzer ◽  
Low Concentrations ◽  
Equilibrium Data ◽  
Health Organization ◽  
Batch Data ◽  
Better Than

Because of the recognition that arsenic (As) at low concentrations in drinking water causes severe health effects, the technologies of As removal have become increasingly important. In this study, a simplified and effective method was used to immobilize iron oxyhydroxide onto a pretreated naturally occurring rice straw (RS). The modified RS adsorbent was characterized, using scanning electron microscope, Fourier transform infrared spectroscopy, thermogravimetric analyzer, and surface area analyzer. Experimental batch data of As(V) adsorption were modeled by the isotherms and kinetics models. Although all isotherms, the Langmuir model fitted the equilibrium data better than Freundlich and Dubinin–Radushkevich models and confirmed the surface homogeneity of adsorbent. The iron oxyhydroxide-coated rice straw (IOC-RS) was found to be effective for the removal of As(V) with 98.5% sorption efficiency at a concentration of <50 mg/L of As(V) solution, and thus maximum uptake capacity is ∼22 and 20 mg As(V)/g of IOC-RS at pH 4 and 6, respectively. The present study might provide new avenues to achieve the As concentrations required for drinking water recommended by the World Health Organization.

scholarly journals Method for Determining the Probability of a Lack of Water Supply to Consumers

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5361
Author(s):  
Dawid Szpak
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Water Distribution ◽  
Supply System ◽  
Water Supply System ◽  
World Health ◽  
The European Union ◽  
Health Organization ◽  
Safety Of Drinking Water ◽  
Type Of Failure

The water distribution subsystem is the most failing subsystem included in the water supply system. One of the main consequences of water supply failures is the lack of water supply to consumers, which is always very onerous. The paper presents a method of determining the conditional probability that a break in the supply of water to consumers of a certain duration will be caused by a specific type of failure. The result of the work was to identify water supply network failures that result in the longest water supply suspension time. The method was presented on a real water supply system. In order to reduce the incidence of long-term interruptions in water supply, water supply companies should mainly continue replacing gray cast iron pipes with thermoplastic materials. Actions taken to increase the safety of drinking water supply meet the current standards for the safety of drinking water, developed by the World Health Organization and the European Union.

scholarly journals Trace Cd2+ Ions Detection on the Flower-Like Ag@CuO Substrate

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1664
Author(s):  
Mingming Cheng ◽  
Chenyan Li ◽  
Weijun Li ◽  
Yingkai Liu
Keyword(s):  
Drinking Water ◽  
Environmental Protection Agency ◽  
Limit Of Detection ◽  
World Health ◽  
Sers Substrate ◽  
Facile Hydrothermal Method ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Health Organization

CuO flower-like material (FM) was prepared via the facile hydrothermal method, and Ag nanoparticles were deposited on the CuO FM to obtain Ag@CuO composite. Rhodamine 6G (R6G) was used as the probe molecule on Ag@CuO FM substrate to study surface enhanced Raman scattering (SERS). It is discovered that it exhibited an excellent SERS performance with limit of detection of 3.58 × 10−16 M and enhancement factor (EF) of 3.99 × 1010. More importantly, we used it as a SERS substrate to detect cadmium ions and found that its limit of detection (LOD) reaches up to 2.6 × 10−8 M, which is lower than the highest allowable Cd2+ concentration in drinking water set by the World Health Organization (WHO) and Environmental Protection Agency (EPA). Therefore, the proposed composite can be applicable to the detection of Cd2+ in drinking water and in soil.

Food and Feed Safety Assessment: The Importance of Proper Sampling

2015 ◽  
Vol 98 (2) ◽  
pp. 252-258 ◽  
Author(s):  
Harry A Kuiper ◽  
Claudia Paoletti
Keyword(s):  
Risk Assessment ◽  
Safety Assessment ◽  
Hazard Identification ◽  
World Health ◽  
The European Union ◽  
Potential Health ◽  
Food And Agriculture ◽  
Food And Feed ◽  
Health Organization ◽  
Feed Safety

Abstract The general principles for safety and nutritional evaluation of foods and feed and the potential health risks associated with hazardous compounds are described as developed by the Food and Agriculture Organization (FAO) and the World Health Organization (WHO) and further elaborated in the European Union-funded project Safe Foods. We underline the crucial roleof sampling in foods/feed safety assessment. High quality sampling should always be applied to ensure the use of adequate and representative samples as testmaterials for hazard identification, toxicologicaland nutritional characterization of identified hazards, as well as for estimating quantitative and reliable exposure levels of foods/feed or related compoundsof concern for humans and animals. The importance ofrepresentative sampling is emphasized through examples of risk analyses in different areas of foods/feedproduction. The Theory of Sampling (TOS) is recognized as the only framework within which to ensure accuracy and precision of all sampling steps involved inthe field-to-fork continuum, which is crucial to monitor foods and feed safety. Therefore, TOS mustbe integrated in the well-established FAO/WHO risk assessment approach in order to guarantee a transparent and correct frame for the risk assessment and decisionmaking process.

Presence and risk assessment of pharmaceuticals in surface water and drinking water

2011 ◽  
Vol 63 (10) ◽  
pp. 2143-2148 ◽  
Author(s):  
Hans Sanderson
Keyword(s):  
Drinking Water ◽  
Surface Waters ◽  
Great Depth ◽  
World Health ◽  
Long Term Effects ◽  
The Public ◽  
Low Concentrations ◽  
Health Organization ◽  
State Of The Science

Trace amounts of pharmaceuticals have been detected in surface waters in the nano- to microgram per liter range, and in drinking water in the nanogram/L range. The environmental risks of pharmaceuticals in surface waters have been evaluated and generally found to be low if the wastewater is treated before release to the environment. The human health risks of trace amounts of pharmaceuticals in drinking water have however not been evaluated in any great depth. Preliminary screening level assessments suggest risk to be low – but the public and decision-makers are concerned and would like the matter investigated more thoroughly, especially with regards to mixture effects, chronic long-term effects and sensitive sub-populations. The World Health Organization is currently evaluating the need for credible health based guidance associated with low concentrations of pharmaceuticals in drinking water. The aim of this paper is to summarize the state-of-the-science and the ongoing international debate on the topic.

scholarly journals Nanoelements in Mendeleev’s Periodic Table. Copper Subgroup

Vestnik RFFI ◽  
2019 ◽  
pp. 46-57
Author(s):  
Anna A. Semenova ◽  
Evelina I. Nikelshparg ◽  
Nadezhda A. Brazhe ◽  
Irina A. Veselova ◽  
Eugene A. Goodilin
Keyword(s):  
Periodic Table ◽  
Noble Metals ◽  
Analytical Techniques ◽  
Surface Enhanced Raman Spectroscopy ◽  
High Tech ◽  
Time Resolved ◽  
Cell Structures ◽  
Low Concentrations ◽  
Surface Enhanced Raman ◽  
Biomedical Diagnostics

The 150th anniversary of the Mendeleev’s Periodic Table of elements requires scientists to rethink the outstanding role of this fundamental law in modern areas of chemistry, including such interdisciplinary and high-tech fields as nanochemistry and nanomaterials. The situation analysis shows that the most “nanotechnologically” popular elements belong to 1st, 2nd and partially to the 3rd periods, wherein a special practically important role is played by the noble metals because of their clear «specialization» in the development and implementation of new analytical techniques, in particular, the surface-enhanced Raman spectroscopy (SERS). There is an obvious need to develop and introduce fundamentally new, unique approaches and tools for the analysis of functioning living tissue structures. And SERS is precisely such a method, which implements multiplex, nonivasive spatially- and time-resolved control of chromoproteins at the extremely low concentrations in small volumes of samples of biological objects (tissues, cells, cell structures / organelles), and is an important innovative method of practical biomedical diagnostics.

Drinking-Water Quality and Intestinal Infectious Diseases in a Colombian Department, 2010-2016

2020 ◽  
pp. 21-29
Author(s):  
Dora Cardona Rivas ◽  
Militza Yulain Cardona Guzmán ◽  
Olga Lucía Ocampo López
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Infectious Diseases ◽  
Disease Burden ◽  
Social Protection ◽  
Drinking Water Quality ◽  
World Health ◽  
The Social ◽  
Etiological Agents ◽  
Health Organization

Objective: To characterize the burden of intestinal infectious diseases attributable to drinking-water quality in 27 municipalities in the central region of Colombia. Materials and methods: A time-trend ecological study. The drinking-water quality of the National Institute of Health and the Institute of Hydrology, Meteorology and Environmental Studies was identified. The disease burden was calculated based on the mortality registered in the National Department of Statistics and the records of morbidity attended by the Social Protection Integrated Information System. The etiological agents reported in morbidity records and the observation of environmental conditions in the municipalities of the study were included. The disease burden was determined according to the methodology recommended by the World Health Organization (WHO).

Graphene and Graphene Oxide Applications for SERS Sensing and Imaging

2019 ◽  
Vol 26 (38) ◽  
pp. 6878-6895 ◽  
Author(s):  
Anna Jabłońska ◽  
Aleksandra Jaworska ◽  
Mateusz Kasztelan ◽  
Sylwia Berbeć ◽  
Barbara Pałys
Keyword(s):  
Graphene Oxide ◽  
Surface Enhanced Raman Spectroscopy ◽  
Biological Species ◽  
Chemical Mechanism ◽  
Aromatic Molecules ◽  
Sers Enhancement ◽  
Reduced Graphene ◽  
Surface Enhanced Raman ◽  
Active Nanoparticles ◽  
Fluorescence Quencher

: Surface Enhanced Raman Spectroscopy (SERS) has a long history as an ultrasensitive platform for the detection of biological species from small aromatic molecules to complex biological systems as circulating tumor cells. Thanks to unique properties of graphene, the range of SERS applications has largely expanded. Graphene is efficient fluorescence quencher improving quality of Raman spectra. It contributes also to the SERS enhancement factor through the chemical mechanism. In turn, the chemical flexibility of Reduced Graphene Oxide (RGO) enables tunable adsorption of molecules or cells on SERS active surfaces. Graphene oxide composites with SERS active nanoparticles have been also applied for Raman imaging of cells. This review presents a survey of SERS assays employing graphene or RGO emphasizing the improvement of SERS enhancement brought by graphene or RGO. The structure and physical properties of graphene and RGO will be discussed too.

scholarly journals Assessment of drinking water contamination in food stalls of Jashore Municipality, Bangladesh

2021 ◽  
Vol 11 (8) ◽  
Author(s):  
Molla Rahman Shaibur ◽  
Mohammed Sadid Hossain ◽  
Shirina Khatun ◽  
F. K. Sayema Tanzia
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
World Health Organization ◽  
Fast Food ◽  
Pathogenic Bacteria ◽  
Permissible Limit ◽  
World Health ◽  
Drinking Water Contamination ◽  
The World ◽  
Health Organization

AbstractThis study aimed to determine the quality of drinking water supplied in different types of food stalls in Jashore Municipality, Bangladesh. A total of 35 water samples were collected from different tea stalls, street side fast food stalls, normal restaurants and well-furnished restaurants. The water quality was evaluated by determining the distinct physical, chemical and biological parameters. The results revealed that the water used in the food stalls and restaurants for drinking purpose was in desired quality in terms of turbidity, electrical conductivity, pH, total dissolved solids, nitrate (NO3−), sulfate (SO42−), phosphate (PO43−), chloride (Cl−), sodium (Na) and potassium (K) concentrations. The values were within the permissible limit proposed by the Bangladesh Bureau of Statistics and the World Health Organization. Concentrations of calcium (Ca) and magnesium (Mg) found in several samples were higher than the World Health Organization standard. Iron (Fe) concentrations were higher than the permissible limit of the World Health Organization. Only 46% exceeded the permissible limit of Bangladesh Bureau Statistics. The threatening result was that the samples were contaminated by fecal coliform, indicating that the people of Jashore Municipality may have a greater chance of being affected by pathogenic bacteria. The drinking water provided in the street side fast food stalls was biologically contaminated. The findings demonstrate that the drinking water used in food stalls and restaurants of Jashore Municipality did not meet up the potable drinking water quality standards and therefore was detrimental to public health.

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