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Nanoscale ; 13(43): 18084-18088, 2021 Nov 11.
Article in English | MEDLINE | ID: covidwho-1500761


This communication describes a novel water-soluble membrane prepared from chitosan intended for SARS-CoV-2 viral nucleic acid collection and detection. The CSH membrane formed from nanofibers shows promising potential in the quantitative determination of the SARS-CoV-2 viral nucleic acids at a concentration of 102 copies per L in air. The sponge-like structure which allows gas to pass through for collection of viral nucleic acids potentially provides simple, fast, and reliable sampling as well as detection of various types of airborne viruses.

COVID-19 , Nucleic Acids , Humans , RNA, Viral , SARS-CoV-2 , Specimen Handling , Water
Nanoscale ; 13(22): 10133-10142, 2021 Jun 14.
Article in English | MEDLINE | ID: covidwho-1249216


Efficient point-of-care diagnosis of severe acute respiratory syndrome-corovavirus-2 (SARS-CoV-2) is crucial for the early control of novel coronavirus infections. At present, polymerase chain reaction (PCR) is primarily used to detect SARS-CoV-2. Despite the high sensitivity, the PCR process is time-consuming and complex which limits its applicability for rapid testing of large-scale outbreaks. Here, we propose a rapid and easy-to-implement approach for SARS-CoV-2 detection based on surface enhanced infrared absorption (SEIRA) spectroscopy. The evaporated gold nano-island films are used as SEIRA substrates which are functionalized with the single-stranded DNA probes for specific binding to selected SARS-CoV-2 genomic sequences. The infrared absorption spectra are analyzed using the principal component analysis method to identify the key characteristic differences between infected and control samples. The SEIRA-based biosensor demonstrates rapid detection of SARS-CoV-2, completing the detection of 1 µM viral nucleic acids within less than 5 min without any amplification. When combined with the recombinase polymerase amplification treatment, the detection capability of 2.98 copies per µL (5 aM) can be completed within 30 min. This approach provides a simple and economical alternative for COVID-19 diagnosis, which can be potentially useful in monitoring and controlling future pandemics in a timely manner.

COVID-19 , Nucleic Acids , COVID-19 Testing , Humans , Nucleic Acid Amplification Techniques , RNA, Viral , SARS-CoV-2 , Sensitivity and Specificity , Spectrum Analysis
Chem Soc Rev ; 50(6): 3656-3676, 2021 Mar 21.
Article in English | MEDLINE | ID: covidwho-1132110


The novel human infectious coronaviruses (CoVs) responsible for severe respiratory syndromes have raised concerns owing to the global public health emergencies they have caused repeatedly over the past two decades. However, the ongoing coronavirus disease 2019 (COVID-19) pandemic induced by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has received unprecedented attention internationally. Monitoring pathogenic CoVs in environmental compartments has been proposed as a promising strategy in preventing the environmental spread and tracing of infectious diseases, but a lack of reliable and efficient detection techniques is still a significant challenge. Moreover, the lack of information regarding the monitoring methodology may pose a barrier to primary researchers. Here, we provide a systematic introduction focused on the detection of CoVs in various environmental matrices, comprehensively involving methods and techniques of sampling, pretreatment, and analysis. Furthermore, the review addresses the challenges and potential improvements in virus detection techniques for environmental surveillance.

COVID-19 Testing/methods , COVID-19/diagnosis , COVID-19/epidemiology , Environmental Monitoring/methods , Pandemics , SARS-CoV-2/isolation & purification , Aerosols/analysis , COVID-19/transmission , Fomites/virology , High-Throughput Nucleotide Sequencing , Humans , Immunoassay , Quality Control , SARS-CoV-2/genetics , SARS-CoV-2/immunology , Sewage/virology , Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization , Waste Water/virology