• Title/Summary/Keyword: Lateral flow test strip

Search Result 12, Processing Time 0.015 seconds

Sputum Processing Method for Lateral Flow Immunochromatographic Assays to Detect Coronaviruses

  • Aram Kang;Minjoo Yeom;Hyekwon Kim;Sun-Woo Yoon;Dae-Gwin Jeong;Hyong-Joon Moon;Kwang-Soo Lyoo;Woonsung Na;Daesub Song
    • IMMUNE NETWORK
    • /
    • v.21 no.1
    • /
    • pp.11.1-11.10
    • /
    • 2021
  • Coronavirus causes an infectious disease in various species and crosses the species barriers leading to the outbreak of zoonotic diseases. Due to the respiratory diseases are mainly caused in humans and viruses are replicated and excreted through the respiratory tract, the nasal fluid and sputum are mainly used for diagnosis. Early diagnosis of coronavirus plays an important role in preventing its spread and is essential for quarantine policies. For rapid decision and prompt triage of infected host, the immunochromatographic assay (ICA) has been widely used for point of care testing. However, when the ICA is applied to an expectorated sputum in which antigens are present, the viscosity of sputum interferes with the migration of the antigens on the test strip. To overcome this limitation, it is necessary to use a mucolytic agent without affecting the antigens. In this study, we combined known mucolytic agents to lower the viscosity of sputum and applied that to alpha and beta coronavirus, porcine epidemic diarrhea virus (PEDV) and Middle East respiratory syndrome coronavirus (MERS-CoV), respectively, spiked in sputum to find optimal pretreatment conditions. The pretreatment method using tris(2-carboxyethyl)phosphine (TCEP) and BSA was suitable for ICA diagnosis of sputum samples spiked with PEDV and MERS-CoV. This sensitive assay for the detection of coronavirus in sputum provides an useful information for the diagnosis of pathogen in low respiratory tract.

Effect of Heat, Pressure, and Acid Treatments on DNA and Protein Stability in GM Soybean (GM 콩 DNA와 단백질의 안정성에 대한 열, 압력 및 산 처리의 영향)

  • Pack, In-Soon;Jeong, Soon-Chun;Yoon, Won-Kee;Park, Sang-Kyu;Youk, Eun-Soo;Kim, Hwan-Mook
    • Korean Journal of Food Science and Technology
    • /
    • v.36 no.4
    • /
    • pp.677-682
    • /
    • 2004
  • Debates on safety of genetically modified (GM) crops have led to mandatory-labeling legislation of GM foods in many countries including Korea. Effects of heat, pressure, and acid treatments on degradation of DNAs or proteins in GM soybean at levels below detection limits of qualitative PCR and lateral flow strip test (LFST) methods were examined. Results showed that genomic DNAs and proteins were degraded into fragment sizes no longer possible for detection of inserted gene depending on thermal, or thermal and pressure treatment period. Detectaability of LFST for toasted meal increased in weakly treated soybean. DNA and protein detection methods were barely effective for detection of GM ingredient after $121^{\circ}C$ and 1.5 atmospheric treatment for 20 min. These results will be useful in determining GM labeling requirements of processed foods.