Please use this identifier to cite or link to this item:
Title: Effectiveness of SDST as a "self-disinfecting" disinfectant
Authors: Chua, Lauryn Zhi En
Keywords: Engineering::Civil engineering
Issue Date: 2023
Publisher: Nanyang Technological University
Source: Chua, L. Z. E. (2023). Effectiveness of SDST as a "self-disinfecting" disinfectant. Final Year Project (FYP), Nanyang Technological University, Singapore.
Abstract: For the past two years, the world experienced a global pandemic caused by the infectious Covid-19 disease, stemming from Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). When the virus reached the shores of Singapore, various measures were put in place to minimize the transmission rates in public settings. One such safety measure included the use of a spray-on disinfecting coating on high-touchpoint surfaces like the lift panels in housing flats. One of the disinfectants was called SDST and was marketed to have self-disinfecting properties. However, no scientific publications were produced to justify its claims. A previous FYP study that tested the effectiveness of the SDST disinfectant against repetitive loadings of bacteria was unable to strongly establish its efficiency due to unreliable findings. The study suggested that the method of testing contributed to the flawed results and therefore advised a different sampling and analysis method to be utilized instead. This study aims to evaluate the effectiveness of SDST as a disinfectant by measuring its disinfection efficiency under different conditions. E. coli bacteria was used as a substitute of the Covid-19 virus due to safety and accessibility reasons. Using stainless-steel plates of the same grade as lift panels, E. coli suspensions at different growth phase and concentrations were attached to the plates and left to dry. Wiping of the plates were performed at varying intervals of every day, every 3 days, and every 7 days. The ATP (adenosine triphosphate) test method was then used to collect and analyze samples. The overall result presented averages of 90% disinfection efficiency for daily wiping conditions and 80% for weekly wiping conditions. Cleaning frequency of once a day was proposed according to the results of this study.
Schools: School of Civil and Environmental Engineering 
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:CEE Student Reports (FYP/IA/PA/PI)

Files in This Item:
File Description SizeFormat 
Final FYP Report.pdf
  Restricted Access
2.26 MBAdobe PDFView/Open

Page view(s)

Updated on Apr 14, 2024


Updated on Apr 14, 2024

Google ScholarTM


Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.