Biosensorsystem för övervakning av vattenkvalitet
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Sweden's drinking water quality is considered to be high partly due to a high quality of the raw water and a well developed sewage infrastructure. Despite this, there is water contamination that could be prevented by installation of a sophisticated early warning system. Some of the major players in the production of drinking water have already invested in different types of early warning systems to ensure drinking water of high quality. There are various forms of early warning systems where automatic monitoring of E. Coli is an interesting alternative. Today's technology allows for this type of measurement, but it is often expensive and sometimes slow.
This work aims to investigate whether the phenomenon of Extraordinary Optical Transmission (EOT) can be used as the technology of sensors for real-time measurement of indicators of fecal contaminated water. EOT is a transmissions peak which arises due to plasmon resonance. The study was conducted by performing verification measurements by spectrophotometry to detect the EOT. After this biomeasurements where done to show that the surface of the sample can be functionalized to provide the opportunity to choose which analytes should be detected.
The verifying measurements showed that EOT was detected for one of the five samples where the hole size was 400 nm and the hole spacing was 600 nm. This is due to the high signal strength and to the fact that the phenomenon occurred within the measurement range of the instruments. Samples where designated with the name sPa where s indicates hole size in nm and a hole spacing in nm. The signal strength of the sample 140P600 and 200P600 was too low to determine whether EOT occurred. For samples 400P1000 and 600P1000 calculations showed that EOT occurred outside the measurement range, which meant that EOT could not be measured. Sample 400P600 was chosen to implement bio-measurements wherein the surface was functionalized with biotin Bovine serum albumin (B-BSA) to later bind with fluidMAG Streptavidin. Both B-BSA and streptavidin was bound as shown by the kinetic measurements.
Place, publisher, year, edition, pages
2012. , 35 p.
UPTEC W, ISSN 1401-5765 ; 12025
Extraordinary transmission effect (EOT), plasmon, drinking water, real time measurement
Extraordinary transmission effect (EOT), plasmon, dricksvatten, realtidsmätning
IdentifiersURN: urn:nbn:se:uu:diva-183870OAI: oai:DiVA.org:uu-183870DiVA: diva2:564883
Master Programme in Environmental and Water Engineering
Olofsson, Linda, PhD
Carlsson, Bengt, Prof.Rodhe, Allan, Prof.