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  • 1995-1999  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Redox enzyme linked electrochemical sensors: Theory meets practice (1995)
    Springer
    Microchimica acta 121 (1995), S. 119-145 
    Details
    ISSN: 1436-5073
    Keywords: enzyme-biosensors ; immobilizations ; theoretical models ; deposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Information from theoretical models of redox enzyme linked biosensors highlights the importance of membrane thickness and enzyme loading on signal response in regard to both sensitivity and reproducibility. The conclusions are substantiated by examination of practical examples in the literature and, with a view to the importance of the character of the enzyme layer and overlayers, immobilization techniques are assessed which are in current use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01248246
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Acrylate polymer immobilisation of enzymes (1999)
    Springer
    Fresenius' journal of analytical chemistry 364 (1999), S. 58-65 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A rotating disk electrode analysis of pin-holes in polymer membrane coverings is described and the results correlated with the performance of the polymers when used as immobilisation matrices for enzymes in amperometric biosensors. The polymer family chosen for study is that of the acrylates and two preparations are considered via bulk polymerisation and emulsion polymerisation. In the latter case PVA present in the polymerisation may form ‘diffusion channels’ in the deposited film. For the bulk polymers it is found that better signal response is obtained for pin-hole rich polymers, leading to the conclusion that transport of analyte/measurand is through the pin-holes. A pin-hole free polymer can be produced by inclusion of plasticiser or producing polymers with more ‘elastic’ properties (e.g. lower Tg). However, these polymers show poor permeability to analyte/measurand. The emulsion polymers can be produced with another component, e.g. PVA which may create diffusion channels. Polymers which show pin-hole behaviour in this class have hole-diffusion properties which are different to solution and comparable to a PVA ‘solution’. This approach may provide a means of optimising both immobilisation polymer matrix and diffusion channels for a biosensor, although the underlying correlation to permeability was found to be the pin-hole population rather than the hydrophilic-hydrophobic balance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051301
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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