Proceedings of MatricesFor IITTEP – ICoMaNSEd 2015
ISBN: 978-602-74204-0-3
Keynote Invited Papers Page 23
Figure 5. Correlation plot for uric acid values in food samples as determined by the present uric acid biosensor and by the standard spectrophotometric method. The best fit line is drown.
9. Formaldehyde Sensor
The design of chemical sensor for the determination of formaldehyde in UV-Vis spectrophotometric detection is another example. The research is aimed to obtain accurate,
selective, sensitive, fast response and simple analytic instrument for the determination of formaldehyde. Sensor development is carried out by immobilization of active material of
chromatophic acid in a polytyramine polymer matrix that can react selectively with formaldehyde to produce color compounds which is then detected in UV-Vis
Spectrophotometer. The details of the study is explained in references [32].
10. Immobilization of Chromatopic Acid onto Conducting Plastic
Polytyramine matrixes is provided from monomer tyramine by electrodeposition techniques similar to that explained in the references [21-24]. The electropolymerization is carried out at
10 sweep cycles by using cyclic voltammetry CV and at the same time the chromatophic acid is immobilised in polytyramine film. Typical electropolymerization of polytyramine is
shown in Figure 5a, and the amount of deposited polymer in the conducting plastic surface is presented in Figure 5b. The amount of polytyramine deposited in conducting plastic surface is
increased as the number of electropolymerization CV increased. An active material of chromatophic acid is also entrapped in the suface of conducting plastic by the aid of
polytyramine polymer. The deposited polytyramin is transparent that can be used for spectrophotometry detection system. The chromatophic acid is entrapped in conducting
plastic surface followed by laminating to block specific area for optic measurement, and is then situated vertically in quartz cuvette and compatible in UV-Vis spectrophotometry
detection system.
Figure 5. a Electropolymerization of tyramine and immobilization of chropatopic acid onto a surface of conducing plastic in a solution of 0.1 M tyramin dan 0,01M HCl at 0.0 V and +1.6 V vs AgAgCl, b The
amount mmol of deposited polytyramin during electropolymerization sweep cycle.
y = 0,824x + 0,1763 R² = 0,8037
0,00 1,00
2,00 3,00
4,00 5,00
0,00 1,00
2,00 3,00
4,00 5,00
S p
e ct
ro p
h o
to m
e tr
y U
ri
c a
ci d
m M
1 g
sa m
p le
BiosensorUric Acid mM100 g Sample
Proceedings of MatricesFor IITTEP – ICoMaNSEd 2015
ISBN: 978-602-74204-0-3
Keynote Invited Papers Page 24
11. Response of Formaldehyde Sensor
