pengaruh asam amino pada proses elektropolimerisasi pirol

PENGARUH ASAM AMINO PADA
PROSES ELEKTROPOLIMERISASI PIROL
TESTS
Oien
ADHITASARI SURATMAN
20501006
BIDANG KHUSUS KIMIA ANALITIK
PROGRAM STUDI KIMIA
PROGRAM PASCASARJANA
INSTITUT TEKNOLOGI BANDUNG
2003
Dr. I3uchari
NIP.130518666
Dr. Indra Noviandri
NIP. 131933271
ABSTRAK
Telah dipelajari proses elektropolimerisasi pirol serta sifat
elektrokimia polipirol sebagai polimer elektroaktif dengan teknik
voltametri siklis. Pirol dielektropolimerisasi membentuk polipirol
dalam pelarut air dan elektrolit pendukung NaC10 4 pada beberapa
nilai pH. Variasi pH dilakukan dengan menggunakan bufer Britton
Robinson. pH terbaik bagi proses elektropolimerisasi pirol yang
dilakukan pada daerah potensial 0 - 1100 mV terhadap Ag/AgCl
dan laju selusur 100 mV/s adalah pH alami pirol clan pH 2-6.
Dalam penelitian ini, asam amino digunakan sebagai biomolekul
yang mudah dimuat clan dilepaskan dari polipirol. Keberadaan asam
amino selama proses elektropolimerisasi pirol menyebabkan
menurunnya laju pertumbuhan polipirol. Penurunan pertumbuhan
polipirol diperbesar bila konsentrasi clan berat molekul asam amino
dalam larutan semakin besar. Respon voltametrik asam amino yang
ditransfer dalam membran polipirol dalam larutan asam amino
memenuhi persamaan Nernst. Hal ini menunjukkan bahwa polipirol
dapat digunakan sebagai sensor asam amino, yaitu untuk membranmembran yang disintesis pada pH alami pirol clan pH 2.
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ABSTRACT
Electropolymerization processes and electrochemical
properties of polypyrrole as electroactive polymer have been
studied by cyclic voltammetry technique. Pyrrole was
electropolymerized to form polypyrrole in water based solvent
containing sodium perchlorate as supporting electrolyte in several
pH values. pH of the solutions varied by using Britton Robinson
buffer. Electropolymerization processes were carried out within
potential range 0-1100 mV vs Ag/AgCl reference electrode and at
the scanning rate of 100 mV/s. In this study, amino acids have been
used as biomolecules which could easily be loaded on and released
from polypyrrole. The presence of amino acid during
electropolymerization
process
reduced
the
rate
of
electropolymerization of polypyrrole. The effect increased along
with the increasing of concentration and molecular weight of amino
acid in the solution. Voltammetric responses of amino acid
transfered into polypyrrole membrane from the solution containing
amino acid were found to be Nernstian. The result indicated that
polypyrrole could be used as sensor of amino acids, i.e. for the
membranes synthesized at pyrrole's natural pH and at pH 2.
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