J 2004

Využití katalytických reakcí na rtuťové elektrodě pro elektrochemické stanovení metalothioneinů

KIZEK, René, Jan VACEK, Libuše TRNKOVÁ, Bořivoj KLEJDUS, Ladislav HAVEL et. al.

Základní údaje

Originální název

Využití katalytických reakcí na rtuťové elektrodě pro elektrochemické stanovení metalothioneinů

Název anglicky

Utilization of catalytic reactions on mercury electrode for the electrochemical determination of metalothioneins

Autoři

KIZEK, René (203 Česká republika), Jan VACEK (203 Česká republika), Libuše TRNKOVÁ (203 Česká republika, garant), Bořivoj KLEJDUS (203 Česká republika) a Ladislav HAVEL (203 Česká republika)

Vydání

Chem. listy, Praha, Česká společnost chemická, 2004, 0009-2770

Další údaje

Jazyk

čeština

Typ výsledku

Článek v odborném periodiku

Obor

10405 Electrochemistry

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 0.348

Kód RIV

RIV/00216224:14310/04:00009640

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

metalothioneins; electrochemical analysis;HMDE; catalytic signals;prenatrium wave; peak H;Brdicka reaction
Změněno: 21. 5. 2004 20:46, prof. RNDr. Libuše Trnková, CSc.

Anotace

V originále

Metallothioneins (MTs) belong to a group of oligo- and polypeptides which play an important role in the metabolism of metals in animals, plants and microorganisms. The metabolic function of MTs consists not only in detoxication of an organism but also in the homeostasis of essential metals. This paper reports a novel approach to electroanalysis of MTs. The electrochemical determination of MTs is based on catalytic processes which proceed at very negative potentials on mercury electrodes (from -1.7 V to -1.9 V vs. Ag/AgCl/KCl). These processes accompanied by evolution of hydrogen from supporting electrolyte components, include the Heyrovsky presodium wave and/or Brdicka reaction. It was found that SH groups present in MTs are responsible for catalytic processes. The catalytic signal of a MT at nanomolar concentrations can be detected on mercury electrodes using potentiostatic electrochemical methods. The highest sensitivity in the determination of MTs was observed with a galvanostatic method such as derivative potentiometric stripping analysis (CPSA) which produces the peak H. The coupling of CPSA with the adsorptive transfer stripping technique (AdTS) allows the determination of MTs at a femtomole level in a low amount of sample (5 ěl). Our recent results obtained by AdTS + CPSA show that detection limits for particular MTs can be improved by adding [Co(NH3)6] Cl3 to the sample analyzed. This is probably due to the formation of a complex between [Co(NH3)6] Cl3 and MT. We think that the peak H can be used in physiological studies of metal metabolism.

Anglicky

Metallothioneins (MTs) belong to a group of oligo- and polypeptides which play an important role in the metabolism of metals in animals, plants and microorganisms. The metabolic function of MTs consists not only in detoxication of an organism but also in the homeostasis of essential metals. This paper reports a novel approach to electroanalysis of MTs. The electrochemical determination of MTs is based on catalytic processes which proceed at very negative potentials on mercury electrodes (from -1.7 V to -1.9 V vs. Ag/AgCl/KCl). These processes accompanied by evolution of hydrogen from supporting electrolyte components, include the Heyrovsky presodium wave and/or Brdicka reaction. It was found that SH groups present in MTs are responsible for catalytic processes. The catalytic signal of a MT at nanomolar concentrations can be detected on mercury electrodes using potentiostatic electrochemical methods. The highest sensitivity in the determination of MTs was observed with a galvanostatic method such as derivative potentiometric stripping analysis (CPSA) which produces the peak H. The coupling of CPSA with the adsorptive transfer stripping technique (AdTS) allows the determination of MTs at a femtomole level in a low amount of sample (5 ěl). Our recent results obtained by AdTS + CPSA show that detection limits for particular MTs can be improved by adding [Co(NH3)6] Cl3 to the sample analyzed. This is probably due to the formation of a complex between [Co(NH3)6] Cl3 and MT. We think that the peak H can be used in physiological studies of metal metabolism.

Návaznosti

GA203/02/0422, projekt VaV
Název: Nové směry v elektrochemii nukleových kyselin a jejich aplikace v chemii životního prostředí
Investor: Grantová agentura ČR, Nové směry v elektrochemii nukleových kyselin a jejich aplikace v chemii životního prostředí
IAA1163201, projekt VaV
Název: Využití adsorptivní přenosové a eliminační techniky pro elektrochemickou analýzu oligonukleotidů a nukleových kyselin
Investor: Akademie věd ČR, Využití adsorptivní přenosové a eliminační techniky pro elektrochemickou analýzu oligonukleotidů a nukleových kyselin