Electroanalysis with Carbon Paste–Based Electrodes, Sensors, and Detectors - Electroanalysis with Carbon Paste Electrodes - page 420

TABLE 8.25 (continued)
Analysis of Biologically Important Compounds at Carbon Paste-Based Electrodes: Vitamins

Analyte Modiier Carbon Paste Techniques Comments Ref(s)

Ascorbic.acid Cu(II)-tetrasulfo.PC.

encapsulated.in.
n -propylpyridinium.
silsesquioxane.polymer.
on SiO 2 /Al 2 O 3

CV Catalytic.ox.;.pH.5-8;.s:.tablets [3152]

Ascorbic.acid Poly(4-vinylpyridine)/

hexacyanoferrate(II)

G/Nj CV Catalytic.ox.;.glycine.buffer.0.5.M,.pH.3.2 [1742]

Ascorbic.acid
Dopamine

Polypyrrole.(electropolym.)/
hexacyanoferrate

CV,.DPV,.LSV Simultaneous.det.;.PBS.0.1.M.+.KCl.0.05.M,.pH.6;.

LOD.33.8.μM

[1799,.
1802]

Ascorbic.acid Hexacyanoferrate(II).on.silica.

gel/propylpyridine

G/mo CV Catalytic.ox..via.hexacyanoferrate(III);.NaCl.0.7.M [1820]

Ascorbic.acid Hexacyanoferrate(II).on.

hydrotalcite.or.
hexacyanoferrate.(III).on.
trioctylamine

G/po.or.Nj.or.vaseline.
or TOA

CV.(i),.CA.(ii).(0.2.
V.vs..SCE)

Catalytic.oxidation;.(ii).oc.reaction.of.AA.with.
Fe(III).with.ensuing.CA;.PBS.0.1.M,.pH.7.4;.LOD.
0.2.mM.(i).or.0.1.mM.(ii);.s:.tea.bag,.juice

[1094]

Ascorbic.acid
Dopamine

Sn(IV)-hexacyano.ferrate.(II).+.
CTAB

G/po CV Electrocatalytic.ox..enhanced.by.CTAB;.PBS.0.5.M,.

pH.7;.s:.injection.solution

[1043]

Ascorbic.acid
Dopamine

Th(IV)-hexacyano.ferrate G/p CV,.CA.(0.8/0.V.vs..

SSE)

PBS.0.1.M,.pH.3 [1044]

Ascorbic.acid
Tryptophan
Uric.acid

Fe(III).on.zeolite G/mo CV,.DPV;. E acc .−0.3.

V.vs..SSE,. t ACC .30.s

PBS.0.15.M,.pH.3.5;.LOD.0.21.μM;.s:.serum [1122]

Ascorbic.acid Fe(III).on.zeolite.Y G/Nj SWV Catalytic.ox.;.PBS.0.1.M,.pH.5.4;.s:.orange.

and lemon.juice

[1110,.
3153]

Ascorbic.acid Fe(III).on.humic.acid CV,.A.(0.87.V.vs..

SCE)

Catalytic.ox.;.PBS.0.5.M.or.ABS.0.5.M.+.KCl.
0.5.M,.pH.5.4;.s:.orange.juice

[1704]

Ascorbic.acid Fe(II)-pentacyano.nitrosyl.

ferrate.ilm

catalyt..ox.;.KNO 3 .0.5.M;.LOD.4.μM [3154]