▎ 摘　　要

Nineteen amperometric dot microsensors based on graphite (G) modified with iron(III) porphyrin (Fe(III)P), tetraphenylporphine (TPP), tetraphenyl-porphine cobalt(II) (Co(II)TPP), iron(II) phthalocyanine (Fe(II)Pc), iron(III) phthalocyanine (Fe(III)Pc), tetraamino cobalt(II) phthalocyanine (CoTAPc), tetraamino zinc(II) phthalocyanine (ZnTAPc), tetramino nickel(II) phthalocyanine (NiTAPc), tetraamino manganese(II) phthalocyanine (MnTAPc), tetranitro cobalt(II) phthalocyanine (CoTNPc), tetranitro zinc(II) phthalocyanine (ZnTNPc), tetranitro nickel(II) phthalocyanine (NiTNPc), tetranitro manganese(II) phthalocyanine (MnTNPc) and graphene (GR) modified with Fe(III)P, TPP, Co(II)TPP, Fe(II)Pc, Fe(III)Pc, Co(II)Pc were tested for their ability to detect folic acid (FA) from orange juice. Cyclic voltammetry (CV) was used to determine the optimum working conditions. The optimum working pH was 7.0 (phosphate buffer), with a 0.1 mol L-1 KCl supporting electrolyte. Folic acid was recovered reliably from orange juice samples in percentages higher than 96.00.