Safranine O Modified Pencil Graphite Electrode and Its Application for Determination of Fruit Acidity

Abstract

Abstract: A safranine O (SO) polymer film was formed by cyclic voltammetry on the surface of a pretreated pencil electrode (PGE) in SO-containing phosphate buffered saline (PBS). The effects of buffer pH and potential scan range on the modification process were investigated. The polymer film formed in an acidic solution (pH 6.01) and a potential scan range between－1.0 V and 0.0 V (vs SCE) showed high electrochemical activity and good stability in blank PBS solutions, and a good linearity between the voltammetric peak potential and the buffer pH was obtained in the pH range of 1.5－7.5. This modified electrode could be used for determining the acidity of oranges, tomatoes and juice with satisfying results.

Key words: safranine O, pencil graphite, fruit, acidity determination

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Safranine O Modified Pencil Graphite Electrode and Its Application for Determination of Fruit Acidity

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