Amperometric Sensors Based on Synthetic Hydrotalcites and Their Application for Ethanol Detection in Beer

Abstract

The electrochemical and electrocatalytic behavior of electrodes modified with a Co/Al-NO 3 hydrotalcite (HT) has been investigated and compared with that displayed by Ni/Al-NO 3 HT modified electrodes. Mono and polyhydric compounds have been tested to study electrocatalysis. At Co/Al-NO 3 HT modified electrodes only polyhydric compounds give e current signal, whereas at Ni/Al-NO 3 HT modified electrodes, both alcohols and polyhydric compounds can be detected. The different electrocatalytic behavior of Ni and Co based electrodes has been exploited to develop an analytic method for the selective determination of alcohols in the presence of polyhydric compounds. Samples of beer found on the Italian market have been analyzed to verify the validity of the proposed method in the detection of the ethanol content. The procedure does require neither a preliminar treatment nor a separation of the sample, but only the recording of two cyclic voltammogramms, one with the Co/Al-NO 3 and one with the Ni/Al-NO 3 HT modified electrode. The results obtained have been promising.

LDHs as Electrode Materials for Electrochemical Detection and Energy Storage: Supercapacitor, Battery and (Bio)-Sensor

“…Indeed, the redox couple Ni 2+ /Ni 3+/4+ inside the lattice structure has an electrocatalytic activity with respect to the oxidation of mono or polyhydric alcohols and aliphatic and aromatic amines [33]. Samples of beer have been analysed to verify the validity of the proposed analytical method for the detection of their ethanol content [34]. Afterwards, NiAl-sensors were optimized for the determination of ethanol, glycerol and glucose ( Table 1).…”

Mass transport in thin films of [Fe(CN)6]4− exchanged Ni–Al layered double hydroxide monitored with an electrochemical quartz crystal microbalance

“…The electrochemical responses of [Fe(CN) 6 [8], polyoxometalate ions [9,10], manganese porphyrins [11], and several organometallic [12] and organic anions [13][14][15] adsorbed in LDH-modified electrodes have been reported. LDH-modified electrodes have been investigated for use as electrochemical sensors [16,17], for electrocatalysis [18], as cathodes for rechargeable batteries [19], as electrochemical capacitors [20,21], etc.…”

A Cheap Amperometric and Optical Sensor for Glucose Determination

“…Our research group possesses a wide experience in the use of electrodes modified with Ni or Co based layered double hydroxides, which have been used for the amperometric determination of oxidizable substrates in basic solution, exploiting the electrocatalytic activity of nickel or cobalt centers [11,12].…”

“…Hydrotalcites (HTs), also known as hydrotalcite like compounds, are employed in the construction of biosensors [8,9], amperometric [10,11] and potentiometric sensors [12], due to their attractive features such as high water content, high mobility of analytes and reaction products, non-toxicity and high chemical and hydrolytic stability.…”

“…HTs containing a transition metal like Co(II), Ni(II) or Mn(III), which can be involved in a reversible redox reaction in the proper potential range, have been proposed as electrode coating materials due to their properties of charge transport and of redox catalysts [11], especially in alkaline solution.…”