Development of a Potable Amperometric Acid Sensor for Measuring the Titratable Acidity of Fruit Juices

Kotani, Akio; Kikuchi, Ikumi; Nagayoshi, T.; Inoue, Masakiyo; Kusu, Fumiyo

doi:10.2116/bunsekikagaku.57.199

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…The results by the present sensor were in good agreement with those by titration (r = 0.989): y = 0.973x − 0.002, where y is the titratable acidity obtained by the present sensor, and x is that by the potentiometric titration. 70 Moreover, the sensor was applied to determine titratable acidity in grapefruit as shown in Table I. From these results, the present sensor was shown to be practical and useful for determining acid values in both fruits and their juices.…”

Section: Real Sample Analysis For the Application Of The Portable Sensormentioning

confidence: 81%

“…After a series of procedures for determining titratable acidity by the sensor, a value of 0.72 was displayed as the titratable acidity of orange juice (#1) on the monitor. 70 The repeatability of the titratable acidity obtained by repeated measurements was 1.0% RSD (n = 6). To compare the titratable acidity by potentiometric titration, 5 mL of the orange juice sample (#1) were neutralized with 0.100 mol/L NaOH up to pH 8.2.…”

Section: Real Sample Analysis For the Application Of The Portable Sensormentioning

confidence: 87%

“…In previous studies, the present sensor had been applied to determine titratable acidities in fruit juice, Japanese sake, and shochu. 49,69,70 To perform the abovementioned sample analyses, the optimization of an electrolyte cocktail and measurement conditions were determined as follows: (1) DBBQ and supporting electrolyte (NaCl) are easily dissolved, (2) DBBQ, NaCl, and components including acids in samples are not precipitated during voltammetric measurement, and (3) the above-mentioned components and electrolyte products are not adsorbed on the surface of the electrode or electrochemical cell. For the analysis of fruit juice, Japanese sake, and shochu, we have provided the electrolyte cocktail and measurement conditions in Table S3.…”

Section: Construction Of a Voltammetric Sensormentioning

confidence: 99%

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Review—A Portable Voltammetric Sensor for Determining Titratable Acidity in Foods and Beverages

Kotani

Kusu

Takamura

et al. 2019

J. Electrochem. Soc.

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When 3,5-di-t-butyl-1,2-benzoquinone (DBBQ) is electrochemically reduced in an unbuffered solution, the addition of small amounts of acid to the solution is found to give rise to a new peak (termed the prepeak) at a more positive potential than the original reduction potential of DBBQ. In addition, the prepeak current heights of DBBQ are proportional to the added acid concentration. From these findings, we utilized the voltammetric behaviors of DBBQ to develop an analytical method for the determination of titratable acidity in food and beverage samples. Moreover, a portable voltammetric sensor (weight, 100 g; power, two AAA batteries), that implements this analytical method, was developed in order to provide an on-site analytical device. To show the applicability of this portable sensor, the determination of titratable acidity in fruit juice, wine, Japanese sake, and shochu was performed. The results obtained by the portable sensor showed a good correlation with those from official potentiometric titration using 0.1 mol/L NaOH. In conclusion, the present sensor required a reduced sample volume and measurement time for an assay compared with conventional potentiometric titration, consequently showing potential for quality assessment in a wide range of food and beverage analyses.

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Section: Real Sample Analysis For the Application Of The Portable Sensormentioning

confidence: 81%

Section: Real Sample Analysis For the Application Of The Portable Sensormentioning

confidence: 87%

Section: Construction Of a Voltammetric Sensormentioning

confidence: 99%

See 1 more Smart Citation

Review—A Portable Voltammetric Sensor for Determining Titratable Acidity in Foods and Beverages

Kotani

Kusu

Takamura

et al. 2019

J. Electrochem. Soc.

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“…Considering previous studies [26,36,37], the present method could also be applied to develop a portable sensor for determining amino acidity.…”

Section: Linear Relationship Between I H Caused By Surplus Hcl and Comentioning

confidence: 99%

“…The values of the i H for d-alanine are proportional to the concentrations, and calibration curves for d-and l-alanines are almost the same as shown in Table 1. By the measurement of i H , because acids in foods and beverages such as fruit juices, wine, coffee, fats, and oils can be determined without an interference by sugar, protein (up to about 0.1 g/L), electroactive substances such as ascorbic acid, polyphenols, and tocopherols, and inorganic compounds [23,26,27,[36][37][38], the present method would provide basic information for the development of an electrochemical sensor to determine an amino acidity in Japanese sake. Thus, the present method, which detects amino acids without distinguishing between d-and l-forms, is a useful strategy for determining amino acidity in fermented foods and beverages.…”

Section: Linear Relationship Between I H Caused By Surplus Hcl and Comentioning

confidence: 99%

Voltammetric Determination of Amino Acids Based on the Measurement of Reduction Prepeak of Quinone Caused by Surplus Acid after Neutralization

et al. 2018

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In the voltammetric reduction of quinone, such as 3,5‐di‐tert‐butyl‐1,2‐benzoquinone (DBBQ), in the presence of HCl, a reduction prepeak of DBBQ caused by HCl can be observed on a voltammogram. Here, we have shown that the prepeak height of DBBQ is linearly decreased with increasing concentrations of amino acid in an electrolyte solution when this voltammetry is performed after neutralization between amino acids and excess HCl. This finding is based on a concept of acid‐base back titration of amino acids with excess HCl where surplus HCl gives a reduction prepeak of DBBQ. In this study, the reduction behaviors of DBBQ in the presence of amino acids and HCl have been provided to develop a novel electroanalytical method for the determining of amino acids. Electrochemical detection of 20 kinds of α‐amino acids, including less electroactive ones, has been achieved using a bare plastic formed carbon working electrode. Moreover, a flow injection analysis with electrochemical detection system using a glassy carbon working electrode is developed based on the present detection principle, and it has been applied to the determination of glutamine in an L‐glutamine granulated powder.

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Development and Application of Electroanalytical Methods in Biomedical Fields

Kusu

2015

YAKUGAKU ZASSHI

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To summarize our electroanalytical research in the biomedicalˆeld over the past 43 years, this review describes studies on specular re‰ection measurement, redox potential determination, amperometric acid sensing, HPLC with electrochemical detection, and potential oscillation across a liquid membrane. The specular re‰ection method was used for clarifying the adsorption of neurotransmitters and their related drugs onto a gold electrode and the interaction between dental alloys and compound iodine glycerin. A voltammetric screening test using a redox potential for the antioxidative eŠect of ‰avonoids was proposed. Amperometric acid sensing based on the measurement of the reduction prepeak current of 2-methyl-1,4-naphthoquinone (VK 3 ) or 3,5-di-tert-buty1-1,2-benzoquinone (DBBQ) was applied to determine acid values of fats and oils, titrable acidity of coŠee, and enzyme activity of lipase, free fatty acids (FFAs) in serum, short-chain fatty acids in feces, etc. The electrode reactions of phenothiazines, catechins, and cholesterol were applied to biomedical analysis using HPLC with electrochemical detection. A three-channel electrochemical detection system was utilized for the sensitive determination of redox compounds in Chinese herbal medicines. The behavior of barbituric acid derivatives was examined based on potential oscillation measurements.

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Development of a Potable Amperometric Acid Sensor for Measuring the Titratable Acidity of Fruit Juices

Cited by 4 publications

References 6 publications

Review—A Portable Voltammetric Sensor for Determining Titratable Acidity in Foods and Beverages

Review—A Portable Voltammetric Sensor for Determining Titratable Acidity in Foods and Beverages

Voltammetric Determination of Amino Acids Based on the Measurement of Reduction Prepeak of Quinone Caused by Surplus Acid after Neutralization

Development and Application of Electroanalytical Methods in Biomedical Fields

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