Sensor and Methodology for Dielectric Analysis of Vegetal Oils Submitted to Thermal Stress

Stevan, Sérgio Luiz; Paiter, Leandro; Galvão, José Ricardo; Roque, Daniely Vieira; Chaves, Enaura Helena Brandão

doi:10.3390/s151026457

Cited by 28 publications

(16 citation statements)

References 32 publications

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“…A capacitive sensor has been used by Stevan Jr. et al (2015) to monitor the degradation of vegetable oils subjected to thermal stress. When used for frying with repeated thermal cycles at high temperatures, oils are subject to alterations in their structure with degradation of organoleptic properties and potential danger for consumers' health.…”

Section: Vegetable Oilsmentioning

confidence: 99%

Electrical impedance spectroscopy (EIS) for biological analysis and food characterization: a review

Grossi

Riccò

2017

J. Sens. Sens. Syst.

271

144

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Abstract. Electrical impedance spectroscopy (EIS), in which a sinusoidal test voltage or current is applied to the sample under test to measure its impedance over a suitable frequency range, is a powerful technique to investigate the electrical properties of a large variety of materials. In practice, the measured impedance spectra, usually fitted with an equivalent electrical model, represent an electrical fingerprint of the sample providing an insight into its properties and behavior. EIS is used in a broad range of applications as a quick and easily automated technique to characterize solid, liquid, semiliquid, organic as well as inorganic materials. This paper presents an updated review of EIS main implementations and applications.

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Section: Vegetable Oilsmentioning

confidence: 99%

Electrical impedance spectroscopy (EIS) for biological analysis and food characterization: a review

Grossi

Riccò

2017

J. Sens. Sens. Syst.

271

144

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“…It depends on some factors, such as the electrode geometry, which is inversely proportional to the distance between electrodes, proportional to the common area of electrodes and the dielectric permittivity of the dielectric present between them, and as a function of these characteristics, it can be either analytically or numerically calculated [26]. …”

Section: Methodsmentioning

confidence: 99%

Mobile Helical Capacitive Sensor for the Dynamic Identification of Obstructions in the Distribution of Solid Mineral Fertilizers

Dalacort

Stevan

2018

Sensors

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Modern agriculture uses techniques and technologies that have provided farmers with increased yield and a possible reduction in costs. Optimizing the use of inputs by applying exact and accurate doses, which match the real needs of the soil, in addition to supplying the necessary nutrients for the correct development of the crops, enables a reduction in costs and environmental impacts caused by the incorrect use of products such as fertilizers and pesticides. With this background, this paper presents a study on the development of a capacitive sensor to identify the absence, presence or variations in the distribution of solid mineral fertilizers. To evaluate this sensor, eight different formulations were tested in distribution analysis with an overflow dosing mechanism, both statically and dynamically, with 2% maximum moisture variation between all samples. The identification of an absence or presence of fertilizers was successful in 100% of the experiments. Tests to identify variations in the fertilizer distribution were carried out through simulated obstruction. The sensor identified a reduction in the fertilizer flow in all experiments, obtaining numeric variations above 55%. In the fertilizer formulation identification test, only the formulations 02-28-20 and 06-21-12 in experiments carried out with the overflow dosing mechanism did not differ statistically one from another, while all other formulations presented a statistically significant difference in the ANOVA analysis and the Tukey test at 5% significance.

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“…Dielectric properties relate to the water activity (a w ) that constitutes a representative index for the water affinity on food material. ere are some reports on the application of the dielectric analysis mentioned above for the purpose of the investigation and monitoring of the quality of the food products [62,63].…”

Section: Experimental Approach: Observations Of Water Molecules As a mentioning

confidence: 99%

Functional Hydration Behavior: Interrelation between Hydration and Molecular Properties at Lipid Membrane Interfaces

Watanabe

Suga

Umakoshi

2019

Journal of Chemistry

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Water is an abundant commodity and has various important functions. It stabilizes the structure of biological macromolecules, controls biochemical activities, and regulates interfacial/intermolecular interactions. Common aspects of interfacial water can be obtained by overviewing fundamental functions and properties at different temporal and spatial scales. It is important to understand the hydrogen bonding and structural properties of water and to evaluate the individual molecular species having different hydration properties. Water molecules form hydrogen bonds with biomolecules and contribute to the adjustment of their properties, such as surface charge, hydrophilicity, and structural flexibility. In this review, the fundamental properties of water molecules and the methods used for the analyses of water dynamics are summarized. In particular, the interrelation between the hydration properties, determined by molecules, and the properties of molecules, determined by their hydration properties, are discussed using the lipid membrane as an example. Accordingly, interesting water functions are introduced that provide beneficial information in the fields of biochemistry, medicine, and food chemistry.

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Sensor and Methodology for Dielectric Analysis of Vegetal Oils Submitted to Thermal Stress

Cited by 28 publications

References 32 publications

Electrical impedance spectroscopy (EIS) for biological analysis and food characterization: a review

Electrical impedance spectroscopy (EIS) for biological analysis and food characterization: a review

Mobile Helical Capacitive Sensor for the Dynamic Identification of Obstructions in the Distribution of Solid Mineral Fertilizers

Functional Hydration Behavior: Interrelation between Hydration and Molecular Properties at Lipid Membrane Interfaces

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