Development of an impedance measurement system for the detection of decay of apples

Euring, Frank; Ruß, Winfried; Wilke, W; Grupa, Uwe

doi:10.1016/j.profoo.2011.09.177

Cited by 16 publications

(9 citation statements)

References 11 publications

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“…The a-dispersion (100 mHz -1 kHz) is due to surface admittance and depends principally on the external membrane surface and apoplastic structures (cell walls), while b-dispersion (1 kHz -1 MHz) is mainly associated with the internal membrane and intracellular structures. Results of earlier studies also confirmed our findings that especially the upper part of the a-dispersion and the lower part of the b-dispersion region (0.5-10 kHz) is suitable for the complex, extra-and intracellular electrical investigation of plant tissues and organs (Euring et al, 2011).…”

Section: Resultssupporting

confidence: 90%

Role of phase angle measurement in electrical impedance spectroscopy

Cseresnyés¹,

Rajkai²,

Vozáry³

2013

International Agrophysics

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A b s t r a c t. Importance of phase angle measurement during the application of electrical impedance spectroscopy was studied by executing pot experiments with maize. Electrical impedance, phase angle (strength of capacitive character), and dissipation factor in the plant-soil system were scanned between 100 and 10 000 Hz current frequency. The frequency-dependent change in the phase angle could be described by optimum curves culminating within 920-3 650 Hz. Since the rate of energy dissipation is independent of root extent, the higher phase angle and lower energy dissipation were associated with the higher coefficient of determination achieved for the root electrical impedance -root system size (root dry mass and root surface area) regressions. The characteristic frequency selected on the basis of phase angle spectra provided a higher significance level at statistical comparison of plant groups subjected to stress conditions influencing root development. Due to the physicochemical changes observable in aging root tissue, the apex of phase angle spectra, thus the characteristic frequency, shifted continuously toward the higher frequencies over time. Consequently, the regularly repeated phase angle measurement is advisable in time-course studies for effective application of the electrical impedance method, and the systematic operation at the same frequency without determination of phase angle spectra should be avoided.K e y w o r d s: dissipation factor, root capacitance, electrical impedance spectroscopy, phase angle, root surface area INTRODUCTIONDestructive root investigation methods, such as soil cores, in-growth cores, or monoliths are unsuitable for continuous monitoring of root development or activity in response to changing environmental conditions. The applicability of the non-destructive ground penetrating radar, radioactive tracers, MRI or X-ray imaging techniques is also strongly limited in many cases: providing little resolution of root structure (detect clearly coarse roots only), these methods are not adapted for quantification of root surface area and examination of many plant phenomena related to root development (Cao et al., 2010;Èermák et al., 2006). Conversely, electrical impedance (EI) and electrical capacitance (EC) measurements in a plant-soil system offer good opportunities of rapid in situ investigation of the root system size and root activity without any intrusion into plant life function. By fixing an electrode at the plant stem and embedding the other one in the soil and connecting them by an LCR-instrument, the measured root EI and EC are directly correlated with root mass, root length, or root surface area (Chloupek, 1972;Ozier-Lafontaine and Bajazet, 2005;Rajkai et al., 2002). EI and EC methods have been used for investigation of detached plant tissues and organs subjected to various stress conditions (cold acclimation, freeze-thaw injury, drought, nutrient deficiency, or pathogen infection) as well as for studying intact root systems of plants cultivated in soil or grown in hydro...

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Section: Resultssupporting

confidence: 90%

Role of phase angle measurement in electrical impedance spectroscopy

Cseresnyés¹,

Rajkai²,

Vozáry³

2013

International Agrophysics

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“…, Euring et al. ), potato and carrot (Zhang and Willison , , Angersbach et al. ), and eggplant (Wu et al.…”

Section: Discussionmentioning

confidence: 99%

Electrical impedance of Shiraz berries correlates with decreasing cell vitality during ripening

Caravia

Collins

Tyerman

2015

Australian Journal of Grape and Wine Research

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Background and Aims: Cell death in the mesocarp of Shiraz berries has been correlated with berry mass loss that occurs late in ripening and can be linked to berry composition. The current techniques to assess the level of berry cell disruption are time-consuming and can give only relative measures. Here we test if electrical impedance of the berry, which is a function of the state of cells within, can be used to detect the loss of cell vitality. Methods and Results: Shiraz berries (774 berries) from two locations (one of them over two seasons) from veraison to harvest were studied. Electrical impedance spectroscopy was performed between 100 Hz and 1 or 2 MHz of alternating current across the berry, while for each berry proportion living tissue was estimated with fluorescein diacetate. The results indicated that, from veraison to the onset of cell death, berry impedance follows the accumulation of TSS. Thereafter, impedance decreases proportionally to the extent of berry cell death. Conclusions: Changes in cell vitality of the Shiraz grape berry can be objectively determined through impedance spectroscopy. The measurements also indicate that cell membranes, although becoming leaky, may still remain intact. Significance of the Study: Impedance spectroscopy as applied to the grape berry has demonstrated a promising application for measuring berry composition.

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“…The use of MI has been investigated recently in food technology, having the great advantage that electrodes are not needed for its application (Schivazappa et al, 2017). There are several studies in which the spectra of agricultural products have been analyzed using multi-frequency MI (Barai et al, 2012) and single-frequency MI (Euring et al, 2011). Regarding hams, Schivazappa et al (2017) obtained a higher signal in salted hams than in fresh ones, and they developed a model for salt prediction in which the RMSEC was 0.18%.…”

Section: Other Emerging Technologiesmentioning

confidence: 99%

Application of non-invasive technologies in dry-cured ham: An overview

Pérez-Santaescolástica

Fraeye

Barba

et al. 2019

Trends in Food Science & Technology

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Background: Dry-cured ham is one of the most valued food products by Mediterranean consumers. In this sense, the appropriate development of its different production stages is essential to ensure the quality requirements. For this reason, non-invasive technologies have gained popularity and have been reported as useful not only to ensure the food safety of different products, but also to monitor fundamental stages in the production process, such as the salting stage, to analyze the content of different compounds without sample losses, and to correct possible defects in the final product. Scope and approach: This work has been focused on summarizing the studies that describe and have successfully applied these techniques, as well as on mentioning other technologies with potential use in dry-cured ham manufacture which have not been studied enough. Finally, the potential next steps to improve and optimize the process, as well as the suitability of creating new products with added value based on the new quality standards, have also been evaluated. Key findings and conclusions: Innovative non-invasive technologies such as high pressure (HP), ultrasound (US), pulsed electric fields (PEF), microwaves, irradiation, etc. can be used as promising tools to effectively control salting and curing stages as well as for checking defects of the final product and/or ensuring food safety. HP and US are useful tools for the determination of salt and fat content, and for monitoring the salting process. Moreover, HP enhances salty taste perception, which makes it a useful tool to reduce salt addition. Both, HP and US, can correct texture defects. In addition, NIRS allows predicting the state of the meat to remove those pieces that could result in defective products. Moreover, RAMAN or MRI are able to detect anomalous textures at the end of the process. Microwaves could be useful for the online estimation of salt, water and fat contents easily with portable equipment. Finally, data mining, that allows to make predictions based on an immense data file, is the most promising discovery in recent years for detecting defects or classifying products according to sensory attributes.

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Development of an impedance measurement system for the detection of decay of apples

Cited by 16 publications

References 11 publications

Role of phase angle measurement in electrical impedance spectroscopy

Role of phase angle measurement in electrical impedance spectroscopy

Electrical impedance of Shiraz berries correlates with decreasing cell vitality during ripening

Application of non-invasive technologies in dry-cured ham: An overview

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