Model based leak correction of real-time RQ measurement for dynamic controlled atmosphere storage

Bessemans, Niels; Verboven, Pieter; Verlinden, Bert; Nicolaı̈, Bart

doi:10.1016/j.postharvbio.2017.09.011

Cited by 12 publications

(15 citation statements)

References 42 publications

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“…Conference pears were harvested on 24 th of August 2018 and stored at −1 °C. After three weeks of storage in regular air, the pears were transferred into an air-tight polypropylene fruit storage container (≤300 L) in which the atmosphere was controlled using a DCA protocol according to [25]. Carbon dioxide concentration was maintained at 0.7 kPa while oxygen concentration was allowed to vary between 3 and 0.2 kPa, according to measured RQ values in the DCA protocol.…”

Section: Methodsmentioning

confidence: 99%

A Broadband Mid-Infrared Trace Gas Sensor Using Supercontinuum Light Source: Applications for Real-Time Quality Control for Fruit Storage

Jahromi¹,

Pan²,

Khodabakhsh³

et al. 2019

Sensors

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We present a fully integrated and transportable multi-species trace gas sensor based on a mid-infrared (MIR) supercontinuum light source. The high brightness (surpassing synchrotron) and ultra-broad spectral bandwidth (2–4 μm) of this light source allows simultaneous detection of multiple broadband absorbing gas species. High sensitivity in the sub-ppmv level has been achieved by utilizing an astigmatic multipass cell. A grating-based spectrometer at a scanning rate of 20 Hz is developed employing a balanced detection scheme. A multi-component global fitting algorithm is implemented into a central LabVIEW program to perform real-time data analysis. The obtained concentration values are validated by the standard gas chromatography mass spectrometry (GC-MS) method. Field application of the sensor for quality control of stored fruits at a small scale is demonstrated, involving the detection of ethylene, ethanol, ethyl acetate, acetaldehyde, methanol, acetone, and water simultaneously. The sensor also shows promising potentials for other applications, such as environmental monitoring and biomedical research.

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Section: Methodsmentioning

confidence: 99%

A Broadband Mid-Infrared Trace Gas Sensor Using Supercontinuum Light Source: Applications for Real-Time Quality Control for Fruit Storage

Jahromi¹,

Pan²,

Khodabakhsh³

et al. 2019

Sensors

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“…In RQ-DCA storage, RQ measurements were observed that deviate more from 1.0 than could biochemically explained. An explanation for observed RQ-values greater than 1.3 was found in the leak of O2 gas into the storage room during RQ-measurement (Bessemans et al, 2018). However, in RQ-DCA storage, RQ values lower than 0.7 were observed, which remain inexplicable until now.…”

Section: Introductionmentioning

confidence: 96%

“…The principle of using RQ as a biological response to detect low O2 stress has been known for many years (Wollin et al, 1985;Wolfe et al, 1993), but had not been used commercially as gas leakage of the storage environment corrupts the measurements. This problem was solved by the development of a model-based leak correction measurement, allowing real-time correction of measured RQ-values for leakage of the storage environment (Bessemans et al, 2018) and, alternatively, by the enclosure of fruit in RQ measurement chambers within or connected to the CA room (Schaefer and Bishop, 2014;Brackmann, 2015) .…”

Section: Introductionmentioning

confidence: 99%

Apparent respiratory quotient observed in headspace of static respirometers underestimates cellular respiratory quotient of pear fruit

Bessemans

Verboven

Verlinden³

et al. 2020

Postharvest Biology and Technology

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A three-compartment non-equilibrium gas transport model of 'Conference' pear fruit under controlled atmosphere (CA) storage was developed. The model fruit tissue consists of cells, in which the concentrations of respiratory gasses can show gradients, and intercellular space, in which gasses are uniformly distributed. Non-equilibrium of gas concentrations in the cell compartment and intercellular space is assumed. A respiration model based on Michaelis-Menten respiration kinetics without inhibition of respiration by CO2 and incorporating down-regulation of the maximal O2 consumption rate in response to O2 was developed. Conversion of CO2 dissolved in the cell compartment to hydrogen carbonate at a constant pH of 5.0 was included. The model was validated based on experimental data of 'Conference' pear fruit during a complete depletion experiment starting from 3.58 mol m -3 O2 and 0.00 mol m -3 CO2. Model predictions match experimental observations well. Gas concentrations in the cell compartment were found to be in 2 equilibrium with the gas concentrations in the intercellular space. The model was used to calculate apparent respiration rates and RQ as if measured in the storage headspace. Apparent values were compared to actual values in the fruit cells and it was found that apparent respiration rates and RQ, calculated based on headspace measurements, underestimated the actual respiration rate and respiratory quotient in the fruit cells. Relative differences of 4 %, 41 % and 41 % were found for the apparent O2 consumption rate, CO2 production rate and RQ, respectively. This affects the design of commercial RQ based DCA systems.

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“…More recently, use of a dynamic, rather than a static, controlled atmosphere has gained attention. In dynamic controlled atmosphere (DCA) systems, the storage conditions are registered by monitoring the physiological response of fruits such as in a dynamic controlled atmosphere-respiratory quotient (DCA-RQ) system [ 13 , 14 , 15 , 16 , 17 ]. A limitation of a DCA-RQ system is leakage of the storage facility because a small leak from the storage room will lead to erroneous values of RQ [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…A limitation of a DCA-RQ system is leakage of the storage facility because a small leak from the storage room will lead to erroneous values of RQ [ 18 ]. Bessemans [ 13 ] introduced a new automatic DCA control system based on online real-time RQ measurements that took into account leakage in a predictive model. However, since the variability of the gas tightness of a commercial CA storage is not predictable, the mathematical model could be prone to errors.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Measurement of Fresh Produce Respiration Using a Modular Sensor-Based System

Keshri

Truppel

Herppich

et al. 2020

Sensors

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In situ, continuous and real-time monitoring of respiration (R) and respiratory quotient (RQ) are crucial for identifying the optimal conditions for the long-term storage of fresh produce. This study reports the application of a gas sensor (RMS88) and a modular respirometer for in situ real-time monitoring of gas concentrations and respiration rates of strawberries during storage in a lab-scale controlled atmosphere chamber (190 L) and of Pinova apples in a commercial storage facility (170 t). The RMS88 consisted of wireless O2 (0% to 25%) and CO2 sensors (0% to 0.5% and 0% to 5%). The modular respirometer (3.3 L for strawberries and 7.4 L for apples) consisted of a leak-proof arrangement with a water-containing base plate and a glass jar on top. Gas concentrations were continuously recorded by the RMS88 at regular intervals of 1 min for strawberries and 5 min for apples and, in real-time, transferred to a terminal program to calculate respiration rates ( R O 2 and R CO 2 ) and RQ. Respiration measurement was done in cycles of flushing and measurement period. A respiration measurement cycle with a measurement period of 2 h up to 3 h was shown to be useful for strawberries under air at 10 °C. The start of anaerobic respiration of strawberries due to low O2 concentration (1%) could be recorded in real-time. R O 2 and R CO 2 of Pinova apples were recorded every 5 min during storage and mean values of 1.6 and 2.7 mL kg−1 h−1, respectively, were obtained when controlled atmosphere (CA) conditions (2% O2, 1.3% CO2 and 2 °C) were established. The modular respirometer was found to be useful for in situ real-time monitoring of respiration rate during storage of fresh produce and offers great potential to be incorporated into RQ-based dynamic CA storage system.

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Model based leak correction of real-time RQ measurement for dynamic controlled atmosphere storage

Cited by 12 publications

References 42 publications

A Broadband Mid-Infrared Trace Gas Sensor Using Supercontinuum Light Source: Applications for Real-Time Quality Control for Fruit Storage

A Broadband Mid-Infrared Trace Gas Sensor Using Supercontinuum Light Source: Applications for Real-Time Quality Control for Fruit Storage

Apparent respiratory quotient observed in headspace of static respirometers underestimates cellular respiratory quotient of pear fruit

In-Situ Measurement of Fresh Produce Respiration Using a Modular Sensor-Based System

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