Articles
Validation and evaluation of TDLAS sensor for non-destructive intercellular oxygen measurement in pome fruits
Article number
1386_43
Pages
315 – 322
Language
English
Abstract
During controlled atmosphere (CA) storage, an optimal O2 concentration is needed to maintain quality and prolong shelf life of fruit.
As the demand for O2 depends on many factors including fruit type, maturity and size, setting an optimal O2 in CA is still challenging.
The aim of this work was to validate and evaluate a non-destructive tunable diode laser absorption spectroscopy (TDLAS) sensor for fruit intercellular O2 measurements to provide demand specific O2 supply under CA conditions.
A multilayer model system consisting of two liquid phantom layers with an Intralipid® scattering solution (μs: 100 cm‑1) and a middle O2 layer with 1, 20, 50 and 100% O2 was used to validate sensor ability to measure the O2 in scattering media.
The TDLAS signal intensity was proportional with the O2 concentration.
The sensor then was used to study the difference in O2 utilization between Golden Delicious and Kanzi apples and Conference pears.
The TDLAS signal from Golden Delicious was twice that for the Kanzi apples and nearly 5 times higher than that of the Conference pears.
The calculated relative O2 changes during respiration for Golden Delicious and Conference were also different.
It was hypothesized that these differences may be attributed to differences in fruit porosity.
This non-destructive TDLAS-based oxygen sensor has potential to reduce hypoxia related storage disorders and preserve the quality of fruits during CA storage.
As the demand for O2 depends on many factors including fruit type, maturity and size, setting an optimal O2 in CA is still challenging.
The aim of this work was to validate and evaluate a non-destructive tunable diode laser absorption spectroscopy (TDLAS) sensor for fruit intercellular O2 measurements to provide demand specific O2 supply under CA conditions.
A multilayer model system consisting of two liquid phantom layers with an Intralipid® scattering solution (μs: 100 cm‑1) and a middle O2 layer with 1, 20, 50 and 100% O2 was used to validate sensor ability to measure the O2 in scattering media.
The TDLAS signal intensity was proportional with the O2 concentration.
The sensor then was used to study the difference in O2 utilization between Golden Delicious and Kanzi apples and Conference pears.
The TDLAS signal from Golden Delicious was twice that for the Kanzi apples and nearly 5 times higher than that of the Conference pears.
The calculated relative O2 changes during respiration for Golden Delicious and Conference were also different.
It was hypothesized that these differences may be attributed to differences in fruit porosity.
This non-destructive TDLAS-based oxygen sensor has potential to reduce hypoxia related storage disorders and preserve the quality of fruits during CA storage.
Authors
M. Joseph, R. Van Beers, B.M. Nicolaï, W. Saeys
Keywords
controlled atmosphere storage, pome fruits, hypoxia, tunable diode laser absorption spectroscopy, liquid phantom model
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