Effects of Packaging Liners on Cooling Rate and Quality Attributes of Table Grape (cv. Regal Seedless)

Ngcobo, Mduduzi E. K; Opara, Umezuruike Linus; Thiart, G. D.

doi:10.1002/pts.961

Cited by 39 publications

(25 citation statements)

References 21 publications

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“…A comparison of the effect of types of liners with Regal Seedless showed that unperforated liners in an RH of 100% maintain lower rachis browning as compared with those in perforated liners with an RH of about 92% (Ngcobo et al . ), but SO 2 injuries were higher in the closed liners. Interestingly, the liner with multiple micro‐perforations caused the lowest pressure drop in a wind tunnel, and its rachis score was better than that for liners with a high degree of perforation (Ngcobo et al .…”

Section: Packaging During Cold Storage and Shelf‐lifementioning

confidence: 84%

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Rachis browning in tablegrapes

Lichter

2016

Australian Journal of Grape and Wine Research

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Rachis browning is considered the second most important postharvest problem of tablegrapes. The primary problem, control of decay, was extensively studied in recent years, often with minor attention to rachis browning. To the consumer, a green rachis is an indication of freshness, and hence, a brown rachis can be a major cause of consumer rejection and eventually fruit waste. The significant advantage of the sulfur dioxide technology in its various forms of application is that it can prevent both decay and reduce rachis browning. Such an advantage is partly why alternative control measures, which may be significant for control of decay, did not develop further. Understanding rachis browning starts with a description of methods to measure it. Dehydration is considered the primary cause of browning, and therefore, packaging and other technologies which decrease dehydration are discussed. Controlled and modified atmosphere technologies may have opposing effects on rachis browning, making it important to be familiar with the wider picture. It is also important to realise the effect of various other treatments in which rachis browning was measured, because it can hint on what has, and has not, a potential to reduce it. The effect of plant-growth regulators is discussed with special emphasis on the potential role of ethylene in enhancing rachis browning and ethylene antagonists in reducing it. It is suggested that controlling rachis browning may require dedicated treatments based on physiological and molecular mechanism of browning in combination to control of decay.

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Section: Packaging During Cold Storage and Shelf‐lifementioning

confidence: 84%

“…Rachis dehydration is classified according to another five‐point index based on the degree of shrivelling of thin or thick rachises (Ngcobo et al . ), but application of this type of scale appears to require a good deal of training.…”

Section: Methods To Measure Rachis Browningmentioning

confidence: 99%

Rachis browning in tablegrapes

Lichter

2016

Australian Journal of Grape and Wine Research

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“…For example, 8 hours of RC for carnations was performed without packages or with open boxes . Additionally, proper packaging was also investigated for table grapes which were only suitable for air‐based precooling . In recent years, detailed characterization of airflow, heat transfer, and mass transfer during RC could be performed by experimental measurements .…”

Section: Introductionmentioning

confidence: 99%

“…10 Additionally, proper packaging was also investigated for table grapes which were only suitable for air-based precooling. 11 In recent years, detailed characterization of airflow, heat transfer, and mass transfer during RC could be performed by experimental measurements. 12 With the help of these experimental methods, simplified heat and mass transfer models by solving system of linear equations were developed to predict the performances of RC.…”

Section: Introductionmentioning

confidence: 99%

Experimental performance comparison and trade‐off among air‐based precooling methods for postharvest apples by comprehensive multiscale thermodynamic analyses

Wang

Zhang

2019

Int J Energy Res

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Summary Air‐based precooling methods including room cooling and forced‐air cooling were traditionally used for postharvest horticultural products. In this study, disturbed‐air cooling with different layouts was proposed for the trade‐off between room cooling with long cooling time and forced‐air cooling with high energy consumption. Lab‐scale experiments with 30 bins of postharvest apples were conducted using the aforementioned methods to measure the temperature history. Multiscale thermodynamic analyses from energy, entropy, exergy, and entransy perspectives were then performed. The time evolution of transient quantities and overall comparison of the trade‐off performances were further discussed. The ventilation power and transformed heat became more significant respectively for the total energy consumption and heat load during the precooling processes. The rates of entropy generation, exergy destruction, and entransy dissipation reduced in consistent with the tendency of heat rejection from all bins. The major part of these losses was resulted by the ventilation for convective heat transfer between cold air and apples and became more significant during later stage of precooling processes. The middle‐parallel disturbed‐air cooling achieved the best trade‐off between the lowest energy consumption for room cooling and the lowest maximum seven‐eighths cooling time for forced‐air cooling by respectively reaching 81.68% and 28.82% of the optimization potential. The best trade‐off between the lowest thermodynamic loss for room cooling and the lowest heat transfer ability loss for forced‐air cooling was also achieved by this method with around 55% to 62% optimization of the coefficients of performance, around 83% optimization of the entropy generation ratio, around 58% to 62% optimization of the exergy destruction ratio, and around 36% optimization of the entransy dissipation ratio.

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“…However, table grapes deteriorate easily by pathogen infection due to their characteristics of being soft and having a high moisture content, which lead to the quality and safety issues of table grapes that have received worldwide attention [1,2]. Cold chain logistics is an effective measure to ensure that table grapes are stored in a low temperature environment all of the time by using artificial refrigeration technology when they are in various links, such as processing, storage, transportation, sale, etc., and to reduce the quality losses of table grapes [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Quality Property of Table Grapes in Cold Chain Logistics-Integrated WSN and AOW

et al. 2015

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Table grapes are very popular for their high nutritional and therapeutic value. The objective of this work was to study the effect of table grapes' quality property in cold chain logistics for improving the transparency and traceability of table grapes' cold chain logistics and ensuring the table grapes' quality and safety. Temperature and relative humidity are monitored by adopting the wireless sensor network (WSN) as the fundamental network infrastructure and adaptive optimal weighted data fusion (AOW) for the adaptive data fusion. The cold chain process, firmness quality and adaptive data fusion of temperature and relative humidity were evaluated in an actual cold chain logistics. The results indicate that the WSN and AOW methods could effectively reflect the real-time temperature and relative humidity information and quality property, improve the transparency and traceability in the cold chain and ensure the preservation of the quality and safety of table grapes. The AOW performance analysis shows that the AOW, whose mean absolute error and mean relative error of the temperature data are 0.06 °C and 8.61% and relative humidity data are 0.12% and 0.23%, respectively, could fuse the sensor data accurately, efficiently and adaptively and meet the actual application requirements. OPEN ACCESSAppl. Sci. 2015, 5 748

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Effects of Packaging Liners on Cooling Rate and Quality Attributes of Table Grape (cv. Regal Seedless)

Cited by 39 publications

References 21 publications

Rachis browning in tablegrapes

Rachis browning in tablegrapes

Experimental performance comparison and trade‐off among air‐based precooling methods for postharvest apples by comprehensive multiscale thermodynamic analyses

Effect of the Quality Property of Table Grapes in Cold Chain Logistics-Integrated WSN and AOW

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