Effects of maturity on chlorophyll-related absorption in nectarines, measured by non-destructive time-resolved reflectance spectroscopy

Tijskens, L.M.M.; Zerbini, P. Eccher; Vanoli, M.; Jacob, S.; Grassi, M.; Cubeddu, Rinaldo; Spinelli, Lorenzo; Torricelli, Alessandro

doi:10.1504/ijpti.2006.011660

Cited by 25 publications

(14 citation statements)

References 17 publications

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“…The absorption due to chlorophyll would have been less as most of it would be degraded and reduced to minimum towards the end of storage. The present result is contrary to the results of Tijskens et al (2006), who reported a decrease in the µ a value (at 670 nm) of nectarines as the storage period progressed. Compared to nectarines, plums are generally smaller in size.…”

Section: Resultscontrasting

confidence: 99%

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Optical Absorption and Scattering Phenomena in 'Jubileum' Plums in Relation to Their Colour Properties

Jacob¹,

Vangdal²,

Torricelli

et al. 2010

Acta Hortic.

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Absorption and scattering of laser light pulse passing through the fruit determine among others, the optical properties of the product. Efforts have been made in the recent past to utilize innovative techniques such as time-resolved reflectance spectroscopy (TRS) to study the quality aspects of different fruit such as nectarines. These optical properties have been well related to firmness, sugars, acids and other quality attributes. TRS measurements were performed on 'Jubileum' plums at two different wavelengths: 670 nm and 758 nm. The fruit were harvested in Norway and brought to Italy under protected conditions. After sorting the fruit by size, TRS measurements were made and the fruit were randomized for different examinations of quality aspects. It was observed that the absorption coefficient (µ a ) increased for both wavelengths as ripening progressed towards the melting stage of the fruit. The µ a values at 670 nm were higher than those at 758 nm. The higher rate in the µ a was distinguishable from the third day onwards as the fruit ripened. Similarly, it was interesting to note that the internal colour measured after destructing the fruit related well with the TRS absorption coefficient (µ a ), i.e., a decrease in the CIE L* (towards darker region) and b* (towards blue) value along with an increase in a* (towards red) from third day of storage.

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Section: Resultscontrasting

confidence: 99%

“…Optical methods such as time-resolved reflectance spectroscopy (TRS) have been used in the recent past to study the different quality aspects in nectarines Jacob et al, 2006;Vanoli et al, 2007). The method is potentially feasible for non-destructive probing of fruit tissues to a depth of 2 cm and more.…”

Section: Introductionmentioning

confidence: 99%

Optical Absorption and Scattering Phenomena in 'Jubileum' Plums in Relation to Their Colour Properties

Jacob¹,

Vangdal²,

Torricelli

et al. 2010

Acta Hortic.

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“…The change in µ a during storage is reported in Tijskens et al (2006). The behaviour of µ a , the absorption by the fruit flesh of laser light at 670 nm, clearly shows a sigmoidal behaviour.…”

Section: Methodsmentioning

confidence: 99%

Biological Variation in Ripening of Nectarines

Tijskens

Zerbini

Schouten

2007

Journal of Fruit and Ornamental Plant Research

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SummaryThe optimal harvest date of nectarines can no longer be based on the colour since newer cultivars have an intensive blush, even in the unripe stage. Measuring the absorption of the fruit flesh by Time Resolved Spectroscopy (TRS) at 670 nm, provide information on the ripening stage and the variation in ripening stages of batches of fruit. Since each individual fruit is harvested and measured at some arbitrary stage of development, the analysis of the data gathered was based on the system of the biological shift factor (Tijskens et al. 2005) applying non-linear mixed effects regression analysis. The results show that µ a , and therefore also the fruit flesh colour and chlorophyll content, change according a sigmoidal pattern, which was approximated with a symmetrical logistic function. The explained parts obtained (R 2 adj ) were about 0.97 for storage at 20ºC and about 0.86 at 10ºC. The rather large variation on apparent behaviour between individual fruit, each with its own stage of development, was nicely taken care of by the system of the biological shift factor. During ripening, the distribution of the biological shift factor was constant and normal, while the distribution of µ a changed. Also that change in distribution over time is nicely described by the system and models used.

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“…Tijskens et al (2006) reported a decrease in the µ a value at 670 nm of nectarines during storage. In plums the absorption coefficients (µ a ) at 670 nm increased as the storage period advanced, while the absorption coefficients (µ a ) at 758 nm decreased the first two days of storage and then increased (Jacob et al, 2010).…”

Section: Discussionmentioning

confidence: 98%

“…To solve similar challenges in red nectarines, the TRS-method has been used (Eccher Zerbini et al, 2006;Jacob et al, 2006;Vanoli et al, 2007). In postharvest research TRS-measurements may reveal mealiness in apples (Valero et al, 2001) and internal browning (brown heart) in pears (Eccher Zerbini et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

TRS-Measurements as a Nondestructive Method Assessing Stage of Maturity and Ripening in Plum (Prunus Domestica L.)

Vangdal¹,

Vanoli²,

Zerbini³

et al. 2010

Acta Hortic.

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In plum fruit with dark red or blue blush colour covering the whole fruit, the change in ground colour from green to yellow during maturation and ripening is masked. Hence, the maturity stage is difficult to judge. Time-resolved reflectance spectroscopy (TRS) has been used as a nondestructive method to assess changes in important internal quality factors in 'Jubileum' plums (Prunus domestica L.). Absorption coefficients (µ a ) and scattering coefficients (µ s ) were measured at both 670 and 758 nm during 5 days of storage. The changes in soluble solids content, titratable acidity and firmness were as expected. No change in soluble solids content was observed, while the plums became less acid and softer during storage. The TRSmeasurements of plums indicated that TRS could give interesting information on internal quality factors in plums as the absorption at 670 nm was closely related to firmness, TA and TSS at the time of picking. Absorption at 758 nm was more closely related to the quality parameters after storage. The study did not indicate that scattering could be used in assessing maturity stage in plum.

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Effects of maturity on chlorophyll-related absorption in nectarines, measured by non-destructive time-resolved reflectance spectroscopy

Cited by 25 publications

References 17 publications

Optical Absorption and Scattering Phenomena in 'Jubileum' Plums in Relation to Their Colour Properties

Optical Absorption and Scattering Phenomena in 'Jubileum' Plums in Relation to Their Colour Properties

Biological Variation in Ripening of Nectarines

TRS-Measurements as a Nondestructive Method Assessing Stage of Maturity and Ripening in Plum (Prunus Domestica L.)

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