Abstract
With Time-resolved Reflectance Spectroscopy (TRS) the maturity of nectarines at harvest can be assessed by measuring the absorption coefficient at 670 nm (µa 670) in the fruit flesh. A kinetic model has been developed linking the optical properties as measured by TRS with the models of µa 670 and firmness decay in shelf-life at 20°C, making the prediction of the softening time for individual fruit possible. In order to study the influence of cold storage time prior to shelf life on the softening prediction, 540 (year 2003) and 870 (year 2004) ‘Spring Bright’ nectarines were measured at harvest with TRS; then fruit were put in shelf life after various periods of cold storage at 0°C (4 and 10 d, year 2003; 6, 13 and 20 days, year 2004). During the 5-day period of shelf life at 20°C, fruit were analysed for firmness by pressure test after 30, 48, 54, 72, 78, 96, 102 and 120h in 2003 and after 36, 43, 62, 87, 108 and 135h in 2004. For each year and cold storage time, the parameters of the logistic model of softening as a function of µa 670 at harvest were computed. The cold storage up to 13 days did not significantly influence the estimates of the softening rate constant (kf), of the maximum firmness at minus infinite time (Fmax) and of parameter alpha (a) in both years, whereas parameter beta (ß) in 2003 significantly decreased from -1.867 at day 4 to -2.237 at day 10. The further 7 days of cold storage in 2004 significantly affected kf, which decreased from 0.00084 at days 6 and 13 to 0.00069 at day 20, and ß which increased from -2.395 at day 6 to -2.053 at day 20. Our results indicate that the cold storage time significantly influences the softening prediction of nectarines as the longer the cold storage, the lower the softening rate
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Claims 6
Claim · model-written summary
Cold storage up to 13 days did not significantly change the estimates of kf, Fmax and alpha in either year.
- Taxon
- nectarines
Prunus persica var. nucipersicat0 - Treatment
- cold storage up to 13 dayse1
- Outcome
- estimates of the softening rate constant (kf), of the maximum firmness at minus infinite time (Fmax) and of parameter alpha (a)e1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The cold storage up to 13 days did not significantly influence the estimates of the softening rate constant (kf), of the maximum firmness at minus infinite time (Fmax) and of parameter alpha (a) in both years”
t0“NECTARINES”
Claim · model-written summary
In 2003, parameter beta significantly decreased from day 4 to day 10 of cold storage at 0°C.
- Taxon
- nectarinesPrunus persica var. nucipersicat0
- Treatment
- cold storage at 0°Ce2
- Outcome
- parameter beta (ß)e3
- Direction
- decreasede3
- Value
- -2.237e3
- Qualifier
- -1.867 at day 4e3
- Comparator
- day 4e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“then fruit were put in shelf life after various periods of cold storage at 0°C (4 and 10 d, year 2003”
e3“parameter beta (ß) in 2003 significantly decreased from -1.867 at day 4 to -2.237 at day 10”
t0“NECTARINES”
Claim · model-written summary
In 2004, further cold storage significantly decreased kf, to 0.00069 at day 20 from 0.00084 at days 6 and 13.
- Taxon
- nectarinesPrunus persica var. nucipersicat0
- Treatment
- further 7 days of cold storagee4
- Outcome
- kfe4
- Direction
- decreasede4
- Value
- 0.00069e4
- Qualifier
- 0.00084e4
- Comparator
- days 6 and 13e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The further 7 days of cold storage in 2004 significantly affected kf, which decreased from 0.00084 at days 6 and 13 to 0.00069 at day 20, and ß which increased from -2.395 at day 6 to -2.053 at day 20”
t0“NECTARINES”
Claim · model-written summary
In 2004, further cold storage significantly increased parameter beta, to -2.053 at day 20 from -2.395 at day 6.
- Taxon
- nectarinesPrunus persica var. nucipersicat0
- Treatment
- further 7 days of cold storagee4
- Outcome
- ße4
- Direction
- increasede4
- Value
- -2.053e4
- Qualifier
- -2.395 at day 6e4
- Comparator
- day 6e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The further 7 days of cold storage in 2004 significantly affected kf, which decreased from 0.00084 at days 6 and 13 to 0.00069 at day 20, and ß which increased from -2.395 at day 6 to -2.053 at day 20”
t0“NECTARINES”
Claim · model-written summary
Longer cold storage is associated with a lower softening rate of nectarines.
- Taxon
- nectarinesPrunus persica var. nucipersicat0
- Treatment
- cold storagee5
- Outcome
- softening ratee5
- Direction
- lowere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“the longer the cold storage, the lower the softening rate”
t0“NECTARINES”
Claim · model-written summary
A kinetic model linking TRS optical properties to firmness decay makes the softening time of individual fruit predictable.
- Taxon
- nectarinesPrunus persica var. nucipersicat0
- Outcome
- prediction of the softening time for individual fruite6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“making the prediction of the softening time for individual fruit possible”
t0“NECTARINES”
The same questions in other papers
cold · quality: postharvest · Prunus persica (peach)Positive and negative results
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