Total soluble solid content (TSS) and tritatable acidity (TA) were
measured on 6 slices randomly chosen from the remaining
6 packages/landrace. Total soluble solids (TSS) content was
measured using a digital refractometer (Atago Palette PR-32 digital
refractometer, Atago Co., Ltd-Tokyo, Japan). Titratable acidity (TA)
was measured on 5 g of
filtered juice and with 50 mL of distilled
water. The sample was titrated to pH 8.2 with 0.1 N NaOH and the
results were expressed as mass of malic acid per volume of juice,
g L1.
2.5. Package CO2 and O2 analysis
At each sampling date, six bags per landrace were used to
measure CO2 and O2 content in the bag headspace using a PBI
Dansensor Checkpoint O2 and CO2 analyzer (Topac, Hingham, MS,
USA) with zirconium and infrared detectors, respectively.