|Authors: ||Z.S. Ilić, Lj. Sunić, L. Milenković|
|Keywords: ||celeriac, harvest time, postharvest treatment, storage condition, quality|
The purpose of this study was to examine the effect of harvest time (November or January) and postharvest treatments (hot water, H2O2, NaOCl and non-washed NDASH control) of celeriac (Apium graveolens var. rapaceum 'Mentor') on the changes in different storage conditions S-1 (0°C; >95% RH) or S-2 (0-5°C; 85-92% RH) during 180 or 120 days of storage period (SP). At the end of SP the percentage water loss ranged from 4.93% (from second harvest inside the S-1 with NaOCl treatment) to 39.29% (from first harvest in S-2 in control-unwashed root). The dry matter (DM) values (10.60-12.40%) increased gradually during cold storage up to 49.41% (in S-2 at first harvest with NaOCl treatment). During SP, total sugar content (1.74-3.03%) increased more in S-2 cooling room.
Sucrose is the predominant sugar in celeriac roots (1.67-2.67%). Content of glucose (0.05-0.15%) and fructose (0.03-0.09) is much smaller.
Depend on storage condition and postharvest treatment, glucose and fructose concentrations also increased significantly during SP but to a much lower level than sucrose.
Nitrate levels at harvest time ranged from 430 to 675 mg kg-1 fresh weight (FW). Storage condition (S-2) and stage of maturity (first harvest) resulted in nitrate accumulation up to 882.3 mg kg-1 FW. Nitrate content in celeriac roots increased with prolonged storage in both storage rooms and all treatments.
Storage at cold room (S-1) after different washing treatments is a practical strategy for reducing loss and maintenance quality in the celeriac during prolonged storage.
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