Browsing by Author "Koyuncu, Mehmet Ali"

Now showing 1 - 4 of 4
  • No Thumbnail Available
    Item
    Combined Effects of MAP and Postharvest Salicylic Acid Treatment on Quality Attributes of Dill (Anethum graveolens L.) Bunches during Storage
    (Ankara Üniversitesi, 2018-09-05) Koyuncu, Mehmet Ali; Güneyli, Atakan; Erbaş, Derya; Onursal, Cemile Ebru; Seçmen, Tuba; Ziraat Fakültesi
    The effects of combinations of modified atmosphere packaging (MAP) with salicylic acid (SA) treatment on storage and shelf life quality of dill (Anethum graveolens L. cv. Asder) leaves were investigated. After harvest, dill leaves were dipped into an aqueous solution containing different concentrations of salicylic acid (1, 2 and 4 mM) for 2 minutes. The control group was immersed in distilled water only for 2 minutes. Treated samples were dried with blotting paper and placed in modified atmosphere package and stored at 0 ºC and 90±5% relative humidity (RH) conditions for 25 days. After cold storage, dill leaves were kept at 10 ºC and 55-60% RH for 2 days to simulate commercial practice (shelf life), and analyzed for same quality parameters performed during cold storage. Weight loss, color, respiration rate, gas composition in package, soluble solids content (SSC) and ascorbic acid content were determined initially and at 5 dayintervals. The dill bunches were also evaluated for visual quality during storage period. According to the results, SA treatment allowed dill leaves to stay green longer than those of control group. 1 mM concentration of SA was the best treatment for prolonging the storage life of dill leaves with keeping the quality.
  • No Thumbnail Available
    Item
    Effect of Preharvest Calcium Chloride Treatment on Some Quality Characteristics and Bioactive Compounds of Sweet Cherry Cultivars
    (Ankara Üniversitesi, 2022) Erbaş, Mehmet; Koyuncu, Mehmet Ali; Other; Other
    The effects of preharvest calcium chloride (CaCl2) treatment on some quality characteristics and bioactive compounds of sweet cherry fruit (Prunus avium L. cvs. 0900 Ziraat, Sweetheart and Merton Late) were investigated. The CaCl2 (1%) solution was sprayed to the cherry trees at 21 and 35 days after full bloom stage. The trees served as control were treated with distilled water at the same days. CaCl2 treatment remarkably suppressed the respiration rate and increased titratable acidity and fruit firmness of cherries. Treated fruit had more attractive skin colour with higher h° and L* values compared to control. The individual soluble sugars and total sugar contents of CaCl2 treated cherries were lower than those of control fruit. The accumulation of ascorbic acid, stem chlorophyll, total phenolics and anthocyanin contents of fruit were delayed by CaCl2 treatment in all varieties. The antioxidant activities of all treated varieties were lower than those of control fruit. Based on these results, it can be set forth that preharvest CaCl2 treatment suppressed ripening processes including respiration rate and maintained firmness and titratable acidity of cherries by maintaining cell integrity in all varieties during the fruit development period
  • No Thumbnail Available
    Item
    Improvement Storability of ‘Angeleno’ Plum with the Combination of 1-Methylcyclopropene Treatment and Controlled Atmosphere Storage
    (Ankara Üniversitesi, 2018-12-05) Koyuncu, Mehmet Ali; Erbaş, Derya; Koyuncu, Fatma; Ziraat Fakültesi
    The combined effects of postharvest 1-methylcyclopropene (1-MCP) treatment and controlled atmosphere (CA) storage on storage life and quality of ‘Angeleno’ (Prunus salicina Lindl.) plum were investigated after being treated with 1-MCP (625 ng g-1) at room temperature for 12 h. Following the treatment, fruit were stored in normal atmosphere (NA) and CA (1% O2-3% CO2) at 0 ºC and 90±5% relative humidity for 120 d. Fruit firmness, weight loss, respiration rate, ethylene production, soluble solid content, titratable acidity, fruit skin color and sensorial evaluation (external appearance, taste and chilling injury) were performed at harvest date and one month intervals during storage. Only 1-MCP treatment delayed the change in properties related to fruit ripening such as fruit softening, decrease in titratable acidity and increase in soluble solid content. Nevertheless, these effects were significantly higher when 1-MCP-treated plums were stored in CA conditions. The highest color change was found in NA conditions. ‘Angeleno’ plum stored in CA conditions gave the best results in terms of some quality parameters during storage. The combination of 1-MCP and CA storage prolonged storage life of ‘Angeleno’ plum compared to other treatments. These result demonstrated that the postharvest 1-MCP treatment can be used in the cold storage of Angeleno plums.
  • No Thumbnail Available
    Item
    Role of Controlled Atmosphere, Ultra Low Oxygen or Dynamic Controlled Atmosphere Conditions on Quality Characteristics of ‘Scarlet Spur’ Apple Fruit
    (Ankara Üniversitesi, 2021-09-04) Onursal, Cemile Ebru; Koyuncu, Mehmet Ali; Ziraat Fakültesi
    In this study, the effects of three cold storage technologies, (i) controlled atmosphere-CA (CO2 4%, O2 3%), (ii) ultra low oxygen-ULO and (iii) dynamic controlled atmosphere-DCA, were investigated on fruit quality of ‘Scarlet Spur’ apples stored during 10 months plus 7 days of shelf life at 20 °C. After harvest, apples were stored at 0 °C and 90±5% relative humidity during 10 months in CA, ULO (CO2 3%, O2 1%,) and DCA (CO2 1%, O2 0.5%) conditions. HarvestWatch™ sensors were used for assessment of lower oxygen limit (LOL) of fruit during DCA storage. DCA was the best storage condition suppressing ethylene synthesis and respiration rate during storage. The ULO and DCA conditions showed similar results in the maintenance of firmness and TA amount. Weight loss in these conditions was also lower than CA. No significant difference was observed between storage conditions in terms of SSC. DCA technology gave better results in maintaining color of ‘Scarlet Spur’ than other conditions during cold storage. Result showed that; ULO and DCA conditions were more effective in maintaining quality compared to CA in terms of all quality parameters.