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Öğe Chitosan coating for extending postharvest quality of tomatoes (Lycopersicon esculentum Mill.) maintained at different storage temperatures(AMER INST MATHEMATICAL SCIENCES-AIMS, 2018) Kibar, Hayriye Fatma; Sabir, Ferhan K.The growing consumer demand for produces without chemical residues has focused efforts on the assessment of innovative natural antimicrobials. In this context, chitosan, derived from abundantly available chitin sources such as crab, shrimp and insects, has been reported to possess an excellent film-forming ability and inherent antimicrobial properties suitable for development of edible antimicrobial films. Thus, the present study was established to study the effect of chitosan coating on extending postharvest quality of fresh tomatoes (Lycopersicon esculentum Mill. cv. 'Diamentino') maintained at two different storage temperatures (5 degrees C with 90% relative humidity and 21 degrees C with 65% relative humidity). Coating the tomatoes with chitosan solutions reduced the weight loss, with greater effect at 1% than 0.5 or 2% concentrations. Chitosan-coated tomatoes were firmer, higher in titratable acidity, and exhibited less biochemical changes than the control fruit at the end of storage. The loss in visual quality was significantly reduced by coating the fruits with chitosan solutions of 0.5, 1.0 and 2.0% as compared to the control. Among the applied concentrations, chitosan at 1% can be recommended as it was pioneering for most of the parameters analyzed during cold storage at both 5 degrees C for 20 d and at 21 degrees C for 10 d. Due to its lower cost and convenience to human health, chitosan may be one of the attractive and effective biopolymers for achieving adequate conservation of fresh tomatoes.Öğe Effects of modified atmosphere packing and honey dip treatments on quality maintenance of minimally processed grape cv. Razaki (V. vinifera L.) during cold storage(SPRINGER INDIA, 2011) Sabir, Ali; Sabir, Ferhan K.; Kara, ZekiIncreasing pressure in food conservation sector to replace chemical applications has urged researchers to focus on studying new strategies of extending the postharvest life of produces. In such efforts, numerous materials have been tested for their effectiveness as well as suitability in organic consumption. In this study, effects of modified atmosphere packing (MAP) and honey solution dip on maintenance of quality of minimally processed table grape cv. Razaki were investigated. During the storage at 0 A degrees C with relative humidity of 90%, MAP, honey dip, and their combined applications significantly retarded the weight loss of berries that retained about 2 mm of cap stem. Soluble solid contents of all berries slightly increased, while their acid amounts decreased, resulting in consecutive rises of maturity index. With respect to the sensory score, calculated as mean of ten panelists, honey treatment alone was ranked the highest while control berries had significantly lower value. Overall, MAP, honey solution dip or their combination significantly maintained the general quality of minimally processed grape by delaying quality loss and berry decay. Therefore, honey solution dip yielded promising results to use as an edible organic coating barrier to moisture and resist to water vapor diffusion during the cold storage, offering a good adherence to berry surface.Öğe EXTENDING POSTHARVEST QUALITY ATTRIBUTES OF GRAPES (V. vinifera L. cv. 'THOMPSON SEEDLESS') BY PREHARVEST CALCIUM PULVERIZATIONS(WYDAWNICTWO AKAD ROLNICZEJ W LUBLINIE, 2017) Sabir, Ferhan K.; Sabir, AliDemand for fresh grape is increasing globally in accordance with the improvement in living standard since the grape berry contains large amounts of phytochemicals including anthocyanins, phenolics, flavonoids and resveratrol, which have been suggested to be responsible for human health benefits. However, table grapes easily undergo deterioration due to their soft texture and the high water content, which make it difficult to preserve without treatment. This study was thus conducted to evaluate the effect of preharvest calcium sprays on maintenance of postharvest quality of grapes (V. vinifera L. cv. 'Thompson Seedless'). Three preharvest calcium sprays were applied to leaves and developing green berries with or without leaf removal pruning (a traditional practice performed in commercial vineyards worldwide) during berry development stages. After harvest, grapes were cold stored (1 degrees C, 90% R. H.) up to 3 months. Preharvest micronized calcium sprays, with or without leaf removal pruning, markedly extended the postharvest quality of grapes by delaying weight loss, reducing decay, maintaining rachis chlorophyll concentrations and preserving visual quality during the prolonged cold storage. Besides, in calcite-treated grapes, lower titratable acidity decrease courses with a subsequent lower maturity index during prolonged storage indicate that calcite sprays restricted postharvest physiological senescence of grapes. Overall findings indicated that preharvest calcite sprays may be an environmental-friendly, healthy and sustainable viticulture practice for extending postharvest quality of grapes.Öğe Postharvest quality extension of minimally processed table grapes by chitosan coating(TAYLOR & FRANCIS INC, 2019) Sabir, Ferhan K.; Sabir, Ali.; Unal, Sevil.; Taytak, Merve.; Kucukbasmaci, Alper.; Bilgin, Omer Faruk.Demand for fresh grapes is increasing globally due to their rich composition in phenolic compounds, which have a strong antioxidant capacity. However, fresh table grapes deteriorate rapidly due to berry water loss and pathogen growth, which make it difficult to preserve without treatment. Chitosan coating, as a healthy, simple and innovative technology against to common SO2 fumigation, was tested at various concentrations (0%, 0.5%, 1.0% and 2.0%) for the effectiveness on postharvest quality extension of detached grapes of 'Alphonse Lavallee' cultivar. Chitosan coating at all doses significantly retarded the loss in berry weight, extended the skin rupture force and total phenol content. Visual quality was higher due to coating the berries with chitosan. Chitosan at all concentrations was effective on delaying maturity index (used to express postharvest senescence) and changes in berry colour values such as L*, C and Hue angle. Among the applied doses, 1% chitosan solution can be recommended to apply since higher doses were more effective with similar results on overall quality features of berries. Overall findings demonstrated that chitosan as an edible coating with their unique barrier can be utilized as a natural preservative of detached grapes to extend the postharvest quality up to 28 days.Öğe Postharvest Quality Maintenance of Table Grapes cv. 'Alphonse Lavall,e' by Exogenous Applications of Salicylic Acid, Oxalic Acid and MAP(SPRINGER, 2017) Sabir, Ferhan K.; Sabir, AliTreating the grape with elicitors such as jasmonic, oxalic or salicylic acid can reportedly activate several defense mechanisms, including the accelerated expression of defense genes, enhances in the cell wall composition, and the accumulation of antimicrobial compounds such as phytoalexins. Salicylic acid (SA) and oxalic acid (OA) with or without MAP (Modified Atmosphere Packaging) were tested for their effects on extending storage life of grapes cv. 'Alphonse Lavall,e'. After treatments (control, MAP, 5 mM OA, 2 mM SA, SA + MAP, OA + MAP) grapes were stored at 1 A degrees C, 90% R.H. up to 60 days. Overall, all the treatments had significant positive effects on postharvest quality of grapes. SA + MAP was the most effective treatment with the lowest weight loss and decay incidence, the greatest rachis chlorophyll content and berry detachment force at the end of 60 d storage. Effects of SA were also very close to those obtained by the combined treatment. SA alone or SA + MAP treatment may be recommended as an environmental friendly, healthy and sustainable method for extending postharvest quality of grapes up to 60 d, without significant adverse effect on produces. Considering the cost and ease of application, SA alone could be preferred as an effective alternative strategy for traditional chemical treatments.Öğe Postharvest quality response of broccoli florets to combined application of 1-methylcyclopropene and modified atmosphere packaging(SCIENTIFIC AGRICULTURAL SOC FINLAND, 2012) Sabir, Ferhan K.Broccoli is rich in health-promoting compounds such as ascorbic acid and glucosinolates. However, amount of such compounds inevitably decrease along with the storage. This study was conducted to investigate the effects of 1-methylcyclopropene (1-MCP) and Modified Atmosphere Packaging (MAP) treatments alone or in combination on postharvest life and quality of broccoli heads during cold storage. MAP and 1-MCP+MAP significantly reduced weight loss, delayed surface color changes and chlorophyll breakdown, maintained visual quality, ascorbic acid, total phenol, soluble solid contents and titratable acidity compared with control as well as 1-MCP treatment. In 1-MCP plus MAP treated florets, approximate 47% and more chlorophyll and 24% more total phenol contents were found compared to control florets. 1-MCP plus MAP application better performed in maintaining the quality of broccoli florets during 28-day-storage. Overall results revealed that combined treatment can be recommended for commercial broccoli storage at 0 degrees C.Öğe Pre-harvest micronized calcium and postharvest UV-C treatments extend the quality of 'Crimson Seedless' (Vitis vinifera L.) grapes(SPRINGER, 2019) Sabir, Ferhan K.; Sabir, Ali.Certain postharvest disorders such as rachis desiccation, weight loss, accelerated softening and biochemical changes limit the postharvest life of table grapes. The present study was conducted to evaluate the effect of pre-harvest micronized calcium pulverizations, postharvest UV-C treatment and their combined applications on extending postharvest quality of table grapes cv 'Crimson Seedless'. Pre-harvest micronized calcium pulverization was performed to improve rachis greenness and berry resistance while postharvest UV-C was aimed to induce physiological resistance and delay senescence in grape berries. Ca treatments significantly increased chlorophyll concentrations of rachis while Ca plus UV-C was the best treatment to maintain rachis chlorophyll concentration. UV-C with or without pre-harvest Ca treatment effectively delayed the weight loss during the storage. Ca delayed the increase of SSC during the storage. All the treatments, particularly postharvest UV-C, significantly delayed the berry senescence by delaying the decrease in acidity. UV-C with or without Ca, with the lowest values, significantly retarded the changes in phenols and decreased the berry decay. Ca plus UV-C treatment also effectively maintained the skin rupture force during the storage. Overall, pre-harvest micronized Ca pulverizations plus postharvest UV-C treatment can be recommended to extent the quality of table grapes cv. 'Crimson Seedless' up to 120 days at cold storage.Öğe Quality response of table grapes (Vitis vinifera L.) during cold storage to postharvest cap stem excision and hot water treatments(WILEY, 2013) Sabir, Ferhan K.; Sabir, AliBerry quality, total phenol, sensory characteristics and decay incidence of grapes (V. vinifera cvs. Mukule and Red Globe) as affected by prestorage hot water immersion with or without cap stem excision treatments were investigated with 7-day interval during storage at 1 degrees C for 21days. Weight loss occurred mainly up to the second week and was more pronounced for the untreated control samples subjected to the stem excision. In Mukule, the least weight loss value was obtained from hot watertreated grapes (0.62%), while the highest loss occurred in control grapes of stem-excised berries (0.96%). Immersion of stem-retained grapes in hot water was the best applications for maintenance of overall storage quality for both cultivars. According to panellist scores, it is evident that hot water has positive effect on maintaining the minimally processed table grapes without altering the flavour and taste of the commodity. Stem-retained berries of hot water treatment had the highest score for both Mukule and Red Globe, with their values 3.8 and 4.2, respectively, while the least values were obtained from stem-excised berries of untreated control group of both the cultivars (1.9 and 3.0, respectively). At the end of three-week storage, the least decay rates were determined in stem-retained berries that received hot water treatment (5.3% for Mukule and 1.1% for Red Globe). Attenuate influence of brief high temperature exposure on ripening parameters (SSC, TA, MI, pH) was also observed. Postharvest hot water treatment may be used as a nonchemical means to extent storage life of minimally processed grapes with its alleviating effect on physiological disorders. Cap stem retaining in minimal processing can be recommended to maintain the quality of grapes.Öğe VINE GROWTH AND YIELD RESPONSE OF ALPHONSE LAVALLE (V-vinifera L.) GRAPEVINES TO PLANT GROWTH PROMOTING RHIZOBACTERIA UNDER ALKALINE CONDITION IN SOILLESS CULTURE(WYDAWNICTWO AKAD ROLNICZEJ W LUBLINIE, 2017) Sabir, Ali; Karaca, Ummuhan; Yazar, Kevser; Sabir, Ferhan K.; Yazici, M. Atilla; Dogan, Osman; Kara, ZekiHigh carbonate content in soil negatively affect plant growth, because the availability of nutrients is restricted due to high pH. The present investigations were carried out to reveal possible alleviating effects of the exogenous root inoculation PGPRs on development and physiology of soilless-grown grapevines cultivated under alkaline stress in controlled glass house. pH of growth medium was increased from 7.5 to the values ranging from 7.9 (control) to 8.1 (A18) according to the bacterial inoculations by NaHCO3 supplementations. Bacteria inoculations did not result in statistically significant differences in pH values of growth media. The bacterial population density found in the rhizosphere of grapevines ranged from 6 x 108 CFU mL(-1) (M-3) to 9 x 108 CFU mL(-1) (Ca-637). The highest value of shoot thickness was obtained from Ca-637 (5.3 mm), followed by A18 (5.2mm), while M3 did not significantly affected the shoot thickness. The greatest pruning residue per vine was obtained from A18 treatment (81.5 g), followed by Ca-637 (80.8 g) while the lowest value was determined in control. Vine yield was the greatest with A18 (1128 g) treatment and was followed by Ca 637 (1059 g). Considering the general observations, root inoculation of PGPRs A18 and Ca-637 may be recommended in enhancing bioremediation of alkali growth media.
