Sürdürülebilir Kalkınma Amaçları

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• MakaleYalnız künye2024Scopus SJRQ1/r/munzur/1551
  Optimization of Pectin Extraction from Lemon Peel Powder by Ohmic Heating Using Full Factorial Design

  Çilingir, Seda; Duran, Gülseven; Gökyildiz, Beritan; Goksu, Ali; Sabanci, Serdal; Cevik, Mutlu

  Ohmic heating-assisted extraction has emerged as an effective method preferred in recent years. This extraction method is affected by experimental factors such as temperature, process time, and voltage gradient. The present study aimed to optimize the pectin extraction process from lemon peel powder samples by the ohmic heating-assisted extraction method. In this study, the effects of 3 different voltage gradients (7, 9, and 11 V/cm), 3 different solid to liquid ratios (1:20 g/mL, 1:40 g/mL, and 1:60 g/mL), and 3 different holding times (0, 60, and 120 min) and their interactions were investigated to determine the optimum extraction condition at constant temperature (80 °C) and pH = 1 sulfuric acid solution. The factors examined in the optimization procedure were pectin yield, power consumption, and energy efficiency. The optimum conditions were found to be 11 V/cm voltage gradient, 1:60 g/mL solid to liquid ratio, and 120-min holding time with a desirability value of 0.778. The results of this study could give important information about the design of industrial scale ohmic heating units, especially from different food wastes in industrial pectin production.

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  AtıfScopus7·WoS7·OpenAlex5

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• Yüksek Lisans TeziAçık Erişim2023/r/munzur/6906
  Farklı oranlarda meyve suyu ilave edilerek elde edilen fermente badem sütünün bazı kalite özelliklerindeki değişimin belirlenmesi

  Gülseven Duran

  Bu çalışmada, 3 farklı oranda (%10, %20 ve %30) ve iki çeşit (portakal ve ananas suyu) %100 meyve suyu ilave edilmiş ve edilmemiş fermente badem sütü örneklerinin bazı kalite özellikleri (pH, titrasyon asitliği), Lactobacillus acidophilus canlılığı, küf ve maya sayıları, reolojik özellikleri ve duyusal değerlendirmelerindeki değişimler incelenmiştir. Farklı oranlarda portakal ve ananas suyu ilave edilmiş ve edilmemiş fermente badem sütü örneklerinin pH değerlerinin fermantasyon aşaması sonunda sırasıyla 3.97–4.40 ve 3.99-4.28 arasında değiştiği, depolama aşaması boyunca ise 7. ve 14. günde sırasıyla 4.33-4.77 ve 4.48-4.95, 4.35-4.87 ve 4.54-4.93 arasında değiştiği tespit edilmiştir. Farklı oranlarda portakal ve ananas suyu ilave edilmiş ve edilmemiş fermente badem sütü örneklerinin titrasyon asitliği değerlerinin ise fermantasyon aşaması sonunda sırasıyla %0.178–%0.478 ve %0.186-%0.360 arasında değiştiği ve ilave edilen meyve suyu çeşidine bağlı olmadan depolama işlemi boyunca değerlerin artış gösterdiği belirlenmiştir. En düşük pH ve en yüksek titrasyon asitliği değerlerinin hem portakal suyu hem de ananas suyu ilave edilen örnekler için %30 oranında meyve suyu ilave edilmiş örneklerde elde edilmiştir. Portakal suyu ilave edilmiş fermente badem sütü örneklerinin L. acidophilus içeriğinin fermantasyon aşaması sonunda 7.58-7.95 log kob/ml arasında değiştiği, depolama işlemi boyunca hafif bir azalma eğilimi gösterdiği belirlenmiştir. Ananas suyu ilave edilmiş fermente badem sütü örneklerinde ise fermantasyon aşaması sonunda L. acidophilus miktarı 7.31-7.67 log kob/ml arasında değiştiği ve depolama işlemi boyunca hafif bir azalma eğilimi gösterdiği tespit edilmiştir. Farklı oranlarda portakal ve ananas suyu ilave edilmiş ve edilmemiş fermente badem sütü örneklerinin hiçbirinde küf ve maya tespit edilmemiştir. Farklı işlem koşulları kullanılarak üretilen fermente badem sütü örneklerinin tümünün Newton olmayan psödoplastik akış davranışı gösterdiği belirlenmiştir. Ayrıca portakal ve ananas suyu ilave edilmiş ve edilmemiş fermente badem sütü örnekleri için en uygun reolojik modellerin sırasıyla Üssel ve Herschel-Bulkley modeli olduğu belirlenmiştir. Yapılan duyusal değerlendirme sonucunda ise, farklı oranlarda portakal ve ananas suyu ilave edilmiş ve edilmemiş fermente badem sütü örnekleri için genel kabul edilebilirliğin %30 meyve suyu ilave edilen örneklerde olduğu tespit edilmiştir. Elde edilen bu çalışmanın sonuçlarının endüstriyel ölçekte kurulabilecek ekipman ve pompalama sistemleri için değerli bilgiler sağlayabileceği düşünülmektedir.

  İncele
• MakaleYalnız künye2022Scopus SJRQ2/r/munzur/2509
  Performance evaluation of pectin extraction from grapefruit peel powder by ohmic heating

  Goksu, Ali; Duran, Gülseven; Çilingir, Seda; Çevik, Mutlu; Sabanci, Serdal

  This study is to investigate the performance properties during the extraction of pectin from grapefruit peel powder using ohmic heating. Pectin extraction was carried out under different voltage gradients (7–11 V/cm), different solid: liquid ratios (1:20–1:60), and different holding times (0–180 min) at constant pH and temperature (80°C). The voltage gradient and solid: liquid ratio affected the time to reach the target temperature. The highest energy efficiency value for all voltage gradients and solid: liquid ratios were obtained in the 0 min holding time, and the efficiency value, which changed between 89.47% and 56.02%, was negatively affected by the increase in the holding time. The exergy efficiency was lower than the energy efficiency and decreased due to the increasing holding time and decreasing voltage gradient. Also, the exergy efficiency was found to be between 73.69% and 18.09%. Determining the performance characteristics of the system will make a significant contribution to pilot and industrial-scale system/process applications for the future. Practical application: In this study, pectin was successfully obtained from grapefruit powder using an ohmic heating system. The operating conditions for the obtained pectin include constant pH (pH:1) and temperature (80°C) but various voltage gradients, solid: liquid ratios, and extraction times. It has been observed that voltage gradient and extraction time were effective on energy efficiency. When looking at exergy efficiency, voltage gradient, solid: liquid ratio, and extraction time were effective. It has been observed that the improvement potential (IP) value calculated for the system decreases depending on the increasing voltage gradient. The results obtained in this study are thought to be an important data source for literature, pilot, and industrial-scale production systems. It has been realized that ohmic heating, which is increasingly used, is an alternative technique for pectin production.

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  AtıfScopus13·WoS12·OpenAlex16

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• MakaleYalnız künye2022Scopus SJRQ2/r/munzur/2427
  Investigation of the changes in rheological properties and some quality characteristics of probiotic fermented almond milk with added different ratios of orange juice

  Duran, Gülseven; Cevik, Mutlu

  In this study, the changes in pH, titratable acidity, survival of Lactobacillus acidophilus, mold and yeast counts, rheological properties, and sensory evaluation of fermented almond milk samples with and without added 100% orange juice at three different ratios (10%, 20%, and 30%) were investigated. pH and titratable acidity values of fermented almond milk samples varied between 3.97–4.40 and 0.178%–0.478% at the end of the fermentation process, respectively. It was determined that the survival of L. acidophilus content of fermented samples varied between 7.58 and 7.95 log CFU/ml. The best suitable rheological model for the flow behavior of all fermented almond milk samples was the Power-Law model. Fermented almond milk samples with added 20% and 30% orange juice was more preferred by the panelists. It is thought that the results of this study could provide valuable information for equipment and pumping systems that can be installed on an industrial scale. Practical applications: In recent years, cereals (oats, rice, corn), legumes (soybean, cowpea, chickpea), oilseeds (sesame, sunflower, flaxseed), and hard-shelled fruits (almond, coconut, hazelnut, peanut, walnut) is widely used in the production of plant milk. In this study, the changes in some quality and rheological properties of fermented almond milk samples with added different ratios of orange juice were investigated. It was determined that all fermented almond milk samples had high probiotic content at the end of the fermentation stage. As a result of the sensory evaluation, it was determined that the acceptability of fermented almond milk with added 20% and 30% orange juice was very high compared to other samples.

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  AtıfScopus2·WoS2·OpenAlex2

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