Fıstık sert kabuğunun mikrodalga-CO₂ destekli hidroliz sistemi ile ksiloza hidrolizi

Amaç: Bu çalışmanın amacı, fıstık işleme sırasında açığa çıkan fıstık sert kabuğunu yeşil bir yaklaşım ile ksiloza hidroliz etmektir. Materyal ve yöntem: Fıstık sert kabuğunu ksiloza hidrolize etmek için mikrodalga-karbondioksit (CO2) destekli hidroliz yöntemi kullanılmıştır. Bu kapsamda, hidroliz parametrelerinin etkisi sıcaklık (175-220°C), işlem süresi (15-45 dk.) ve su:fıstık kabuğu oranı (5:1-30:1) aralıklarında incelenmiştir. Tartışma ve sonuç: En yüksek ksiloz veriminin elde edildiği parametreler sıcaklık, reaksiyon süresi ve su:fıstık kabuğu oranı için sırasıyla 200°C, 20 dk. ve 20 mL/g olarak belirlenmiştir. Çalışılan aralıklarda gerçekleştirilen hidroliz denemelerinde en yüksek ksiloz verimi %56,52, bu noktadaki yan ürünler miktarı (furfural, hidroksimetilfurfural (HMF) ve formik asit) ise %15,67 olarak bulunmuştur. Sıcaklığın 200°C’nin üstüne çıktığı durumlarda yan ürünlerde ciddi bir artış gözlenmiştir. Çalışmanın sonuçları göz önünde bulundurulduğunda lignoselülozik biyokütlenin hidrolizinde mikrodalga-CO2 destekli hidroliz umut vaat eden yenilikçi bir metot olarak değerlendirilebilir.

Hydrolysis of pistachio shell into xylose using microwave-CO2 assisted extraction system

Aim: The aim of this study is to hydrolyze the pistachio shell generated during the processing of pistachio into pistachio kernel to xylose using a green approach. Material and method: Microwave-CO₂ assisted hydrolysis method was used to hydrolyze pistachio shell into xylose. In this respect, the effect of hydrolysis parameters, temperature (175-220°C), time (15-45 min) and pistachio shell:water ratio (1:5-1:30) were evaluated. Results and discussion: The highest xylose yield was obtained at 56.52% while by-products (furfural, hydroxymethylfurfural (HMF) and formic acid) were 15.67% under the same conditions. The by-products were observed in a significant rise when increasing the temperature over 200°C. Considering the results, microwave-CO₂ assisted hydrolysis can be affiliable as a promising innovative method for hydrolysis of lignocellulosic biomass.

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