Açil klorürler ile esterlenmiş karakavak (Populus nigra L.) talaşına ait hemiselülozların kimyasal karakterizasyonu

Bu çalışmada, orman ürünleri endüstrisinde büyük miktarlarda lignoselülozik atık olarak açığa çıkan karakavak (Populus nigra L.) talaşından hemiselülozlar izole edilmiştir. Hemiselülozların monosakkarit bileşimi gaz kromatografisi ile belirlenmiştir. Ksiloz, %81.13 ile baskın monosakkarit birimi olarak tespit edilmiştir. İzole edilmiş hemiselülozlar daha sonra oktanoil, dekanoil ve lauroil klorür ile esterlenmiş ve elde edilen türevler yüzde verim, sübstitüsyon derecesi (DS), çözünürlük, Fourier dönüşümlü kızılötesi spektroskopisi (FTIR) ve termogravimetrik analiz (TGA) ile karakterize edilmiştir. Hemiselüloz türevlerinin DS değerleri 0.83 ile 0.97 arasında değişirken, yüzde verimleri %61.54 ile %62.31 arasında yer almıştır. FTIR analizi esterlenmeyi destekleyen sonuçlar sunmuştur. TGA, hemiselüloz türevlerinin, doğal hemiselülozlardan daha düşük termal stabiliteye sahip olduklarını göstermiştir. Çözünürlük analizi, esterlenmenin hemiselülozların hidrofobik kapasitesini geliştirdiğini ortaya koymuştur. Genel olarak çalışma, elde edilen hemiselüloz türevlerinin, endüstriyel kullanıma yönelik biyolojik olarak bozunabilir ve çevre dostu plastik, reçine, film ve kaplama ürünlerinin elde edilmesinde kullanılabileceğini göstermiştir.

Anahtar Kelimeler:

Sübstitüsyon derecesi, Esterlenme, Hemiselülozlar, Yüzde verim, Çözünürlük, Termal stabilite

Chemical characterization of black poplar (Populus nigra L.) sawdust hemicelluloses esterified with acyl chlorides

In the present study, hemicelluloses were isolated from black poplar (Populus nigra L.) sawdust, which is generated by the wood industry in large quantities as lignocellulosic waste. The monosaccharide composition of hemicelluloses was determined by gas chromatography. Xylose was the predominant monosaccharide unit, at 81.13%. Isolated hemicelluloses were then esterified with octanoyl, decanoyl, and lauroyl chloride, and the produced derivatives were characterized in terms of percent yield, degree of substitution (DS), solubility, Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). Hemicellulose derivatives had DS values ranging from 0.83 to 0.97, and percent yields ranging from 61.54% to 62.31%. FTIR analysis confirmed esterification. TGA indicated that the hemicellulose derivatives offered lower thermal stabilities than native hemicelluloses. Solubility analysis indicated that esterification increased the hydrophobic capacity of hemicelluloses. Generally, the hemicellulose derivatives obtained could be used to make biodegradable and environmentally friendly plastics, resins, films, and coatings for industrial utilization.

Keywords:

Degree of substitution, Esterification, Hemicelluloses, Percent yield, Solubility, Thermal stability,

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