Production and characterization of films from cotton stalk xylan

Goksu E. I., Karamanlioglu M., Bakir U., YILMAZ L., YILMAZER Ü.

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, cilt.55, sa.26, ss.10685-10691, 2007 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 55 Sayı: 26
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1021/jf071893i
  • Dergi Adı: JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.10685-10691
  • Anahtar Kelimeler: hemicellulose, xylan, lignin, cotton stalk, film, birchwood xylan, VAPOR BARRIER PROPERTIES, WHEAT GLUTEN FILM, MECHANICAL-PROPERTIES, DRYING TEMPERATURE, RELATIVE-HUMIDITY, EDIBLE FILMS, PROTEIN, WATER, HEMICELLULOSE, COATINGS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Composite film production based on cotton stalk xylan was studied, and the mechanical and physical properties of the films formed were investigated. Xylan and lignin were separated from cellulose by alkali extraction and, then, lignin was removed using ethanol, washing. Self-supporting continuous films could not be produced using pure cotton stalk xylan. However, film formation was achieved using 8-14% (w/w) xylan without complete removal of lignin during xylan isolation. Keeping about 1% lignin in xylan (w/w) was determined to be sufficient for film formation. Films were produced by casting the film-forming solutions, followed by solvent evaporation in a temperature (20 degrees C) and relative humidity (40%) controlled environment. The elastic modulus and hypothetical coating strength of the films obtained by using 8% xylan were significantly different from the ones containing 10-14% xylan. The water vapor transfer rates (WVTR) decreased with increasing xylan concentration, which made the films thicker. The glycerol addition as an additional plasticizer resulting in more stretchable films having higher WVTR and lower water solubility values. As a result, film production was successfully achieved from xylan, which was extracted from an agricultural waste (cotton stalk), and the film-forming effect of lignin on pure xylan has been demonstrated.