TY - JOUR
T1 - Mechanical, thermal, and antioxidant properties of composite films prepared from durum wheat starch and lignin
AU - Espinoza Acosta, José Luis
AU - Torres Chávez, Patricia Isabel
AU - Ramírez-Wong, Benjamín
AU - Bello-Pérez, Luis Arturo
AU - Vega Ríos, Alejandro
AU - Carvajal Millán, Elizabeth
AU - Plascencia Jatomea, Maribel
AU - Ledesma Osuna, Ana I.
N1 - Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Lignin conveys several important and useful characteristics to starch films depending on the lignin MW, extraction procedure, and lignin botanical source. In this study, lignin was obtained from durum wheat straw through the organosolv process, followed by fractionation according to solubility in alcohol. The alcohol-soluble lignin (ASL) was then used to prepare starch-ASL films. The mechanical properties, thermal stability, water solubility, color, and antioxidant activity of the resulting films were evaluated, and the starch-ASL films were also analyzed by means of SEM and attenuated total reflection infrared spectroscopy (ATR-IR). A procedure, to incorporate ASL, was developed and used to produce homogenous surfaces in starch-ASL films; agglomerations or undissolved particles of lignin were not observed in the starch matrix at microscopic level. ASL promoted significant decrease of the tensile strength (TS) and elastic modulus (EM), but an increase of elongation at break (EB) in films. Thermal analysis of the starch-ASL films showed high resistance to thermal degradation, due to the incorporation of ASL. In addition, the starch-ASL films exhibited antioxidant activity (2,2-diphenyl-1-picrylhydrazyl [DPPH]), which increased with increasing ASL content.
AB - Lignin conveys several important and useful characteristics to starch films depending on the lignin MW, extraction procedure, and lignin botanical source. In this study, lignin was obtained from durum wheat straw through the organosolv process, followed by fractionation according to solubility in alcohol. The alcohol-soluble lignin (ASL) was then used to prepare starch-ASL films. The mechanical properties, thermal stability, water solubility, color, and antioxidant activity of the resulting films were evaluated, and the starch-ASL films were also analyzed by means of SEM and attenuated total reflection infrared spectroscopy (ATR-IR). A procedure, to incorporate ASL, was developed and used to produce homogenous surfaces in starch-ASL films; agglomerations or undissolved particles of lignin were not observed in the starch matrix at microscopic level. ASL promoted significant decrease of the tensile strength (TS) and elastic modulus (EM), but an increase of elongation at break (EB) in films. Thermal analysis of the starch-ASL films showed high resistance to thermal degradation, due to the incorporation of ASL. In addition, the starch-ASL films exhibited antioxidant activity (2,2-diphenyl-1-picrylhydrazyl [DPPH]), which increased with increasing ASL content.
KW - Antioxidant activity
KW - Durum wheat starch
KW - Homogeneous starch-lignin blends
KW - Organosolv lignin
KW - Starch-lignin films
UR - http://www.scopus.com/inward/record.url?scp=84929461289&partnerID=8YFLogxK
U2 - 10.1002/star.201500009
DO - 10.1002/star.201500009
M3 - Artículo
SN - 0038-9056
VL - 67
SP - 502
EP - 511
JO - Starch/Staerke
JF - Starch/Staerke
IS - 5-6
ER -