TY - JOUR
T1 - Extrusion and Characterization of Thermoplastic Starch Sheets from "Macho" Banana
AU - Alanís-López, P.
AU - Pérez-González, J.
AU - Rendón-Villalobos, R.
AU - Jiménez-Pérez, A.
AU - Solorza-Feria, J.
PY - 2011/8
Y1 - 2011/8
N2 - Starch isolated from macho banana was oxidized by using 2.5% and 3.5% (w/w) of sodium hypochlorite. Native and oxidized starches with glycerol were processed using a conical twin screw extruder to obtain thermoplastic laminates or sheets, which were partially characterized. Oxidized banana starches presented higher moisture and total starch but lower ash, protein, lipids, and apparent amylose content than the native starch. Micrographs of sheets from oxidized starches showed wrinkles and cavities presumably caused by the plasticizer, but with less free glycerol and unplasticized starch granules than those from native starch. Sheets from oxidized starch showed a notorious increase in all thermal parameters (To, Tp, and ΔH), mechanical properties (tensile strength, elongation at break, and elasticity), and solubility. Banana starch X-ray diffraction patterns corresponded to a mixture of the A- and B-type polymorphs, with apparently slightly higher crystallinity in oxidized specimens than in native starch. A similar trend was observed in the corresponding sheets.
AB - Starch isolated from macho banana was oxidized by using 2.5% and 3.5% (w/w) of sodium hypochlorite. Native and oxidized starches with glycerol were processed using a conical twin screw extruder to obtain thermoplastic laminates or sheets, which were partially characterized. Oxidized banana starches presented higher moisture and total starch but lower ash, protein, lipids, and apparent amylose content than the native starch. Micrographs of sheets from oxidized starches showed wrinkles and cavities presumably caused by the plasticizer, but with less free glycerol and unplasticized starch granules than those from native starch. Sheets from oxidized starch showed a notorious increase in all thermal parameters (To, Tp, and ΔH), mechanical properties (tensile strength, elongation at break, and elasticity), and solubility. Banana starch X-ray diffraction patterns corresponded to a mixture of the A- and B-type polymorphs, with apparently slightly higher crystallinity in oxidized specimens than in native starch. A similar trend was observed in the corresponding sheets.
KW - Banana starch
KW - Biodegradable sheets
KW - Oxidation
KW - Twin screw extrusion
UR - http://www.scopus.com/inward/record.url?scp=79961128429&partnerID=8YFLogxK
U2 - 10.1111/j.1750-3841.2011.02254.x
DO - 10.1111/j.1750-3841.2011.02254.x
M3 - Artículo
SN - 0022-1147
VL - 76
SP - E465-E471
JO - Journal of Food Science
JF - Journal of Food Science
IS - 6
ER -