Agro-industrial residue from starch extraction of Pachyrhizus ahipa as filler of thermoplastic corn starch films

被引：21
作者：
Lopez, O. V. [1 ]
Versino, F. [2 ]
Villar, M. A. [1 ]
Garcia, M. A. [2 ]
机构：
[1] UNS, Dept Ingn Quim, PLAPIQUI UNS CONICET, Planta Piloto Ingn Quim, RA-8000 Bahia Blanca, Buenos Aires, Argentina
[2] UNLP, Fac Ciencias Exactas, CIDCA UNLP CONICET, Ctr Invest & Desarrollo Criotecnol Alimentos, RA-1900 La Plata, Buenos Aires, Argentina
来源：
CARBOHYDRATE POLYMERS | 2015年 / 134卷
关键词：
Thermoplastic starch; Fibrous residue; Biocomposite films; Structure characterization; Barrier and mechanical properties; WATER-VAPOR BARRIER; NATURAL FIBERS; PLASTICIZED STARCH; CASSAVA STARCH; BIOCOMPOSITES; COMPOSITES; REINFORCEMENT; GELATIN; ROOTS; ACID;
D O I：
10.1016/j.carbpol.2015.07.081
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Biocomposites films based on thermoplastic corn starch (TPS) containing 0.5% w/w fibrous residue from Pachyrhizus ahipa starch extraction (PASR) were obtained by melt-mixing and compression molding. PASR is mainly constituted by remaining cell walls and natural fibers, revealed by Scanning Electron Microscopy (SEM). Chemical composition of the residue indicated that fiber and starch were the principal components. Biocomposites thermo-stability was determined by Thermo-Gravimetric Analysis. A continuous PASR-TPS interface was observed by SEM, as a result of a good adhesion of the fibrous residue to starch matrix. Likewise, films containing PASR presented fewer superficial cracks than TPS ones, whereas their fracture surfaces were more irregular. Besides, the presence of PASR increased starch films roughness, due to fibers agglomerates. Films reinforced with PASR showed significantly lower water vapor permeability (WVP). In addition, PARS filler increased maximum tensile strength and Young's modulus of TPS films, thus leading to more resistant starch matrixes. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：324 / 332
页数：9
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