Biomaterial Database

Agro-industrial residue from starch extraction of Pachyrhizus ahipa as filler of thermoplastic corn starch films. 2015

O V López, and F Versino, and M A Villar, and M A García

Planta Piloto de Ingeniería Química, PLAPIQUI (UNS-CONICET), Departamento de Ingeniería Química, UNS, Camino La Carrindanga km 7, 8000 Bahía Blanca, Argentina.

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.

UI	MeSH Term	Description	Entries
D010539	Permeability	Property of membranes and other structures to permit passage of light, heat, gases, liquids, metabolites, and mineral ions.	Permeabilities
D003313	Zea mays	A plant species of the family POACEAE. It is a tall grass grown for its EDIBLE GRAIN, corn, used as food and animal FODDER.	Corn,Indian Corn,Maize,Teosinte,Zea,Corn, Indian
D013213	Starch	Any of a group of polysaccharides of the general formula (C6-H10-O5)n, composed of a long-chain polymer of glucose in the form of amylose and amylopectin. It is the chief storage form of energy reserve (carbohydrates) in plants.	Amylomaize Starch,Amylum,Cornstarch,Keoflo,Starch, Amylomaize
D013227	Steam	Water in its gaseous state. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Water Vapor,Steams,Vapor, Water,Vapors, Water,Water Vapors
D013718	Tensile Strength	The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001)	Strength, Tensile,Strengths, Tensile,Tensile Strengths
D013818	Thermogravimetry	Technique whereby the weight of a sample can be followed over a period of time while its temperature is being changed (usually increased at a constant rate).	Thermogravimetries
D029905	Pachyrhizus	A plant genus of the family FABACEAE. Some Pachyrhizus have been reclassified to PUERARIA. Do not confuse with yam (IPOMOEA; or DIOSCOREA) or African yam bean (SPHENOSTYLIS).	Bean, Yam,Jicama,Pachyrhizus erosus,Pachyrhizus tuberosus,Beans, Yam,Jicamas,Yam Bean,Yam Beans