Development of materials base on corn flour : evaluation and understanding of the relationships between structures and biodegradation kinetics
type: Dataset
description: In order to develop materials from a cheaper renewable resource than starch, materials based on corn flour were prepared by extrusion and injection. The physicochemical characterization of these materials revealed that the glycerol content (used as plasticizer) and the profiles of shear zones used during extrusion significantly influence the destructuration intensity of starch and proteins of that composed corn flour. This could be established by combining the results of X-ray diffraction analysis, Fourier transform infrared spectroscopy, differential scanning calorimetry, and laser scanning confocal microscopy observations. In addition, the kinetics of the hydrolysis of starch into reducing sugars by amylolytic enzymes in the presence and absence of proteolytic enzymes significantly differed only when the initial structuration of proteins in corn flour was preserved. The materials obtained presented limitations for some applications namely due to their high hygroscopicity and rapid aging over time. The addition of polybutylene succinate (PBS) to flour-glycerol mixture improved mechanical properties and reduced hygroscopicity of the materials. The observation of these materials by scanning electron microscopy showed that corn flour and PBS are incompatible and have a morphology that varies according to the PBS content in the mixture (30, 50 or 70%). The study of the hydrolysis kinetics of starch corn flour by amylolytic enzymes contributed to highlight the influence of several parameters : (i) starch crystallinity, (ii) specific area, (iii) porosity, and (iv) material morphology. In addition, the evaluation of the microbial biodegradation in liquid and solid media aerobically or anaerobically showed the same overall trends as the results obtained by enzymatic hydrolysis. Thus, materials produced from formulations having PBS ratios exceeding 50% are not biodegradable according to the ISO 14855/1999 and are weakly hydrolyzed by amylolytic enzymes.
landing page: https://theses.hal.science/tel-00841383
identifier: NNT: 2011LYO10066
keyword: biodegradation
keyword: cisaillement
keyword: corn-flour
keyword: enzymatic-hydrolysis
keyword: extrusion
keyword: farine-de-mais
keyword: hydrolyse-enzymatique
keyword: infoeu-reposemanticsdoctoralthesis
keyword: polybutylene-succinate
keyword: shear-stress
keyword: spiotherengineering-sciences-physicsother
keyword: theses
issued: 2026-05-10T11:23:57.942457
modified: 2026-05-10T11:23:57.942461
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Development of materials base on corn flour : evaluation and understanding of the relationships between structures and biodegradation kinetics
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00841383
issued: 2026-05-10T11:23:57.945539
modified: 2026-05-10T11:23:57.924607