Crystal structure transformations in extruded starch plasticized with glycerol and urea

Gamarano, Daniel de Souza; Pereira, Iaci Miranda; Silva, Mercês C. da; Mottin, Artur Caron; Ayres, Eliane

doi:10.1007/s00289-019-02999-2

Cited by 34 publications

(31 citation statements)

References 49 publications

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“…Gamarano et al [21] carried out studies on the influence of urea on the starch gelatinization process in the presence of glycerol and the structure of the obtained thermoplastic starch. Research indicates that starch gels more easier in the presence of urea.…”

Section: Introductionmentioning

confidence: 99%

Structural and Thermal Properties of Starch Plasticized with Glycerol/Urea Mixture

et al. 2021

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The paper presents the results of research on the influence of used plasticizing system on the structural and thermal properties of thermoplastic starch (TPS). The thermoplastic starch granulate was obtained by extrusion of native starch in the presence of a plasticizing system using a twin-screw extruder. Glycerol and urea were used as plasticizers in various proportions. In order to evaluate the effectiveness of the starch plasticization process, changes in its chemical structure were analyzed by infrared spectroscopy (FTIR), gel permeation chromatography (GPC) and X-ray diffraction (XRD). TPS thermal stability was determined by thermogravimetric analysis (TGA). An improvement in the efficiency of the plasticization process has been found for a urea-containing plasticizing system compared to the composition of starch plasticized only with glycerol. In addition, the XRD analysis confirms the beneficial effect of urea on the inhibition of starch retrogradation process.

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Section: Introductionmentioning

confidence: 99%

Structural and Thermal Properties of Starch Plasticized with Glycerol/Urea Mixture

et al. 2021

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“…The diffractogram reported in Figure 3 shows that starch, the main component of sweet potato residue, is a semicrystalline polymer. In particular, the presence of the reflections at 15.2°, 17.3°, 17.9°, 22.9° (2θ) is ascribed to the A-type crystalline structure [ 50 , 54 ]. Starch can be classified into three crystalline forms: A, B and C, which is a mixture of A and B-types.…”

Section: Resultsmentioning

confidence: 99%

Integrated Efforts for the Valorization of Sweet Potato By-Products within a Circular Economy Concept: Biocomposites for Packaging Applications Close the Loop

et al. 2021

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With the aim to fully exploit the by-products obtained after the industrial extraction of starch from sweet potatoes, a cascading approach was developed to extract high-value molecules, such as proteins and pectins, and to valorize the solid fraction, rich in starch and fibrous components. This fraction was used to prepare new biocomposites designed for food packaging applications. The sweet potato residue was added to poly(3-hydroxybutyrate-co-3-hydroxyvalerate) in various amounts up to 40 wt % by melt mixing, without any previous treatment. The composites are semicrystalline materials, characterized by thermal stability up to 260 °C. For the composites containing up to 10 wt % of residue, the tensile strength remains over 30 MPa and the strain stays over 3.2%. A homogeneous dispersion of the sweet potato waste into the bio-polymeric matrix was achieved but, despite the presence of hydrogen bond interactions between the components, a poor interfacial adhesion was detected. Considering the significant percentage of sweet potato waste used, the biocomposites obtained show a low economic and environmental impact, resulting in an interesting bio-alternative to the materials commonly used in the packaging industry. Thus, according to the principles of a circular economy, the preparation of the biocomposites closes the loop of the complete valorization of sweet potato products and by-products.

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“…This group of plastics includes materials based on starch blends made from starch modified by thermoplastic processes as well as other biodegradable polymers and polyesters like polylactic acid (PLA) or polyhydroxyalkanoate (PHA) (Barmouz and Behravesh, 2017;Gamarano et al, 2020;Fang and Hanna, 2000;Li et al 2021). Compared to cellulose materials (such as cellulose acetate or regenerate-cellulose), they have only been available on the market for the last few years.…”

Section: Bio-based Biodegradable Plasticsmentioning

confidence: 99%

Foamed bioplastics: a review

Combrzyński¹,

Özmen²

2021

Int. Agrophys.

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A b s t r a c t. Based on a literature review, the development and importance of foamed bioplastics in the context of conventional materials has been discussed in the paper. Raw materials, technological aspects, types of products (including a new generation of bioplastics), their advantages and disadvantages as well as user expectations are presented. Despite considerable progress, especially in the formulation of new raw material compositions, there is still a need to continue research work on the application of different techniques in the production of biodegradable porous packaging materials. It still remains the current primary goal -to produce products with physical characteristics that are comparable with those of petroleum based plastic.K e y w o r d s: physical properties, foams, porous materials, bioplastics, starch-based packaging materials

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Crystal structure transformations in extruded starch plasticized with glycerol and urea

Cited by 34 publications

References 49 publications

Structural and Thermal Properties of Starch Plasticized with Glycerol/Urea Mixture

Structural and Thermal Properties of Starch Plasticized with Glycerol/Urea Mixture

Integrated Efforts for the Valorization of Sweet Potato By-Products within a Circular Economy Concept: Biocomposites for Packaging Applications Close the Loop

Foamed bioplastics: a review

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